modularizing

flexlove/RoundedRect.lua

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+--[[
+RoundedRect - Rounded Rectangle Helper for FlexLove
+Provides functions for generating and drawing rounded rectangles with per-corner radius control.
+]]
+
+local RoundedRect = {}
+
+--- Generate points for a rounded rectangle
+---@param x number
+---@param y number
+---@param width number
+---@param height number
+---@param cornerRadius {topLeft:number, topRight:number, bottomLeft:number, bottomRight:number}
+---@param segments number? -- Number of segments per corner arc (default: 10)
+---@return table -- Array of vertices for love.graphics.polygon
+function RoundedRect.getPoints(x, y, width, height, cornerRadius, segments)
+  segments = segments or 10
+  local points = {}
+
+  -- Helper to add arc points
+  local function addArc(cx, cy, radius, startAngle, endAngle)
+    if radius <= 0 then
+      table.insert(points, cx)
+      table.insert(points, cy)
+      return
+    end
+
+    for i = 0, segments do
+      local angle = startAngle + (endAngle - startAngle) * (i / segments)
+      table.insert(points, cx + math.cos(angle) * radius)
+      table.insert(points, cy + math.sin(angle) * radius)
+    end
+  end
+
+  local r1 = math.min(cornerRadius.topLeft, width / 2, height / 2)
+  local r2 = math.min(cornerRadius.topRight, width / 2, height / 2)
+  local r3 = math.min(cornerRadius.bottomRight, width / 2, height / 2)
+  local r4 = math.min(cornerRadius.bottomLeft, width / 2, height / 2)
+
+  -- Top-right corner
+  addArc(x + width - r2, y + r2, r2, -math.pi / 2, 0)
+
+  -- Bottom-right corner
+  addArc(x + width - r3, y + height - r3, r3, 0, math.pi / 2)
+
+  -- Bottom-left corner
+  addArc(x + r4, y + height - r4, r4, math.pi / 2, math.pi)
+
+  -- Top-left corner
+  addArc(x + r1, y + r1, r1, math.pi, math.pi * 1.5)
+
+  return points
+end
+
+--- Draw a filled rounded rectangle
+---@param mode string -- "fill" or "line"
+---@param x number
+---@param y number
+---@param width number
+---@param height number
+---@param cornerRadius {topLeft:number, topRight:number, bottomLeft:number, bottomRight:number}
+function RoundedRect.draw(mode, x, y, width, height, cornerRadius)
+  -- Check if any corners are rounded
+  local hasRoundedCorners = cornerRadius.topLeft > 0 or cornerRadius.topRight > 0 or cornerRadius.bottomLeft > 0 or cornerRadius.bottomRight > 0
+
+  if not hasRoundedCorners then
+    -- No rounded corners, use regular rectangle
+    love.graphics.rectangle(mode, x, y, width, height)
+    return
+  end
+
+  local points = RoundedRect.getPoints(x, y, width, height, cornerRadius)
+
+  if mode == "fill" then
+    love.graphics.polygon("fill", points)
+  else
+    -- For line mode, draw the outline
+    love.graphics.polygon("line", points)
+  end
+end
+
+--- Create a stencil function for rounded rectangle clipping
+---@param x number
+---@param y number
+---@param width number
+---@param height number
+---@param cornerRadius {topLeft:number, topRight:number, bottomLeft:number, bottomRight:number}
+---@return function
+function RoundedRect.stencilFunction(x, y, width, height, cornerRadius)
+  return function()
+    RoundedRect.draw("fill", x, y, width, height, cornerRadius)
+  end
+end
+
+return RoundedRect