class MyGroup  {
  MySolid [] solids;
  int nsolids;


  MyGroup (){
    solids = new MySolid[0];
  }
  /*
  MyGroup(MySolid[] inSolids){
   numSolids = inSolids.length;
   solids = new MySolid[numSolids];
   for(int i=0; i<numSolids; i++)
   solids[i] = new MySolid(inSolids[i].faces);  
   
   }
   */
  void addSolids(MyPoint[] points, float hite){
    nsolids++;
    solids = (MySolid[])append(solids, new MySolid(points,hite));
  }

  //******************
  void draw(){
    sort();
    for(int i=0; i<nsolids; i++)
      solids[i].draw();

  }
  void sort(){
    float[] zc;
    zc = new float[nsolids];
    int knt;
    float centerz;

    // Calculate the centroids of each solid
    for(int i=0; i<nsolids; i++){
      centerz = 0;
      knt = 0;
      for(int j=0; j<solids[i].nfaces; j++){
        for(int k=0; k<solids[i].faces[j].npoints; k++){
          centerz += solids[i].faces[j].points[k].z;
          knt++;
        }
      }
      zc[i] = centerz/knt;
    }

    // Sorting the objects
    for(int i=0; i<nsolids; i++)
      for(int j=0; j<nsolids; j++)
        if(zc[i] > zc[j]){
          MySolid tobj = solids[i];
          solids[i] = solids[j];
          solids[j] = tobj;
          float temp = zc[i];
          zc[i] = zc[j];
          zc[j] = temp;
        }
  }

  //*************
  void rotatex (float angle, MyPoint ref) {
    for(int i=0; i<nsolids; i++)
      solids[i].rotatex(angle, ref);
  }

  //*************
  void rotatey (float angle, MyPoint ref) {
    for(int i=0; i<nsolids; i++)
      solids[i].rotatey(angle, ref);
  }

  //*************
  void rotatez (float angle, MyPoint ref) {
    for(int i=0; i<nsolids; i++)
      solids[i].rotatez(angle, ref);
  }

  //*************
  void scale(float xs, float ys, float zs, MyPoint ref) {
    for(int i=0; i<nsolids; i++)
      solids[i].scale(xs, ys, zs, ref);
  }

  //*************
  void move(float xoff, float yoff, float zoff){
    for(int i=0; i<nsolids; i++)
      solids[i].move(xoff, yoff, zoff);
  }

  void setSelected(boolean what){
    for(int i=0; i<nsolids; i++)
      solids[i].setSelected(what);
  }
   boolean pick(int xmouse, int ymouse){
    for(int i=0; i< nsolids; i++)
      if(solids[i].pick(xmouse,ymouse))
         return true;
    return false;
  } 
}