ArrayList Shapes = new ArrayList();
Background bg;


final int CIRCLE = 0;
final int RECTANGLE = 1;
final int TRIANGLE = 2;

class Shape{

  float x, y, w, h, i, o;
  float r, g, b, a;
  int s;
  float life, birth;
  float weight;
  float step;
  int highlight = 0;
  int threshold;

  Shape() {
    s = (int)random(0, 2);

    r = random(0,255);
    g = random(0,255);
    b = random(0,255);
    a = random(0,2);
    birth = life = random(10000, 50000);

    step = random(1, 10);
    threshold = 120;

    x = random(0, width);
    y = random(0, height);
    switch (s)
    {
    case CIRCLE:
      w = random(1,width/4);
      break;
   // case TRIANGLE:
     /* float er = random(1, width);
      w = x - (er/2);//random(0, x);
      h = y + er;//random(y, height);
      i = x + (er/2);//random(x, width);
      o = y + er;//random(y, height);
      a = 150;
      break;*/
    case RECTANGLE:
    default:
      w = random(1,width/4);
      h = random(1,height/4);
      break;
    }


  }


  void update() {
    switch (s)
    {
    case CIRCLE:
      if( (mouseX - x) * (mouseX - x) + (mouseY - y) * (mouseY - y) <= (w/2*w/2))//(w/1.5)*(w/1.5))
      {
        a += random(0, step);
        life = birth;
      }
      break;
/*
    case TRIANGLE:
      if( (mouseX > x) && (mouseX < x+w) && (mouseY > y) && (mouseY < y+h))
      {
        a += random(0, step);
        life = birth;
      }
      break;*/
    case RECTANGLE:
    default:
      if( (mouseX >= x) && (mouseX <= x+w) && (mouseY >= y) && (mouseY <= y+h))
      {
        a += random(0, step);
        life = birth;
      }
      break;
    }
    if( a > threshold )
      a = threshold;
    --life;
  }

  void render() {

    a = (life/birth) * (a);
    strokeWeight(1);
    stroke(r,g,b, a+20);
    fill(r,g,b, a);

    switch(s)
    {
    case CIRCLE:
      ellipseMode(CENTER);
      ellipse(x, y, w, w);
      break;
   /* case TRIANGLE:
      //  rectMode(CORNERS);
      triangle(x, y, w, h, i, o);
      break; */
    default:
    case RECTANGLE:
      //  rectMode(CORNERS);
      rect(x, y, w, h);
      break; 
    }
  }

  boolean isDead() {
    if( life <= 0 )
    {
      a = random(0,5);
      life = birth = random(100, 500);
      return true;
    }
    return false;
  }
}

class Background {
  float r, g, b;
  float step;

  Background() {
    r = 255;//random(200, 255);
    g = 255;//random(200, 255);
    b = 255;//random(200, 255);
    step = 2;  
  }

  void update() {
    r += random(-step, step);
    g += random(-step, step);
    b += random(-step, step);
  }
  void render() {
    background(r, g, b);
  }
}

void setup()
{
  size(400, 400);
  frameRate(30);
  int shapesize = (int)random(100,500);
  for(int i = 0; i<shapesize; ++i)
    Shapes.add(new Shape());
  bg = new Background();
}

void draw()
{
  // Render our background
  bg.render();

  // Render our Shapes
  for(int i = 0; i<Shapes.size(); ++i)
  {
    Shape temp = (Shape)Shapes.get(i);
    if(temp.isDead()) {
      // Shapes.remove(i);
    }
    temp.render();
    temp.update();
  }
}

void mouseMoved()
{
  // bg.update();
}

void mousePressed()
{
  while( Shapes.size() > 0 )
    Shapes.remove(0);
  int shapesize = (int)random(100,500);
  while( Shapes.size() < shapesize )
    Shapes.add(new Shape());
}