新增doGC工具函数，三个模式图标改为代码绘制

Zframework/doGC.lua

@@ -0,0 +1,25 @@
+local gc=love.graphics
+local cmds={
+	move="translate",
+	zoom="scale",
+	rgb="setColor",
+	wid="setLineWidth",
+	line="line",
+	rect="rectangle",
+	circ="circle",
+	poly="polygon",
+}
+return function(L)
+	gc.push()
+		local canvas=gc.newCanvas(L[1],L[2])
+		gc.setCanvas(canvas)
+			gc.origin()
+			gc.setColor(1,1,1)
+			gc.setLineWidth(1)
+			for i=3,#L do
+				gc[cmds[L[i][1]]](unpack(L[i],2))
+			end
+		gc.setCanvas()
+	gc.pop()
+	return canvas
+end

Zframework/init.lua

@@ -26,6 +26,7 @@ VIB=	require"Zframework/vibrate"
 SFX=	require"Zframework/sfx"
 
 LIGHT=	require"Zframework/light"
+DOGC=	require"Zframework/doGC"
 BG=		require"Zframework/background"
 WIDGET=	require"Zframework/widget"
 TEXT=	require"Zframework/text"