BeginPAth()

掉用CDC类中的SelectClipPath( int nMode )函数 可以对区域进行操作.

CDC::SelectClipPath
BOOL SelectClipPath( int nMode );

Return Value

Nonzero if the function is successful; otherwise 0.

Parameters

nMode

Specifies the way to use the path. The following values are allowed:

RGN_AND The new clipping region includes the intersection (overlapping areas) of the current clipping region and the current path.

RGN_COPY The new clipping region is the current path.

RGN_DIFF The new clipping region includes the areas of the current clipping region, and those of the current path are excluded.

RGN_OR The new clipping region includes the union (combined areas) of the current clipping region and the current path.

RGN_XOR The new clipping region includes the union of the current clipping region and the current path, but without the overlapping areas.