let emitter;

​

//{!1} One repeller

let repeller;

​

function setup() {

  createCanvas(640 , 240);

  emitter = new Emitter(width / 2, 60);

  repeller = new Repeller(width / 2, 250);

}

​

function draw() {

  background(255);

  emitter.addParticle();

  // We’re applying a universal gravity.

  let gravity = createVector(0, 0.1);

  emitter.applyForce(gravity);

  //{!1} Applying the repeller

  emitter.applyRepeller(repeller);

  emitter.run();

​

  repeller.show();

}