接下来，在init方法中添加代码，将鼠标移动处理程序与事件关联起来，然后保存修改。

Next, add into the init method the code to link the mouse movement handler with the event and save all your changes. Your init method should look something like Listing 9.

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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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此事件的处理程序接收鼠标指针所在位置的列索引和行索引。

The handler for this event receives the column index and row index of the mouse pointer position.

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