// Daniel Shiffman

// http://natureofcode.com

​

// Particles are generated each cycle through draw(),

// fall with gravity and fade out over time

// A ParticleSystem object manages a variable size

// list of particles.

​

// an array of ParticleSystems

let emitters = [];

​

function setup() {

  createCanvas(640, 240);

}

​

function draw() {

  background(255);

  for (let emitter of emitters) {

    emitter.run();

    emitter.addParticle();

  }

}

​

function mousePressed() {

  emitters.push(new Emitter(mouseX, mouseY));

}