Combines the current region with the rectangle region
The mode parameter controls how the combining takes place:
New region replaces existing region
Specifies that the existing region is replaced by the portion of the new region that is outside of the existing region.
Specifies that the existing region is replaced by the portion of itself that is outside of the new region.
Updates this region to the portion of itself that intersects the specified object's interior.
Updates this region to all portions (intersecting and nonintersecting) of itself and all portions of another object
Updates this region to the nonintersecting portions of itself and the specified object's interior
By default, the region is replaced with the input.