窗口(设备坐标和逻辑坐标)
在微软给出的文件中窗口的定义是:
- Occupies a certain portion of the screen.
- May or may not be visible at a given moment.
- Knows how to draw itself.
- Responds to events from the user or the operating system.
它的特性有:A window can usually be resized by the user. For example, it can be stretched on any side, minimized, maximized, and closed.
显示设备是物理坐标分为:设备坐标和逻辑坐标。
设备坐标又有屏幕坐标,窗口坐标,客户区坐标。

逻辑坐标为假想虚拟的,可以理解为我们自己设置的。
SetWindowOrgEx SetWindowExtEx 设置逻辑坐标的原点和范围
SetViewportOrgEx SetViewportExtEx 设置设备坐标的原点和范围
而对于窗口,就是我们运行出的程序窗口。

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