Describes client and screen coordinates.
描述客户端和屏幕坐标。
The current screen coordinates are not valid.
当前屏幕坐标无效。
Notice that the red rectangle has been rotated around the 0, 0 screen coordinates.
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.
请注意，红色矩形已经绕著0,0画面座标旋转。
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