Combining
An application combines two regions by calling the
CombineRgn function. Using this function, an application can combine the intersecting
parts of two regions, all but the intersecting parts of two regions, the two
original regions in their entirety, and so on. Following are five values that
define the region combinations.
Value
| Meaning
|
RGN_AND
| The intersecting parts of two original regions define a new region.
|
RGN_COPY
| A copy of the first (of the two original regions) defines a new region.
|
RGN_DIFF
| The part of the first region that does not intersect the second defines a new
region.
|
RGN_OR
| The two original regions define a new region.
|
RGN_XOR
| Those parts of the two original regions that do not overlap define a new
region.
|
The following illustration shows the five possible combinations of a square
and a circular region resulting from a call to
CombineRgn.
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