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想得到色块中心坐标和画面中心坐标的差值，但不知道怎么得到画面中心坐标，求赐教
img.width()/2
img.height()/2
好，我试试，多谢了
img.draw_cross(int(img.width()/2),int(img.height()/2))
转换为整型之后就可以了