haxe - 如何访问 Sprite 2D 上下文？

Question

是否有可能获得 CanvasRenderingContext2D在 Sprite 级别而不是整个 Canvas ？
有没有人试图访问它？任何的想法？

我试过:

child.addEventListener(RenderEvent.RENDER_CANVAS, function(event)
        {
            var renderer:openfl.display.DisplayObjectRenderer = event.renderer;         
            var ctx:CanvasRenderingContext2D = renderer.context;
            ctx.shadowBlur = 20;
            ctx.shadowColor = "black";
        });

但是，我收到错误:

openfl.display.DisplayObjectRenderer has no field context

我将如何访问 Sprite 的 CanvasRenderingContext2D ？

Answer 1

试试这个类型转换 renderer到 CanvasRenderer :

child.addEventListener(RenderEvent.RENDER_CANVAS, function(event)
        {
            var renderer:openfl.display.CanvasRenderer = cast(event.renderer);         
            var ctx:CanvasRenderingContext2D = renderer.context;
            ctx.shadowBlur = 20;
            ctx.shadowColor = "black";
        });