MyPoint[] points;
void setup(){
  points = new MyPoint[8];
  points[0] = new MyPoint(-20., -20., -20.);
  points[1] = new MyPoint( 20., -20., -20.);
  points[2] = new MyPoint( 20., 20., -20.);
  points[3] = new MyPoint(-20., 20., -20.);
  points[4] = new MyPoint(-20., -20., 20.);
  points[5] = new MyPoint( 20., -20., 20.);
  points[6] = new MyPoint( 20., 20., 20.);
  points[7] = new MyPoint(-20., 20., 20.);
}

void draw(){
  background(255);
  strokeWeight(4);
  for(int i=0; i<8; i++)
    point( 50+ points[i].x, 50+ points[i].y);
}

void mouseDragged(){
  int xoff = mouseX - pmouseX;
  int yoff = mouseY - pmouseY;
  for(int i=0; i<points.length; i++){
    points[i].rotatey(radians(xoff));
    points[i].rotatex(radians(yoff));
  }
}