Return the union of two regions.
union2 computes the union of the region in Region1 with all regions in Region2. This means that union2 is not commutative!
|
Region1 (input_object) |
region(-array) -> object |
| Region for which the union with all regions in Region2 is to be computed. | |
|
Region2 (input_object) |
region(-array) -> object |
| Regions which should be added to Region1. | |
|
RegionUnion (output_object) |
region(-array) -> object |
| Resulting regions. | |
| Number of elements: RegionUnion == Region1 | |
Let F be the sum of all areas of the input regions. Then the runtime complexity is O(F) * F).
union2 always returns TRUE. The behavior in case of empty input (no regions given) can be set via set_system(::'no_object_result',<Result>:) and the behavior in case of an empty input region via set_system(::'empty_region_result',<Result>:). If necessary, an exception is raised.
threshold__, connection, regiongrowing__, pouring