/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://processing-101.sketchpad.cc/sp/pad/view/ro.fikEFLRZLgC/rev.1
 * 
 * authors: 
 *   Brett Bowman

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



Ball [] b;

void setup ()
{
  size (400, 400);
  smooth();
  noStroke();
  b= new Ball[100];

  for (int i=0; i < 100; i++) // this array allows us to initialize 100 instances of b
  {
    b[i]=new Ball(i, i, 10);
  }
}



void draw ()
{
  //background (100);
  //frameRate(30);
  //noStroke();
  //if  (mousePressed)
  { 
    for (int i=0; i < 100; i++)
    {
      b[i].display();
      b[i].updatePosition();
    }
  }
}


class Ball
{ 
  float x, y, d;
  float dx, dy;

  color c;

  Ball (int xPosition, int yPosition, int dia) // constructor
  {
    x=xPosition; 
    y=yPosition;
    d=dia;
    c = color(random(200), random(100), random(200), random(50,150));
    dx = random (5, 10);
    dy = random (5, 10);
  }

  void sparkle ()
  {
    fill (255, 255, 255, 20);
    ellipse (x, y, d+10, d+10);
  }

  void display ()
  { 

    fill (c);
    ellipse(x, y, d, d);
  }

  void updatePosition ()
  {
    x=x+dx;
    y=y+dy;
    if (x>width)
    {
      dx=-dx;
    }
    if (x<0)
    {
      dx=-dx;
    }

    if (y>height)
    {
      dy=-dy;
    }
    if (y<0)
    {
      dy=-dy;
    }
  }
}