void _initialize()
{
D.assert(begin != null);
D.assert(end != null);
_centerArc = new MaterialPointArcTween(
begin: begin.center,
end: end.center);
_dirty = false;
}
void _initialize()
{
D.assert(begin != null);
D.assert(end != null);
Offset centersVector = end.center - begin.center;
_Diagonal diagonal = ArcUtils._maxBy(ArcUtils._allDiagonals,
(_Diagonal d) => _diagonalSupport(centersVector, d));
_beginArc = new MaterialPointArcTween(
begin: _cornerFor(begin, diagonal.beginId),
end: _cornerFor(end, diagonal.beginId));
_endArc = new MaterialPointArcTween(
begin: _cornerFor(begin, diagonal.endId),
end: _cornerFor(end, diagonal.endId));
_dirty = false;
}
