页面变换将页面坐标映射到设备坐标。

The page transformation maps page coordinates to device coordinates.

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请注意，页面坐标空间的原点在工作区的左上角，情况将总是如此。

Note that the page coordinate space has its origin at the upper-left corner of the client area; this will always be the case.

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因此，坐标 (72, 72) 表示距离页面左下角一英寸的点。

So the coordinate (72, 72) represents the point one inch in from the left and bottom of the page.

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