// 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 systems = [];

​

function setup() {

  let text = createP("click to add particle systems");

  text.position(10, 365);

​

  createCanvas(640, 360);

​

  systems.push(new ParticleSystem(1,createVector(100,25)));

    for (let i = 0; i < 6; i++) {

    systems.push(new ParticleSystem(1,createVector(random(width),random(height))));

  }

}

​

function draw() {

  background(51);

  for (let i = 0; i < systems.length; i++) {

    systems[i].addParticle();

    systems[i].run();

  }

}

​

function mousePressed() {

  systems.push(new ParticleSystem(1, createVector(mouseX, mouseY)));

}