Introduce Rect class and UIElement base class for layout

Refactor skill button and row to use UIElement with Rect bounds and
transform Update layout references and coordinate calculations
accordingly

lib/simple_ui/element.lua

@@ -0,0 +1,21 @@
+local Rect = require "lib.simple_ui.rect"
+
+--- @class UIElement
+--- @field bounds Rect Прямоугольник, в границах которого размещается элемент. Размеры и положение в *локальных* координатах
+--- @field transform love.Transform Преобразование из локальных координат элемента (bounds) в экранные координаты
+local uiElement = {
+    bounds = Rect {},
+    transform = love.math.newTransform()
+}
+uiElement.__index = uiElement
+
+function uiElement:update(dt) end
+
+function uiElement:draw() end
+
+function uiElement:hitTest(screenX, screenY)
+    local lx, ly = self.transform:inverseTransformPoint(screenX, screenY)
+    return self.bounds:hasPoint(lx, ly)
+end
+
+return uiElement

lib/simple_ui/level/layout.lua

@@ -1,32 +1,8 @@
 local icons = require("lib.utils.sprite_atlas").load(Tree.assets.files.dev_icons)
 local easing = require "lib.utils.easing"
 local AnimationNode = require "lib.animation_node"
-
---- @class UIElement
-local uiElement = {
-    x = 0,
-    y = 0,
-    width = 0,
-    height = 0,
-    transform = love.math.newTransform()
-}
-uiElement.__index = uiElement
-
-function uiElement:update(dt) end
-
-function uiElement:draw() end
-
-function uiElement:show(animationNode) end
-
-function uiElement:hide(animationNode) end
-
-function uiElement:hitTest(screenX, screenY)
-    local lx, ly = self.transform:inverseTransformPoint(screenX, screenY)
-    local belongs = function(value, lower, upper)
-        return value >= lower and value < upper
-    end
-    return belongs(lx, self.x, self.x + self.width) and belongs(ly, self.y, self.y + self.height)
-end
+local Element = require "lib.simple_ui.element"
+local Rect = require "lib.simple_ui.rect"
 
 --- @class SkillButton : UIElement
 --- @field showNode AnimationNode?
@@ -35,7 +11,7 @@ end
 --- @field selected boolean
 --- @field onClick function?
 --- @field icon string
-local skillButton = setmetatable({}, uiElement)
+local skillButton = setmetatable({}, Element)
 skillButton.__index = skillButton
 
 function skillButton.new(icon)
@@ -99,7 +75,7 @@ end
 --- @field characterId Id
 --- @field selected SkillButton?
 --- @field children SkillButton[]
-local skillRow = setmetatable({}, uiElement)
+local skillRow = setmetatable({}, Element)
 skillRow.__index = skillRow
 
 --- @param characterId Id
@@ -151,15 +127,17 @@ function skillRow:update(dt)
     local screenW, screenH = love.graphics.getDimensions()
     local padding = 8
     local count = #self.children
-    self.width, self.height, self.x, self.y = count * icons.tileSize + (count - 1) * padding, iconSize, 0,
-        0 -- в локальных координатах
 
+    self.bounds = Rect {
+        width = count * icons.tileSize + (count - 1) * padding,
+        height = iconSize
+    }
     self.transform = love.math.newTransform():translate(screenW / 2,
-        screenH - 16):scale(scale, scale):translate(-self.width / 2, -iconSize)
+        screenH - 16):scale(scale, scale):translate(-self.bounds.width / 2, -iconSize)
 
     for i, skb in ipairs(self.children) do
-        skb.width, skb.height = iconSize, iconSize
-        skb.transform = self.transform:clone():translate(self.x + (i - 1) * iconSize +
+        skb.bounds = Rect { height = iconSize, width = iconSize }
+        skb.transform = self.transform:clone():translate(self.bounds.x + (i - 1) * iconSize +
             (i - 1) *
             padding, -- левый край ряда + размер предыдущих иконок + размер предыдущих отступов
             0        -- высота не меняется

lib/simple_ui/rect.lua

@@ -0,0 +1,24 @@
+--- @class Rect
+--- @field x number
+--- @field y number
+--- @field width number
+--- @field height number
+local rect = {}
+rect.__index = rect
+
+--- @param table {x: number, y: number, width: number, height: number}
+function rect.new(table)
+    local r = {
+        x = table.x or 0,
+        y = table.y or 0,
+        width = table.width or 0,
+        height = table.height or 0
+    }
+    return setmetatable(r, rect)
+end
+
+function rect:hasPoint(x, y)
+    return x >= self.x and x < self.width and y >= self.y and y < self.height
+end
+
+return rect.new

main.lua

@@ -2,7 +2,7 @@
 
 local character = require "lib/character/character"
 require "lib/tree"
-local testLayout = require "lib.simple_ui.level_layout"
+local testLayout = require "lib.simple_ui.level.layout"
 
 function love.conf(t)
     t.console = true