public Rectangle(DrawingImpl drawing, double x1, double y1, double x2, double y2) : base(drawing)
{
_x1 = x1;
_y1 = y1;
_x2 = x2;
_y2 = y2;
}
public Circle(DrawingImpl drawing, double x, double y, double r) : base(drawing)
{
this._x = x;
this._y = y;
this._r = r;
}
protected AbstractShape(DrawingImpl drawing)
{
this.drawing = drawing;
}