a327ex.com

EBB UI 1

Summary

Session focused on implementing the HP UI system and emoji display for Emoji Ball Battles.

HP UI System Implementation:

Stencil Buffer Implementation in Engine:

Outline-Only Shader:

Layer Renaming for Clarity:

emoji_particle Class:

Emoji Display:

Cowboy Ball Visual:

Errors and Fixes:

Pending (next session):


Hello, Claude. Let's continue working on Emoji Ball Battles. This session we'll finish the action arena portion of the game by implementing some temporary basic UI and some gameplay mechanics for both weapons and characters. The UI should show each ball's HP at the top, with a big heart emoji and one of the big fonts showing the number for current HP on top of it. I believe some of the games in the refenreces folder contains a system similar to this, at least the heart portion of it. With text similar to the item choice in super emoji box/invaders, we should also have a description of the gameplay effect for each emoji. The gameply effects we'll try first will be something like:

Every hit, the ball holding the dagger has its base spin velocity increased by some amount. This will be dubbed "attack speed" which thus increases with every hit. Every hit, the ball holding the revolver decreases its attack cooldown and spread by some amount. Both cooldown will be higher than it is now, and spread, which is now non-existent, will be added.

Be thorough in researching, find the correct files in case assets are missing, and create a proper plan. Don't implement anything yet. Don't create a new file for the plan, just paste it here.

I'll research the codebase to understand the current state and find relevant reference implementations for the UI and gameplay mechanics.

Task (Research reference implementations)

[
  {
    "type": "text",
    "text": "Perfect! Now let me create a comprehensive report of all the UI patterns I found:\n\n## Report: Heart Emoji HP Display Systems & UI Patterns from Reference Materials\n\nI've found extensive UI pattern references and implementations across the emoji-ball-battles reference games. Here's a comprehensive breakdown:\n\n---\n\n## 1. HEART EMOJI HP DISPLAY SYSTEMS\n\n### **Super Emoji Invaders - Player Health UI**\n**File:** `E:/a327ex/emoji-ball-battles/reference/super-emoji-invaders/src/main.lua` (lines 1431-1466)\n\n```lua\nplayer_health_ui = class:use(transform, timer, hitfx)\nfunction player_health_ui:new(x, y)\n  self:transform(x, y, 0, 22/images.heart.w, 22/images.heart.h)\n  self:timer()\n  self:hitfx()\n  \n  self.emoji = images.heart                    -- Heart emoji as visual\n  self:hitfx_add('hit', 1)                     -- Hit feedback spring\n  self.w, self.h = 100, 6                      -- Bar dimensions\n  self.hp = player.hp\n  self.max_hp = player.max_hp\nend\n\nfunction player_health_ui:update(dt)\n  -- Draw heart emoji with hit spring feedback\n  self.emoji:draw('ui', self.x + 2, self.y, 0, \n    self.sx*self.springs.hit.x, self.sy*self.springs.hit.x, \n    nil, nil, colors.white[0], self.flashes.hit.x and shaders.combine)\n  \n  -- Draw background bar\n  rectangle('ui', self.x + 24 + self.w*0.5, self.y, \n    self.w*self.springs.hit.x, self.h*self.springs.hit.x, \n    2, 2, colors.black[0])\n  \n  -- Draw health fill bar (red)\n  if player.hp > 0 then\n    rectanglel('ui', self.x + 24 + self.w*0.5 - self.w*0.5*self.springs.hit.x, \n      self.y - self.h*0.5*self.springs.hit.x, \n      (self.hp/self.max_hp)*self.w*self.springs.hit.x, \n      self.h*self.springs.hit.x, 2, 2, \n      self.flashes.hit.x and colors.white[0] or colors.red[0])\n  end\n  \n  -- Draw numeric HP text: \"current/max\"\n  print_text_centered('ui_2', tostring(math.floor(self.hp)) .. '/' .. tostring(math.floor(self.max_hp)), \n    fonts.lana, self.x + 2, self.y - 1, 0, self.springs.hit.x, self.springs.hit.x)\nend\n\nfunction player_health_ui:change_hp(hp, max_hp)\n  self.max_hp = max_hp\n  if hp < self.hp then\n    -- Damage: quick tween down\n    self:tween(0.15, self, {hp = hp}, math.linear, function() self.hp = hp end, 'hp')\n  else\n    -- Healing: elastic bounce out with delayed hit effect\n    self:after(0.125, function() self:hitfx_use('hit', 0.25, nil, nil, 0.25) end, 'hp_after')\n    self:tween(0.25, self, {hp = hp}, math.back_out, function() self.hp = hp end, 'hp')\n  end\nend\n```\n\n**Key Features:**\n- Heart emoji + health bar combined display\n- Numeric text showing `current/max` HP\n- Spring feedback on hit (scales with `springs.hit.x`)\n- Flash effect when taking damage (white overlay)\n- Smooth HP transitions: 0.15s on damage, 0.25s on heal (with back_out easing)\n- Bar scales with spring for hit feedback\n\n---\n\n### **Emojunky-One - Heart UI Class**\n**File:** `E:/a327ex/emoji-ball-battles/reference/emojunky-one/ui.lua` (lines 138-150)\n\n```lua\nHeart = Class:extend()\n\nfunction Heart:new(x, y)\n   self.timer = Timer()\n   self.x, self.y = x, y\n   self.w, self.h = 18, 18\n   self.emoji = heart                          -- Heart emoji reference\n   self.sx, self.sy = self.w/self.emoji:getWidth(), self.h/self.emoji:getHeight()\n   self.hit_spring = Spring(1)                 -- Dedicated spring for hit feedback\nend\n\nfunction Heart:update(dt)\n   self.timer:update(dt)\n   self.hit_spring:update(dt)\n   -- [continues with drawing logic]\n```\n\n**Pattern:**\n- Simple standalone heart emoji display with spring system\n- 18x18 pixel size (scaled from emoji dimensions)\n- Single dedicated spring (`hit_spring`) for feedback\n\n---\n\n## 2. EMOJI + STAT DISPLAY PATTERNS (Big Font Stats)\n\n### **Super Emoji Pop - emoji_ui Class**\n**File:** `E:/a327ex/emoji-ball-battles/reference/super-emoji-pop-prototype/src/ui.lua` (lines 34-80)\n\n```lua\nemoji_ui = class:use(transform, timer, hitfx, parent)\nfunction emoji_ui:new(x, y, ui_type)\n  self:transform(x, y)\n  self:timer()\n  self:hitfx()\n\n  self.ui_type = ui_type\n  if self.ui_type == 'attack' then\n    self.emoji = images.swords\n    self.value = player.attack\n  elseif self.ui_type == 'health' then\n    self.emoji = images.heart              -- Heart for health display\n    self.value = player.hp\n  end\n  \n  self.w, self.h = 18, 18                  -- Emoji size\n  self.sx, self.sy = self.w/self.emoji.w, self.h/self.emoji.h\n  self.oy = {0, 0}                         -- Offset array for bounce animation\n  self.characters = {}                     -- Letter images for numeric display\n  self:hitfx_add('hit_1', 1)               -- First spring (emoji)\n  self:hitfx_add('hit_2', 1)               -- Second spring (numbers)\n  self:refresh()\nend\n\nfunction emoji_ui:update(dt)\n  -- Draw emoji with spring feedback\n  self.emoji:draw('ui', self.x, self.y + self.oy[1], 0, \n    self.sx*self.springs.hit_1.x, self.sy*self.springs.hit_2.x)\n  \n  -- Draw numbers to the right with spring feedback\n  push('ui', self.x + 18 + 4 + #self.characters*6, self.y + 1 + self.oy[2], 0, \n    self.springs.hit_2.x, self.springs.hit_2.x)\n    for i, t in ipairs(self.characters) do\n      t:draw('ui', self.x + 18 + 4 + (i-1)*12, self.y + 1 + self.oy[2], 0, 10/72, 10/72)\n    end\n  pop('ui')\nend\n\nfunction emoji_ui:refresh()\n  if self.ui_type == 'attack' then self.value = player.attack\n  elseif self.ui_type == 'health' then self.value = player.hp end\n  \n  local value = tostring(self.value)\n  self.characters = {}\n  \n  -- Convert each digit to letter image\n  for i = 1, #value do \n    table.insert(self.characters, images['letter_' .. value:sub(i, i)]) \n  end\n  \n  -- Bounce animation: offset animates on value change\n  for i = 1, 2 do\n    self:after((i-1)*0.03, function()\n      self.oy[i] = 3                      -- Bounce down\n      self:tween(0.2, self.oy, {[i] = 0}, math.linear, nil, 'oy' .. i)\n    end)\n  end\n  \n  -- Spring feedback\n  self:pull('hit_1', 0.2)                 -- Emoji bounces\n  self:pull('hit_1', 0.1)                 -- Then pull again for emphasis\nend\n```\n\n**Key Pattern: \"Emoji + Big Number Display\"**\n- 18px emoji on left\n- Letter-based numeric display on right (10/72 scale = ~14px text)\n- 4px spacing between emoji and numbers\n- 12px spacing between digits\n- Two springs: one for emoji, one for numbers\n- Bounce animation on value change (oy offset 0\u21923\u21920 over 0.2s)\n- Staggered bounce timing (30ms between animations)\n\n---\n\n### **Super Emoji Invaders - emoji_value_ui Class**\n**File:** `E:/a327ex/emoji-ball-battles/reference/super-emoji-box/ui.lua` (lines 59-112)\n\n```lua\nemoji_value_ui = class:implement(game_object)\nfunction emoji_value_ui:new(args)\n  self:new_game_object(args)\n  self.w, self.h = 18, 18              -- Emoji display size\n  self.sx, self.sy = self.w/self.emoji.w, self.h/self.emoji.h\n  self.oy = {0, 0}                     -- Bounce offsets for emoji and numbers\n  self.characters = {}                 -- Letter image array\n  self.hfx:add('hit_1', 1)            -- Spring 1: emoji scale\n  self.hfx:add('hit_2', 1)            -- Spring 2: number scale\n  self:set_position()\n  self:refresh()\nend\n\nfunction emoji_value_ui:draw()\n  -- Emoji with spring feedback and flash\n  self.emoji:draw(self.ax, self.ay + self.oy[1], 0, \n    self.sx*self.hfx.springs.hit_1.x, self.sy*self.hfx.springs.hit_2.x, \n    nil, nil, self.hfx.flashes.hit_1.x and colors.fg[0], self.hfx.flashes.hit_1.x and shaders.combine)\n  \n  -- Numbers with spring feedback\n  gfx.push(self.ax + 18 + 4 + #self.characters*6, self.ay + 1 + self.oy[2], 0, \n    self.hfx.springs.hit_2.x, self.hfx.springs.hit_2.x)\n    for i, t in ipairs(self.characters) do\n      t:draw(self.ax + 18 + 4 + (i-1)*12, self.ay + 1 + self.oy[2], 0, 10/72, 10/72, \n        nil, nil, self.hfx.flashes.hit_2.x and colors.fg[0], self.hfx.flashes.hit_2.x and shaders.combine)\n    end\n  gfx.pop()\nend\n\nfunction emoji_value_ui:refresh()\n  local value = tostring(run[self.value_string])\n  self.characters = {}\n  \n  for i = 1, #value do \n    table.insert(self.characters, images['letter_' .. value:sub(i, i)]) \n  end\n  \n  -- Staggered bounce animation\n  for i = 1, 2 do\n    self.t:after((i-1)*0.03, function()\n      self.oy[i] = 3\n      self.t:tween(0.2, self.oy, {[i] = 0}, math.linear, nil, 'oy' .. i)\n    end)\n  end\n  \n  self.hfx:use('hit_1', 0.5, nil, nil, 0.15)     -- Spring pull + flash\n  self.hfx:pull('hit_2', 0.5)\n  \n  -- Particle feedback\n  for i = 1, 4 do \n    table.insert(particles, hit_particle{x = self.ax, y = self.ay + self.oy[1], \n      r = random:angle(), v = random:float(100, 150), duration = random:float(0.3, 0.4), \n      color = colors.red[0]}) \n  end\nend\n```\n\n**Variation:** Same emoji + number pattern with particle burst on value change\n\n---\n\n## 3. ITEM/ABILITY DESCRIPTION UI\n\n### **Super Emoji Invaders - Item Selection Box**\n**File:** `E:/a327ex/emoji-ball-battles/reference/super-emoji-invaders/src/main.lua` (lines 125-134, 1469-1528)\n\n```lua\nitem_to_description = {\n  ['fire'] = '[25%](yellow) chance to burn enemies on hit, dealing [3](yellow) damage over 3 seconds',\n  ['chili'] = '[35%](yellow) chance to deal [1](yellow) damage to a nearby enemy on hit',\n  ['melon'] = 'prevents damage taken [once](yellow) every [10](seconds)',\n  ['chocolate'] = '[+1](yellow) damage, [+10](yellow) max health and [full heal](yellow)',\n  ['croissant'] = '[+1](yellow) damage per round',\n  ['hotdog'] = '[+20](yellow) max health',\n  ['coffee'] = '[+15%](yellow) attack speed',\n  ['mushroom'] = 'revive with [1](yellow) health on death',\n}\n\nitem_to_color = {\n  ['fire'] = 'orange',\n  ['chili'] = 'red',\n  ['melon'] = 'green',\n  ['chocolate'] = 'brown',\n  ['croissant'] = 'yellow',\n  ['hotdog'] = 'red',\n  ['coffee'] = 'brown',\n  ['mushroom'] = 'red',\n}\n\n-- UI Box Class\nitem_selection_ui_box = class:use(transform, timer, hitfx, area)\nfunction item_selection_ui_box:new(x, y, emoji)\n  self:transform(x, y, 0, 24/images[emoji].w, 24/images[emoji].h)\n  self:timer()\n  self:hitfx()\n\n  self.emoji_name = emoji\n  self.emoji = images[emoji]\n  self.title = text('[' .. emoji .. '](wavy3)', {font = fonts.fat})\n  self.description = text(item_to_description[emoji], {font = fonts.lana})\n  self:hitfx_add('hover', 1)\n\n  -- Dynamic sizing based on content\n  if (self.title.w + 2*34) >= self.description.w then \n    self.w, self.h = self.title.w + 100, self.title.h + self.description.h + 12\n  else \n    self.w, self.h = self.description.w + 50, self.title.h + self.description.h + 12 \n  end\n  self:area('rectangle', self.w, self.h)\n\n  self.bg_sx, self.bg_sy = 0, 0\nend\n\nfunction item_selection_ui_box:update(dt)\n  local cursor_collision = self:is_colliding_with(cursor)\n  \n  if cursor_collision.enter then\n    self.hot = true\n    self:tween(0.15, self, {bg_sx = 1, bg_sy = 1}, math.cubic_in_out, nil, 'bg_s')\n    self:pull('hover', 0.15)\n    sounds.ui_hover:play(0.7, random:float(0.95, 1.05))\n    sounds.ui_click3:play(0.35, random:float(0.95, 1.05))\n  end\n\n  if cursor_collision.leave then\n    self.hot = false\n    self:tween(0.15, self, {bg_sx = 0, bg_sy = 0}, math.cubic_in_out, nil, 'bg_s')\n  end\n\n  if self.hot and input.action_1.pressed then\n    sounds.ui_click1:play(0.3, random:float(0.95, 1.05))\n    sounds.ui_click2:play(0.6, random:float(0.95, 1.05))\n    self:hitfx_use('hover', 0.5, nil, nil, 0.15)\n    player:add_item(self.emoji_name)\n    self:after(0.15, function()\n      game:remove('item_choice')\n    end)\n  end\n\n  -- Draw background with hover animation\n  push('ui', self.x, self.y, 0, self.springs.hover.x, self.springs.hover.x)\n    if self.hot then\n      rectangle('ui_bg', self.x, self.y, game.w + 40, self.h*self.bg_sy, 0, 0, \n        self.flashes.hover.x and colors.white[0] or colors.yellow[0])\n      texture('ui_bg', function() \n        gfx.rectangle(self.x, self.y, (game.w + 40)*self.springs.hover.x, \n          self.springs.hover.x*self.h*self.bg_sy, 0, 0, colors.fg[0]) \n      end, function()\n        local w, h = self.w*0.5, 0.5*self.h*self.bg_sy\n        gfx.push(self.x, self.y, 0, self.bg_sx)\n          gfx.polygon({self.x - w - 25, self.y - h, self.x + w, self.y - h, \n            self.x + w + 25, self.y + h, self.x - w, self.y + h}, \n            self.flashes.hover.x and colors.white[-1] or colors.yellow[-3])\n        gfx.pop()\n      end)\n    end\n    \n    -- Animate emojis on sides with sine wave bob\n    self.emoji:draw('ui', self.x - self.title.w/2 - 20, \n      self.y - 10 + 1.25*math.sin(4*game.time), 0, self.sx, self.sy)\n    self.emoji:draw('ui', self.x + self.title.w/2 + 18, \n      self.y - 10 + 1.25*math.sin(4*game.time + #self.title.characters), 0, -self.sx, self.sy)\n    \n    -- Draw title and description\n    self.title:update('ui', dt, self.x, self.y - 4)\n    self.description:update('ui', dt, self.x, self.y + 14)\n  pop('ui')\nend\n```\n\n**Key Features:**\n- **Markup in descriptions:** `[text](color)` format for colored highlights\n- **Text parsing:** Font system with `fonts.fat` for titles, `fonts.lana` for descriptions\n- **Dynamic sizing:** Box grows to fit content\n- **Hover animation:** Background scales up with spring (0\u21921 scale)\n- **Emoji animation:** Side emojis bob with `1.25*sin(4*time)` motion\n- **Color matching:** `item_to_color` maps items to theme colors\n- **Sound feedback:** Hover and click sounds with pitch variation (0.95-1.05)\n\n---\n\n## 4. EMOJI STATS WITH BOUNCING TEXT EFFECT\n\n### **Emojunky-One UI Pattern**\n**File:** `E:/a327ex/emoji-ball-battles/reference/emojunky-one/ui.lua` (lines 52-93)\n\n```lua\nBoxUI = Class:extend()\n\nfunction BoxUI:new(player)\n   self.timer = Timer()\n   self.emoji = gift                         -- Box emoji\n   self.w, self.h = 18, 18                   -- Fixed size\n   self.sx, self.sy = self.w/self.emoji:getWidth(), self.h/self.emoji:getHeight()\n   self.hit_spring = Spring(1)\n   self.hit_spring_2 = Spring(1)\n   self.player = player\n   self.oys = {0, 0}                         -- Bounce offsets\n   self.ts = {}                              -- Letter image array\n   self:refresh()\nend\n\nfunction BoxUI:draw()\n   -- Emoji with spring feedback\n   draw_image(self.emoji, self.x, self.y + self.oys[1], 0, \n     self.sx*self.hit_spring.x, self.sy*self.hit_spring.x)\n   \n   -- Numbers with spring feedback and push/pop scaling\n   push(self.x + 18 + 4 + #self.ts*6, self.y + 1 + self.oys[2], 0, \n     self.hit_spring_2.x, self.hit_spring_2.x)\n      for i, t in ipairs(self.ts) do \n        draw_image(t, self.x + 18 + 4 + (i-1)*12, self.y + 1 + self.oys[2], 0, 10/72, 10/72) \n      end\n   pop()\nend\n\nfunction BoxUI:refresh()\n   self.boxes = tostring(self.player.boxes)\n   self.ts = {}\n   for i = 1, #self.boxes do \n     table.insert(self.ts, _G[\"letter_\" .. self.boxes:sub(i, i)]) \n   end\n   \n   for i = 1, 2 do\n      self.timer:after((i-1)*0.03, function()\n         self.oys[i] = 3                    -- Bounce down by 3px\n         self.timer:tween(0.2, self.oys, {[i] = 0}, linear, nil, \"oy\" .. i)\n      end)\n   end\n   self.hit_spring:pull(0.2)                -- Spring for emoji\n   self.hit_spring_2:pull(0.1)              -- Spring for numbers\nend\n```\n\n**Layout Pattern:**\n```\n[Emoji 18px] [4px gap] [Digit] [Digit] [Digit]...\n  centered      \u2192      12px each digit\n  bounce: oy[1]        bounce: oy[2]\n  spring: 0.2          spring: 0.1\n```\n\n---\n\n## 5. ADDITIONAL UI PATTERNS FROM EFFECTS DOCUMENTATION\n\n**File:** `E:/a327ex/emoji-ball-battles/reference/emoji_effects_documentation.md`\n\n### **Damage Number Float (InfoText Pattern)**\n- **Position:** Spawns above target, drifts upward at 24 units/second\n- **Character rotation:** Each character has random rotation \u00b1\u03c0/16, oscillates with angular speed \u00b1\u03c0/4\n- **Vertical bob:** Characters bob vertically using `4*sin(time + index)`\n- **Duration:** Visible for 0.5\u00d7 multiplier, then scale tweens to 0 over 1\u00d7 multiplier\n- **Scale:** Characters scale with parent spring\n- **Size:** `10/72` scale for letter images = ~14px text\n\n### **HP Bar (Temporary)**\n- **Position:** Floats above entity, offset by configurable Y\n- **Size:** Scales with entity's spring value\n- **Fill:** Width proportional to current/max HP\n- **Color:** Red fill, black background; turns white when entity flashing\n- **Duration:** Disappears after 1-2 seconds\n\n### **Timer UI Pattern** (Super Emoji Pop)\n- Emoji + digit display format\n- Real-time stat updates\n- Letter-based numeric rendering\n\n---\n\n## 6. ASSET/FONT REFERENCES\n\n**Fonts Used:**\n- `fonts.fat` - Big, bold text for titles\n- `fonts.lana` - Regular text for descriptions/stats\n- Default scale: `10/72` for readable digit/letter size\n\n**Emoji References:**\n- `images.heart` - HP display\n- `images.swords` - Attack stat\n- `images.gift` - Box counter\n- `images.dollar` - Money counter\n- `images.smiling_imp` - Timer display\n\n**Color System:**\n- `colors.red[0]` - HP bars, damage numbers\n- `colors.yellow[0]` - Highlights, hover states\n- `colors.white[0]` - Flash effects\n- `colors.black[0]` - Backgrounds\n- Various theme colors for items (orange, green, brown, etc.)\n\n---\n\n## 7. KEY IMPLEMENTATION PATTERNS SUMMARY\n\n| Pattern | Scale | Spacing | Animation |\n|---------|-------|---------|-----------|\n| **Emoji + Stat** | 18px emoji | 4px gap | Spring pull 0.1-0.2 |\n| **Big Number** | 10/72 scale | 12px between | Bounce 3px, 0.2s |\n| **HP Bar** | Variable width | N/A | Spring multiplier |\n| **Damage Text** | 10/72 scale | Variable | Float up 24 u/s |\n| **Item Box** | Dynamic size | Variable | Hover scale 0\u21921 |\n\nThis comprehensive reference covers all the major UI patterns from Super Emoji Invaders, Super Emoji Box, Super Emoji Pop, and Emojunky-One implementations."
  },
  {
    "type": "text",
    "text": "agentId: a519cdf (for resuming to continue this agent's work if needed)"
  }
]

Now I have a comprehensive understanding. Let me also check for the heart emoji asset and examine the current weapon/ball implementation more closely.

Glob (*/heart.png)

E:\a327ex\emoji-ball-battles\reference\emojunky-one\res\heart.png
E:\a327ex\emoji-ball-battles\reference\emojunky-one\res\heart_piece_left.png
E:\a327ex\emoji-ball-battles\reference\emojunky-one\res\heart_piece_right.png
E:\a327ex\emoji-ball-battles\reference\super-emoji-box\assets\images\heart.png
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\assets\images\heart.png
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\images\heart.png
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\assets\images\heart.png

Let me check the available fonts in emoji-ball-battles and look at the damage_number class for reference.

Glob (*/.ttf)

E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\assets\fonts\editundo.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\editundo.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-box\assets\fonts\APL386.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-box\assets\fonts\FatPixelFont.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\assets\fonts\FatPixelFont.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\FatPixelFont.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\assets\fonts\FatPixelFont.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-box\assets\fonts\LanaPixel.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-box\assets\fonts\PixulBrush-Mono.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\assets\fonts\LanaPixel.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\assets\fonts\PixulBrush-Mono.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\LanaPixel.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\PixulBrush-Mono.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\assets\fonts\LanaPixel.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\assets\fonts\PixulBrush-Mono.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-box\assets\fonts\PixulBrush.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\assets\fonts\PixulBrush.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\PixulBrush.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\assets\fonts\PixulBrush.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\assets\fonts\ark.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\ark.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\assets\fonts\ark.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\assets\fonts\fusion-pixel.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\fusion-pixel.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\assets\fonts\fusion-pixel.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\m5x7.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\monogram-extended.ttf
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\assets\fonts\Silver.ttf
E:\a327ex\emoji-ball-battles\assets\LanaPixel.ttf
E:\a327ex\emoji-ball-battles\reference\super emoji box\assets\LanaPixel.ttf
... [22 more lines]

Grep (class damage_number)

E:\a327ex\emoji-ball-battles\main.yue:1502:class damage_number extends object
E:\a327ex\emoji-ball-battles\main.yue-1503-  new: (@x, @y, amount, args={}) =>
E:\a327ex\emoji-ball-battles\main.yue-1504-    super!
E:\a327ex\emoji-ball-battles\main.yue-1505-    @vy = args.vy or -24
E:\a327ex\emoji-ball-battles\main.yue-1506-    @duration_multiplier = args.duration_multiplier or 1
E:\a327ex\emoji-ball-battles\main.yue-1507-    @scale = 12/512
E:\a327ex\emoji-ball-battles\main.yue-1508-    @\add spring!
E:\a327ex\emoji-ball-battles\main.yue-1509-    @spring\pull 'main', 0.5, 3, 0.7
E:\a327ex\emoji-ball-battles\main.yue-1510-
E:\a327ex\emoji-ball-battles\main.yue-1511-    -- Create character data for each digit
E:\a327ex\emoji-ball-battles\main.yue-1512-    @characters = {}
E:\a327ex\emoji-ball-battles\main.yue-1513-    text = tostring amount
E:\a327ex\emoji-ball-battles\main.yue-1514-    for i = 1, #text
E:\a327ex\emoji-ball-battles\main.yue-1515-      digit = text\sub i, i
E:\a327ex\emoji-ball-battles\main.yue-1516-      @characters[] = {
E:\a327ex\emoji-ball-battles\main.yue-1517-        image: an.images[digit]
E:\a327ex\emoji-ball-battles\main.yue-1518-        rotation: an.random\float -math.pi/16, math.pi/16
E:\a327ex\emoji-ball-battles\main.yue-1519-        angular_speed: an.random\float -math.pi/4, math.pi/4
E:\a327ex\emoji-ball-battles\main.yue-1520-        offset_y: 0
E:\a327ex\emoji-ball-battles\main.yue-1521-      }
E:\a327ex\emoji-ball-battles\main.yue-1522-
E:\a327ex\emoji-ball-battles\main.yue-1523-    @\add timer!
E:\a327ex\emoji-ball-battles\main.yue-1524-    @timer\after 0.25*@duration_multiplier, ->
E:\a327ex\emoji-ball-battles\main.yue-1525-      @timer\tween 0.75*@duration_multiplier, @, {scale: 0}, math.cubic_in_out, -> @\kill!
E:\a327ex\emoji-ball-battles\main.yue-1526-
E:\a327ex\emoji-ball-battles\main.yue-1527-  update: (dt) =>
E:\a327ex\emoji-ball-battles\main.yue-1528-    -- Update character wobble
E:\a327ex\emoji-ball-battles\main.yue-1529-    for i, character in ipairs @characters
E:\a327ex\emoji-ball-battles\main.yue-1530-      character.rotation += character.angular_speed*dt
E:\a327ex\emoji-ball-battles\main.yue-1531-      character.offset_y = 4*math.sin(an.time + i)
... [51 more lines]

Let me check how assets are loaded to understand the image loading pattern.

Read (E:/a327ex/emoji-ball-battles/main.yue)

1→global *
     2→
     3→require('anchor')
     4→  width: 480
     5→  height: 270
     6→  scale: 3
     7→
     8→-- Game dimensions
     9→gw, gh = an.width, an.height
    10→
    11→-- Twitter emoji color palette
    12→white = color 255, 255, 255
    13→black = color 0, 0, 0
    14→gray = color 128, 128, 128
    15→bg_color = color 48, 49, 50
    16→fg = color 231, 232, 233
    17→fg_dark = color 201, 202, 203
    18→yellow = color 253, 205, 86
    19→star_yellow = color 255, 172, 51
    20→orange = color 244, 146, 0
    21→blue = color 83, 175, 239
    22→green = color 122, 179, 87
    23→red = color 223, 37, 64
    24→purple = color 172, 144, 216
    25→brown = color 195, 105, 77
    26→wall_color = fg\clone!\mix yellow, 0.1
    27→
    28→-- Sky colors (subtle blue gradient)
    29→sky_top = color 135, 206, 235     -- light sky blue
    30→sky_bottom = color 231, 232, 233  -- same as fg (off-white)
... [190 more lines]

Let me check the Anchor framework for font/text support.

Grep (font|text|print)

46:an\font(name, path, size)
206:layer\text(text, font_name, x, y, color)
232:layer\get_texture() -> texture_id
240:image.handle -> texture_handle
243:## Font
246:font.name -> string
247:font.size -> number
248:font.height -> number
249:font\text_width(text) -> number
250:font\char_width(codepoint) -> number
251:font\glyph_metrics(codepoint) -> {width, height, advance, bearingX, bearingY}

Now I have all the information needed. Here's the comprehensive plan:


Implementation Plan: Battle UI + Weapon Mechanics

Overview

We're implementing:

  1. HP UI at top of screen - heart emoji + big font HP number for each ball
  2. Weapon effect descriptions - text explaining each weapon's passive
  3. Dagger mechanic - every hit increases base spin velocity ("attack speed")
  4. Revolver mechanic - every hit decreases cooldown and spread (both start higher)

Part 1: Assets

Missing asset: heart.png

The heart emoji doesn't exist in emoji-ball-battles/assets/. We need to copy it from one of the reference games:

Font loading

The game has fonts in assets but doesn't load them yet. We need to add font loading in the initialization section (around line 91): yuescript an\font 'fat', 'assets/FatPixelFont.ttf', 16 -- big font for HP numbers an\font 'lana', 'assets/LanaPixel.ttf', 10 -- smaller font for descriptions


Part 2: UI Implementation

2.1 Add image and font loading (after line 87)

an\image 'heart', 'assets/heart.png'
an\font 'fat', 'assets/FatPixelFont.ttf', 16
an\font 'lana', 'assets/LanaPixel.ttf', 10

2.2 Create ball_hp_ui class

Based on the reference pattern from super-emoji-invaders (player_health_ui), this class will:

Layout per ball: [❤️ 22px] [HP: 100] (big font) [Weapon description text] (small font)

Position:

Key properties to track:

2.3 Create battle_ui class

Container class added to arena that creates two ball_hp_ui instances:

The arena will create this after spawning the balls (around line 285 in arena's new method).

2.4 Weapon descriptions

Using a pattern similar to item_to_description from super-emoji-invaders: yuescript weapon_descriptions = { dagger: "Attack speed increases with each hit" gun: "Cooldown and spread decrease with each hit" }

These will be drawn below each HP display using the smaller LanaPixel font.


Part 3: Dagger Mechanic - Attack Speed Stacking

Concept: Each successful hit with the dagger increases the ball's @base_angular_velocity, making subsequent swings faster.

3.1 Add tracking properties to ball class (around line 1020)

For dagger-wielding balls: yuescript @attack_speed_bonus = 0 -- stacking bonus from hits @attack_speed_per_hit = 0.15*math.pi -- bonus per hit (~0.47 rad/s, so ~10 hits to double) @max_attack_speed_bonus = 3*math.pi -- cap at doubling base speed

3.2 Modify the angular velocity guardrails (around line 1075)

Currently compares against @base_angular_velocity. We need to compute an effective base: yuescript effective_base = @base_angular_velocity + @attack_speed_bonus

Use effective_base instead of @base_angular_velocity in the guardrail calculations.

3.3 Add method to increase attack speed (new method in ball class)

increase_attack_speed: =>
  if @weapon_class == 'melee'
    @attack_speed_bonus = math.min(@attack_speed_bonus + @attack_speed_per_hit, @max_attack_speed_bonus)

3.4 Call on hit (in weapon_hitbox-ball collision handler, around line 560)

When dagger deals damage, call attacker\increase_attack_speed! on the ball that owns the weapon.


Part 4: Revolver Mechanic - Cooldown and Spread Reduction

Concept: The revolver starts with higher cooldown and spread. Each hit reduces both.

4.1 Add tracking properties to ball class (around line 1062)

For gun-wielding balls: yuescript -- Current values @gun_cooldown = 1.2 -- starts high (was 0.6) @gun_spread = math.pi/6 -- starts with spread (30° cone) -- Reduction per hit @cooldown_reduction_per_hit = 0.05 -- 5% reduction per hit @spread_reduction_per_hit = 0.05 -- 5% reduction per hit -- Minimums @min_gun_cooldown = 0.4 @min_gun_spread = 0.02 -- nearly zero but not quite

4.2 Modify gun_fire method (around line 1205)

Change the cooldown timer from hardcoded 0.6 to use @gun_cooldown: yuescript @timer\after @gun_cooldown, 'gun_cooldown', -> @gun_ready = true

Add spread to projectile direction: yuescript spread_offset = an.random\float(-@gun_spread, @gun_spread) direction: @angle + spread_offset

4.3 Add method to improve gun stats (new method in ball class)

improve_gun_stats: =>
  if @weapon_class == 'ranged'
    @gun_cooldown = math.max(@gun_cooldown * (1 - @cooldown_reduction_per_hit), @min_gun_cooldown)
    @gun_spread = math.max(@gun_spread * (1 - @spread_reduction_per_hit), @min_gun_spread)

4.4 Call on hit (in projectile-ball collision handler, around line 620)

When projectile deals damage, call projectile.owner\improve_gun_stats! (we'll need to store the owner ball reference, not just owner_id).


Part 5: File Changes Summary

main.yue modifications:

Location Change
Line ~72 Add an\image 'heart', 'assets/heart.png'
Line ~91 Add font loading for 'fat' and 'lana'
Line ~285 Add @battle_ui = battle_ui @player, @enemy in arena
Line ~560 Call increase_attack_speed on dagger hit
Line ~620 Call improve_gun_stats on projectile hit
Line ~980 Add attack speed properties for dagger balls
Line ~1062 Add cooldown/spread properties for gun balls
Line ~1075 Modify guardrails to use effective_base
Line ~1207 Use @gun_cooldown instead of 0.6
Line ~1229 Add spread offset to projectile direction
After line ~1280 Add ball_hp_ui class (~60 lines)
After ball_hp_ui Add battle_ui class (~20 lines)
Ball class Add increase_attack_speed method (~5 lines)
Ball class Add improve_gun_stats method (~5 lines)

New file:


Part 6: Estimated UI Layout

Screen (480x270):

  [❤️] 100                                    [❤️] 100
  Attack speed ↑ on hit           Cooldown & spread ↓ on hit

                    +-----------------+
                    |                 |
                    |     ARENA       |
                    |    (200x200)    |
                    |                 |
                    +-----------------+

Player HP at ~(40, 16), Enemy HP at ~(440, 16), both centered on their respective sides.


Part 7: Implementation Order

  1. Copy heart.png asset
  2. Add image/font loading to main.yue
  3. Create ball_hp_ui class with heart + number display
  4. Create battle_ui class to manage both HP displays
  5. Integrate battle_ui into arena class
  6. Add dagger attack speed properties to ball class
  7. Modify angular velocity guardrails to use effective base
  8. Add increase_attack_speed method and call on dagger hit
  9. Add gun cooldown/spread properties to ball class
  10. Modify gun_fire to use dynamic cooldown and spread
  11. Add improve_gun_stats method and call on projectile hit
  12. Add weapon description text to ball_hp_ui

Questions Before Implementation

  1. HP display format: Should it show just the number (e.g., "100") or current/max (e.g., "100/100")? The reference games do both.

  2. Weapon description styling: Should descriptions be colored (e.g., yellow highlights for key words like "attack speed") or plain text?

  3. Attack speed bonus visual feedback: Should there be any visual indicator when attack speed increases (flash, particles, sound)?

  4. Starting values for gun: I proposed cooldown 1.2s (was 0.6s) and spread π/6 (30°). Do these feel right, or would you prefer different starting points?

  5. Reduction rates: I proposed 5% reduction per hit for both cooldown and spread. The minimums are 0.4s cooldown and near-zero spread. Reasonable starting points?

OK, there are a few mistakes but we'll correct those before implementing each part. Let's go part by part (1 through 12). Before implementing it, tell me what you'll do, I'll correct you if needed and answer any questions.

Sounds good. Let's start with Part 1: Copy heart.png asset.

What I'll do:

Copy the heart emoji image from the Super Emoji Invaders reference folder to the emoji-ball-battles assets folder:

This is a 512x512 Twitter-style heart emoji that will be scaled down for the UI display.

Is this correct, or should I use a different source file?

Yes, this is correct.

Bash (cp "E:/a327ex/emoji-ball-battles/reference/super-emoji-invaders/src/assets/image...)

Done. The heart.png is now in the assets folder.


Part 2: Add image/font loading

What I'll do:

Add these lines to main.yue after the digit image loading (around line 88):

an\image 'heart', 'assets/heart.png'
an\font 'fat', 'assets/FatPixelFont.ttf', 16
an\font 'lana', 'assets/LanaPixel.ttf', 10

This will:

Is this correct? Any adjustments to font sizes or font choices?

lana should be 11, check if fat is that size in reference games too (multiple games use it)

Grep (FatPixelFont|font.*fat)

E:\a327ex\emoji-ball-battles\reference\super-emoji-box\ui.lua:34:  self.text = simple_text{x = self.x, y = self.y, text = '[wavy4, ' .. self.text_tag_color .. ']' .. self.text, font = fonts.fat}
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\main.lua:1477:  self.title = text('[' .. emoji .. '](wavy3)', {font = fonts.fat})
E:\a327ex\emoji-ball-battles\reference\super-emoji-pairs\src\engine\font.lua:20:  fonts.fat = font('FatPixelFont.ttf', 8)
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\ui.lua:91:  self.title = text('[' .. emoji .. '](wavy3)', {font = fonts.fat})
E:\a327ex\emoji-ball-battles\reference\super-emoji-pop-prototype\src\engine\font.lua:15:  fonts.fat = font('FatPixelFont.ttf', 8)
E:\a327ex\emoji-ball-battles\reference\super-emoji-box\engine\init.lua:114:  fonts.fat = font('FatPixelFont', 8)
E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\engine\font.lua:17:  fonts.fat = font('FatPixelFont.ttf', 8)

The reference games all use FatPixelFont at size 8, not 16.

Updated plan:

an\image 'heart', 'assets/heart.png'
an\font 'fat', 'assets/FatPixelFont.ttf', 8
an\font 'lana', 'assets/LanaPixel.ttf', 11

Is this correct now?

Yes.

Read (E:/a327ex/emoji-ball-battles/main.yue)

85→-- Digit images for damage numbers
    86→for i = 0, 9
    87→  an\image tostring(i), "assets/#{i}.png"
    88→
    89→-- Spritesheets
    90→an\spritesheet 'hit1', 'assets/hit1.png', 96, 48
    91→
    92→-- Sounds
    93→-- Normalized volumes (baseline -24 dB, 0.5 base volume):
    94→--   ball_ball (suicchi_wo_osu): -16.7 dB → 0.22

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Done. Heart image and fonts are now loaded.


Part 3: Create ball_hp_ui class

What I'll do:

Create a class that displays one ball's HP with:

Based on the reference pattern, the layout would be: [❤️ 22px] [4px gap] [HP number]

The class will:

I'll place this class after the hp_bar class (around line 1290) since it's also UI-related.

Questions:

  1. Should the HP number just show current HP (e.g., "87") or current/max (e.g., "87/100")?
  2. Should the heart and number scale together with the spring, or just bounce vertically?

Don't have any vertical bounce, have the text be in front of the heart, centered on it. When the refresh happens, both bounce the same, actually, we might try different bounces for text and heart to give it a slightly different effect. Regardless, because heart will be outside the arena on top of the one of the walls, it should just be in a layer that's in front of the walls, and then the text should be in a layer that's on top of the heart. They don't need to be in the UI layer, in fact, they shouldn't, since I want them to also move with the camera. There's no need for now to do any special effect on the text or any tweens, refresh just passes the new HP and the text becomes that.

Got it, much clearer now. Let me revise:

Updated design:

Question about layers:

Looking at the current layer stack, walls are drawn on game and front_2. The layers after that are:

Should I:

  1. Use existing layers (e.g., front_3 for heart, effects for text)?
  2. Create new dedicated layers for the HP UI?

Which approach do you prefer?

Yea, those two layers are fine.

Part 3: Create ball_hp_ui class

What I'll do:

Create a class with:

class ball_hp_ui extends object
  new: (@x, @y, @ball) =>
    super!
    @hp = @ball.hp
    @heart_scale = 22/512

    @\add spring!
    @spring\add 'heart', 1
    @spring\add 'text', 1

  refresh: (hp) =>
    @hp = hp
    @spring\pull 'heart', 0.3, 3, 0.7
    @spring\pull 'text', 0.2, 3, 0.5  -- slightly different timing

  update: (dt) =>
    -- Draw heart on front_3
    front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
    front_3\image an.images.heart, 0, 0
    front_3\pop!

    -- Draw text on effects (centered on heart)
    effects\text tostring(@hp), 'fat', @x, @y, white!

I'll place this after the hp_bar class. Does this look right? Any adjustments to spring values, scale, or text color?

Create this as an inline object in ball, due to the @\add function it becomes a child, so there's no need for reference function. On the constructor, where it hasn't been added yet, it can use the @hp value from the above scope in ball's constructor. You can see examples of inline objects when the clouds are created in arena, for reference.

Grep (cloud)

82:an\image 'cloud', 'assets/cloud.png'
83-an\image 'sun', 'assets/sun.png'
84-
85--- Digit images for damage numbers
86-for i = 0, 9
87-  an\image tostring(i), "assets/#{i}.png"
88-
89--- UI images
90-an\image 'heart', 'assets/heart.png'
91-
92--- Fonts
93-an\font 'fat', 'assets/FatPixelFont.ttf', 8
94-an\font 'lana', 'assets/LanaPixel.ttf', 11
95-
96--- Spritesheets
97-an\spritesheet 'hit1', 'assets/hit1.png', 96, 48
98-
99--- Sounds
100--- Normalized volumes (baseline -24 dB, 0.5 base volume):
101---   ball_ball (suicchi_wo_osu): -16.7 dB → 0.22
102---   ball_wall: -21.2 dB → 0.36
--
276:    cloud_image = an.images.cloud
277:    cloud_base_scale = 24/cloud_image.width
278:    cloud_speed = 5
279:    cloud_min_spacing = 45
280:    cloud_alpha = math.floor(an.random\float(0.5, 0.6) * 255)
281-
282-    -- Cloud area (arena + buffer, top portion only)
283:    cloud_area_x = @x - 30
... [110 more lines]

I see the pattern. Let me revise:

What I'll do:

Create the HP UI as an inline object in the ball's constructor (after the hp_bar is added, around line 1058), similar to how clouds are created:

-- HP UI (heart + number display at top of screen)
hp_ui_x = if @team == 'player' then 80 else 400  -- position TBD
hp_ui_y = 20
hp = @hp  -- capture from ball's scope

hp_ui = object!
hp_ui\add spring!
hp_ui.spring\add 'heart', 1
hp_ui.spring\add 'text', 1
hp_ui\set {
  x: hp_ui_x
  y: hp_ui_y
  hp: hp
  heart_scale: 22/512
  refresh: (new_hp) =>
    @hp = new_hp
    @spring\pull 'heart', 0.3, 3, 0.7
    @spring\pull 'text', 0.2, 3, 0.5
}
hp_ui\action (dt) =>
  -- Heart on front_3
  front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  front_3\image an.images.heart, 0, 0
  front_3\pop!
  -- Text on effects
  effects\text tostring(@hp), 'fat', @x, @y, white!

hp_ui\flow_to @
@hp_ui = hp_ui  -- store reference so ball can call refresh

Then in take_damage, after updating @hp, call @hp_ui\refresh @hp.

Questions:

  1. What positions should I use for player and enemy HP displays? I guessed (80, 20) and (400, 20) but these should probably be relative to the arena walls.
  2. Is the structure above correct for the inline object pattern?

object! should be object 'hp_ui' otherwise we won't be able to refer to it as @hp_ui in take_damage. This also removes the need to manually do @hp_ui = hp_ui, that happens automatically in flow_to if the child object is named. Other than that it does look correct. Your guessed positions for now are fine, just calculate them in terms of gw, which is the screen's size.

Got it. Let me read the exact location where I'll add this.

Read (E:/a327ex/emoji-ball-battles/main.yue)

1048→    @spring\add 'squash_y', 1
  1049→
  1050→    -- Flash state for weapon
  1051→    @weapon_flashing = false
  1052→    @weapon_recoil = 0  -- rotation offset for gun recoil animation
  1053→    @weapon_recoil_offset = 0  -- position offset for gun recoil (moves toward ball)
  1054→
  1055→    -- HP
  1056→    @max_hp = 100
  1057→    @hp = @max_hp
  1058→    @\add hp_bar!
  1059→
  1060→    -- Start ball movement after 3 seconds
  1061→    @\add timer!
  1062→    @collider\set_gravity_scale 0
  1063→    @timer\after 3, ->
  1064→      @collider\set_gravity_scale 1
  1065→      @collider\apply_impulse an.random\sign!*an.random\float(5, 10), an.random\float(-10, 10)
  1066→      @collider\set_angular_velocity @base_angular_velocity
  1067→
  1068→    -- Gun auto-firing: when aligned and ready, fire
  1069→    if @weapon_type == 'gun'
  1070→      @gun_ready = true
  1071→      @timer\when (-> @gun_ready and @\gun_is_aligned!), 'gun_fire', (-> @\gun_fire!)
  1072→
  1073→  update: (dt) =>
  1074→    -- Read angle from physics
  1075→    @angle = @collider\get_angle!
  1076→
  1077→    -- Angular velocity guardrails

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The user doesn't want to proceed with this tool use. The tool use was rejected (eg. if it was a file edit, the new_string was NOT written to the file). To tell you how to proceed, the user said:
you can remove the 3 lines at the top and make them inline in set, since they're only used there. You also forget to do the text spring on the text.

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Now I need to update take_damage to call the refresh. Let me find that method.

Read (E:/a327ex/emoji-ball-battles/main.yue)

1175→    -- Draw weapon at offset, rotated with ball (recoil_offset pulls gun toward ball)
  1176→    -- Gun is offset 2 pixels "up" (perpendicular to angle, counterclockwise)
  1177→    actual_offset = @weapon_visual_offset - @weapon_recoil_offset
  1178→    perp_angle = @angle - math.pi/2
  1179→    weapon_x = @x + actual_offset*math.cos(@angle) + 2*math.cos(perp_angle)
  1180→    weapon_y = @y + actual_offset*math.sin(@angle) + 2*math.sin(perp_angle)
  1181→    weapon_spring = @spring.weapon.x
  1182→    front_3\push weapon_x, weapon_y, @angle + @weapon_rotation_offset + @weapon_recoil, @weapon_scale*weapon_spring, @weapon_scale_y*weapon_spring
  1183→    front_3\image @weapon_image, 0, 0, nil, @weapon_flashing and white!
  1184→    front_3\pop!
  1185→
  1186→  take_damage: (amount, source) =>
  1187→    return unless @parent  -- Guard against events before fully added
  1188→    @hp -= amount
  1189→    @spring\pull 'hit', 0.3, 3, 0.7
  1190→    @\flash_ball!
  1191→
  1192→    -- Sound
  1193→    an\sound_play 'dagger_ball', 0.88, an.random\float(0.95, 1.05)
  1194→    -- if @team == 'player'
  1195→    --   an\sound_play 'player_hit', 0.5, an.random\float(0.95, 1.05)
  1196→
  1197→    -- Spawn damage number above
  1198→    @parent\add damage_number @x, @y - @radius - 10, amount, {duration_multiplier: 0.5}
  1199→
  1200→    -- Show HP bar
  1201→    @hp_bar\activate!
  1202→
  1203→    -- Camera shake when player takes damage
  1204→    if @team == 'player'

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Done. The ball_hp_ui is now created as an inline object and refreshes on damage.


Part 4: Create battle_ui class

Looking back at the plan, this was meant to be a container class to manage both HP displays. However, since we just integrated the HP UI directly into each ball as a child object, we no longer need a separate battle_ui class - each ball manages its own HP display.

Should we skip this part, or is there something else you'd like a battle_ui class to handle?

Draw position should be slightly below and to the right/left respectively. Text is not drawing centered on the heart, likely due to the text function not being centered, read docs to be sure.

Read (E:/a327ex/Anchor/docs/FRAMEWORK_API.md)

1→# Framework API
     2→
     3→Complete documentation for YueScript framework classes. For quick reference signatures, see `FRAMEWORK_API_QUICK.md`.
     4→
     5→---
     6→
     7→## Initialization
     8→
     9→The Anchor framework is initialized by requiring it with a configuration table:
    10→
    11→```yuescript
    12→require('anchor')
    13→  width: 640
    14→  height: 360
    15→  title: "My Game"
    16→  scale: 2
    17→  vsync: true
    18→  fullscreen: false
    19→  resizable: true
    20→  filter: "rough"
    21→```
    22→
    23→### Configuration Options
    24→
    25→| Option | Type | Default | Description |
    26→|--------|------|---------|-------------|
    27→| `width` | int | 480 | Game resolution width |
    28→| `height` | int | 270 | Game resolution height |
    29→| `title` | string | "Anchor" | Window title |
    30→| `scale` | int | 3 | Initial window scale multiplier |
... [70 more lines]

Grep (layer\text|text.*font|centered)

129-
130--- Access later
131:layer\text "Score: 100", 'main', 10, 10, white!
132-```
133-
134-Fonts are stored in `an.fonts.name`.
135-
136----
137-
138-#### an\shader(name, path)
139-
140-Loads and registers a fragment shader.
141-
142-```yuescript
143-an\shader 'blur', 'shaders/blur.frag'
144-an\shader 'outline', 'shaders/outline.frag'
145-
146--- Access later
147-layer\apply_shader an.shaders.blur
148-```
149-
150-Shaders are stored in `an.shaders.name`.
151-
--
990----
991-
992:#### layer\text(text, font_name, x, y, color)
993-
994-```yuescript
995:layer\text "Score: #{score}", 'main', 10, 10, white!
... [20 more lines]

Grep (text|font)

194-```
195-
196:### layer_draw_texture
197-
198:`layer_draw_texture(layer, texture, x, y, color?, flash?)`
199-
200:Draws a texture at the given position. Color tints the texture (default white). Flash overlays a solid color.
201-
202-```lua
203:local tex = texture_load("player.png")
204:layer_draw_texture(layer, tex, player.x, player.y)
205:layer_draw_texture(layer, tex, x, y, rgba(255, 100, 100), rgba(255, 255, 255, 128))  -- red tint + white flash
206-```
207-
208-### layer_set_blend_mode
209-
210-`layer_set_blend_mode(layer, mode)`
211-
212-Sets the blend mode for subsequent draws. Modes: "alpha" (default), "additive".
213-
214-```lua
215-layer_set_blend_mode(layer, "additive")
216-layer_circle(layer, x, y, 50, rgba(255, 200, 100))  -- glowing effect
217-layer_set_blend_mode(layer, "alpha")
218-```
219-
220-### layer_draw
--
229-```
230-
... [238 more lines]

I see - layer_draw_text draws text at the given position with top-left origin, not centered. I need to manually center it using font\text_width and font_get_height.

What I'll do:

  1. Center the text by offsetting x by -text_width/2 and y by -font_height/2
  2. Adjust the position slightly below and to the right (player) / left (enemy)

For the positioning adjustment, do you mean:

Or do you mean something else by "below and to the right/left"?

Yes, you're correct.

Read (E:/a327ex/emoji-ball-battles/main.yue)

1060→    -- HP UI (heart + number display at top of screen)
  1061→    hp_ui = object 'hp_ui'
  1062→    hp_ui\add spring!
  1063→    hp_ui.spring\add 'heart', 1
  1064→    hp_ui.spring\add 'text', 1
  1065→    hp_ui\set {
  1066→      x: if @team == 'player' then 0.15*gw else 0.85*gw
  1067→      y: 20
  1068→      hp: @hp
  1069→      heart_scale: 22/512
  1070→      refresh: (new_hp) =>
  1071→        @hp = new_hp
  1072→        @spring\pull 'heart', 0.3, 3, 0.7
  1073→        @spring\pull 'text', 0.2, 3, 0.5
  1074→    }
  1075→    hp_ui\action (dt) =>
  1076→      -- Heart on front_3
  1077→      front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  1078→      front_3\image an.images.heart, 0, 0
  1079→      front_3\pop!
  1080→      -- Text on effects
  1081→      effects\push @x, @y, 0, @spring.text.x, @spring.text.x
  1082→      effects\text tostring(@hp), 'fat', 0, 0, white!
  1083→      effects\pop!
  1084→    hp_ui\flow_to @
  1085→
  1086→    -- Start ball movement after 3 seconds
  1087→    @\add timer!
  1088→    @collider\set_gravity_scale 0
  1089→    @timer\after 3, ->

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Done. Positions adjusted and text is now centered on the heart.


Part 4: Create battle_ui class

As discussed earlier, this is no longer needed since each ball manages its own HP UI as a child object.


Part 5: Integrate battle_ui into arena class

Also no longer needed - the HP UI is already integrated directly into each ball.


Part 6: Add dagger attack speed properties

What I'll do:

Add properties to the ball class for tracking attack speed stacking (only relevant for dagger/melee):

@attack_speed_bonus = 0              -- stacking bonus from hits
@attack_speed_per_hit = 0.15*math.pi -- bonus per hit (~0.47 rad/s)
@max_attack_speed_bonus = 3*math.pi  -- cap at doubling base speed

I'll add these right after @base_angular_velocity and @max_angular_velocity are set (around line 1028), since they're related to angular velocity.

These properties will be used in Part 7 (guardrails) and Part 8 (increase method).

Does this look right? Any adjustments to the values?

We need to do more work on the HP UI, but I'll do some of it myself and some of it with your help. For now, let's create an actual hp_ui class below hp_bar that is a class of its own instead of inlined. Code should be the same, just as a class.

Grep (class hp_bar)

1290:class hp_bar extends object
1291-  new: (args={}) =>
1292-    super 'hp_bar'
1293-    @offset_y = args.offset_y or 18 -- below the parent
1294-    @w = args.w or 22
1295-    @h = args.h or 4
1296-    @duration = args.duration or 1.5
1297-    @bg_color = args.bg_color or black!
1298-    @fill_color = args.fill_color or red!
1299-    @visible = false
1300-    @\add timer!
1301-    @\add spring!
1302-
1303-  update: (dt) =>
1304-    x = @parent.x
1305-    y = @parent.y + @offset_y
1306-    fill_w = @w*(@parent.hp/@parent.max_hp)
1307-
1308-    if @visible
1309-      ui\push x, y, 0, @spring.main.x, @spring.main.x
1310-      ui\rounded_rectangle -@w/2, -@h/2, @w, @h, 3, @bg_color
1311-      ui\rounded_rectangle -@w/2, -@h/2, fill_w, @h, 3, @flashing and white! or @fill_color
1312-      ui\pop!
1313-
1314-  activate: =>
1315-    @flashing = true
1316-    @timer\after 0.15, 'flash', -> @flashing = false
1317-    @spring\pull 'main', 0.5, 3, 0.5
1318-    @visible = true
1319-    @timer\after 2, 'visible', -> @visible = false
... [11 more lines]

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Now I need to update the ball constructor to use the class instead of the inline object.

Read (E:/a327ex/emoji-ball-battles/main.yue)

1055→    -- HP
  1056→    @max_hp = 100
  1057→    @hp = @max_hp
  1058→    @\add hp_bar!
  1059→
  1060→    -- HP UI (heart + number display at top of screen)
  1061→    hp_ui = object 'hp_ui'
  1062→    hp_ui\add spring!
  1063→    hp_ui.spring\add 'heart', 1
  1064→    hp_ui.spring\add 'text', 1
  1065→    hp_ui\set {
  1066→      x: if @team == 'player' then 0.2*gw else 0.8*gw
  1067→      y: 28
  1068→      hp: @hp
  1069→      heart_scale: 24/512
  1070→      refresh: (new_hp) =>
  1071→        @hp = new_hp
  1072→        @spring\pull 'heart', 0.3, 3, 0.7
  1073→        @spring\pull 'text', 0.2, 3, 0.5
  1074→    }
  1075→    hp_ui\action (dt) =>
  1076→      -- Heart on front_3
  1077→      front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  1078→      front_3\image an.images.heart, 0, 0
  1079→      front_3\pop!
  1080→      -- Text on effects (centered on heart)
  1081→      text_string = tostring(@hp)
  1082→      text_w = an.fonts.lana\text_width text_string
  1083→      text_h = an.fonts.lana.height
  1084→      effects\push @x, @y, 0, @spring.text.x, @spring.text.x
... [10 more lines]

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Done. The hp_ui class is now defined below hp_bar, and the ball constructor uses @\add hp_ui @team, @hp.

Should we continue with Part 6 (dagger attack speed properties), or do you want to do more work on the HP UI first?

continue with Part 6

OK, let's try multiple things. A vertical bounce on both heart and text when a hit happens. The text should be very slightly behind the heart on the bounce. Heart slightly flashes white on hit. A way to make the heart shape unfilled progressively as HP decreases. So at 50% HP it should be half filled (top half transparent, bottom half red as is). This could likely be done in a shader. You can do the first two directly, tell me your plan for the last one.

I'll implement the first two directly.

Part 1 & 2: Vertical bounce + white flash

Adding to the hp_ui class:

Read (E:/a327ex/emoji-ball-battles/main.yue)

1295→
  1296→
  1297→class hp_ui extends object
  1298→  new: (team, hp) =>
  1299→    super 'hp_ui'
  1300→    @x = if team == 'player' then 0.2*gw else 0.8*gw
  1301→    @y = 28
  1302→    @hp = hp
  1303→    @heart_scale = 24/512
  1304→    @\add spring!
  1305→    @spring\add 'heart', 1
  1306→    @spring\add 'text', 1
  1307→    @\add timer!
  1308→
  1309→  update: (dt) =>
  1310→    -- Heart on front_3
  1311→    front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  1312→    front_3\image an.images.heart, 0, 0
  1313→    front_3\pop!
  1314→    -- Text on effects (centered on heart)
  1315→    text_string = tostring(@hp)
  1316→    text_w = an.fonts.lana\text_width text_string
  1317→    text_h = an.fonts.lana.height
  1318→    effects\push @x, @y, 0, @spring.text.x, @spring.text.x
  1319→    effects\text text_string, 'lana', -text_w/2 + 0.5, -text_h/2, white!
  1320→    effects\pop!
  1321→
  1322→  refresh: (new_hp) =>
  1323→    @hp = new_hp
  1324→    @spring\pull 'heart', 0.3, 3, 0.7
... [10 more lines]

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Done with bounce and flash.


Part 3: Progressive heart unfill (shader plan)

The idea is to make the heart appear to "drain" from top to bottom as HP decreases.

Approach:

Create a shader (e.g., hp_fill.frag) that:

  1. Takes a uniform u_fill (0.0 to 1.0, representing HP percentage)
  2. For each pixel, checks its vertical position in texture coordinates (v_texcoord.y)
  3. If v_texcoord.y < (1.0 - u_fill), the pixel is in the "empty" region - make it transparent or grayscale
  4. Otherwise, keep the original color

Shader pseudocode: ```glsl uniform float u_fill; // 0.0 = empty, 1.0 = full uniform sampler2D u_texture;

void main() { vec4 c = texture(u_texture, v_texcoord); float threshold = 1.0 - u_fill; // at 50% HP, threshold = 0.5

if (v_texcoord.y < threshold) {
    // Empty portion - could be transparent, grayscale, or darker
    fragColor = vec4(c.rgb * 0.3, c.a * 0.5);  // darker and semi-transparent
} else {
    fragColor = c;  // full color
}

} ```

Integration:

Question: The current drawing uses front_3\image. To apply a shader to just the heart, I may need to either:

  1. Draw heart to a separate small layer, apply shader, composite back
  2. Or check if there's a simpler way to draw with a shader inline

Which approach would you prefer? Or do you have a different idea for how the unfilled portion should look (transparent, grayscale, outline-only, etc.)?

To set the shader before drawing the heart specifically we'd need to have access to what happens inside the render function I think? Do we? Or can we?

Let me check what's available in the engine/framework for applying shaders to specific draws.

Grep (shader|blend)

47:an\shader(name, path) -> shader
217:layer\set_blend_mode(mode)
218:layer\apply_shader(shader)
219:layer\shader_set_float(shader, name, value)
220:layer\shader_set_vec2(shader, name, x, y)
221:layer\shader_set_vec4(shader, name, x, y, z, w)
222:layer\shader_set_int(shader, name, value)
231:layer\draw_from(source, shader?)

Grep (apply_shader)

144-an\shader 'outline', 'shaders/outline.frag'
145-
146--- Access later
147:layer\apply_shader an.shaders.blur
148-```
149-
150-Shaders are stored in `an.shaders.name`.
151-
152----
153-
154-#### an\sound(name, path)
155-
156-Loads and registers a sound effect.
157-
158-```yuescript
159-an\sound 'jump', 'assets/jump.ogg'
160-an\sound 'hit', 'assets/hit.ogg'
161-```
162-
163-Sounds are stored in `an.sounds.name`.
164-
165----
166-
167-#### an\music(name, path)
--
1032--- Apply shader with uniforms
1033-layer\shader_set_float an.shaders.blur, 'u_radius', 5
1034-layer\shader_set_vec2 an.shaders.blur, 'u_direction', 1, 0
1035:layer\apply_shader an.shaders.blur
1036-
... [23 more lines]

Grep (layer_set_shader|set_shader|shader.*draw)

274-`layer_draw_from(dst, src, shader?)`
275-
276:Draws the source layer's texture to the destination layer's FBO. Optionally applies a shader during the draw. Uses alpha blending, so multiple sources accumulate.
277-
278-```lua
279--- Copy game layer to shadow layer through shadow shader
280-layer_draw_from(shadow_layer, game_layer, shadow_shader)
281-
282--- Copy without shader (passthrough)
283-layer_draw_from(composite_layer, game_layer)
284-```
285-
286-### shader_set_float_immediate
287-
288-`shader_set_float_immediate(shader, name, value)`
289-
290:Sets a float uniform on a shader immediately. Use before `layer_draw_from`.
291-
292-```lua
293-shader_set_float_immediate(blur_shader, "u_radius", 5.0)
294-```
295-
296-### shader_set_vec2_immediate
297-
298-`shader_set_vec2_immediate(shader, name, x, y)`
299-
300-Sets a vec2 uniform on a shader immediately.
301-
302-```lua
303-shader_set_vec2_immediate(outline_shader, "u_pixel_size", 1/480, 1/270)
... [2 more lines]

Based on the docs, shaders are applied at the layer level, not individual draw calls. The pattern used for shadows/outlines is:

  1. Draw to a source layer
  2. Use layer\draw_from source, shader to copy with shader applied

For the heart fill, we'd need:

  1. Create a dedicated layer for the heart (e.g., heart_layer)
  2. In hp_ui.update: draw heart to heart_layer instead of front_3
  3. In the main draw function:
    • Set shader uniform u_fill
    • Use front_3\draw_from heart_layer, an.shaders.hp_fill to composite with the shader

The tricky part is that each ball has its own hp_ui with different fill amounts. So we'd either need:

Alternative approach: Since both hearts need different fill values, we could have hp_ui store a reference to @max_hp (passed in constructor), then in the draw function iterate through both hp_uis and render each heart individually with its shader. But that requires knowing about both hp_uis from the draw function.

What's your preference? Create dedicated heart layers, or is there a simpler approach you have in mind?

Can we not apply the immediate function to before each draw call related to each heart is called inside the render function?

The issue is that draw commands are queued during update (when front_3\image is called), then all executed together later when front_3\render! is called. So we can't interleave shader uniform changes between queued commands.

But let me check if there's a way to draw with a shader inline at the engine level.

Grep (layer_draw.*shader|draw_texture)

4867-}
4868-
4869:static int l_layer_draw_texture(lua_State* L) {
4870-    Layer* layer = (Layer*)lua_touserdata(L, 1);
4871-    Texture* tex = (Texture*)lua_touserdata(L, 2);
4872-    float x = (float)luaL_checknumber(L, 3);
4873-    float y = (float)luaL_checknumber(L, 4);
4874-    uint32_t color = (uint32_t)luaL_optinteger(L, 5, 0xFFFFFFFF);  // Default white (no tint)
4875-    uint32_t flash = (uint32_t)luaL_optinteger(L, 6, 0x00000000);  // Default black (no flash)
4876-    layer_add_image(layer, tex, x, y, color, flash);
4877-    return 0;
4878-}
4879-
--
7744-    lua_register(L, "layer_push", l_layer_push);
7745-    lua_register(L, "layer_pop", l_layer_pop);
7746:    lua_register(L, "layer_draw_texture", l_layer_draw_texture);
7747-    lua_register(L, "layer_set_blend_mode", l_layer_set_blend_mode);
7748-    lua_register(L, "texture_load", l_texture_load);
7749-    lua_register(L, "texture_unload", l_texture_unload);
7750-    lua_register(L, "texture_get_width", l_texture_get_width);
7751-    lua_register(L, "texture_get_height", l_texture_get_height);
7752-    // --- Spritesheet ---
7753-    lua_register(L, "spritesheet_load", l_spritesheet_load);
7754-    lua_register(L, "spritesheet_get_frame_width", l_spritesheet_get_frame_width);
7755-    lua_register(L, "spritesheet_get_frame_height", l_spritesheet_get_frame_height);
7756-    lua_register(L, "spritesheet_get_total_frames", l_spritesheet_get_total_frames);

Grep (layer_render|layer_add_image)

No matches found

The idea is that \render! is looping through all objects, in Lua, and then calling the immediate functions for each. Do we have access to each immediate function in Lua, or do they happen all in C?

Grep (render)

5-
6-  Layers are FBOs (framebuffer objects) that accumulate draw commands during the frame.
7:  Commands are deferred and processed at frame end via layer_render() with GL batching.
8:  Draw order is FIFO — no z-ordering, call order determines render order.
9-
10-  Usage:
11-    an\layer 'game'                           -- register layer
12-    game = an.layers.game                     -- access layer
13-    game\rectangle 100, 100, 50, 30, color    -- queue rectangle
14-    game\draw!                                -- composite to screen
15-
16-  Properties:
17-    @name   - string, layer identifier
18-    @handle - C layer pointer
19-]]
20-class layer
21-  --[[
22-    Creates a new layer with the given name.
23-
24-    Usage:
25-      layer 'game'
26-      layer 'ui'
27-
28-    Behavior:
--
309-
310-    Parameters:
311:      text  - string to render
312-      font  - font object or font name string
313-      x, y  - position (top-left of text)
... [80 more lines]

Looking at the code, layer\render! calls layer_render @handle which is a C function. The draw commands are queued in Lua (via layer\image, etc.) but then batch-processed all at once in C.

So we have access to shader_set_float_immediate from Lua, but it would only affect the next layer_draw_from call, not individual draws within a batched layer_render.

The commands are batched in C for performance (GL batching), so we can't interleave Lua shader calls between individual queued draws.

Options:

  1. Two separate layers - one for each heart, render each with its own shader uniform
  2. Modify the engine - add per-draw shader state to the command queue (bigger change)
  3. Different approach - use two overlapping images (full heart + empty heart outline) and scale/clip instead of shader

Would option 1 (two heart layers) work for you, or do you want to explore a different approach?

I think 3 makes most sense, actually. Although the original heart image has no outline at all. Couldn't we just do like a scissor/stencil effect instead? Did we implement those?

Grep (scissor|stencil|clip)

6630-    if ((tag->category_bit & ctx->tag_mask) == 0) return 1.0f;  // Skip, continue
6631-
6632:    // This hit matches - record it and clip the ray to this distance
6633-    ctx->shape = shape_id;
6634-    ctx->point = point;
6635-    ctx->normal = normal;
6636-    ctx->fraction = fraction;
6637-    ctx->hit = true;
6638-
6639-    return fraction;  // Clip ray to this distance (find closer matches only)
6640-}
6641-
6642-// Raycast context for collecting all hits

Grep (glScissor|glStencil|GL_SCISSOR|GL_STENCIL)

No matches found

Grep (scissor|stencil|clip|mask)

No matches found

No scissor or stencil operations are implemented in the engine currently.

Alternatives without engine changes:

  1. Two heart images - Create heart_empty.png (outline or grayed out version) and heart_full.png. Draw empty first, then draw full on top with a vertical offset/crop. Though cropping isn't available either...

  2. Vertical slice approach - Pre-render heart into multiple horizontal slices (e.g., 10 images representing 10%, 20%, etc. fill levels). Draw the appropriate slice based on HP. Crude but works.

  3. Add scissor to engine - Relatively simple addition. Just need glEnable(GL_SCISSOR_TEST) and glScissor(x, y, w, h) before draws, then disable after. Could expose as layer\scissor x, y, w, h and layer\scissor_off!.

  4. Use a layer as mask - Draw heart to a temp layer, draw a rectangle covering the "empty" portion with transparency, composite. Hacky but possible with current features.

Would you like me to implement option 3 (add scissor to engine)? It's a fairly small addition - probably 20-30 lines in anchor.c plus the Lua bindings.

What does the scissor API look like in YueScript?

For the heart HP use case, something like:

-- In hp_ui update:
heart_h = 24  -- heart size in pixels
fill_h = heart_h * (@hp / @max_hp)
clip_y = @y - heart_h/2 + (heart_h - fill_h)  -- top of filled portion

front_3\scissor @x - heart_h/2, clip_y, heart_h, fill_h
front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
front_3\image an.images.heart, 0, 0
front_3\pop!
front_3\scissor_off!

The API would be: yuescript layer\scissor x, y, w, h -- enable scissor with rectangle (in layer/world coords) layer\scissor_off! -- disable scissor

Caveat: OpenGL scissor works in screen coordinates, so the engine implementation would need to transform the coordinates through the camera and scale. This adds complexity.

Simpler alternative: If scissor coordinates are always in screen-space (ignoring camera), the API is simpler but the user has to calculate screen positions manually.

Which would you prefer - world-space coords (engine handles transform) or screen-space coords (simpler implementation, user calculates)?

Engine should handle. But remember that we're queueing commands in Lua, they're never immediate. So your implementation here also has to queue these scissor commands. Were you imagining that? Does it add ocmplexity?

Yes, I was imagining queuing. The implementation would be:

  1. Add SCISSOR_ON and SCISSOR_OFF command types to the layer's command queue (alongside IMAGE, RECTANGLE, TEXT, etc.)
  2. layer\scissor x, y, w, h queues a SCISSOR_ON command with world coordinates
  3. layer\scissor_off! queues a SCISSOR_OFF command
  4. During layer_render, when processing commands in order:
    • SCISSOR_ON: transform coords through camera, call glEnable(GL_SCISSOR_TEST) + glScissor(...)
    • SCISSOR_OFF: call glDisable(GL_SCISSOR_TEST)
    • IMAGE/RECT/etc: draw as usual (scissor state persists between draws)

Complexity added:

Roughly 80-100 lines total. The main complexity is getting the coordinate transform right (world → screen, accounting for camera position and game scale).

One question: should scissor interact with the transform stack (push/pop), or only with the camera? I'm thinking camera-only makes more sense for this use case - the scissor rect stays fixed in world space regardless of object transforms.

The camera works on push/pop transforms, so if you solve for general push/pop you get the camera for free, right?

You're right. The camera is just transforms applied via push/pop. If scissor coordinates go through the current transform matrix at render time, camera comes for free.

So the implementation:

  1. Queue scissor command with raw world coordinates
  2. At render time, transform the rect corners through the current transform matrix (same one used for vertices)
  3. Convert to screen coords and call glScissor

One caveat: if there's rotation in the transform, an axis-aligned scissor rect becomes a rotated rect, but GL scissor only does axis-aligned. We'd have to use the axis-aligned bounding box of the rotated rect. For the heart case (no rotation), this isn't an issue.

Should I implement this in anchor.c now?

Hmm, the fact that it's only axis-aligned kind of doesn't work. The current code has the handcam code going which slightly rotates the camera, thus the scissor will probably look off. Is there another way of doing this that would allow arbitrary shapes to be used as masks like this?

Good point about the handcam rotation. For arbitrary shape masking, the options are:

  1. Stencil buffer - Draw mask shape to stencil, then only draw where stencil passes. Supports arbitrary shapes, but also needs queued commands and is more complex to implement.

  2. Shader in texture space - A shader that discards pixels based on texture V coordinate (not world Y). Since it operates in texture space, rotation doesn't matter - the heart always "drains" from its own top regardless of camera rotation. But we still have the batching issue for different fill amounts per heart.

  3. Two dedicated heart layers - Each heart gets its own layer. In the render function:

    • Set fill uniform for player, apply shader to player_heart_layer
    • Set fill uniform for enemy, apply shader to enemy_heart_layer
    • Composite both to front_3

    This sidesteps the batching problem entirely since each layer is processed separately.

Option 3 is probably the cleanest given current engine capabilities - no engine changes needed, just two small layers and a simple shader that discards based on V coordinate.

Would that work, or do you want to explore stencil?

What does option 1 look like, API wise?

For the heart HP case:

-- In hp_ui update:
fill_ratio = @hp / @max_hp
heart_h = 24
fill_h = heart_h * fill_ratio
mask_y = @y + heart_h/2 - fill_h  -- bottom portion of heart

-- Draw mask shape to stencil buffer (not visible)
front_3\stencil_mask!
front_3\rectangle @x - heart_h/2, mask_y, heart_h, fill_h, white!

-- Now only draw where stencil was set
front_3\stencil_test!
front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
front_3\image an.images.heart, 0, 0
front_3\pop!

-- Disable stencil
front_3\stencil_off!

The API: yuescript layer\stencil_mask! -- subsequent draws go to stencil buffer only (invisible) layer\stencil_test! -- subsequent draws only appear where stencil is set layer\stencil_off! -- disable stencil, back to normal drawing

The mask rectangle goes through the transform stack, so camera rotation is handled naturally. The stencil test happens per-pixel after transforms.

Engine implementation:

What makes this more difficult than the scissor thing?

Honestly, not much. Looking at it again:

Scissor:

Stencil:

The only extra complexity for stencil:

  1. Ensure FBO has stencil attachment (might need to modify FBO creation if it doesn't)
  2. A few more GL state calls

But stencil is actually simpler in that we don't need to transform coordinates ourselves - the mask shape just draws through the normal pipeline.

Given it's similar effort but stencil is more flexible and handles rotation correctly, probably worth going with stencil. Want me to implement it?

Yes.

Grep (glFramebuffer|GL_FRAMEBUFFER|FBO|framebuffer)

8- * - Physics foundation (tags, events, PCG32 random)
9- * - Resources (Texture, Font, Sound, Music)
10: * - Layer system (FBO, transforms, command queue, batching)
11- * - Input system (keyboard, mouse, gamepad, actions, chords, sequences, holds)
12- * - Rendering pipeline (shader execution, command processing)
13- * - Lua bindings: Rendering, Physics, Random, Input
14- * - Lua registration (register_lua_bindings)
15- * - Shader sources and compilation
16- * - Main loop, initialization, shutdown
17- */
18-
19-#include <stdio.h>
20-#include <stdlib.h>
--
1498-// ============================================================================
1499-// LAYER SYSTEM
1500:// FBO management, transform stack, command queue, drawing primitives
1501-// ============================================================================
1502-
1503:// Create a layer with FBO at specified resolution
1504-static Layer* layer_create(int width, int height) {
1505-    Layer* layer = (Layer*)calloc(1, sizeof(Layer));
1506-    if (!layer) return NULL;
1507-
1508-    layer->width = width;
1509-    layer->height = height;
1510-
1511-    // Initialize transform stack with identity matrix at depth 0
1512-    layer->transform_depth = 0;
1513-    float* m = layer->transform_stack;
... [212 more lines]

Grep (DrawCommand|CMD_|command_count)

5- * FILE STRUCTURE (search for section banners):
6- *
7: * - Includes, constants, core structs (DrawCommand, Layer)
8- * - Physics foundation (tags, events, PCG32 random)
9- * - Resources (Texture, Font, Sound, Music)
10- * - Layer system (FBO, transforms, command queue, batching)
11- * - Input system (keyboard, mouse, gamepad, actions, chords, sequences, holds)
12- * - Rendering pipeline (shader execution, command processing)
13- * - Lua bindings: Rendering, Physics, Random, Input
14- * - Lua registration (register_lua_bindings)
15- * - Shader sources and compilation
16- * - Main loop, initialization, shutdown
17- */
18-
19-#include <stdio.h>
20-#include <stdlib.h>
21-#include <stdbool.h>
22-#include <string.h>
23-#include <math.h>
24-
25-#ifdef _WIN32
26-#include <direct.h>  // _chdir
27-#else
28-#include <unistd.h>  // chdir
29-#endif
30-
31-#include <SDL.h>
32-
33-#ifdef __EMSCRIPTEN__
34-    #include <emscripten.h>
... [122 more lines]

Grep (COMMAND_RECTANGLE|COMMAND_CIRCLE|COMMAND_SPRITE|enum.*command|#define COMMAND)

313-// Command types
314-enum {
315:    COMMAND_RECTANGLE = 0,
316:    COMMAND_CIRCLE,
317:    COMMAND_SPRITE,
318-    COMMAND_GLYPH,              // Font glyph with custom UVs (uses flash_color for packed UVs)
319:    COMMAND_SPRITESHEET_FRAME,  // Spritesheet frame with custom UVs and flash support
320-    COMMAND_LINE,               // Line segment / capsule
321-    COMMAND_TRIANGLE,           // Triangle (3 vertices)
322-    COMMAND_POLYGON,            // Polygon (up to 8 vertices)
323-    COMMAND_ROUNDED_RECTANGLE,  // Rounded rectangle
324:    COMMAND_RECTANGLE_GRADIENT_H, // Horizontal gradient rectangle (left to right)
325:    COMMAND_RECTANGLE_GRADIENT_V, // Vertical gradient rectangle (top to bottom)
326-    COMMAND_APPLY_SHADER,       // Post-process layer through a shader
327-    COMMAND_SET_UNIFORM_FLOAT,  // Set float uniform on shader
328-    COMMAND_SET_UNIFORM_VEC2,   // Set vec2 uniform on shader
329-    COMMAND_SET_UNIFORM_VEC4,   // Set vec4 uniform on shader
330-    COMMAND_SET_UNIFORM_INT,    // Set int uniform on shader
331-};
332-
333-// Blend modes
334-enum {
335-    BLEND_ALPHA = 0,
336-    BLEND_ADDITIVE,
337-};
338-
339-// DrawCommand — stores one deferred draw call
340-// Explicitly padded to 64 bytes for consistent memory layout across platforms
341-//
342-\ Coordinate conventions:
... [214 more lines]

Grep (layer_add_command)

1617-// Add a command to the layer's queue (returns pointer to the new command)
1618-// Returns NULL if queue is full (MAX_COMMAND_CAPACITY reached)
1619:static DrawCommand* layer_add_command(Layer* layer) {
1620-    if (layer->command_count >= layer->command_capacity) {
1621-        // Fixed size queue - don't grow, just drop the command
1622-        // This should never happen in normal use (16384 commands per frame is huge)
1623-        static bool warned = false;
1624-        if (!warned) {
1625-            fprintf(stderr, "Error: Command queue full (%d commands). Dropping draw calls.\n",
1626-                    layer->command_capacity);
1627-            warned = true;
1628-        }
1629-        return NULL;
1630-    }
1631-
1632-    DrawCommand* cmd = &layer->commands[layer->command_count++];
1633-    memset(cmd, 0, sizeof(DrawCommand));
1634-    cmd->blend_mode = layer->current_blend;
--
1644-// Record a rectangle command (stroke=0 filled, stroke>0 outline)
1645-static void layer_add_rectangle(Layer* layer, float x, float y, float w, float h, float stroke, uint32_t color) {
1646:    DrawCommand* cmd = layer_add_command(layer);
1647-    if (!cmd) return;
1648-    cmd->type = COMMAND_RECTANGLE;
1649-    cmd->color = color;
1650-    cmd->params[0] = x;
1651-    cmd->params[1] = y;
1652-    cmd->params[2] = w;
1653-    cmd->params[3] = h;
1654-    cmd->params[4] = stroke;
... [156 more lines]

Now let me check the Lua bindings section and the layer.yue wrapper.

Grep (l_layer_rectangle|lua_register.*layer)

4304-
4305-// layer_rectangle(layer, x, y, w, h, color) -- filled rectangle
4306:static int l_layer_rectangle(lua_State* L) {
4307-    Layer* layer = (Layer*)lua_touserdata(L, 1);
4308-    float x = (float)luaL_checknumber(L, 2);
4309-    float y = (float)luaL_checknumber(L, 3);
4310-    float w = (float)luaL_checknumber(L, 4);
4311-    float h = (float)luaL_checknumber(L, 5);
4312-    uint32_t color = (uint32_t)luaL_checkinteger(L, 6);
4313-    layer_add_rectangle(layer, x, y, w, h, 0.0f, color); // stroke=0 for filled
4314-    return 0;
4315-}
4316-
4317-// layer_rectangle_line(layer, x, y, w, h, color, line_width?) -- rectangle outline
4318:static int l_layer_rectangle_line(lua_State* L) {
4319-    Layer* layer = (Layer*)lua_touserdata(L, 1);
4320-    float x = (float)luaL_checknumber(L, 2);
4321-    float y = (float)luaL_checknumber(L, 3);
4322-    float w = (float)luaL_checknumber(L, 4);
4323-    float h = (float)luaL_checknumber(L, 5);
4324-    uint32_t color = (uint32_t)luaL_checkinteger(L, 6);
4325-    float line_width = (float)luaL_optnumber(L, 7, 1.0);
4326-    layer_add_rectangle(layer, x, y, w, h, line_width, color);
4327-    return 0;
4328-}
4329-
4330-// layer_rectangle_gradient_h(layer, x, y, w, h, color1, color2) -- horizontal gradient rectangle
4331:static int l_layer_rectangle_gradient_h(lua_State* L) {
4332-    Layer* layer = (Layer*)lua_touserdata(L, 1);
4333-    float x = (float)luaL_checknumber(L, 2);
... [52 more lines]

Now I have everything I need. Let me implement the stencil feature. I'll make the changes to anchor.c.

Read (E:/a327ex/Anchor/engine/src/anchor.c)

313→// Command types
   314→enum {
   315→    COMMAND_RECTANGLE = 0,
   316→    COMMAND_CIRCLE,
   317→    COMMAND_SPRITE,
   318→    COMMAND_GLYPH,              // Font glyph with custom UVs (uses flash_color for packed UVs)
   319→    COMMAND_SPRITESHEET_FRAME,  // Spritesheet frame with custom UVs and flash support
   320→    COMMAND_LINE,               // Line segment / capsule
   321→    COMMAND_TRIANGLE,           // Triangle (3 vertices)
   322→    COMMAND_POLYGON,            // Polygon (up to 8 vertices)
   323→    COMMAND_ROUNDED_RECTANGLE,  // Rounded rectangle
   324→    COMMAND_RECTANGLE_GRADIENT_H, // Horizontal gradient rectangle (left to right)
   325→    COMMAND_RECTANGLE_GRADIENT_V, // Vertical gradient rectangle (top to bottom)
   326→    COMMAND_APPLY_SHADER,       // Post-process layer through a shader
   327→    COMMAND_SET_UNIFORM_FLOAT,  // Set float uniform on shader
   328→    COMMAND_SET_UNIFORM_VEC2,   // Set vec2 uniform on shader
   329→    COMMAND_SET_UNIFORM_VEC4,   // Set vec4 uniform on shader
   330→    COMMAND_SET_UNIFORM_INT,    // Set int uniform on shader
   331→};
   332→
   333→// Blend modes
   334→enum {
   335→    BLEND_ALPHA = 0,
   336→    BLEND_ADDITIVE,
   337→};

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now let me add the stencil renderbuffer to the Layer struct.

Read (E:/a327ex/Anchor/engine/src/anchor.c)

385→    static_assert(sizeof(DrawCommand) == 120, "DrawCommand must be 120 bytes");
   386→#else
   387→    _Static_assert(sizeof(DrawCommand) == 120, "DrawCommand must be 120 bytes");
   388→#endif
   389→
   390→// Layer
   391→typedef struct {
   392→    GLuint fbo;
   393→    GLuint color_texture;
   394→    int width;
   395→    int height;
   396→
   397→    // Effect ping-pong buffers (created on first use)
   398→    GLuint effect_fbo;
   399→    GLuint effect_texture;
   400→    bool textures_swapped;  // Which buffer is current result
   401→
   402→    // Transform stack (mat3 stored as 9 floats: row-major)
   403→    // Each mat3: [m00 m01 m02 m10 m11 m12 m20 m21 m22]
   404→    // Represents 2D affine transform (2x3 used, bottom row is 0,0,1)
   405→    float transform_stack[MAX_TRANSFORM_DEPTH * 9];
   406→    int transform_depth;
   407→
   408→    // Command queue (deferred rendering)
   409→    DrawCommand* commands;
   410→    int command_count;
   411→    int command_capacity;
   412→
   413→    // Current state
   414→    uint8_t current_blend;

Read (E:/a327ex/Anchor/engine/src/anchor.c)

385→    static_assert(sizeof(DrawCommand) == 120, "DrawCommand must be 120 bytes");
   386→#else
   387→    _Static_assert(sizeof(DrawCommand) == 120, "DrawCommand must be 120 bytes");
   388→#endif
   389→
   390→// Layer
   391→typedef struct {
   392→    GLuint fbo;
   393→    GLuint color_texture;
   394→    int width;
   395→    int height;
   396→
   397→    // Effect ping-pong buffers (created on first use)
   398→    GLuint effect_fbo;
   399→    GLuint effect_texture;
   400→    bool textures_swapped;  // Which buffer is current result
   401→
   402→    // Transform stack (mat3 stored as 9 floats: row-major)
   403→    // Each mat3: [m00 m01 m02 m10 m11 m12 m20 m21 m22]
   404→    // Represents 2D affine transform (2x3 used, bottom row is 0,0,1)
   405→    float transform_stack[MAX_TRANSFORM_DEPTH * 9];
   406→    int transform_depth;
   407→
   408→    // Command queue (deferred rendering)
   409→    DrawCommand* commands;
   410→    int command_count;
   411→    int command_capacity;
   412→
   413→    // Current state
   414→    uint8_t current_blend;
... [5 more lines]

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now let me modify layer_create to add the stencil renderbuffer.

Read (E:/a327ex/Anchor/engine/src/anchor.c)

1500→#endif
  1501→
  1502→// ============================================================================
  1503→// LAYER SYSTEM
  1504→// FBO management, transform stack, command queue, drawing primitives
  1505→// ============================================================================
  1506→
  1507→// Create a layer with FBO at specified resolution
  1508→static Layer* layer_create(int width, int height) {
  1509→    Layer* layer = (Layer*)calloc(1, sizeof(Layer));
  1510→    if (!layer) return NULL;
  1511→
  1512→    layer->width = width;
  1513→    layer->height = height;
  1514→
  1515→    // Initialize transform stack with identity matrix at depth 0
  1516→    layer->transform_depth = 0;
  1517→    float* m = layer->transform_stack;
  1518→    m[0] = 1.0f; m[1] = 0.0f; m[2] = 0.0f;  // row 0
  1519→    m[3] = 0.0f; m[4] = 1.0f; m[5] = 0.0f;  // row 1
  1520→    m[6] = 0.0f; m[7] = 0.0f; m[8] = 1.0f;  // row 2
  1521→
  1522→    // Initialize command queue (fixed size, never grows)
  1523→    layer->commands = (DrawCommand*)malloc(MAX_COMMAND_CAPACITY * sizeof(DrawCommand));
  1524→    if (!layer->commands) {
  1525→        free(layer);
  1526→        return NULL;
  1527→    }
  1528→    layer->command_count = 0;
  1529→    layer->command_capacity = MAX_COMMAND_CAPACITY;
... [30 more lines]

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now let me update layer_destroy to clean up the stencil renderbuffer.

Read (E:/a327ex/Anchor/engine/src/anchor.c)

1560→        return NULL;
  1561→    }
  1562→
  1563→    glBindFramebuffer(GL_FRAMEBUFFER, 0);
  1564→    return layer;
  1565→}
  1566→
  1567→static void layer_destroy(Layer* layer) {
  1568→    if (!layer) return;
  1569→    if (layer->commands) free(layer->commands);
  1570→    if (layer->color_texture) glDeleteTextures(1, &layer->color_texture);
  1571→    if (layer->fbo) glDeleteFramebuffers(1, &layer->fbo);
  1572→    // Effect ping-pong buffers
  1573→    if (layer->effect_texture) glDeleteTextures(1, &layer->effect_texture);
  1574→    if (layer->effect_fbo) glDeleteFramebuffers(1, &layer->effect_fbo);
  1575→    free(layer);
  1576→}
  1577→
  1578→// Ensure effect buffer exists (lazy creation)
  1579→static void layer_ensure_effect_buffer(Layer* layer) {
  1580→    if (layer->effect_fbo != 0) return;  // Already created
  1581→
  1582→    // Create effect texture
  1583→    glGenTextures(1, &layer->effect_texture);
  1584→    glBindTexture(GL_TEXTURE_2D, layer->effect_texture);

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now let me add the functions to queue stencil commands. I'll add them after the other layer_add_* functions.

Grep (layer_add_spritesheet_frame)

1823:static void layer_add_spritesheet_frame(Layer* layer, GLuint texture_id, float x, float y, float w, float h,
1824-                                        float u0, float v0, float u1, float v1,
1825-                                        uint32_t color, uint32_t flash_color) {
1826-    DrawCommand* cmd = layer_add_command(layer);
1827-    if (!cmd) return;
1828-    cmd->type = COMMAND_SPRITESHEET_FRAME;
1829-    cmd->color = color;
1830-    cmd->flash_color = flash_color;
1831-    cmd->texture_id = texture_id;
1832-    cmd->params[0] = x;
1833-    cmd->params[1] = y;
1834-    cmd->params[2] = w;
1835-    cmd->params[3] = h;
1836-    cmd->params[4] = pack_uv_pair(u0, v0);
1837-    cmd->params[5] = pack_uv_pair(u1, v1);
1838-}
1839-
1840-// Draw a single glyph with transform (for per-character effects in YueScript)
1841-// x, y is baseline position; r, sx, sy are rotation/scale applied at that point
1842-static void layer_draw_glyph(Layer* layer, const char* font_name, uint32_t codepoint,
1843-                             float x, float y, float r, float sx, float sy, uint32_t color) {
--
4693:    layer_add_spritesheet_frame(layer, sheet->texture->id, x, y,
4694-                                (float)sheet->frame_width, (float)sheet->frame_height,
4695-                                u0, v0, u1, v1, color, flash);
4696-    return 0;
4697-}
4698-
4699-// Font Lua bindings
4700-static int l_font_load(lua_State* L) {
... [13 more lines]

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now let me handle the stencil commands in layer_render. First, let me find where to add the cases.

Read (E:/a327ex/Anchor/engine/src/anchor.c)

4250→                    batch_flush();
  4251→                    current_batch_texture = 0;
  4252→                }
  4253→                process_rectangle_gradient_h(cmd);
  4254→                break;
  4255→            case COMMAND_RECTANGLE_GRADIENT_V:
  4256→                // SDF shapes use no texture - flush if we were drawing sprites
  4257→                if (current_batch_texture != 0 && batch_vertex_count > 0) {
  4258→                    batch_flush();
  4259→                    current_batch_texture = 0;
  4260→                }
  4261→                process_rectangle_gradient_v(cmd);
  4262→                break;
  4263→            case COMMAND_SPRITE:
  4264→                process_sprite(cmd);
  4265→                break;
  4266→            case COMMAND_GLYPH:
  4267→                process_glyph(cmd);
  4268→                break;
  4269→            case COMMAND_SPRITESHEET_FRAME:
  4270→                process_spritesheet_frame(cmd);
  4271→                break;
  4272→        }
  4273→
  4274→        // Flush if batch is getting full
  4275→        if (batch_vertex_count >= MAX_BATCH_VERTICES - 6) {
  4276→            batch_flush();
  4277→        }
  4278→    }
  4279→
... [30 more lines]

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now I need to clear the stencil buffer when the layer is rendered. Let me check l_layer_render.

Read (E:/a327ex/Anchor/engine/src/anchor.c)

5100→
  5101→static int l_layer_reset_effects(lua_State* L) {
  5102→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  5103→    layer_reset_effects(layer);
  5104→    return 0;
  5105→}
  5106→
  5107→// Clear a layer's FBO contents (transparent black)
  5108→static int l_layer_clear(lua_State* L) {
  5109→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  5110→
  5111→    // Bind the layer's current target FBO
  5112→    GLuint target_fbo = layer->textures_swapped ? layer->effect_fbo : layer->fbo;
  5113→    glBindFramebuffer(GL_FRAMEBUFFER, target_fbo);
  5114→    glViewport(0, 0, layer->width, layer->height);
  5115→
  5116→    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  5117→    glClear(GL_COLOR_BUFFER_BIT);
  5118→
  5119→    return 0;
  5120→}
  5121→
  5122→// Render a layer's queued commands to its FBO (with clear)
  5123→// This is called explicitly from Lua draw() instead of automatically
  5124→static int l_layer_render(lua_State* L) {
  5125→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  5126→
  5127→    // Bind layer's FBO
  5128→    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
  5129→    glViewport(0, 0, layer->width, layer->height);

Read (E:/a327ex/Anchor/engine/src/anchor.c)

5122→// Render a layer's queued commands to its FBO (with clear)
  5123→// This is called explicitly from Lua draw() instead of automatically
  5124→static int l_layer_render(lua_State* L) {
  5125→    Layer* layer = (Layer*)lua_touserdata(L, 1);
  5126→
  5127→    // Bind layer's FBO
  5128→    glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
  5129→    glViewport(0, 0, layer->width, layer->height);
  5130→
  5131→    // Clear to transparent black
  5132→    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
  5133→    glClear(GL_COLOR_BUFFER_BIT);
  5134→
  5135→    // Process all queued commands
  5136→    layer_render(layer);
  5137→
  5138→    // Clear command queue for next frame
  5139→    layer->command_count = 0;
  5140→
  5141→    return 0;
  5142→}
  5143→
  5144→// Draw source layer's texture to destination layer's FBO
  5145→// Optional shader parameter - if 0/nil, uses passthrough
  5146→static int l_layer_draw_from(lua_State* L) {

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now let me add the Lua bindings. Let me find a good place near the other layer bindings.

Grep (l_layer_set_blend_mode)

4935-}
4936-
4937:static int l_layer_set_blend_mode(lua_State* L) {
4938-    Layer* layer = (Layer*)lua_touserdata(L, 1);
4939-    const char* mode = luaL_checkstring(L, 2);
4940-    if (strcmp(mode, "alpha") == 0) {
4941-        layer_set_blend_mode(layer, BLEND_ALPHA);
4942-    } else if (strcmp(mode, "additive") == 0) {
4943-        layer_set_blend_mode(layer, BLEND_ADDITIVE);
4944-    } else {
4945-        return luaL_error(L, "Invalid blend mode: %s (use 'alpha' or 'additive')", mode);
4946-    }
4947-    return 0;
4948-}
4949-
4950-// Effect shader Lua bindings
4951-static int l_shader_load_file(lua_State* L) {
4952-    const char* path = luaL_checkstring(L, 1);
--
7811-    lua_register(L, "layer_pop", l_layer_pop);
7812-    lua_register(L, "layer_draw_texture", l_layer_draw_texture);
7813:    lua_register(L, "layer_set_blend_mode", l_layer_set_blend_mode);
7814-    lua_register(L, "texture_load", l_texture_load);
7815-    lua_register(L, "texture_unload", l_texture_unload);
7816-    lua_register(L, "texture_get_width", l_texture_get_width);
7817-    lua_register(L, "texture_get_height", l_texture_get_height);
7818-    // --- Spritesheet ---
7819-    lua_register(L, "spritesheet_load", l_spritesheet_load);
7820-    lua_register(L, "spritesheet_get_frame_width", l_spritesheet_get_frame_width);
7821-    lua_register(L, "spritesheet_get_frame_height", l_spritesheet_get_frame_height);
... [7 more lines]

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now let me register the Lua bindings.

Edit (E:/a327ex/Anchor/engine/src/anchor.c)

The file E:/a327ex/Anchor/engine/src/anchor.c has been updated successfully.

Now let me add the YueScript wrappers in layer.yue.

Read (E:/a327ex/Anchor/framework/anchor/layer.yue)

400→    Parameters:
   401→      shader - shader handle (from an\shader or an\shader_string)
   402→
   403→    Behavior:
   404→      - Applies shader via ping-pong rendering (reads from layer, writes result back)
   405→      - Multiple shaders can be chained (call apply_shader multiple times)
   406→      - Set uniforms before calling apply_shader
   407→  ]]
   408→  apply_shader: (shader) =>
   409→    layer_apply_shader @handle, shader
   410→
   411→  --[[
   412→    Sets a float uniform on a shader for this layer.
   413→
   414→    Usage:
   415→      layer\shader_set_float an.shaders.blur, 'u_radius', 5.0
   416→
   417→    Parameters:
   418→      shader - shader handle
   419→      name   - uniform name in shader
   420→      value  - float value
   421→  ]]
   422→  shader_set_float: (shader, name, value) =>
   423→    layer_shader_set_float @handle, shader, name, value
   424→
   425→  --[[
   426→    Sets a vec2 uniform on a shader for this layer.
   427→
   428→    Usage:
   429→      layer\shader_set_vec2 an.shaders.outline, 'u_pixel_size', 1/480, 1/270
... [30 more lines]

Read (E:/a327ex/Anchor/framework/anchor/layer.yue)

540→      - Binds this layer's FBO as render target
   541→      - Draws source layer's texture as a fullscreen quad
   542→      - If shader provided, applies it during the draw
   543→      - Uses alpha blending, so multiple sources accumulate
   544→      - Call clear! first if you want to replace instead of accumulate
   545→  ]]
   546→  draw_from: (source, shader) =>
   547→    layer_draw_from @handle, source.handle, shader
   548→

Edit (E:/a327ex/Anchor/framework/anchor/layer.yue)

The file E:/a327ex/Anchor/framework/anchor/layer.yue has been updated successfully.

Now let me build the engine to verify there are no compilation errors.

Bash (cd E:/a327ex/Anchor/engine && ./build.bat)

anchor.c
src/anchor.c(229): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(964): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(1164): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2273): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2267): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
src/anchor.c(2658): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2936): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(2942): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(3052): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(3061): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(3155): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(3157): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(4334): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.
src/anchor.c(5280): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(6059): warning C4244: 'initializing': conversion from 'lua_Number' to 'float', possible loss of data
src/anchor.c(6060): warning C4244: 'initializing': conversion from 'lua_Number' to 'float', possible loss of data
src/anchor.c(7618): warning C4244: '=': conversion from 'lua_Integer' to 'int', possible loss of data
src/anchor.c(7619): warning C4244: '=': conversion from 'lua_Integer' to 'int', possible loss of data
src/anchor.c(7625): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(8468): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(8472): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(8477): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(8481): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(8487): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(8491): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(8497): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
src/anchor.c(8501): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
gl.c
Generating Code...
... [2 more lines]

Engine built successfully. Let me copy it to the emoji-ball-battles project.

Bash (cp E:/a327ex/Anchor/engine/build/anchor.exe E:/a327ex/emoji-ball-battles/)

Bash (cp E:/a327ex/Anchor/framework/anchor/layer.yue E:/a327ex/emoji-ball-battles/anch...)

Done! The stencil feature is now implemented. Here's a summary:

Changes made:

  1. anchor.c:

    • Added stencil renderbuffer to Layer struct
    • FBOs now have a depth-stencil attachment (GL_DEPTH24_STENCIL8)
    • Added 3 new command types: COMMAND_STENCIL_MASK, COMMAND_STENCIL_TEST, COMMAND_STENCIL_OFF
    • Added layer_stencil_mask(), layer_stencil_test(), layer_stencil_off() functions
    • Handle stencil commands in layer_render (with batch flush before state changes)
    • Clear stencil buffer along with color buffer in l_layer_render
    • Added Lua bindings and registered them
  2. layer.yue:

    • Added stencil_mask!, stencil_test!, stencil_off! wrapper methods with documentation

Usage in hp_ui for the heart fill:

-- In hp_ui update method:
fill_ratio = @hp / @parent.max_hp  -- or however you get max_hp
heart_h = 24
fill_h = heart_h * fill_ratio

-- Draw mask rectangle (bottom portion of heart area)
front_3\stencil_mask!
front_3\rectangle @x - heart_h/2, @y + heart_h/2 - fill_h, heart_h, fill_h, white!

-- Now draw heart, only visible where mask was drawn
front_3\stencil_test!
front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
front_3\image an.images.heart, 0, 0, nil, @flashing and white!
front_3\pop!

front_3\stencil_off!

Would you like me to integrate this into the hp_ui class now?

ERROR: main.lua:404: attempt to call a nil value (method 'rectangle_gradient_v') stack traceback: main.lua:404: in method 'early_update' anchor/object.lua:383: in method '_early_update' anchor/init.lua:1502: in function 'update'

It's possible the layer.yue function from here was more advanced than the one in Anchor, so by copying it you removed some functions.

You're right, let me check what's missing. Let me look at the Anchor framework layer.yue for rectangle_gradient_v.

Grep (rectangle_gradient)

No matches found

The Anchor framework doesn't have it. Let me check what the engine exposes and add the missing wrapper.

Grep (layer_rectangle_gradient)

4387:// layer_rectangle_gradient_h(layer, x, y, w, h, color1, color2) -- horizontal gradient rectangle
4388:static int l_layer_rectangle_gradient_h(lua_State* L) {
4400:// layer_rectangle_gradient_v(layer, x, y, w, h, color1, color2) -- vertical gradient rectangle
4401:static int l_layer_rectangle_gradient_v(lua_State* L) {
7816:    lua_register(L, "layer_rectangle_gradient_h", l_layer_rectangle_gradient_h);
7817:    lua_register(L, "layer_rectangle_gradient_v", l_layer_rectangle_gradient_v);

The engine has the functions but the framework wrapper is missing. Let me add the gradient rectangle methods to layer.yue.

Grep (rectangle:)

44-    Parameters:
45-      x, y  - top-left position
46-      w, h  - width and height
47-      color - packed RGBA (use rgba() helper)
48-  ]]
49:  rectangle: (x, y, w, h, color) =>
50-    layer_rectangle @handle, x, y, w, h, color
51-
52-  --[[
53-    Queues a filled circle centered at (x, y).
54-
55-    Usage:
56-      layer\circle 200, 150, 25, rgba(0, 255, 0, 255)
57-
58-    Parameters:
59-      x, y   - center position
60-      radius - circle radius
61-      color  - packed RGBA (use rgba() helper)
62-  ]]
63-  circle: (x, y, radius, color) =>
64-    layer_circle @handle, x, y, radius, color
--
220-      x, y   - top-left position
221-      w, h   - width and height
222-      radius - corner radius
223-      color  - packed RGBA (use rgba() helper)
224-  ]]
225:  rounded_rectangle: (x, y, w, h, radius, color) =>
226-    layer_rounded_rectangle @handle, x, y, w, h, radius, color
227-
... [13 more lines]

Read (E:/a327ex/emoji-ball-battles/anchor/layer.yue)

238→      radius     - corner radius
   239→      color      - packed RGBA (use rgba() helper)
   240→      line_width - outline thickness (default: 1)
   241→  ]]
   242→  rounded_rectangle_line: (x, y, w, h, radius, color, line_width) =>
   243→    layer_rounded_rectangle_line @handle, x, y, w, h, radius, color, line_width or 1
   244→
   245→  --[[
   246→    Queues an image (texture) centered at (x, y).
   247→
   248→    Usage:
   249→      layer\image an.images.player, 100, 100
   250→      layer\image an.images.player, 100, 100, rgba(255, 255, 255, 128)  -- semi-transparent
   251→      layer\image an.images.player, 100, 100, 0xFFFFFFFF, rgba(255, 0, 0, 255)  -- red flash
   252→
   253→    Parameters:
   254→      image - image object (from an\image)
   255→      x, y  - center position
   256→      color - tint/multiply color (default: white/opaque)
   257→      flash - additive flash color (default: none)
   258→
   259→    Note: Use push/pop for rotation and scaling.
   260→  ]]
   261→  image: (image, x, y, color, flash) =>
   262→    layer_draw_texture @handle, image.handle, x, y, color or 0xFFFFFFFF, flash or 0
   263→
   264→  --[[
   265→    Queues a spritesheet frame centered at (x, y).
   266→
   267→    Usage:

Edit (E:/a327ex/emoji-ball-battles/anchor/layer.yue)

The file E:/a327ex/emoji-ball-battles/anchor/layer.yue has been updated successfully.

Let me check if there are any other missing methods by comparing the engine bindings with the framework.

Grep (lua_register.*layer_)

7813:    lua_register(L, "layer_create", l_layer_create);
7814:    lua_register(L, "layer_rectangle", l_layer_rectangle);
7815:    lua_register(L, "layer_rectangle_line", l_layer_rectangle_line);
7816:    lua_register(L, "layer_rectangle_gradient_h", l_layer_rectangle_gradient_h);
7817:    lua_register(L, "layer_rectangle_gradient_v", l_layer_rectangle_gradient_v);
7818:    lua_register(L, "layer_circle", l_layer_circle);
7819:    lua_register(L, "layer_circle_line", l_layer_circle_line);
7820:    lua_register(L, "layer_line", l_layer_line);
7821:    lua_register(L, "layer_capsule", l_layer_capsule);
7822:    lua_register(L, "layer_capsule_line", l_layer_capsule_line);
7823:    lua_register(L, "layer_triangle", l_layer_triangle);
7824:    lua_register(L, "layer_triangle_line", l_layer_triangle_line);
7825:    lua_register(L, "layer_polygon", l_layer_polygon);
7826:    lua_register(L, "layer_polygon_line", l_layer_polygon_line);
7827:    lua_register(L, "layer_rounded_rectangle", l_layer_rounded_rectangle);
7828:    lua_register(L, "layer_rounded_rectangle_line", l_layer_rounded_rectangle_line);
7829:    lua_register(L, "layer_push", l_layer_push);
7830:    lua_register(L, "layer_pop", l_layer_pop);
7831:    lua_register(L, "layer_draw_texture", l_layer_draw_texture);
7832:    lua_register(L, "layer_set_blend_mode", l_layer_set_blend_mode);
7833:    lua_register(L, "layer_stencil_mask", l_layer_stencil_mask);
7834:    lua_register(L, "layer_stencil_test", l_layer_stencil_test);
7835:    lua_register(L, "layer_stencil_off", l_layer_stencil_off);
7845:    lua_register(L, "layer_draw_spritesheet_frame", l_layer_draw_spritesheet_frame);
7853:    lua_register(L, "layer_draw_text", l_layer_draw_text);
7854:    lua_register(L, "layer_draw_glyph", l_layer_draw_glyph);
7881:    lua_register(L, "layer_shader_set_float", l_layer_shader_set_float);
7882:    lua_register(L, "layer_shader_set_vec2", l_layer_shader_set_vec2);
7883:    lua_register(L, "layer_shader_set_vec4", l_layer_shader_set_vec4);
7884:    lua_register(L, "layer_shader_set_int", l_layer_shader_set_int);
... [7 more lines]

Grep (^\s+\w+:.*=>)

32:  new: (@name) =>
49:  rectangle: (x, y, w, h, color) =>
63:  circle: (x, y, radius, color) =>
79:  rectangle_line: (x, y, w, h, color, line_width) =>
95:  circle_line: (x, y, radius, color, line_width) =>
110:  line: (x1, y1, x2, y2, width, color) =>
125:  capsule: (x1, y1, x2, y2, radius, color) =>
142:  capsule_line: (x1, y1, x2, y2, radius, color, line_width) =>
157:  triangle: (x1, y1, x2, y2, x3, y3, color) =>
174:  triangle_line: (x1, y1, x2, y2, x3, y3, color, line_width) =>
195:  polygon: (vertices, color) =>
210:  polygon_line: (vertices, color, line_width) =>
225:  rounded_rectangle: (x, y, w, h, radius, color) =>
242:  rounded_rectangle_line: (x, y, w, h, radius, color, line_width) =>
257:  rectangle_gradient_h: (x, y, w, h, color1, color2) =>
272:  rectangle_gradient_v: (x, y, w, h, color1, color2) =>
291:  image: (image, x, y, color, flash) =>
311:  spritesheet: (sheet, frame, x, y, color, flash) =>
330:  animation: (animation_object, x, y, color, flash) =>
346:  text: (text, font, x, y, color) =>
370:  push: (x, y, r, sx, sy) =>
385:  pop: =>
402:  set_blend_mode: (mode) =>
420:  draw: (x, y) =>
438:  apply_shader: (shader) =>
452:  shader_set_float: (shader, name, value) =>
466:  shader_set_vec2: (shader, name, x, y) =>
480:  shader_set_vec4: (shader, name, x, y, z, w) =>
494:  shader_set_int: (shader, name, value) =>
510:  get_texture: =>
... [7 more lines]

The methods are there now. The game should work. Let me also update the Anchor framework layer.yue to include the gradient methods so future copies don't cause this issue.

Grep (rounded_rectangle_line:)

237-      w, h       - width and height
238-      radius     - corner radius
239-      color      - packed RGBA (use rgba() helper)
240-      line_width - outline thickness (default: 1)
241-  ]]
242:  rounded_rectangle_line: (x, y, w, h, radius, color, line_width) =>
243-    layer_rounded_rectangle_line @handle, x, y, w, h, radius, color, line_width or 1
244-
245-  --[[
246-    Queues an image (texture) centered at (x, y).
247-
248-    Usage:
249-      layer\image an.images.player, 100, 100
250-      layer\image an.images.player, 100, 100, rgba(255, 255, 255, 128)  -- semi-transparent
251-      layer\image an.images.player, 100, 100, 0xFFFFFFFF, rgba(255, 0, 0, 255)  -- red flash
252-

Edit (E:/a327ex/Anchor/framework/anchor/layer.yue)

The file E:/a327ex/Anchor/framework/anchor/layer.yue has been updated successfully.

Done. Both the Anchor framework and emoji-ball-battles now have the gradient methods.

Summary of stencil implementation:

The stencil feature is complete. The API in YueScript is:

layer\stencil_mask!   -- subsequent draws write to stencil only (invisible)
layer\stencil_test!   -- subsequent draws only appear where stencil is set  
layer\stencil_off!    -- disable stencil, return to normal

For the heart HP fill effect, you can now use it in the hp_ui class like:

-- Calculate filled portion (bottom of heart)
fill_ratio = @hp / max_hp
heart_h = 24
fill_h = heart_h * fill_ratio

-- Draw mask for filled region
front_3\stencil_mask!
front_3\rectangle @x - heart_h/2, @y + heart_h/2 - fill_h, heart_h, fill_h, white!

-- Draw heart with mask applied
front_3\stencil_test!
front_3\push @x, @y, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
front_3\image an.images.heart, 0, 0, nil, @flashing and white!
front_3\pop!

front_3\stencil_off!

Would you like to test it now, or should we continue with Part 6 (dagger attack speed properties)?

Let's do a simpler test. A rotating rectangle in the middle of the arena using stencil mask functions. What's expected to happen in that case?

For a simple stencil test, here's what to expect:

Test scenario: ```yuescript -- 1. Draw mask shape (invisible - goes to stencil buffer only) game\stencil_mask! game\push gw/2, gh/2, an.time, 1, 1 -- rotate over time game\rectangle -50, -25, 100, 50, white! -- rectangle centered at origin game\pop!

-- 2. Switch to test mode (only draw where stencil is set) game\stencil_test! game\rectangle 0, 0, gw, gh, red! -- full screen red rectangle

-- 3. Disable stencil game\stencil_off! ```

Expected result:

The stencil acts like a cookie cutter - the mask shape (step 1) defines WHERE things can be drawn, then anything drawn during stencil_test (step 2) only appears within that shape.

If you only did steps 1-2 without drawing anything during stencil_test, you'd see nothing (the mask itself is invisible).

OK, add this.

Grep (class arena)

226:class arena extends object
227-  new: =>
228-    super 'arena'
229-
230-    @\add object 'effects'
231-    @\add timer!

Grep (arena.update:|update:.=>.*arena)

No matches found

Grep (early_update)

400-    Speed is capped at @max_ball_speed to prevent things from getting too chaotic.
401-  ]]
402:  early_update: (dt) =>
403-    -- Background gradient (drawn early so clouds appear on top)
404-    bg\rectangle_gradient_v 0, 0, gw, gh, sky_top!, sky_bottom!
405-
406-    for event in *an\collision_begin_events 'ball', 'ball'
407-      ball_a, ball_b = event.a, event.b
408-      vx_a, vy_a = ball_a.collider\get_velocity!
409-      vx_b, vy_b = ball_b.collider\get_velocity!
410-
411-      speed_a = math.length(vx_a, vy_a)
412-      speed_b = math.length(vx_b, vy_b)
413-      max_speed = math.max(speed_a, speed_b)
414-
415-      combined_speed = speed_a + speed_b
416-
417-      -- Update wall energy boost system

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Done. I added the stencil test in the arena's early_update method, right after the background gradient.

You should see a rotating red rectangle in the center of the screen. The red color only appears within the rotating rectangle shape - the rest remains the background.

Run the game to test it.

Great, it works. Now proceed with the effect for the heart (and remove this test one)

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Now let me read the current hp_ui class and implement the heart fill effect.

Grep (class hp_ui)

1297:class hp_ui extends object
1298-  new: (team, hp) =>
1299-    super 'hp_ui'
1300-    @x = if team == 'player' then 0.2*gw else 0.8*gw
1301-    @y = 28
1302-    @hp = hp
1303-    @heart_scale = 24/512
1304-    @heart_oy = 0
1305-    @text_oy = 0
1306-    @flashing = false
1307-    @\add spring!
1308-    @spring\add 'heart', 1
1309-    @spring\add 'text', 1
1310-    @\add timer!
1311-
1312-  update: (dt) =>
1313-    -- Heart on front_3
1314-    front_3\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
1315-    front_3\image an.images.heart, 0, 0, nil, @flashing and white!
1316-    front_3\pop!
1317-    -- Text on effects (centered on heart)
1318-    text_string = tostring(@hp)
1319-    text_w = an.fonts.lana\text_width text_string
1320-    text_h = an.fonts.lana.height
1321-    effects\push @x, @y + @text_oy, 0, @spring.text.x, @spring.text.x
1322-    effects\text text_string, 'lana', -text_w/2 + 0.5, -text_h/2, white!
1323-    effects\pop!
1324-
1325-  refresh: (new_hp) =>
1326-    @hp = new_hp
... [21 more lines]

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Now let me update the ball constructor to pass max_hp.

Grep (@\add hp_ui)

1058-    @\add hp_bar!
1059-
1060-    -- HP UI (heart + number display at top of screen)
1061:    @\add hp_ui @team, @hp
1062-
1063-    -- Start ball movement after 3 seconds
1064-    @\add timer!

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Let me also make sure the text drawing is still there after stencil_off.

Read (E:/a327ex/emoji-ball-battles/main.yue)

1297→class hp_ui extends object
  1298→  new: (team, hp, max_hp) =>
  1299→    super 'hp_ui'
  1300→    @x = if team == 'player' then 0.2*gw else 0.8*gw
  1301→    @y = 28
  1302→    @hp = hp
  1303→    @max_hp = max_hp
  1304→    @heart_scale = 24/512
  1305→    @heart_size = 24
  1306→    @heart_oy = 0
  1307→    @text_oy = 0
  1308→    @flashing = false
  1309→    @\add spring!
  1310→    @spring\add 'heart', 1
  1311→    @spring\add 'text', 1
  1312→    @\add timer!
  1313→
  1314→  update: (dt) =>
  1315→    -- Calculate fill based on HP
  1316→    fill_ratio = @hp / @max_hp
  1317→    fill_h = @heart_size * fill_ratio
  1318→    heart_bottom = @y + @heart_oy + @heart_size/2
  1319→    mask_top = heart_bottom - fill_h
  1320→
  1321→    -- Draw mask rectangle (bottom portion of heart area)
  1322→    front_3\stencil_mask!
  1323→    front_3\rectangle @x - @heart_size/2, mask_top, @heart_size, fill_h, white!
  1324→
  1325→    -- Draw heart with stencil test (only visible where mask was drawn)
  1326→    front_3\stencil_test!
... [20 more lines]

The implementation is complete. The text drawing is preserved after stencil_off!.

What should happen:

Run the game to test it.

This works in the sense that the heart progressively disappears, but I'd also like to keep the outline of the original full heart, while the middle is transparent. Is there a simple way we could do that?

The simplest approach without new assets: draw the heart twice.

  1. First, draw the full heart at reduced opacity or with a gray/dark tint (the "empty" outline)
  2. Then, draw the stencil-masked filled heart on top at full color
-- Draw empty/outline heart (full, but dimmed)
front_3\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
front_3\image an.images.heart, 0, 0, rgba(255, 255, 255, 80)  -- 30% opacity
front_3\pop!

-- Draw filled portion with stencil
front_3\stencil_mask!
front_3\rectangle @x - @heart_size/2, mask_top, @heart_size, fill_h, white!
front_3\stencil_test!
front_3\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
front_3\image an.images.heart, 0, 0, nil, @flashing and white!
front_3\pop!
front_3\stencil_off!

The dimmed heart shows the full shape, the filled heart on top shows the current HP. Want me to implement this?

You mean that the dimmed heart will still be picked up by the outline shader as long as it's not alpha = 0?

Yes, exactly. The outline shader uses edge detection (Sobel) which detects alpha boundaries. As long as the dimmed heart has alpha > 0, it will produce an outline. So you'd see:

The dimmed inner portion would be barely visible (or you could make it more visible if you want to see the "empty" interior), but the outline would be fully intact.

Want me to implement it?

OK, then it should be 1 instead of 80, since we want it as invisible as possible.

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Done. Now you'll see:

Run the game to test it.

The way it's currently there is picked up by the outline shader, but it's fully black instead of just the outline.

The issue is that the outline shader fills the entire shape with black, not just the edges. The alpha=25 heart is being treated as a solid shape by the outline shader.

A few options:

  1. Create a heart_outline.png - An actual outline-only image of the heart. Draw this at full opacity, it would just be the stroke/border of the heart shape.

  2. Draw on a layer without outline shader - Like front_2 which doesn't have outline processing. But then you'd get no outline at all.

  3. Use the stencil inversely - Draw the filled heart first, then use stencil to draw ONLY the border ring of the empty portion. This is more complex.

Option 1 (heart outline image) is probably the cleanest solution. Do you have or want to create a heart outline asset, or would you prefer a different approach?

I added a hastily made heart_outline file, let's test it. It's black and contains only the outline.

Grep (an\image 'heart')

88-
89--- UI images
90:an\image 'heart', 'assets/heart.png'
91-
92--- Fonts

Edit (E:/a327ex/emoji-ball-battles/main.yue)

<tool_use_error>File has been modified since read, either by the user or by a linter. Read it again before attempting to write it.</tool_use_error>

Read (E:/a327ex/emoji-ball-battles/main.yue)

88→
    89→-- UI images
    90→an\image 'heart', 'assets/heart.png'
    91→
    92→-- Fonts
    93→an\font 'fat', 'assets/FatPixelFont.ttf', 8
    94→an\font 'lana', 'assets/LanaPixel.ttf', 11
    95→
    96→-- Spritesheets
    97→an\spritesheet 'hit1', 'assets/hit1.png', 96, 48

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Now let me update hp_ui to use the outline image.

Read (E:/a327ex/emoji-ball-battles/main.yue)

1314→
  1315→  update: (dt) =>
  1316→    -- Calculate fill based on HP
  1317→    fill_ratio = @hp / @max_hp
  1318→    fill_h = @heart_size * fill_ratio
  1319→    heart_bottom = @y + @heart_oy + @heart_size/2
  1320→    mask_top = heart_bottom - fill_h
  1321→
  1322→    -- Draw empty heart outline (nearly invisible, but outline shader picks it up)
  1323→    front\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  1324→    front\image an.images.heart, 0, 0, rgba(255, 255, 255, 25)
  1325→    front\pop!
  1326→
  1327→    -- Draw mask rectangle (bottom portion of heart area)
  1328→    front_3\stencil_mask!
  1329→    front_3\rectangle @x - @heart_size/2, mask_top, @heart_size, fill_h, white!
  1330→
  1331→    -- Draw filled heart with stencil test (only visible where mask was drawn)
  1332→    front_3\stencil_test!
  1333→    front_3\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  1334→    front_3\image an.images.heart, 0, 0, nil, @flashing and white!
  1335→    front_3\pop!
  1336→
  1337→    front_3\stencil_off!
  1338→    -- Text on effects (centered on heart)
  1339→    text_string = tostring(@hp)
  1340→    text_w = an.fonts.lana\text_width text_string
  1341→    text_h = an.fonts.lana.height
  1342→    effects\push @x, @y + @text_oy, 0, @spring.text.x, @spring.text.x
  1343→    effects\text text_string, 'lana', -text_w/2 + 0.5, -text_h/2, white!

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Done. Now it draws:

  1. The black heart outline (always visible)
  2. The filled heart on top (stencil-masked based on HP)

Run the game to test it.

This doesn't quite work either...

What are you seeing? Is it:

Can we create another outline shader specifically for this purpose that only draws the actual outline instead of everything as black? So only transparent pixels near non-transparent ones are drawn.

Yes, we can create an outline-only shader. It would:

  1. Check if current pixel is transparent
  2. Check if any neighboring pixel is non-transparent
  3. If yes (edge pixel), draw black; otherwise draw transparent

Let me create this shader.

Read (E:/a327ex/emoji-ball-battles/assets/outline.frag)

1→// Outline shader - samples neighbors to detect alpha edges
     2→// Outputs black where any neighbor has alpha, creating silhouette outline
     3→in vec2 TexCoord;
     4→out vec4 FragColor;
     5→uniform sampler2D u_texture;
     6→uniform vec2 u_pixel_size;
     7→
     8→void main() {
     9→    // Sample center pixel
    10→    vec4 center = texture(u_texture, TexCoord);
    11→
    12→    // Sample 24 neighbors in 5x5 grid (excluding center)
    13→    float x = u_pixel_size.x;
    14→    float y = u_pixel_size.y;
    15→
    16→    float a = 0.0;
    17→    // Row -2
    18→    a += texture(u_texture, TexCoord + vec2(-2.0*x, -2.0*y)).a;
    19→    a += texture(u_texture, TexCoord + vec2(-1.0*x, -2.0*y)).a;
    20→    a += texture(u_texture, TexCoord + vec2( 0.0,   -2.0*y)).a;
    21→    a += texture(u_texture, TexCoord + vec2( 1.0*x, -2.0*y)).a;
    22→    a += texture(u_texture, TexCoord + vec2( 2.0*x, -2.0*y)).a;
    23→    // Row -1
    24→    a += texture(u_texture, TexCoord + vec2(-2.0*x, -1.0*y)).a;
    25→    a += texture(u_texture, TexCoord + vec2(-1.0*x, -1.0*y)).a;
    26→    a += texture(u_texture, TexCoord + vec2( 0.0,   -1.0*y)).a;
    27→    a += texture(u_texture, TexCoord + vec2( 1.0*x, -1.0*y)).a;
    28→    a += texture(u_texture, TexCoord + vec2( 2.0*x, -1.0*y)).a;
    29→    // Row 0 (skip center)
    30→    a += texture(u_texture, TexCoord + vec2(-2.0*x,  0.0)).a;
... [25 more lines]

Write (E:/a327ex/emoji-ball-battles/assets/outline_only.frag)

File created successfully at: E:/a327ex/emoji-ball-battles/assets/outline_only.frag

Now let me load the shader in main.yue and set up a layer for it.

Read (E:/a327ex/emoji-ball-battles/main.yue)

60→-- Shaders
    61→an\shader 'shadow', 'assets/shadow.frag'
    62→an\shader 'outline', 'assets/outline.frag'
    63→
    64→-- Images
    65→an\image 'slight_smile', 'assets/slight_smile.png'
    66→an\image 'no_mouth', 'assets/no_mouth.png'
    67→an\image 'dagger', 'assets/dagger.png'
    68→an\image 'gun', 'assets/gun.png'
    69→an\image 'gun', 'assets/gun.png'
    70→an\image 'boom', 'assets/boom.png'
    71→an\image 'star', 'assets/star.png'
    72→an\image 'dash', 'assets/dash.png'
    73→
    74→-- Plant images

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Read (E:/a327ex/emoji-ball-battles/main.yue)

38→-- Layers
    39→bg = an\layer 'bg'
    40→back = an\layer 'back'
    41→back_outline = an\layer 'back_outline'
    42→game = an\layer 'game'
    43→game_outline = an\layer 'game_outline'
    44→front = an\layer 'front'
    45→front_outline = an\layer 'front_outline'
    46→front_2 = an\layer 'front_2' -- wall only
    47→front_3 = an\layer 'front_3'
    48→front_3_outline = an\layer 'front_3_outline'
    49→effects = an\layer 'effects'
    50→effects_outline = an\layer 'effects_outline'
    51→ui = an\layer 'ui'
    52→ui_outline = an\layer 'ui_outline'
    53→shadow = an\layer 'shadow'
    54→debug_draw = an\layer 'debug_draw'
    55→
    56→-- UI layers don't use camera (no shake)
    57→ui.camera = nil
    58→ui_outline.camera = nil
    59→

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

Now I need to update hp_ui to use this. The tricky part is that shader application normally happens in the draw phase. Let me update hp_ui to render the heart outline inline.

Read (E:/a327ex/emoji-ball-battles/main.yue)

1315→    @\add timer!
  1316→
  1317→  update: (dt) =>
  1318→    -- Calculate fill based on HP
  1319→    fill_ratio = @hp / @max_hp
  1320→    fill_h = @heart_size * fill_ratio
  1321→    heart_bottom = @y + @heart_oy + @heart_size/2
  1322→    mask_top = heart_bottom - fill_h
  1323→
  1324→    --[[
  1325→    -- Draw heart outline (black outline image)
  1326→    front_3\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  1327→    front_3\image an.images.heart_outline, 0, 0
  1328→    front_3\pop!
  1329→    ]]
  1330→
  1331→    -- Draw mask rectangle (bottom portion of heart area)
  1332→    front_3\stencil_mask!
  1333→    front_3\rectangle @x - @heart_size/2, mask_top, @heart_size, fill_h, white!
  1334→
  1335→    -- Draw filled heart with stencil test (only visible where mask was drawn)
  1336→    front_3\stencil_test!
  1337→    front_3\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  1338→    front_3\image an.images.heart, 0, 0, nil, @flashing and white!
  1339→    front_3\pop!
  1340→
  1341→    front_3\stencil_off!
  1342→    -- Text on effects (centered on heart)
  1343→    text_string = tostring(@hp)
  1344→    text_w = an.fonts.lana\text_width text_string
... [5 more lines]

Edit (E:/a327ex/emoji-ball-battles/main.yue)

The file E:/a327ex/emoji-ball-battles/main.yue has been updated successfully.

No, you're overcomplicating it, just draw normally to a new layer as every other layer does and it will come out right.

This session is being continued from a previous conversation that ran out of context. The summary below covers the earlier portion of the conversation.

Analysis: Let me chronologically analyze the conversation to capture all important details:

  1. Initial Request: The user wanted to work on Emoji Ball Battles, specifically:

    • Implement temporary basic UI showing each ball's HP at the top with heart emoji and big font
    • Add weapon effect descriptions
    • Dagger mechanic: every hit increases base spin velocity ("attack speed")
    • Revolver mechanic: every hit decreases cooldown and spread
  2. Research Phase: I researched the codebase and found:

    • Reference games with heart HP display patterns
    • Existing damage_number class using digit sprites
    • Font support available (FatPixelFont, LanaPixel)
    • No heart.png in assets (needed to copy from reference)
  3. Implementation Plan was created with 12 parts

  4. Part 1: Copied heart.png from reference folder to assets

  5. Part 2: Added image/font loading - user corrected font sizes (lana should be 11, fat should be 8)

  6. Part 3: Created hp_ui - user gave several corrections:

    • Should be inline object first, then converted to class
    • No vertical bounce initially, text centered on heart
    • Should use camera-moving layers (front_3, effects), not UI layer
    • Springs for heart and text with different bounce
    • User later asked to convert inline object to actual class
  7. HP UI refinements:

    • Added vertical bounce and white flash
    • User wanted heart to progressively unfill as HP decreases
  8. Stencil Implementation:

    • User asked about scissor/stencil for HP fill effect
    • Discussed scissor (axis-aligned only, won't work with camera rotation)
    • Decided on stencil approach for arbitrary shape masking
    • Implemented full stencil system in engine:
      • Added COMMAND_STENCIL_MASK, COMMAND_STENCIL_TEST, COMMAND_STENCIL_OFF
      • Added stencil renderbuffer to FBOs
      • Added Lua bindings and YueScript wrappers
    • Tested with rotating rectangle - worked
  9. Heart HP fill with stencil:

    • Implemented stencil-based heart fill
    • User wanted outline of full heart visible while inside drains
    • Tried alpha=1 heart for outline shader pickup - didn't work (fully black)
    • User added heart_outline.png - didn't quite work
    • User then asked for outline_only shader that only draws actual outline
  10. Current issue: I overcomplicated the outline_only shader approach with inline rendering. User said to just draw normally to a new layer.

Key files modified: - E:/a327ex/Anchor/engine/src/anchor.c (stencil support) - E:/a327ex/Anchor/framework/anchor/layer.yue (stencil methods, gradient methods) - E:/a327ex/emoji-ball-battles/main.yue (hp_ui class, assets) - E:/a327ex/emoji-ball-battles/assets/outline_only.frag (new shader)

Errors encountered: - Missing rectangle_gradient_v wrapper after copying layer.yue - Heart outline approaches didn't work as expected - Overcomplicated the outline_only shader usage

Summary: 1. Primary Request and Intent: The user wants to finish the action arena portion of Emoji Ball Battles by implementing: - HP UI: Show each ball's HP at the top with a big heart emoji and a number displaying current HP centered on it - Heart fill effect: Heart should progressively empty as HP decreases, with outline always visible - Weapon descriptions: Text explaining each weapon's passive effect (planned but not yet implemented) - Dagger mechanic: Every hit increases base spin velocity ("attack speed") - planned but not yet implemented - Revolver mechanic: Every hit decreases cooldown and spread - planned but not yet implemented

  1. Key Technical Concepts:

    • Stencil buffer for arbitrary shape masking (implemented in engine)
    • Layer-based rendering with command queuing
    • Outline shaders for edge detection
    • Spring-based animation feedback
    • Inline objects vs class definitions in YueScript
    • FBO (Framebuffer Object) with stencil attachment
  2. Files and Code Sections:

    • E:/a327ex/Anchor/engine/src/anchor.c

      • Added stencil support to the engine
      • Added GLuint stencil_rbo to Layer struct
      • Added GL_DEPTH24_STENCIL8 renderbuffer to FBOs
      • Added command types: COMMAND_STENCIL_MASK, COMMAND_STENCIL_TEST, COMMAND_STENCIL_OFF
      • Added layer_stencil_mask(), layer_stencil_test(), layer_stencil_off() functions
      • Added Lua bindings and registration
    • E:/a327ex/Anchor/framework/anchor/layer.yue

      • Added stencil wrapper methods and gradient rectangle methods yuescript stencil_mask: => layer_stencil_mask @handle stencil_test: => layer_stencil_test @handle stencil_off: => layer_stencil_off @handle rectangle_gradient_h: (x, y, w, h, color1, color2) => layer_rectangle_gradient_h @handle, x, y, w, h, color1, color2 rectangle_gradient_v: (x, y, w, h, color1, color2) => layer_rectangle_gradient_v @handle, x, y, w, h, color1, color2
    • E:/a327ex/emoji-ball-battles/main.yue

      • Added heart and heart_outline images, fonts, outline_only shader, heart_temp layer
      • hp_ui class (current state after user modifications): yuescript class hp_ui extends object new: (team, hp, max_hp) => super 'hp_ui' @x = if team == 'player' then 0.2*gw else 0.8*gw @y = 28 @hp = hp - 50 -- user testing offset @max_hp = max_hp @heart_scale = 24/512 @heart_size = 24 @heart_oy = 0 @text_oy = 0 @flashing = false @\add spring! @spring\add 'heart', 1 @spring\add 'text', 1 @\add timer!
    • E:/a327ex/emoji-ball-battles/assets/outline_only.frag

      • New shader that only draws edges (transparent pixels next to non-transparent) ```glsl // Outline-only shader - draws black only at edges in vec2 TexCoord; out vec4 FragColor; uniform sampler2D u_texture; uniform vec2 u_pixel_size;

      void main() { vec4 center = texture(u_texture, TexCoord); if (center.a > 0.1) { FragColor = vec4(0.0, 0.0, 0.0, 0.0); return; } // Check 8 neighbors for edge detection // If any neighbor has alpha, draw black } ```

  3. Errors and fixes:

    • Missing rectangle_gradient_v wrapper: After copying layer.yue from Anchor to emoji-ball-battles, the gradient methods were missing. Fixed by adding the wrapper methods to both files.
    • Heart outline showing fully black: Tried using alpha=1/25 heart to trigger outline shader - didn't work as expected because outline shader fills entire shape. User suggested creating outline_only shader.
    • Heart_outline.png approach: User added a black outline image but it "didn't quite work either"
    • Overcomplicated inline rendering: I tried to render/apply shader/draw_from inline in hp_ui update method. User said: "No, you're overcomplicating it, just draw normally to a new layer as every other layer does and it will come out right."
  4. Problem Solving:

    • Stencil implementation completed and tested successfully with rotating rectangle
    • Heart HP fill with stencil works (heart progressively disappears based on HP)
    • Outstanding: Need to properly show heart outline while filled portion drains
    • The outline_only shader was created but not yet properly integrated
  5. All user messages:

    • Initial request about HP UI, weapon descriptions, and mechanics
    • "Yes, this is correct." (confirming heart.png copy)
    • "lana should be 11, check if fat is that size in reference games too"
    • "Yes." (confirming font sizes)
    • Corrections about hp_ui: no vertical bounce, text centered on heart, use camera-moving layers
    • "object! should be object 'hp_ui' otherwise we won't be able to refer to it as @hp_ui"
    • "Draw position should be slightly below and to the right/left respectively. Text is not drawing centered on the heart"
    • "Yes, you're correct." (about position adjustments)
    • "We need to do more work on the HP UI, but I'll do some of it myself... create an actual hp_ui class below hp_bar"
    • Request for vertical bounce, flash, and progressive heart unfill
    • Discussion about scissor vs stencil approaches
    • "Yes." (to implement stencil)
    • "Let's do a simpler test. A rotating rectangle in the middle of the arena using stencil mask functions."
    • "OK, add this." (the test)
    • "Great, it works. Now proceed with the effect for the heart (and remove this test one)"
    • "This works in the sense that the heart progressively disappears, but I'd also like to keep the outline of the original full heart"
    • "You mean that the dimmed heart will still be picked up by the outline shader as long as it's not alpha = 0?"
    • "OK, then it should be 1 instead of 80, since we want it as invisible as possible."
    • "The way it's currently there is picked up by the outline shader, but it's fully black instead of just the outline."
    • "Can we create another outline shader specifically for this purpose that only draws the actual outline instead of everything as black?"
    • "I added a hastily made heart_outline file, let's test it. It's black and contains only the outline."
    • "This doesn't quite work either..."
    • "No, you're overcomplicating it, just draw normally to a new layer as every other layer does and it will come out right."
  6. Pending Tasks:

    • Fix heart outline display (current task - use outline_only shader properly with dedicated layer)
    • Add weapon description text below HP display
    • Implement dagger attack speed mechanic (Part 6-8 of original plan)
    • Implement revolver cooldown/spread mechanic (Part 9-11 of original plan)
  7. Current Work: Working on displaying heart outline while HP fill portion drains. Created outline_only.frag shader and heart_temp layer. The user's last feedback was that I overcomplicated the approach by trying to do inline render/apply_shader/draw_from in the hp_ui update method. User said to "just draw normally to a new layer as every other layer does."

    Current hp_ui update method has overcomplicated code: yuescript -- Draw heart outline using outline_only shader heart_temp\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x heart_temp\image an.images.heart, 0, 0 heart_temp\pop! heart_temp\render! shader_set_vec2_immediate an.shaders.outline_only, 'u_pixel_size', 1/gw, 1/gh heart_temp\apply_shader an.shaders.outline_only front_3\draw_from heart_temp heart_temp\clear!

  8. Optional Next Step: Simplify the heart outline approach: Draw the heart normally to heart_temp layer (just queue the draw command), then in the main draw function, render heart_temp, apply outline_only shader, and composite to front_3 - following the same pattern as other layers like shadow and outline layers in the existing codebase.

    User's exact feedback: "No, you're overcomplicating it, just draw normally to a new layer as every other layer does and it will come out right."

If you need specific details from before compaction (like exact code snippets, error messages, or content you generated), read the full transcript at: C:\Users\adn.claude\projects\E--a327ex\df1e3a58-b94e-4014-ad19-8979b3a32e7c.jsonl Please continue the conversation from where we left it off without asking the user any further questions. Continue with the last task that you were asked to work on.

Let me read the current main.yue to understand how other layers handle the render/apply_shader/draw_from pattern and fix the hp_ui accordingly.

Read (E:\a327ex\emoji-ball-battles\main.yue)

1→global *
     2→
     3→require('anchor')
     4→  width: 480
     5→  height: 270
     6→  scale: 3
     7→
     8→-- Game dimensions
     9→gw, gh = an.width, an.height
    10→
    11→-- Twitter emoji color palette
    12→white = color 255, 255, 255
    13→black = color 0, 0, 0
    14→gray = color 128, 128, 128
    15→bg_color = color 48, 49, 50
    16→fg = color 231, 232, 233
    17→fg_dark = color 201, 202, 203
    18→yellow = color 253, 205, 86
    19→star_yellow = color 255, 172, 51
    20→orange = color 244, 146, 0
    21→blue = color 83, 175, 239
    22→green = color 122, 179, 87
    23→red = color 223, 37, 64
    24→purple = color 172, 144, 216
    25→brown = color 195, 105, 77
    26→wall_color = fg\clone!\mix yellow, 0.1
    27→
    28→-- Sky colors (subtle blue gradient)
    29→sky_top = color 135, 206, 235     -- light sky blue
    30→sky_bottom = color 231, 232, 233  -- same as fg (off-white)
... [1808 more lines]

I see the pattern now. Looking at the draw function (lines 176-223), outline layers like back_outline, game_outline, etc. are handled by:

  1. Clear the layer
  2. Draw from source layer with shader
  3. Draw in the composite order

I need to:

  1. In hp_ui update, draw the full heart to heart_temp layer (just queue the draw command)
  2. In the main draw function, render heart_temp, apply outline_only shader, and composite it properly

Let me update the code.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Now I need to add the heart_temp processing in the main draw function, similar to how other outline layers are handled.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Now I need to add heart_temp to the composite draw order. It should be drawn before front_3 so the outline appears behind the filled heart.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Let me build to check for errors.

Bash (cd E:/a327ex/emoji-ball-battles && ./run.bat 2>&1 | head -50)

Exit code 137
[Request interrupted by user for tool use]

The way I did it now is correct, check my work. However, the outline_only shader is still drawing the full solid red pixels of the heart, instead of just the black outline.

Let me read the outline_only shader to check the logic.

Read (E:\a327ex\emoji-ball-battles\assets\outline_only.frag)

1→// Outline-only shader - draws black only at edges (transparent pixels next to non-transparent)
     2→// Unlike regular outline shader, this doesn't fill the interior
     3→in vec2 TexCoord;
     4→out vec4 FragColor;
     5→uniform sampler2D u_texture;
     6→uniform vec2 u_pixel_size;
     7→
     8→void main() {
     9→    // Sample center pixel
    10→    vec4 center = texture(u_texture, TexCoord);
    11→
    12→    // If center pixel is not transparent, output nothing (don't fill interior)
    13→    if (center.a > 0.1) {
    14→        FragColor = vec4(0.0, 0.0, 0.0, 0.0);
    15→        return;
    16→    }
    17→
    18→    // Center is transparent - check if any neighbor is non-transparent
    19→    float x = u_pixel_size.x;
    20→    float y = u_pixel_size.y;
    21→
    22→    float neighbor_alpha = 0.0;
    23→
    24→    // Sample 8 immediate neighbors (3x3 grid excluding center)
    25→    neighbor_alpha += texture(u_texture, TexCoord + vec2(-x, -y)).a;
    26→    neighbor_alpha += texture(u_texture, TexCoord + vec2( 0, -y)).a;
    27→    neighbor_alpha += texture(u_texture, TexCoord + vec2( x, -y)).a;
    28→    neighbor_alpha += texture(u_texture, TexCoord + vec2(-x,  0)).a;
    29→    neighbor_alpha += texture(u_texture, TexCoord + vec2( x,  0)).a;
    30→    neighbor_alpha += texture(u_texture, TexCoord + vec2(-x,  y)).a;
... [11 more lines]

I see - the shader logic looks correct, but it seems apply_shader isn't working as expected. Let me follow the same pattern as other outline layers - use draw_from with the shader to a separate layer. I'll create a heart_outline layer and use draw_from like the other outline layers do.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

<tool_use_error>File has been modified since read, either by the user or by a linter. Read it again before attempting to write it.</tool_use_error>

Read (E:\a327ex\emoji-ball-battles\main.yue)

1→global *
     2→
     3→require('anchor')
     4→  width: 480
     5→  height: 270
     6→  scale: 3
     7→
     8→-- Game dimensions
     9→gw, gh = an.width, an.height
    10→
    11→-- Twitter emoji color palette
    12→white = color 255, 255, 255
    13→black = color 0, 0, 0
    14→gray = color 128, 128, 128
    15→bg_color = color 48, 49, 50
    16→fg = color 231, 232, 233
    17→fg_dark = color 201, 202, 203
    18→yellow = color 253, 205, 86
    19→star_yellow = color 255, 172, 51
    20→orange = color 244, 146, 0
    21→blue = color 83, 175, 239
    22→green = color 122, 179, 87
    23→red = color 223, 37, 64
    24→purple = color 172, 144, 216
    25→brown = color 195, 105, 77
    26→wall_color = fg\clone!\mix yellow, 0.1
    27→
    28→-- Sky colors (subtle blue gradient)
    29→sky_top = color 135, 206, 235     -- light sky blue
    30→sky_bottom = color 231, 232, 233  -- same as fg (off-white)
... [70 more lines]

Read (E:\a327ex\emoji-ball-battles\main.yue)

175→
   176→-- Render and composite layers
   177→draw = ->
   178→  bg\render!
   179→  back\render!
   180→  game\render!
   181→  front\render!
   182→  front_2\render!
   183→  front_3\render!
   184→  front_4\render!
   185→  effects\render!
   186→  ui\render!
   187→  debug_draw\render!
   188→
   189→  shadow\clear!
   190→  shadow\draw_from back, an.shaders.shadow
   191→  shadow\draw_from game, an.shaders.shadow
   192→  shadow\draw_from front, an.shaders.shadow
   193→  shadow\draw_from front_3, an.shaders.shadow
   194→  shadow\draw_from effects, an.shaders.shadow
   195→
   196→  shader_set_vec2_immediate an.shaders.outline, "u_pixel_size", 1/gw, 1/gh
   197→  back_outline\clear!
   198→  back_outline\draw_from back, an.shaders.outline
   199→  game_outline\clear!
   200→  game_outline\draw_from game, an.shaders.outline
   201→  front_outline\clear!
   202→  front_outline\draw_from front, an.shaders.outline
   203→  front_3_outline\clear!
   204→  front_3_outline\draw_from front_3, an.shaders.outline
... [50 more lines]

I already did that.

I see the issue - line 212 uses an.shaders.outline instead of an.shaders.outline_only:

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

That should fix it - it was using the regular outline shader which fills the interior, instead of outline_only which only draws edges.

This is drawing a different outline, definitely (I believe the one in your shader has different thickness as the one in the other shader), but it's still drawing the red pixels of the heart.

I see the issue - front_4 is being drawn after front_4_outline, which draws the filled heart on top of the outline. Since front_4 is only used as a source for the outline shader, it shouldn't be drawn itself.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Now front_4 is only used as a source for the outline shader and gets cleared instead of drawn. Only the outline from front_4_outline will be visible.

Yes, this looks more correct, can you now increase the thickness of the outline_only shader to match the other?

Let me check the regular outline shader to see how it handles thickness.

Read (E:\a327ex\emoji-ball-battles\assets\outline.frag)

1→// Outline shader - samples neighbors to detect alpha edges
     2→// Outputs black where any neighbor has alpha, creating silhouette outline
     3→in vec2 TexCoord;
     4→out vec4 FragColor;
     5→uniform sampler2D u_texture;
     6→uniform vec2 u_pixel_size;
     7→
     8→void main() {
     9→    // Sample center pixel
    10→    vec4 center = texture(u_texture, TexCoord);
    11→
    12→    // Sample 24 neighbors in 5x5 grid (excluding center)
    13→    float x = u_pixel_size.x;
    14→    float y = u_pixel_size.y;
    15→
    16→    float a = 0.0;
    17→    // Row -2
    18→    a += texture(u_texture, TexCoord + vec2(-2.0*x, -2.0*y)).a;
    19→    a += texture(u_texture, TexCoord + vec2(-1.0*x, -2.0*y)).a;
    20→    a += texture(u_texture, TexCoord + vec2( 0.0,   -2.0*y)).a;
    21→    a += texture(u_texture, TexCoord + vec2( 1.0*x, -2.0*y)).a;
    22→    a += texture(u_texture, TexCoord + vec2( 2.0*x, -2.0*y)).a;
    23→    // Row -1
    24→    a += texture(u_texture, TexCoord + vec2(-2.0*x, -1.0*y)).a;
    25→    a += texture(u_texture, TexCoord + vec2(-1.0*x, -1.0*y)).a;
    26→    a += texture(u_texture, TexCoord + vec2( 0.0,   -1.0*y)).a;
    27→    a += texture(u_texture, TexCoord + vec2( 1.0*x, -1.0*y)).a;
    28→    a += texture(u_texture, TexCoord + vec2( 2.0*x, -1.0*y)).a;
    29→    // Row 0 (skip center)
    30→    a += texture(u_texture, TexCoord + vec2(-2.0*x,  0.0)).a;
... [25 more lines]

The regular outline shader uses a 5x5 grid (24 neighbors) while outline_only uses 3x3 (8 neighbors). Let me update it to match.

Edit (E:\a327ex\emoji-ball-battles\assets\outline_only.frag)

The file E:\a327ex\emoji-ball-battles\assets\outline_only.frag has been updated successfully.

Now the outline_only shader uses the same 5x5 sampling grid as the regular outline shader, so the thickness should match.

Perfect. The layer naming is getting a little confusing. Analyzing the codebase and how all layers are used, especially the front ones, which new naming would you suggest?

Let me look at how each layer is actually used to suggest clearer names.

Grep (front_2\|front_3\|front_4)

49:front_4 = an\layer 'front_4'
50:front_4_outline = an\layer 'front_4_outline'
182:  front_2\render!
183:  front_3\render!
184:  front_4\render!
211:  front_4_outline\clear!
212:  front_4_outline\draw_from front_4, an.shaders.outline_only
222:  front_2\draw!
224:  front_3\draw!
225:  front_4_outline\draw!
226:  front_4\clear!
1169:    front_3\push weapon_x, weapon_y, @angle + @weapon_rotation_offset + @weapon_recoil, @weapon_scale*weapon_spring, @weapon_scale_y*weapon_spring
1170:    front_3\image @weapon_image, 0, 0, nil, @weapon_flashing and white!
1171:    front_3\pop!
1332:    front_4\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
1333:    front_4\image an.images.heart, 0, 0
1334:    front_4\pop!
1337:    front_2\stencil_mask!
1338:    front_2\rectangle @x - @heart_size/2, mask_top, @heart_size, fill_h, white!
1341:    front_2\stencil_test!
1342:    front_2\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
1343:    front_2\image an.images.heart, 0, 0, nil, @flashing and white!
1344:    front_2\pop!
1346:    front_2\stencil_off!
1846:      front_2\rectangle @x - @w/2, @y - @h/2, @w, @h, @color

Based on the usage:

Current Used For Suggested Name
back Plants behind balls back (fine)
game Balls, walls, projectiles game (fine)
front Plants in front of balls front (fine)
front_2 Floor cover (hides plant roots) + stenciled heart fill Split into ground and heart_fill, or just ground
front_3 Weapons (dagger, gun) weapons
front_3_outline Weapon outlines weapons_outline
front_4 Full heart (source for outline, never drawn) heart_source
front_4_outline Heart outline only heart_outline

However, I notice front_2 is doing double duty - both the floor cover (wall class line 1846) and the stenciled heart (hp_ui lines 1337-1346). These might be better separated.

Suggested rename:

The numbered names give no hint about contents, while weapons, heart_source, heart_outline are self-documenting.

Let's do front_2 -> cover, front_3 -> weapons, front_4 -> outline_only, and the other actual_outline_only, should be a comment explaining that "outline_only" never gets drawn itself, just the outline in actual_outline_only.

Read (E:\a327ex\emoji-ball-battles\main.yue)

1→global *
     2→
     3→require('anchor')
     4→  width: 480
     5→  height: 270
     6→  scale: 3
     7→
     8→-- Game dimensions
     9→gw, gh = an.width, an.height
    10→
    11→-- Twitter emoji color palette
    12→white = color 255, 255, 255
    13→black = color 0, 0, 0
    14→gray = color 128, 128, 128
    15→bg_color = color 48, 49, 50
    16→fg = color 231, 232, 233
    17→fg_dark = color 201, 202, 203
    18→yellow = color 253, 205, 86
    19→star_yellow = color 255, 172, 51
    20→orange = color 244, 146, 0
    21→blue = color 83, 175, 239
    22→green = color 122, 179, 87
    23→red = color 223, 37, 64
    24→purple = color 172, 144, 216
    25→brown = color 195, 105, 77
    26→wall_color = fg\clone!\mix yellow, 0.1
    27→
    28→-- Sky colors (subtle blue gradient)
    29→sky_top = color 135, 206, 235     -- light sky blue
    30→sky_bottom = color 231, 232, 233  -- same as fg (off-white)
... [30 more lines]

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Now let me replace all usages throughout the file.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated. All occurrences of 'front_2\' were successfully replaced with 'cover\'.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated. All occurrences of 'front_3_outline\' were successfully replaced with 'weapons_outline\'.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated. All occurrences of 'front_3\' were successfully replaced with 'weapons\'.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated. All occurrences of 'front_4_outline\' were successfully replaced with 'actual_outline_only\'.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated. All occurrences of 'front_4\' were successfully replaced with 'outline_only\'.

Let me verify the changes look correct in the draw function.

Read (E:\a327ex\emoji-ball-battles\main.yue)

175→
   176→-- Render and composite layers
   177→draw = ->
   178→  bg\render!
   179→  back\render!
   180→  game\render!
   181→  front\render!
   182→  cover\render!
   183→  weapons\render!
   184→  outline_only\render!
   185→  effects\render!
   186→  ui\render!
   187→  debug_draw\render!
   188→
   189→  shadow\clear!
   190→  shadow\draw_from back, an.shaders.shadow
   191→  shadow\draw_from game, an.shaders.shadow
   192→  shadow\draw_from front, an.shaders.shadow
   193→  shadow\draw_from front_3, an.shaders.shadow
   194→  shadow\draw_from effects, an.shaders.shadow
   195→
   196→  shader_set_vec2_immediate an.shaders.outline, "u_pixel_size", 1/gw, 1/gh
   197→  back_outline\clear!
   198→  back_outline\draw_from back, an.shaders.outline
   199→  game_outline\clear!
   200→  game_outline\draw_from game, an.shaders.outline
   201→  front_outline\clear!
   202→  front_outline\draw_from front, an.shaders.outline
   203→  weapons_outline\clear!
   204→  weapons_outline\draw_from front_3, an.shaders.outline
... [30 more lines]

I see there are still some old references without backslashes. Let me fix those.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Let me verify it all looks correct now.

Read (E:\a327ex\emoji-ball-battles\main.yue)

175→
   176→-- Render and composite layers
   177→draw = ->
   178→  bg\render!
   179→  back\render!
   180→  game\render!
   181→  front\render!
   182→  cover\render!
   183→  weapons\render!
   184→  outline_only\render!
   185→  effects\render!
   186→  ui\render!
   187→  debug_draw\render!
   188→
   189→  shadow\clear!
   190→  shadow\draw_from back, an.shaders.shadow
   191→  shadow\draw_from game, an.shaders.shadow
   192→  shadow\draw_from front, an.shaders.shadow
   193→  shadow\draw_from weapons, an.shaders.shadow
   194→  shadow\draw_from effects, an.shaders.shadow
   195→
   196→  shader_set_vec2_immediate an.shaders.outline, "u_pixel_size", 1/gw, 1/gh
   197→  back_outline\clear!
   198→  back_outline\draw_from back, an.shaders.outline
   199→  game_outline\clear!
   200→  game_outline\draw_from game, an.shaders.outline
   201→  front_outline\clear!
   202→  front_outline\draw_from front, an.shaders.outline
   203→  weapons_outline\clear!
   204→  weapons_outline\draw_from weapons, an.shaders.outline
... [30 more lines]

The draw function looks correct. Let me also verify the layer definitions and check the hp_ui class.

Read (E:\a327ex\emoji-ball-battles\main.yue)

38→-- Layers
    39→bg = an\layer 'bg'
    40→back = an\layer 'back'
    41→back_outline = an\layer 'back_outline'
    42→game = an\layer 'game'
    43→game_outline = an\layer 'game_outline'
    44→front = an\layer 'front'
    45→front_outline = an\layer 'front_outline'
    46→cover = an\layer 'cover'
    47→weapons = an\layer 'weapons'
    48→weapons_outline = an\layer 'weapons_outline'
    49→outline_only = an\layer 'outline_only' -- source layer for outline_only shader, never drawn itself
    50→actual_outline_only = an\layer 'actual_outline_only' -- result of outline_only shader
    51→effects = an\layer 'effects'
    52→effects_outline = an\layer 'effects_outline'
    53→ui = an\layer 'ui'
    54→ui_outline = an\layer 'ui_outline'
    55→shadow = an\layer 'shadow'
    56→debug_draw = an\layer 'debug_draw'
    57→
    58→-- UI layers don't use camera (no shake)
    59→ui.camera = nil
    60→ui_outline.camera = nil
    61→
    62→-- Shaders

Grep (front_)

45:front_outline = an\layer 'front_outline'
201:  front_outline\clear!
202:  front_outline\draw_from front, an.shaders.outline
220:  front_outline\draw!
1844:    -- Draw green cover in front_2 to hide plant roots (weapons draw in front_3)

There's a stale comment. Let me fix it.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. The layer renames are complete:

OK, super emoji invaders has the concept of an Emoji Particle, I think. It's a small particle drawn as an emoji that gets called whenever a relevant effect for that emoji happens. I'd like to port that over here and spawn one of those with a heart whenever refresh is called.

Let me find the emoji particle implementation in super emoji invaders.

Grep (emoji.particle|particle.emoji)

Found 10 files
emoji-ball-battles\reference\emoji_effects_documentation.md
emoji-ball-battles\reference\super emoji pop\main.lua
emoji-ball-battles\reference\emoji-merge-main\main.lua
emoji-ball-battles\reference\emoji-merge-main\README.md
emoji-ball-battles\reference\super-emoji-pairs\src\main.lua
emoji-ball-battles\reference\super-emoji-invaders\src\todo.md
emoji-ball-battles\reference\super-emoji-invaders\src\main.lua
emoji-ball-battles\reference\super-emoji-pop-prototype\src\enemies.lua
emoji-ball-battles\reference\emojunky-one\entities.lua
emoji-ball-battles\reference\emojunky-one\particles.lua

Grep (class.emoji.particle|emoji_particle)

617:    effects:add(emoji_particle('melon', self.x, self.y, {v = random:float(100, 125), r = random:angle(), s = 2.5, duration = random:float(0.5, 0.6), fixed_r = 0, flash_on_spawn = 0.25}))
623:      effects:add(emoji_particle('melon', self.melon_item_ui.x, self.melon_item_ui.y, {v = random:float(100, 125), r = random:angle(), s = 2.5, duration = random:float(0.5, 0.6), fixed_r = 0, flash_on_spawn = 0.25}))
640:        effects:add(emoji_particle('mushroom', self.x, self.y, {v = random:float(100, 125), r = random:angle(), s = 2.5, duration = random:float(0.5, 0.6), fixed_r = 0, flash_on_spawn = 0.25}))
718:        effects:add(emoji_particle('fire', self.x, self.y, {v = random:float(100, 125), r = random:angle(), s = 2.5, duration = random:float(0.5, 0.6), fixed_r = 0, flash_on_spawn = 0.25}))
948:      effects:add(emoji_particle('electric', self.x, self.y, {v = random:float(150, 300), r = math.pi/2 + random:float(-math.pi/4, math.pi/4), flash_on_spawn = 0.5, visual_r = -math.pi/2}))
990:    for i = 1, 3 do effects:add(emoji_particle('electric', self.x, self.y, {v = random:float(25, 150), r = math.angle(nx, ny) + random:float(-math.pi/4, math.pi/4), flash_on_spawn = 0.5, visual_r = -math.pi/2})) end
1211:        effects:add(emoji_particle('chili', self.x, self.y, {v = random:float(100, 125), r = random:angle(), s = 2.5, duration = random:float(0.5, 0.6), fixed_r = 0, flash_on_spawn = 0.25}))
1912:emoji_particle = class:use(transform, timer, hitfx)
1913:function emoji_particle:new(emoji, x, y, args)
1930:function emoji_particle:update(dt)

Read (E:\a327ex\emoji-ball-battles\reference\super-emoji-invaders\src\main.lua)

1910→
  1911→
  1912→emoji_particle = class:use(transform, timer, hitfx)
  1913→function emoji_particle:new(emoji, x, y, args)
  1914→  self.s = args.s or 1
  1915→  self:transform(x, y, args.r or random:angle(), self.s*14/images[emoji].w, self.s*14/images[emoji].h)
  1916→  self:timer()
  1917→  self:hitfx()
  1918→
  1919→  self.emoji = images[emoji]
  1920→  self.v = args.v or random:float(75, 150)
  1921→  self.visual_r = args.visual_r or 0
  1922→  self.fixed_r = args.fixed_r
  1923→  self.duration = args.duration or random:float(0.4, 0.6)
  1924→  self:tween(self.duration, self, {v = 0, sx = 0, sy = 0}, math.linear, function() self.dead = true end)
  1925→  self:hitfx_add('hit', 1)
  1926→  self.flash_on_spawn = args.flash_on_spawn
  1927→  if self.flash_on_spawn then self:flash('hit', self.flash_on_spawn*self.duration) end
  1928→end
  1929→
  1930→function emoji_particle:update(dt)
  1931→  self:move_angled(self.v, self.r)
  1932→  self.emoji:draw('effects', self.x, self.y, self.fixed_r or (self.r + self.visual_r), self.sx, self.sy, nil, nil, colors.white[0], self.flashes.hit.x and shaders.combine)
  1933→end
  1934→
  1935→
  1936→boom_particle = class:use(transform, timer)
  1937→function boom_particle:new(x, y)
  1938→  self:transform(x, y, random:angle(), 24/images.boom.w, 24/images.boom.h)
  1939→  self:timer()
... [20 more lines]

I see how it works. Let me create an emoji_particle class in the style of your existing particles and add it to hp_ui's refresh method.

Read (E:\a327ex\emoji-ball-battles\main.yue)

1370→
  1371→
  1372→
  1373→-- Star particle: spawns on collisions, shoots outward, spins, shrinks
  1374→class star_particle extends object
  1375→  new: (@x, @y, args={}) =>
  1376→    super!
  1377→    multiplier = args.multiplier or 1
  1378→    @velocity = multiplier*(args.velocity or an.random\float 75, 150)
  1379→    @direction = args.direction or an.random\angle!
  1380→    @rotation = an.random\angle!
  1381→    @rotation_speed = multiplier*(an.random\float -2*math.pi, 2*math.pi)
  1382→    @duration = multiplier*(args.duration or an.random\float 0.4, 0.6)
  1383→    @sx, @sy = multiplier*14/512, multiplier*14/512  -- star.png is 512x512, scale to ~14 pixels
  1384→
  1385→    @\add timer!
  1386→    @timer\tween @duration, @, {velocity: 0, sx: 0, sy: 0}, math.linear, -> @\kill!
  1387→
  1388→  update: (dt) =>
  1389→    @x += @velocity*math.cos(@direction)*dt
  1390→    @y += @velocity*math.sin(@direction)*dt
  1391→    @rotation += @rotation_speed*dt
  1392→
  1393→    effects\push @x, @y, @rotation, @sx, @sy
  1394→    effects\image an.images.star, 0, 0
  1395→    effects\pop!
  1396→
  1397→
  1398→
  1399→-- Hit circle: expanding/shrinking circle at impact point
... [20 more lines]

Read (E:\a327ex\emoji-ball-battles\main.yue)

1350→    text_w = an.fonts.lana\text_width text_string
  1351→    text_h = an.fonts.lana.height
  1352→    effects\push @x, @y + @text_oy, 0, @spring.text.x, @spring.text.x
  1353→    effects\text text_string, 'lana', -text_w/2 + 0.5, -text_h/2, white!
  1354→    effects\pop!
  1355→
  1356→  refresh: (new_hp) =>
  1357→    @hp = new_hp
  1358→    @flashing = true
  1359→    @timer\after 0.1, 'flash', -> @flashing = false
  1360→
  1361→    -- Heart bounce and flash
  1362→    @heart_oy = -3
  1363→    @timer\tween 0.5, @, {heart_oy: 0}, math.cubic_out, nil, 'heart_oy'
  1364→    @spring\pull 'heart', 0.3, 3, 0.7
  1365→    -- Text bounce (slightly delayed)
  1366→    @timer\after 0.04, ->
  1367→      @text_oy = -3
  1368→      @timer\tween 0.5, @, {text_oy: 0}, math.cubic_out, nil, 'text_oy'
  1369→      @spring\pull 'text', 0.5, 3, 0.5
  1370→
  1371→
  1372→
  1373→-- Star particle: spawns on collisions, shoots outward, spins, shrinks
  1374→class star_particle extends object
  1375→  new: (@x, @y, args={}) =>
  1376→    super!
  1377→    multiplier = args.multiplier or 1
  1378→    @velocity = multiplier*(args.velocity or an.random\float 75, 150)
  1379→    @direction = args.direction or an.random\angle!

I'll add the emoji_particle class after star_particle, then update hp_ui refresh to spawn heart particles.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Now let me update the hp_ui refresh method to spawn heart particles.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Let me verify it builds correctly.

Bash (cd E:/a327ex/emoji-ball-battles && ./build.bat 2>&1)

Exit code 127
/usr/bin/bash: line 1: ./build.bat: No such file or directory

Bash (cd E:/a327ex/emoji-ball-battles && yue -e main.yue 2>&1 | head -30)

The user doesn't want to proceed with this tool use. The tool use was rejected (eg. if it was a file edit, the new_string was NOT written to the file). STOP what you are doing and wait for the user to tell you how to proceed.

Let's add the following two things to it. A gravity option, like the hit_particle. And then an option for the angle to follow the emoji's velocity vector, or its opposite.

Read (E:\a327ex\emoji-ball-battles\main.yue)

1455→      @flashing = true
  1456→      @timer\after 0.1, -> @flashing = false
  1457→
  1458→  update: (dt) =>
  1459→    effects\circle @x, @y, @radius, if @flashing then white! else @color!
  1460→
  1461→
  1462→-- Boom particle: muzzle flash effect that scales down quickly
  1463→class boom_particle extends object
  1464→  new: (@x, @y, args={}) =>
  1465→    super!
  1466→    @image = an.images.boom
  1467→    @rotation = an.random\angle!
  1468→    @scale = (args.size or 24) / @image.width
  1469→
  1470→    @\add timer!
  1471→    duration = an.random\float 0.1, 0.15
  1472→    @timer\tween duration, @, {scale: 0}, math.cubic_in_out, -> @\kill!
  1473→
  1474→  update: (dt) =>
  1475→    effects\push @x, @y, @rotation, @scale, @scale
  1476→    effects\image @image, 0, 0
  1477→    effects\pop!
  1478→
  1479→
  1480→
  1481→-- Hit particle: rectangle that shoots outward and shrinks
  1482→class hit_particle extends object
  1483→  new: (@x, @y, args={}) =>
  1484→    super!
... [5 more lines]

Read (E:\a327ex\emoji-ball-battles\main.yue)

1495→    @\add timer!
  1496→    @timer\tween @duration, @, {velocity: 0, sx: 0, sy: 0}, math.linear, -> @\kill!
  1497→
  1498→    if args.flash_on_spawn
  1499→      @flashing = true
  1500→      @timer\after 0.1, -> @flashing = false
  1501→
  1502→  update: (dt) =>
  1503→    @gravity_velocity += @gravity_acceleration*dt
  1504→
  1505→    -- Compute actual velocity components
  1506→    vx = @velocity*math.cos(@direction)
  1507→    vy = @velocity*math.sin(@direction) + @gravity_velocity
  1508→
  1509→    -- Move based on actual velocity
  1510→    @x += vx*dt
  1511→    @y += vy*dt
  1512→
  1513→    effects\push @x, @y, math.angle(vx, vy), @sx, @sy
  1514→    effects\rounded_rectangle -@w/2, -@h/2, @w, @h, math.min(@w, @h)/2, if @flashing then white! else @color!
  1515→    effects\pop!
  1516→
  1517→
  1518→
  1519→-- Dash particle: spawns when ball unsticks from floor

Now I understand. Let me update the emoji_particle class.

Read (E:\a327ex\emoji-ball-battles\main.yue)

1399→    @x += @velocity*math.cos(@direction)*dt
  1400→    @y += @velocity*math.sin(@direction)*dt
  1401→    @rotation += @rotation_speed*dt
  1402→
  1403→    effects\push @x, @y, @rotation, @sx, @sy
  1404→    effects\image an.images.star, 0, 0
  1405→    effects\pop!
  1406→
  1407→
  1408→
  1409→-- Emoji particle: generic emoji that shoots outward and shrinks
  1410→class emoji_particle extends object
  1411→  new: (@x, @y, @image, args={}) =>
  1412→    super!
  1413→    @scale = args.scale or 1
  1414→    @velocity = args.velocity or an.random\float(75, 150)
  1415→    @direction = args.direction or an.random\angle!
  1416→    @rotation = args.fixed_rotation or an.random\angle!
  1417→    @rotation_speed = if args.fixed_rotation then 0 else an.random\float(-2*math.pi, 2*math.pi)
  1418→    @duration = args.duration or an.random\float(0.4, 0.6)
  1419→    @scale = 14*@scale/@image.width
  1420→
  1421→    @\add timer!
  1422→    @\add spring!
  1423→    @timer\tween @duration, @, {velocity: 0, scale: 0}, math.linear, -> @\kill!
  1424→
  1425→    if args.flash_on_spawn
  1426→      @flashing = true
  1427→      flash_duration = (args.flash_on_spawn or 1)*@duration
  1428→      @timer\after flash_duration, -> @flashing = false
... [5 more lines]

Read (E:\a327ex\emoji-ball-battles\main.yue)

1430→
  1431→  update: (dt) =>
  1432→    @x += @velocity*math.cos(@direction)*dt
  1433→    @y += @velocity*math.sin(@direction)*dt
  1434→    @rotation += @rotation_speed*dt
  1435→
  1436→    effects\push @x, @y, @rotation, @scale*@spring.main.x, @scale*@spring.main.x
  1437→    effects\image @image, 0, 0, nil, @flashing and white!
  1438→    effects\pop!
  1439→
  1440→
  1441→
  1442→-- Hit circle: expanding/shrinking circle at impact point
  1443→class hit_circle extends object
  1444→  new: (@x, @y, args={}) =>

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. The emoji_particle now has:

Add an option for angle mode that also does the fixed_rotation option, and remove it.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Now let me update the hp_ui refresh to use the new angle_mode instead of fixed_rotation.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

<tool_use_error>String to replace not found in file.
String:     -- Spawn heart emoji particles
    arena = @parent.parent
    for i = 1, an.random\int(1, 2)
      arena.effects\add emoji_particle @x, @y, an.images.heart,
        velocity: an.random\float(100, 125)
        direction: an.random\angle!
        scale: 2.5
        duration: an.random\float(0.5, 0.6)
        fixed_rotation: 0
        flash_on_spawn: 0.25</tool_use_error>

Grep (fixed_rotation)

No matches found

Grep (emoji_particle)

1371-    -- Spawn heart emoji particles
1372-    arena = @parent.parent
1373-    for i = 1, an.random\int 1, 2
1374:      arena.effects\add emoji_particle @x, @y, an.images.heart,
1375-        velocity: an.random\float(100, 125)
1376-        direction: an.random\angle!
1377-        scale: 1
--
1408-
1409--- Emoji particle: generic emoji that shoots outward and shrinks
1410--- angle_mode: nil = spin randomly, 'forward' = face velocity, 'backward' = face opposite, number = fixed angle
1411:class emoji_particle extends object
1412-  new: (@x, @y, @image, args={}) =>
1413-    super!
1414-    @scale = args.scale or 1

Read (E:\a327ex\emoji-ball-battles\main.yue)

1368→      @timer\tween 0.5, @, {text_oy: 0}, math.cubic_out, nil, 'text_oy'
  1369→      @spring\pull 'text', 0.5, 3, 0.5
  1370→
  1371→    -- Spawn heart emoji particles
  1372→    arena = @parent.parent
  1373→    for i = 1, an.random\int 1, 2
  1374→      arena.effects\add emoji_particle @x, @y, an.images.heart,
  1375→        velocity: an.random\float(100, 125)
  1376→        direction: an.random\angle!
  1377→        scale: 1
  1378→        duration: an.random\float(0.5, 0.6)
  1379→        flash_on_spawn: 0.25
  1380→
  1381→
  1382→

The code is already updated - the user removed fixed_rotation from the hp_ui call. The emoji_particle class now has:

Make the initial velocity angle for the little hearts only on the bottom 2 quadrants, never up. Also make them spawn slightly off from the center, maybe by some radius outside the center.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

<tool_use_error>File has been modified since read, either by the user or by a linter. Read it again before attempting to write it.</tool_use_error>

Read (E:\a327ex\emoji-ball-battles\main.yue)

1368→      @timer\tween 0.5, @, {text_oy: 0}, math.cubic_out, nil, 'text_oy'
  1369→      @spring\pull 'text', 0.5, 3, 0.5
  1370→
  1371→    -- Spawn heart emoji particles
  1372→    arena = @parent.parent
  1373→    for i = 1, an.random\int 1, 2
  1374→      arena.effects\add emoji_particle @x, @y, an.images.heart,
  1375→        velocity: an.random\float(100, 125)
  1376→        direction: an.random\angle!
  1377→        scale: 1
  1378→        duration: an.random\float(0.5, 0.6)
  1379→        flash_on_spawn: 0.25
  1380→        angle_mode: 0
  1381→        gravity: -128
  1382→
  1383→
  1384→
  1385→-- Star particle: spawns on collisions, shoots outward, spins, shrinks
  1386→class star_particle extends object
  1387→  new: (@x, @y, args={}) =>

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. Heart particles now:

Add a spring tied to the rotation of the heart and pull on it slightly on refresh.

Read (E:\a327ex\emoji-ball-battles\main.yue)

1310→    @x = if team == 'player' then 0.2*gw else 0.8*gw
  1311→    @y = 28
  1312→    @hp = hp
  1313→    @max_hp = max_hp
  1314→    @heart_scale = 24/512
  1315→    @heart_size = 24
  1316→    @heart_oy = 0
  1317→    @text_oy = 0
  1318→    @flashing = false
  1319→    @\add spring!
  1320→    @spring\add 'heart', 1
  1321→    @spring\add 'text', 1
  1322→    @\add timer!
  1323→
  1324→  update: (dt) =>
  1325→    -- Calculate fill based on HP
  1326→    fill_ratio = @hp / @max_hp
  1327→    fill_h = @heart_size * fill_ratio
  1328→    heart_bottom = @y + @heart_oy + @heart_size/2
  1329→    mask_top = heart_bottom - fill_h
  1330→
  1331→    -- Draw full heart to heart_temp for outline shader (processed in main draw)
  1332→    outline_only\push @x, @y + @heart_oy, 0, @heart_scale * @spring.heart.x, @heart_scale * @spring.heart.x
  1333→    outline_only\image an.images.heart, 0, 0
  1334→    outline_only\pop!
  1335→
  1336→    -- Draw mask rectangle (bottom portion of heart area)
  1337→    cover\stencil_mask!
  1338→    cover\rectangle @x - @heart_size/2, mask_top, @heart_size, fill_h, white!
  1339→
... [20 more lines]

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Read (E:\a327ex\emoji-ball-battles\main.yue)

1356→
  1357→  refresh: (new_hp) =>
  1358→    @hp = new_hp
  1359→    @flashing = true
  1360→    @timer\after 0.1, 'flash', -> @flashing = false
  1361→
  1362→    -- Heart bounce and flash
  1363→    @heart_oy = -3
  1364→    @timer\tween 0.5, @, {heart_oy: 0}, math.cubic_out, nil, 'heart_oy'
  1365→    @spring\pull 'heart', 0.3, 3, 0.7
  1366→    -- Text bounce (slightly delayed)
  1367→    @timer\after 0.04, ->
  1368→      @text_oy = -3
  1369→      @timer\tween 0.5, @, {text_oy: 0}, math.cubic_out, nil, 'text_oy'
  1370→      @spring\pull 'text', 0.5, 3, 0.5
  1371→
  1372→    -- Spawn heart emoji particles
  1373→    arena = @parent.parent
  1374→    for i = 1, an.random\int 1, 2
  1375→      -- Direction only in bottom 2 quadrants (0 to pi = downward)

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. Added a rotation spring that wobbles the heart slightly (random pull between -0.3 and 0.3 radians) on refresh.

Also apply it to the text.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. The text now also rotates with the same spring as the heart.

Let's change slight_smile to cowboy and let me see what it looks like.

Bash (ls E:/a327ex/emoji-ball-battles/assets/ | grep -i cowboy)

cowboy.png
cowboy_hit.png

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Grep (slight_smile)

68:an\image 'slight_smile', 'assets/slight_smile.png'
993:    @image = @team == 'player' and an.images.slight_smile or an.images.no_mouth

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. Changed the player ball from slight_smile to cowboy.

Increased the visual size of the ball (visual only) when its the cowboy by 25%.

Read (E:\a327ex\emoji-ball-battles\main.yue)

990→  new: (@x, @y, @team, @weapon_type='dagger') =>
   991→    super!
   992→    @\tag 'ball'
   993→    @image = @team == 'player' and an.images.cowboy or an.images.no_mouth
   994→    @radius = 10
   995→    @scale = 2*@radius/@image.width
   996→
   997→    -- Weapon setup based on weapon_type
   998→    if @weapon_type == 'gun'
   999→      @weapon_class = 'ranged'
  1000→      @weapon_image = an.images.gun
  1001→      @weapon_visual_offset = 21
  1002→      @weapon_hitbox_offset = 21
  1003→      @weapon_hitbox_length = 20
  1004→      @weapon_hitbox_width = 12
  1005→      @weapon_scale = 18/512  -- gun.png is 512x512
  1006→      @weapon_scale_y = -18/512  -- y flipped
  1007→      @weapon_rotation_offset = math.pi  -- gun points left, rotate to point outward
  1008→    else  -- dagger
  1009→      @weapon_class = 'melee'

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. The cowboy ball is now visually 25% larger while keeping the same physics radius.

OK, now add this as a child of ball, like the HP UI. It's a visual representation of each emoji, under the hp_ui heart. It should idle by lightly waving around like the handcam (with different values). It's possible we can even use the actual shake module + handcam effect on the object itself to make it wobble in that specific way. For the left, it should be the cowboy, for the right, the no mouth emoji. Then, whenever the ball gets hit, that emoji changes to the cowboy_hit, no_mouth_hit versions temporarily while the hit is happening, then back. Additional juice effects, similar to the hp_ui, also apply on hit.

Bash (ls E:/a327ex/emoji-ball-battles/assets/ | grep -i "no_mouth|hit")

cowboy_hit.png
hit1.png
no_mouth.png
no_mouth_hit.png
player_hit.ogg

Read (E:\a327ex\emoji-ball-battles\main.yue)

33→-- Camera (must be created before layers, which default to an.camera)
    34→an\add camera gw, gh
    35→an.camera\add shake!
    36→an.camera.shake\handcam true, {x: 2, y: 2, rotation: 0.02}, 0.5
    37→
    38→-- Layers
    39→bg = an\layer 'bg'
    40→back = an\layer 'back'
    41→back_outline = an\layer 'back_outline'
    42→game = an\layer 'game'

Read (E:\a327ex\emoji-ball-battles\main.yue)

1065→    @weapon_recoil_offset = 0  -- position offset for gun recoil (moves toward ball)
  1066→
  1067→    -- HP
  1068→    @max_hp = 100
  1069→    @hp = @max_hp
  1070→    @\add hp_bar!
  1071→
  1072→    -- HP UI (heart + number display at top of screen)
  1073→    @\add hp_ui @team, @hp, @max_hp
  1074→
  1075→    -- Start ball movement after 3 seconds
  1076→    @\add timer!
  1077→    @collider\set_gravity_scale 0
  1078→    @timer\after 3, ->
  1079→      @collider\set_gravity_scale 1
  1080→      @collider\apply_impulse an.random\sign!*an.random\float(5, 10), an.random\float(-10, 10)
  1081→      @collider\set_angular_velocity @base_angular_velocity
  1082→
  1083→    -- Gun auto-firing: when aligned and ready, fire
  1084→    if @weapon_type == 'gun'
  1085→      @gun_ready = true
  1086→      @timer\when (-> @gun_ready and @\gun_is_aligned!), 'gun_fire', (-> @\gun_fire!)
  1087→
  1088→  update: (dt) =>
  1089→    -- Read angle from physics
  1090→    @angle = @collider\get_angle!
  1091→
  1092→    -- Angular velocity guardrails
  1093→    angular_velocity = @collider\get_angular_velocity!
  1094→    angular_speed = math.abs(angular_velocity)

Read (E:\a327ex\emoji-ball-battles\main.yue)

1172→    weapons\image @weapon_image, 0, 0, nil, @weapon_flashing and white!
  1173→    weapons\pop!
  1174→
  1175→  take_damage: (amount, source) =>
  1176→    return unless @parent  -- Guard against events before fully added
  1177→    @hp -= amount
  1178→    @spring\pull 'hit', 0.3, 3, 0.7
  1179→    @\flash_ball!
  1180→
  1181→    -- Sound
  1182→    an\sound_play 'dagger_ball', 0.88, an.random\float(0.95, 1.05)
  1183→    -- if @team == 'player'
  1184→    --   an\sound_play 'player_hit', 0.5, an.random\float(0.95, 1.05)
  1185→
  1186→    -- Spawn damage number above
  1187→    @parent\add damage_number @x, @y - @radius - 10, amount, {duration_multiplier: 0.5}
  1188→
  1189→    -- Show HP bar
  1190→    @hp_bar\activate!
  1191→
  1192→    -- Update HP UI
  1193→    @hp_ui\refresh @hp
  1194→
  1195→    -- Camera shake when player takes damage
  1196→    if @team == 'player'
  1197→      an.camera.shake\shake 4, 0.15
  1198→
  1199→    if @hp <= 0
  1200→      an\sound_play 'player_death', 0.44, an.random\float(0.95, 1.05)
  1201→      @\kill!

First, let me add the hit emoji images to the assets.

Read (E:\a327ex\emoji-ball-battles\main.yue)

67→-- Images
    68→an\image 'slight_smile', 'assets/slight_smile.png'
    69→an\image 'cowboy', 'assets/cowboy.png'
    70→an\image 'no_mouth', 'assets/no_mouth.png'
    71→an\image 'dagger', 'assets/dagger.png'
    72→an\image 'gun', 'assets/gun.png'
    73→an\image 'gun', 'assets/gun.png'
    74→an\image 'boom', 'assets/boom.png'
    75→an\image 'star', 'assets/star.png'
    76→an\image 'dash', 'assets/dash.png'

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Read (E:\a327ex\emoji-ball-battles\main.yue)

1385→      spawn_y = @y + spawn_radius*math.sin(direction)
  1386→      arena.effects\add emoji_particle spawn_x, spawn_y, an.images.heart,
  1387→        velocity: an.random\float(80, 120)
  1388→        direction: direction
  1389→        scale: an.random\float(0.95, 1.05)
  1390→        duration: an.random\float(0.5, 0.8)
  1391→        flash_on_spawn: 0.25
  1392→        angle_mode: 0
  1393→        gravity: -128
  1394→
  1395→
  1396→
  1397→-- Star particle: spawns on collisions, shoots outward, spins, shrinks
  1398→class star_particle extends object
  1399→  new: (@x, @y, args={}) =>
  1400→    super!
  1401→    multiplier = args.multiplier or 1
  1402→    @velocity = multiplier*(args.velocity or an.random\float 75, 150)
  1403→    @direction = args.direction or an.random\angle!
  1404→    @rotation = an.random\angle!

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Now let me add it as a child of ball and call it on hit.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. Added emoji_display class that:

ERROR: main.lua:1428: attempt to call a nil value (method 'get') stack traceback: main.lua:1428: in method 'update' anchor/object.lua:401: in method '_update' anchor/init.lua:1504: in function 'update'

It's get_transform, read the shake.yue file.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

<tool_use_error>File has been modified since read, either by the user or by a linter. Read it again before attempting to write it.</tool_use_error>

Grep (shake\get)

1428:    ox, oy, r = @shake\get!

Read (E:\a327ex\emoji-ball-battles\main.yue)

1425→
  1426→  update: (dt) =>
  1427→    -- Get shake offsets
  1428→    ox, oy, r = @shake\get!
  1429→    current_image = if @showing_hit then @hit_image else @image
  1430→
  1431→    effects\push @x + ox, @y + @oy + oy, r + @spring.rotation.x, @scale*@spring.scale.x, @scale*@spring.scale.x
  1432→    effects\image current_image, 0, 0, nil, @flashing and white!
  1433→    effects\pop!
  1434→

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Fixed.

Did you read the file?

No, I just used your hint. Let me read it properly.

Read (E:\a327ex\emoji-ball-battles\anchor\shake.yue)

1→global *
     2→
     3→--[[
     4→  Shake child object for camera shake effects.
     5→
     6→  Usage:
     7→    an.camera\add shake!
     8→    an.camera.shake\trauma 0.5, 0.3
     9→
    10→  Shake is added as a child of camera. It implements get_transform() which
    11→  camera calls to collect effects from all children.
    12→
    13→  Shake types:
    14→    trauma - Perlin noise based, accumulates and decays
    15→]]
    16→class shake extends object
    17→  --[[
    18→    Creates a new shake container.
    19→
    20→    Usage:
    21→      an.camera\add shake!
    22→
    23→    Behavior:
    24→      - Automatically named 'shake' and accessible as parent.shake
    25→      - Initializes trauma system
    26→  ]]
    27→  new: =>
    28→    super 'shake'
    29→    @trauma_instances = {}
    30→    @trauma_amplitude = {x: 24, y: 24, rotation: 0.2, zoom: 0.2}
... [310 more lines]

I see - get_transform returns a table {x, y, rotation, zoom}, not multiple values. Let me fix that.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Fixed. Now it properly unpacks the transform table.

Add 1 or 2 star particles spawning from the emoji display on hit, but add them as emoji particles rotating quickly and flashing on spawn, not as star_particles.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

<tool_use_error>File has been modified since read, either by the user or by a linter. Read it again before attempting to write it.</tool_use_error>

Grep (on_hit:)

No matches found

Grep (emoji_display)

1078:    @\add emoji_display @team
1201:    @emoji_display\hit!
1404:class emoji_display extends object
1406:    super 'emoji_display'

Read (E:\a327ex\emoji-ball-battles\main.yue)

1404→class emoji_display extends object
  1405→  new: (team) =>
  1406→    super 'emoji_display'
  1407→    @x = if team == 'player' then 0.2*gw else 0.8*gw
  1408→    @y = 56  -- below hp_ui heart
  1409→    @team = team
  1410→    @image = if team == 'player' then an.images.cowboy else an.images.no_mouth
  1411→    @hit_image = if team == 'player' then an.images.cowboy_hit else an.images.no_mouth_hit
  1412→    @scale = 20/512
  1413→    @scale *= 1.1 if team == 'player'
  1414→    @showing_hit = false
  1415→    @oy = 0
  1416→    @flashing = false
  1417→
  1418→    @\add spring!
  1419→    @spring\add 'scale', 1
  1420→    @spring\add 'rotation', 0
  1421→    @\add timer!
  1422→
  1423→    -- Handcam-like wobble using shake module
  1424→    @\add shake!
  1425→    @shake\handcam true, {x: an.random\float(0, 3), y: an.random\float(0, 3), rotation: an.random\float(0.2, 0.3)}, an.random\float(0.4, 0.8)
  1426→
  1427→  update: (dt) =>
  1428→    -- Get shake offsets
  1429→    t = @shake\get_transform!
  1430→    current_image = if @showing_hit then @hit_image else @image
  1431→
  1432→    weapons\push @x + t.x, @y + @oy + t.y, t.rotation + @spring.rotation.x, @scale*@spring.scale.x, @scale*@spring.scale.x
  1433→    weapons\image current_image, 0, 0
... [20 more lines]

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. Added 1-2 star emoji particles that spawn on hit, spinning and flashing.

Change spawn to never spawn "up", only to maximum of -math.pi/4 and the mirror opposite on the other quadrant.

Edit (E:\a327ex\emoji-ball-battles\main.yue)

<tool_use_error>File has been modified since read, either by the user or by a linter. Read it again before attempting to write it.</tool_use_error>

Grep (Spawn star emoji)

1439-    @timer\after 0.25, 'hit_image', -> @showing_hit = false
1440-
1441-    -- Bounce and rotation
1442-    @oy = -3
1443-    @timer\tween 0.5, @, {oy: 0}, math.cubic_out, nil, 'oy'
1444-    @spring\pull 'scale', 0.3, 3, 0.7
1445-    @spring\pull 'rotation', an.random\float(-0.3, 0.3), 3, 0.5
1446-
1447:    -- Spawn star emoji particles (rotating quickly, flashing)
1448-    arena = @parent.parent
1449-    for i = 1, an.random\int 1, 2
1450-      arena.effects\add emoji_particle @x, @y, an.images.star,
1451-        velocity: an.random\float(75, 125)
1452-        direction: an.random\angle!
1453-        scale: 1
1454-        duration: an.random\float(0.4, 0.6)
1455-        flash_on_spawn: 0.25

Edit (E:\a327ex\emoji-ball-battles\main.yue)

<tool_use_error>File has been modified since read, either by the user or by a linter. Read it again before attempting to write it.</tool_use_error>

Read (E:\a327ex\emoji-ball-battles\main.yue)

1447→    -- Spawn star emoji particles (rotating quickly, flashing)
  1448→    arena = @parent.parent
  1449→    for i = 1, an.random\int 1, 2
  1450→      arena.effects\add emoji_particle @x, @y, an.images.star,
  1451→        velocity: an.random\float(75, 125)
  1452→        direction: an.random\angle!
  1453→        scale: 1
  1454→        duration: an.random\float(0.4, 0.6)
  1455→        flash_on_spawn: 0.25
  1456→        gravity: 128
  1457→
  1458→

Edit (E:\a327ex\emoji-ball-battles\main.yue)

The file E:\a327ex\emoji-ball-battles\main.yue has been updated successfully.

Done. Direction now limited to -π/4 to 5π/4 (avoids the top 90° arc).

Perfect, that's it for now. What was the rest that we decided we'd do in this session?

From the original session plan, the remaining tasks were:

  1. Weapon effect descriptions - Text explaining each weapon's passive effect (displayed somewhere in the UI)

  2. Dagger mechanic - Every hit increases base spin velocity ("attack speed")

  3. Revolver mechanic - Every hit decreases cooldown and spread

We completed the HP UI with the heart fill/outline, emoji particles, and the emoji display with hit effects. The weapon mechanics and their descriptions are still pending.

OK, change the implementation plan with what we did, and then add the remaining things as next steps, we'll tackle those in another session.

Bash (ls E:/a327ex/emoji-ball-battles/reference/ 2>/dev/null | head -20)

basic-emoji-anchor-game.md
earclacks-attribute-analysis.md
effects_api_gaps.md
emoji_effects_documentation.md
emoji-merge-main/
emojunky-one/
sound_mapping.md
super emoji box/
super emoji pop/
super-emoji-box/
super-emoji-invaders/
super-emoji-pairs/
super-emoji-pop-prototype/

Write (E:\a327ex\emoji-ball-battles\reference\hp_ui_and_weapon_effects_plan.md)

File created successfully at: E:\a327ex\emoji-ball-battles\reference\hp_ui_and_weapon_effects_plan.md

Created reference/hp_ui_and_weapon_effects_plan.md with the completed work and next steps for the weapon mechanics.

No dude, @emoji-ball-battles\docs\IMPLEMENTATION_PLAN.md

Read (E:\a327ex\emoji-ball-battles\docs\IMPLEMENTATION_PLAN.md)

500→- Side walls extend downward to cover corners
   501→- All walls use `wall_color` (slightly yellowed off-white)
   502→
   503→**Bug fix**: Fixed YueScript `_anon_func_0` collision in color.yue where inline conditionals in both color.yue and main.yue compiled to the same global function name, causing crashes.
   504→
   505→**Explored but deferred**: Wall dithering/gradient transitions between colors. Checkpointed at commit ed892d7. Will revisit when implementing physics-based UI with joints and chains (like emoji-merge reference).
   506→
   507→### 1.19 Gun Weapon + Projectiles ✓
   508→
   509→**Goal**: Ranged weapon that fires projectiles.
   510→
   511→**Implemented**:
   512→
   513→**Projectile class**:
   514→- Box collider (15x8), gravity scale 0.5, restitution 0.75
   515→- Sensor shape for ball detection (passes through balls)
   516→- Bounces twice on walls, dies on third hit
   517→- Can be parried by weapons (treated like wall hit)
   518→- `owner_id` prevents hitting the ball that spawned it
   519→- Spring feedback and flash on spawn
   520→- Yellow hit particles with gravity on wall/weapon impact
   521→
   522→**Gun weapon**:
   523→- `weapon_type = 'gun'` with gun-specific visuals (image, offsets, y-flip)
   524→- `weapon_category = 'ranged'` - no contact damage, can't kill plants (only sway)
   525→- Auto-fires when raycast from gun tip detects enemy ball
   526→- 0.6s cooldown between shots using `timer\when` with manual `@gun_ready` flag
   527→- Recoil animation: rotation (-45°) + position offset (4px toward ball), tweens back
   528→- `boom_particle` muzzle flash effect (boom emoji scales down quickly)
   529→- Gun positioned 2 pixels "up" (perpendicular to angle) for visual alignment
... [20 more lines]

Read (E:\a327ex\emoji-ball-battles\docs\IMPLEMENTATION_PLAN.md)

620→- Subsequent sounds play every full rotation
   621→- Maximum 5 sounds per spin sequence
   622→- Tracks `@fast_spinning`, `@rotation_accumulator`, `@swing_sound_count` state
   623→
   624→**Ball-wall pitch modulation**:
   625→```yuescript
   626→intensity = math.clamp(math.remap(math.length(vx, vy), 0, 800, 0, 1), 0, 1)
   627→pitch = if intensity > 0.45 then 1.0 + math.remap(intensity, 0.45, 1, 0, 0.3) else 1.0
   628→an\sound_play 'ball_wall', 0.4, pitch * an.random\float(0.95, 1.05)
   629→```
   630→
   631→**Assets location**: `assets/sounds/` — all OGG format.
   632→
   633→---
   634→
   635→## Phase 2: End (Broken Builds)
   636→
   637→### 2.1 Purpose
   638→
   639→Implement actual ball classes, weapons, and items (logic only, no visual emojis yet). Test end-game builds by manually activating combinations in code. Validate that broken builds are satisfying to watch.
   640→
   641→### 2.2 Ball Classes to Implement
   642→
   643→Implement a subset of classes that represent the five power fantasy archetypes. Each class has one core mechanic.
   644→
   645→**Blender archetype** (constant whirling damage):
   646→- **😵‍💫 Cyclone**: Rotation speed increases over time during fight
   647→
   648→**Berserker archetype** (low HP = power):
   649→- **😡 Rage**: Damage increases based on missing HP percentage

Edit (E:\a327ex\emoji-ball-battles\docs\IMPLEMENTATION_PLAN.md)

The file E:\a327ex\emoji-ball-battles\docs\IMPLEMENTATION_PLAN.md has been updated successfully.

Updated the implementation plan with sections 1.23 (HP UI System), 1.24 (Emoji Display), and 1.25 (Weapon Effect Mechanics - marked as not yet implemented). Let me also delete the redundant reference file.

Bash (rm E:/a327ex/emoji-ball-battles/reference/hp_ui_and_weapon_effects_plan.md)

Done. Updated docs/IMPLEMENTATION_PLAN.md with:

Great, thank you.

You're welcome. Good session - the HP UI with the draining heart and emoji display add nice visual feedback. The weapon mechanics are ready to tackle next time.