IntersectClipRect

The IntersectClipRect function creates a new clipping region from the intersection of the current clipping region and the specified rectangle. 

int IntersectClipRect(
  HDC hdc,       // handle of device context
  int nLeftRect, // x-coordinate of upper-left corner of rectangle
  int nTopRect,  // y-coordinate of upper-left corner of rectangle
  int nRightRect,
                 // x-coordinate of lower-right corner of rectangle
  int nBottomRect 
                 // y-coordinate of lower-right corner of rectangle
);

Parameters

hdc
Handle to the device context.
nLeftRect
Specifies the logical x-coordinate of the upper-left corner of the rectangle.
nTopRect
Specifies the logical y-coordinate of the upper-left corner of the rectangle.
nRightRect
Specifies the logical x-coordinate of the lower-right corner of the rectangle.
nBottomRect
Specifies the logical y-coordinate of the lower-right corner of the rectangle.

Return Values

The return value specifies the new clipping region's type and can be any one of the following values:

Value Meaning
NULLREGION Region is empty.
SIMPLEREGION Region is a single rectangle.
COMPLEXREGION Region is more than one rectangle.
ERROR An error occurred. (The current clipping region is unaffected.)

Remarks

The lower and rightmost edges of the given rectangle are excluded from the clipping region.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in wingdi.h.
  Import Library: Use gdi32.lib.

See Also

Clipping Overview, Clipping Functions, ExcludeClipRect