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小彭老师，floor((x/2-1/2)*1920)这里减号是不是应该改成加号哇？要不然带入(0，0)都是负的像素了
floor((x/2-1/2)*1920)
小彭老师，
floor((x/2-1/2)*1920)这里减号是不是应该改成加号哇？要不然带入(0，0)都是负的像素了