Engine,

  World,

  MouseConstraint,

  Mouse,

  Constraint

} = Matter;

let BirdMass = 4;

let BoxBounciness = 0.5;

let BirdBounciness = 0.5;

​

​

​

let ground;

const boxes = [];

let bird;

let world, engine;

let mConstraint;

let slingshot;

​

function preload() {

  bimg = loadImage("box.png");

  dimg = loadImage("bird.png");

}

​

function setup() {

  const canvas = createCanvas(600, 400);

  engine = Engine.create();

  world = engine.world;

  ground = new Ground(width / 2, height - 10, width * 2, 20);

  for (let i = 0; i < 3; i++) {

    boxes[i] = new Box(450, 300 - i * 75, 50, 75);

  }

  bird = new Bird(150, 300, 25);

​

  slingshot = new Slingshot(150, 300, bird.body);

​

  const mouse = Mouse.create(canvas.elt);

  const options = {

    mouse: mouse

  }

  mConstraint = MouseConstraint.create(engine, options);

  World.add(world, mConstraint);

}

​

function keyPressed() {

  if (key = ' ') {

    World.remove(world, bird.body);

    bird = new Bird(150, 300, 25);

    slingshot.attach(bird.body);

  }

}

​

function mouseReleased() {

  setTimeout(() => {

    slingshot.fly();

  }, 100);

}

​

function draw() {

  background(0);

  Matter.Engine.update(engine);

  ground.show();

  for (let box of boxes) {

    box.show();

  }

  slingshot.show();

  bird.show();

}