- The arc will frequently enclose an angle less than 180 degrees.
For the case, it is possible to define the arc by its endpoints
and its centre (origin) point. For example,
arc 0 1 origin (0 0 0);
When defined in the way, any discrepancy in the arc radius for the
endpoints is resolved by adjusting the origin to ensure that the
average radius is satisfied.
It is also possible to specify a \em flatness factor as a multiplier
of the radius. For example,
arc 0 1 origin 1.1 (0 0 0);
ENH: minor code cleanup for block edges
ENH: expose point appending as polyList::concat
1d08ed9be2