Fireworks

class Particle {
  float x;
  float y;
  float size;
  float speedX;
  float speedY;
  color col;
  int age;
}

ArrayList<Particle> dot;

void setup() {
  size(640,640);

  dot = new ArrayList<Particle>();

  for (int i=0; i<100; i++) {
    /*Particle myDot = new Particle();
    myDot.x = random(640);
    myDot.y = random(640);
    myDot.size = random(20);
    myDot.speed = random(5);
    myDot.col = random(255);
    dot.add(myDot);*/
  }
}

void draw() {
  println(dot.size());
  background(0);
  for (int i=0; i < dot.size(); i++) {
    Particle myDot = dot.get(i);
    noStroke();
    fill(myDot.col);
    ellipse(myDot.x, myDot.y, myDot.size, myDot.size);
    myDot.speedY = myDot.speedY + 0.08;
    myDot.x = myDot.x + myDot.speedX;
    myDot.y = myDot.y + myDot.speedY;
    myDot.age = myDot.age + 1;

  }
  for (int i=0; i < dot.size(); i++) {
    Particle myDot = dot.get(i);
    if (myDot.y > 640 ||  myDot.x > 640 || myDot.y < 0 || myDot.x < 0 || myDot.age > 120) {
      dot.remove(myDot);
    }
  }
}

void mousePressed() {
  for (int i=0; i<1000; i++) {
    Particle myDot = new Particle();
    myDot.age = 0;
    myDot.x = mouseX;
    myDot.y = mouseY;
    myDot.size = random(20);

    float ang = random(360);
    float spd = random(5);
    myDot.speedX = sin(radians(ang)) * spd;
    myDot.speedY = cos(radians(ang)) * spd;
    colorMode(HSB);
    myDot.col = color(random(30),255,255);
    dot.add(myDot);
  }
}