在Windows中它是非常快的，因为Windows允许创建一个本地分配图像可以从Windows接收的绘制画布。
In Windows it is very fast because Windows allows creating a locally allocated image which can receive drawings from a Windows Canvas.
现在我们有了一张画布，让我们绘制一些标记来显示沿着标尺的不同点。
Now that we have a canvas, let's draw marks to show the various points along the ruler.
只要一支手写笔，或者一只鼠标，用户就可以在画布上绘制图片，且这并不需要程序员来跟踪或处理任何事件。
Using a stylus, or alternately a mouse, users can draw on the canvas without the developer needing to directly deal with tracking events.
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