请注意，红色矩形已经绕著0,0画面座标旋转。
Notice that the red rectangle has been rotated around the 0, 0 screen coordinates.
当水平座标从0移到200时，椭圆形和矩形也会从红色逐渐变成蓝色。
The ellipse and the rectangle also change gradually from red to blue as the horizontal coordinate goes from 0 to 200.
在所有情况下，矩形左上方的座标都是包含于工作区中，而右下方座标则排除在外。
In all cases, the upper-left coordinate of the rectangle is included in the client area, while the lower-right coordinate is excluded.
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