// Daniel Shiffman

// http://natureofcode.com

​

let particles = [];

​

function setup() {

  createCanvas(420, 320);

  for (let i = 0; i < 20; i++) {

    if (random(1) < 0.5) {

      particles.push(new Particle(true));

    } else {

      particles.push(new Particle(false));

    }

  }

}

​

function draw() {

  background(0);

​

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

    let particle = particles[i];

    let gravity = createVector(0, 0.1);

    particle.applyForce(gravity);

​

    if (mouseIsPressed) {

      let wind = createVector(0.1, 0);

      particle.applyForce(wind);

    }

​

​

    particle.update();

    particle.checkEdges();

    particle.display();

  }

}