CDC::SetViewportExt

  • Article

virtualCSizeSetViewportExt(intcx**,intcy);**

virtualCSizeSetViewportExt(SIZEsize**);**

Return Value

The previous extents of the viewport as a CSize object. When an error occurs, the x- and y-coordinates of the returned CSize object are both set to 0.

Parameters

cx

Specifies the x-extent of the viewport (in device units).

cy

Specifies the y-extent of the viewport (in device units).

size

Specifies the x- and y-extents of the viewport (in device units).

Remarks

Sets the x- and y-extents of the viewport of the device context. The viewport, along with the device-context window, defines how GDI maps points in the logical coordinate system to points in the coordinate system of the actual device. In other words, they define how GDI converts logical coordinates into device coordinates.

When the following mapping modes are set, calls to SetWindowExt and SetViewportExt are ignored:

MM_HIENGLISH MM_LOMETRIC
MM_HIMETRIC MM_TEXT
MM_LOENGLISH MM_TWIPS

When MM_ISOTROPIC mode is set, an application must call the SetWindowExt member function before it calls SetViewportExt.

CDC Overview |  Class Members |  Hierarchy Chart

See Also   CDC::SetWindowExt, CSize, CDC::GetViewportExt