internal BezierGroup()
{
_builder = this;
_from = new Vector2(0, 0);
_fragments = new RangeSet <IBezierFragment>(0);
}
IBezierGroupBuilder IBezierGroupBuilder.from(double x, double y)
{
_from = new Vector2((float)x, (float)y);
_fragments = new RangeSet <IBezierFragment>(x);
return(_builder);
}