Joining operations
There are various operations available (illustrated as before and after):
Add—creates a new object from the sum of the selected objects; the color of the lowest object is used.
Subtract—removes overlapped areas of the lowest object. All other selected objects are discarded.
Intersect—creates a new object from the overlapping areas common to all selected objects.
Xor—merges selected objects into a composite object with transparent area where filled regions overlap.
Divide—splits object areas into separate objects; the object from the intersecting area retains the color of the upper object.
Cut away of a fully overlapping object from the object below (the residual object can be deleted).
Object being be split by one or more straight lines or curves.
To implement join operations: