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class BouncingBall
{
  PVector _pos;
  PVector _dir;
  float   _dampV;
  PShape  _shape;
  int     _w;
  int     _h;
   
  // constructor 
  BouncingBall(int shapeWidth,int shapeHeight)
  {
    _pos = new PVector(width/2, height/2);
    _dir = new PVector(0,0);
    _dampV = 1;
     
    _w = shapeWidth;
    _h = shapeHeight;
     
    _shape = loadShape("ball1.svg");
  }
   
  // set the new position + direction + dampening
  void set(PVector pos,PVector dir,float dampV)
  {
    _pos = pos.get();
    _dir.add(dir);
    _dampV = dampV;
  }
   
  // update the current position
  void calcPos()
  {
    // curent position shifted
    _pos.add(_dir);
     
    // movement vector modified
    _dir.mult(_dampV);
     
    // test horisontal 
    if(_pos.x + _w/2 > width)
    {
      _dir.x *= -1;
      _pos.x = width - _w/2;
    }
    else if(_pos.x - _w/2 < 0)
    {
      _dir.x *= -1;
      _pos.x = _w/2;
    }
     
    // test vertical 
    if(_pos.y + _h/2 > height)
    {
      _dir.y *= -1;
      _pos.y = height - _w/2;
    }
    else if(_pos.y - _h/2 < 0)
    {
      _dir.y *= -1;
      _pos.y = _h/2;
    }
     
  }
   
  // draw the ball
  void draw()
  {
    calcPos();
     shape(_shape,
          _pos.x,_pos.y,
          _w,_h);
  }
}
 

class BallEx extends BouncingBall
{
  BallEx(int size)
  {
     super(size,size);
  }
 
  void draw()
  {
    super.draw();
    line(0,0,_pos.x,_pos.y);
  }
 
}