由于工作区坐标是相对于控件工作区的左上角而言的，所以该属性所返回的矩形的左上角坐标是(0,0)。

Because client coordinates are relative to the upper-left corner of the client area of the control, the coordinates of the upper-left corner of the rectangle returned by this property are (0, 0).

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转换是直接修改坐标系统，这样左上角会发生偏移。

Translation simply changes the coordinate system so that the upper-left corner exists at a new offset.

youdao

坐标(s, t)定义为(0,0)的地方就是纹理的左上角，而(1,1)位于右下角。

Coordinates (s, t) are defined so (0, 0) is the texture's upper left corner and (1, 1) is its lower right corner.

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