Now why would anyone complain about a native drawing API in the browser?

现在，为何还有人会抱怨浏览器中的一个原生画图 API 呢？

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Flash source of Flash drawing API for some explanation and demonstration by example.

Flash源码，对Flash中绘图api进行了一定解释，并用例子演示。

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Drawing API calls are particularly expensive because they usually create objects, such as the scroll bar, dynamically on the Stage before rendering them via the rasterizer.

绘图api的调用特别昂贵，因为它们通常会创建对象，如滚动条，在通过光栅渲染他们之前动态加载到舞台上。

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