public Dot(int _number, double _x, double _y, AbstractPoly _owner)
{
this.x = _x;
this.y = _y;
this.number = _number;
this.owner = _owner;
}
public Line(Dot begin, Dot end, AbstractPoly owner)
{
this.begin = begin;
this.end = end;
this.owner = owner;
}