class Triangle extends PS
{
     Point pp1,pp2,pp3,cp; double scale=1; 
     int itype=1; 
     
     public Triangle(Point p1, Point p2, Point p3)
     {
       pp1=p1;pp2=p2;pp3=p3;
       pp1.cx=(pp1.px+pp2.px+pp3.px)/3.0;
       pp1.cy=(pp1.py+pp2.py+pp3.py)/3.0;
       pp2.cx=pp1.cx;pp2.cy=pp1.cy;
       pp3.cx=pp1.cx;pp3.cy=pp1.cy;
      }

    void move(double x, double y)
      {
         pp1.move(x, y);pp2.move(x,y);pp3.move(x, y);
      }
//
//
    void center(double x, double y)
       {
        pp1.center(x, y);pp2.center(x,y);pp3.center(x,y);
      }
//
    void rotate(double theta)
       { 
        pp1.rotate(theta);pp2.rotate(theta);pp3.rotate(theta);
       }
//
//    void expand(double times)
//       { 
//        px=cx+(px-cx)*times;
//        py=cy+(py-cy)*times;
//      }


    void draw()
       {
       double x1, y1, x2, y2, x3, y3;

       this.linewidth(2.0);
       this.plot(pp1.px, pp1.py, 3);this.plot(pp2.px, pp2.py, 2);this.plot(pp3.px, pp3.py, 2);
       this.closepath();this.stroke();
      }
}