我们认定，一个优秀的解决方案应该有一个新的称为RolloverImageIcon的类，我们将在其构造函数中给它提供一张图像，然后，这个类会在绘制图标之前对图标进行操作。

We decided that a good solution would be to have a new class called RolloverImageIcon that was given an image in its constructor and would then manipulate the icon before drawing it.

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创建要在其中绘制图标的矩形。

Creates a rectangle in which to draw the icon.

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矩形的位置确定图标在屏幕上的位置，矩形的大小确定绘制图标的缩放。

The position of the rectangle locates the icon on the screen, and the size of the rectangle determines the scaling of the drawn icon.

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