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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| gdi32.lib
| Header File
| wingdi.h
| Unicode
| No
| Platform Notes
| Windows 95: 16-bit coordinates only
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CombineRgn
The CombineRgn function combines two regions and stores the result in a third region. The
two regions are combined according to the specified mode.
int CombineRgn(
HRGN hrgnDest,
| // handle to destination region
| HRGN hrgnSrc1,
| // handle to source region
| HRGN hrgnSrc2,
| // handle to source region
| int fnCombineMode
| // region combining mode
| );
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Parameters
hrgnDest
Identifies a new region with dimensions defined by combining two other
regions. (This region must exist before CombineRgn is called.)
hrgnSrc1
Identifies the first of two regions to be combined.
hrgnSrc2
Identifies the second of two regions to be combined.
fnCombineMode
Specifies a mode indicating how the two regions will be combined. This
parameter can be one of the following values:
Value
| Description
| RGN_AND
| Creates the intersection of the two combined regions.
| RGN_COPY
| Creates a copy of the region identified by hrgnSrc1.
| RGN_DIFF
| Combines the parts of hrgnSrc1 that are not part of hrgnSrc2.
| RGN_OR
| Creates the union of two combined regions.
| RGN_XOR
| Creates the union of two combined regions except for any overlapping areas.
|
Return Values
The return value specifies the type of the resulting region. It can be one of
the following values:
Value
| Meaning
| NULLREGION
| The region is empty.
| SIMPLEREGION
| The region is a single rectangle.
| COMPLEXREGION
| The region is more than a single rectangle.
| ERROR
| No region is created.
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Remarks
The three regions need not be distinct. For example, the hrgnSrc1 parameter can equal the hrgnDest parameter.
See Also
CreateEllipticRgn, CreateEllipticRgnIndirect, CreatePolygonRgn, CreatePolyPolygonRgn, CreateRectRgn, CreateRectRgnIndirect, CreateRoundRectRgn
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