CBrush实现画矩形

在新建的MFC单文档文件中，选择类视图，在其中选择视图类，定义一个新的点类型变量myPoint，并在视图类构造函数中初始化为零。在鼠标单击按下事件内将当前点赋给myPoint，在抬起事件中，实现画矩形。

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