7.2 Class arc

The constructor takes either the relangle-keyword or a combination of relbulge and absbulge. The ``bulge'' is meant to be a hint for the greatest distance between the connecting arc and the straight connection between the box-centers. (Default: relangle=45, relbulge=None, absbulge=None)

Note that the bulge-keywords override the angle-keyword.

If both relbulge and absbulge are given, they will be added.