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The rect function draws a rectangle, with the first two points defining the location and the next two defining width and height, respectively.

rect函数可绘制一个矩形，并且前两个点定义位置，而后面两个点则分别定义宽度和高度。

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The paint structure contains a rect data structure that has the smallest rectangle that completely encloses the update region and a flag that specifies whether the background has been erased.

绘图结构中包含了一个RECT数据结构，它包含了完全封闭更新区域的最小矩形以及一个标志，指明背景是否需要擦除。

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