public ArcSegment(LineArtVertex v0, LineArtVertex v1, Vector2d center,
bool?clockwise = null, int?requestedSegments = null)
: base(v0, v1)
{
Center = center;
Clockwise = clockwise ?? SMath.CrossZ(V0.Pos - Center, V1.Pos - Center) < 0;
// XXX: Might be better to come up with something based on RADIANS_PER_PIECE
// and the angle span of the arc.
RequestedSegments = requestedSegments ?? DEFAULT_SEGMENTS;
}