​

// Mover object

let asteroid;

let boid;

let numBoids = 30;

let flock;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  asteroid = new Asteroid();

  numBoidsSlider = createSlider(0, 100, 30);

  numBoidsSlider.position(10, 10);

​

  flock = new Flock();

  // Add an initial set of boids into the system

  for (let i = 0; i < numBoids; i++) {

    let boid = new Boid(width / 2, height / 2);

    flock.addBoid(boid);

  }

}

​

function draw() {

  background(0, 50);

    let numBoids = numBoidsSlider.value();

  if (numBoids < flock.boids.length) {

    flock.boids.splice(numBoids, flock.boids.length - numBoids);

  } else if (numBoids > flock.boids.length) {

    for (let i = flock.boids.length; i < numBoids; i++) {

      let boid = new Boid(width / 2, height / 2);

      flock.addBoid(boid);

    }

  }

​

  flock.run(asteroid);

​

  // Update position

  asteroid.update();

  // Wrap edges

  asteroid.wrapEdges();

  // Draw ship

  asteroid.show();

​

  // fill(0);

  // text("left right arrows to turn, z to thrust",10,height-5);

​

  // Turn or thrust the ship depending on what key is pressed

  if (keyIsDown(LEFT_ARROW)) {

    asteroid.turn(-0.03);

  } else if (keyIsDown(RIGHT_ARROW)) {

    asteroid.turn(0.03);

  } else if (keyIsDown(UP_ARROW)) {

    asteroid.thrust();

  }

}