Add player color Venn HUD

game_ui.lua

@@ -0,0 +1,88 @@
+-- Player-facing HUD drawn into gameCanvas. Keeping it here (rather than in
+-- the editor sidebar) means its RGB circles use the same screen blend as the
+-- room, so their overlaps are the real additive colour combinations.
+local GameUI = {}
+
+local channelColor = {
+	red = {1, 0, 0},
+	green = {0, 1, 0},
+	blue = {0, 0, 1},
+}
+
+local vennSize = 32
+local vennLayout = {
+	red = {x = 12, y = 10},
+	green = {x = 20, y = 10},
+	blue = {x = 16, y = 18},
+}
+
+local function drawDottedCircle(x, y, radius, color, dotRadius)
+	local dots = math.max(14, math.floor((2 * math.pi * radius) / (dotRadius * 4)))
+	love.graphics.setColor(color[1], color[2], color[3], 1)
+	for index = 0, dots - 1 do
+		local angle = index / dots * math.pi * 2
+		love.graphics.circle("fill", x + math.cos(angle) * radius, y + math.sin(angle) * radius, dotRadius)
+	end
+end
+
+function GameUI.init()
+	uiVennCanvas = love.graphics.newCanvas(vennSize, vennSize)
+	uiVennCanvas:setFilter("nearest", "nearest")
+end
+
+function GameUI.drawBacking()
+	if not gameUiBox then return end
+	love.graphics.setBlendMode("alpha")
+	love.graphics.setColor(0, 0, 0, 1)
+	love.graphics.rectangle("fill", gameUiBox.x, gameUiBox.y, gameUiBox.w, gameUiBox.h)
+end
+
+function GameUI.drawVennOverlay()
+	if not gameUiBox or not uiVennCanvas then return end
+	local cellSize = width / gridWidth
+	local sidebarWidth = cellSize * 2
+	if gameUiBox.w < sidebarWidth then return end
+
+	love.graphics.setBlendMode("screen")
+	love.graphics.setColor(1, 1, 1, 1)
+	local scale = cellSize / 22
+	local vennWidth = vennSize * scale
+	local left = gameUiBox.x + (gameUiBox.w - vennWidth) / 2
+	love.graphics.draw(uiVennCanvas, left, cellSize * 1.1, 0, scale, scale)
+end
+
+function GameUI.drawColorVenn(room)
+	if not room or not gameUiBox then return end
+	GameUI.drawBacking()
+
+	local cellSize = width / gridWidth
+	local sidebarWidth = cellSize * 2
+	if gameUiBox.w < sidebarWidth or not uiVennCanvas then return end
+
+	love.graphics.setCanvas(uiVennCanvas)
+	love.graphics.clear(0, 0, 0, 0)
+	love.graphics.setBlendMode("screen")
+	local radius = 9
+	local dotRadius = 1
+	local active = {}
+	for _, color in ipairs(room:getActiveColors()) do active[color] = true end
+
+	for _, color in ipairs({"red", "green", "blue"}) do
+		if room.player[color] then
+			local layout = vennLayout[color]
+			local x, y = layout.x, layout.y
+			local rgb = channelColor[color]
+			if active[color] then
+				love.graphics.setColor(rgb[1], rgb[2], rgb[3], 1)
+				love.graphics.circle("fill", x, y, radius)
+			else
+				drawDottedCircle(x, y, radius, rgb, dotRadius)
+			end
+		end
+	end
+
+	love.graphics.setCanvas(gameCanvas)
+	GameUI.drawVennOverlay()
+end
+
+return GameUI