CombineRgn function
Combines two regions.
Declaration
function CombineRgn(Dest: HRGN; Src1: HRGN; Src2: HRGN;
fnCombineMode: LongInt): LongIntArguments
Dest | The Handle of the destination region. This region must already exist! |
Src1 | The handle of a region to combine. |
Src2 | The handle of a region to combine. |
fnCombineMode | How the regions are combined. |
Description
The following parameters are present in this function:
- Dest
- The Handle of a region which will receive the result of the operation
- Src1
- One of the two regions to combine
- Src2
- The other region to combine
- fnCombineMode
- The method to use to combine the regions. As for the parameter fnCombineMode, the following constants from the unit LCLType can be used:
- RGN_AND
- The result is the intersection of the two combined regions.
- RGN_COPY
- The result is a copy of the region Src1
- RGN_DIFF
- Combines the parts of Src1 that are not part of Src2.
- RGN_OR
- The result is the union of the two regions.
- RGN_XOR
- The result is the union of two combined regions except for any overlapping areas.
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.