The window, along with the device-context viewport, defines how GDI maps points in the logical coordinate system to points in the device coordinate system.

• 它和设备上下文窗口一起说明了GDI如何将逻辑坐标中的点映射到实际设备坐标中。换言之，它们说明了GDI如何将逻辑坐标转换为设备坐标。