位图切割程序，可以通过鼠标左键对位图进行任意裁减与分割，然后保存裁减后的位图，google baidu不到 所以自己实现了一个 希望对需要的朋友有所帮助-Bitmap cutting procedure, through the left mouse button on the digital map arbitrary reduction and segmentation, and then save the bitmap after the reduction, google baidu n