let world;

let boundaries = []

function setup() {

  angleMode(DEGREES);

  createCanvas(400, 400);

  world = createWorld();

​

  // Add a bunch of fixed boundaries

  boundaries.push(new Boundary(width / 4, height - 5, width / 2 - 50, 10,0));

  boundaries.push(new Boundary(3 * width / 4, height - 50, width / 2 - 50, 10,0));

​

    ps = new ParticleSystem();

}

​

function draw() {

  background(220);

  // We must always step through time!

  let timeStep = 1.0 / 30;

  // 2nd and 3rd arguments are velocity and position iterations

  world.Step(timeStep, 10, 10);

  // Display all the boundaries

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

    // rotate(30*i);

    boundaries[i].display();

  }

  ps.run();

}

​

function mousePressed() {

  ps.create(mouseX,mouseY);

}