我们还通过使用屏幕坐标（请参阅 help coordinates ，获得关于不同类型坐标系统的讨论）设置原点来控制曲线图显示的位置。

We also control where the graph appears by setting the origin using screen coordinates (see help coordinates for a discussion on the different kinds of coordinate systems).

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放到我们第二个示例程序中的MainLoop调用之前，那么当我们在画布窗口中单击鼠标左键时，画布坐标将显示在屏幕上。

To our second example program just before the call to MainLoop, the program will print out the canvas coordinates to the console whenever we click the left mouse button over the canvas window.

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基于微机原理中汇编语言程序执行的实时性特点，设计了在微机显示器屏幕上画直角坐标系下的动态变化图。

Basing on the well-timed characteristics that the assemble language has when executing. A dynamic diversification chart in rectangular coordinate is designed for display screen.

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