// Daniel Shiffman

// http://natureofcode.com

​

// A reference to our box2d world

let world;

​

// A list for all of our boxes

let boxes = [];

​

function setup() {

  createCanvas(640, 360);

​

  // Initialize box2d physics and create the world

  world = createWorld(new box2d.b2Vec2(0, 0));

​

}

​

function draw() {

  background(0);

​

  // 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);

​

  // Boxes fall from the top every so often

  if (mouseIsPressed) {

    let b = new Box(mouseX, mouseY);

    boxes.push(b);

  }

  // Display all the boxes

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

    boxes[i].display();

  }

}