​

function setup() {

  createCanvas(600, 400);

  for (let i = 0; i < 100; i++) {

    particles[i] = new Particle(random(width), random(height));

  }

}

​

function draw() {

  background(0);

  for (let p of particles) {

    p.move();

    p.render();

    p.setHighlight(false);

  }

  for (let p of particles) {

    for (let other of particles) {

      if (p !== other && p.intersects(other)) {

        p.setHighlight(true);

      }

    }

  }

}