/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://processing-101.sketchpad.cc/sp/pad/view/ro.4$cuUO-fD1H/rev.11
 * 
 * authors: 
 *   Pino Trogu
 *   Ben Chun

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



class Ball
{
  int x;
  int y;
  int d;
  color c;

  // constructor - like a setup function for this class
  Ball(int xPosition, int yPosition, int dia)
  {
    x = xPosition;
    y = yPosition;
    d = dia;
    c = color(random(255), random(255), random(255));
  }

  void display()
  {
    fill(c);
    ellipse(x, y, d, d);
  }

  void updatePosition()
  {
    x = x+1;
    if(x > width)
    {
      x = 0;
    }
  }
}


Ball ball1;
Ball ball2;

void setup()
{
  size(400,400);
  smooth();
  ball1 = new Ball(200, 200, 10);
  ball1.c = color(255);
  ball2 = new Ball(100, 100, 50);
}

void draw()
{
  background(0);
  ball1.display();
  ball1.updatePosition();
  
  ball2.display();
  ball2.updatePosition();
}