class MyGroup {

  // members of class
  MyShape[] shapes;           // array of shapes
  int numShapes;              //number of shapes
  boolean isSelected = false;     // is this shape selected?


  //********** Constructor
  MyGroup(int numInputShapes, MyShape[] inputShapes){

    numShapes = numInputShapes;
    shapes = new MyShape[numShapes];

    for(int i=0; i<numShapes; i++)
      shapes[i] = inputShapes[i];
  }

  //********** Move
  void move(float xoff, float yoff){

    for(int i=0; i<numShapes; i++)
      shapes[i].move(xoff, yoff);
  }
  //********** Rotate
  void rotate (float angle, MyPoint ref) {
    for(int i=0; i<numShapes; i++)
      shapes[i].rotate(angle, ref);
  }

  //********** Scale
  void scale(float xs, float ys, MyPoint ref){
    for(int i=0; i<numShapes; i++)
      shapes[i].scale(xs, ys, ref);
  }
  void setColor(int r, int g, int b){
    for(int i=0; i<numShapes; i++)
      shapes[i].setColor(r, g, b);
  }
  //*********** centroid
  MyPoint centroid(){
    MyPoint c = new MyPoint(0.,0.);
    for(int i=0; i<numShapes; i++){
      c.x += shapes[i].centroid().x;
      c.y += shapes[i].centroid().y;
    }
    c.x /= numShapes;
    c.y /= numShapes;
    return c;
  }
  //*********** draw
  void draw( ){

    for(int i=0; i<numShapes; i++)
      shapes[i].draw();

  }

  //******** Select
  boolean select(float xpick, float ypick, float tolerance){
    for(int i=0; i<numShapes; i++){
      if(shapes[i].select(xpick, ypick, tolerance)==true){
        isSelected = true; 
        return true;
      }
      else {
        isSelected = false;
      }
    }
    return false;
  }

}