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代码说明：

  使用鼠标滚轮进行控制图片的缩放，代码简单明了，有界面，使用鼠标滚轮进行控制图片的缩放，代码简单明了，有界面，使用鼠标滚轮进行控制图片的缩放，代码简单明了，有界面，使用鼠标滚轮进行控制图片的缩放，代码简单明了，有界面，(Use the mouse wheel to control the scaling of the picture, the code simple, have the interface, use the mouse wheel to control the scaling of the picture, the code simple, have the interface, use the mouse wheel to control the scaling of the picture, the code simple, have the interface, use the mouse wheel to control the scaling of the picture, the code simple, have the interface,)