var asteroids;

var ship;

var shipImage, bulletImage, particleImage;

var MARGIN = 40;

​

function setup() {

  createCanvas(800, 600);

​

  bulletImage = loadImage('assets/asteroids_bullet.png');

  shipImage = loadImage('assets/asteroids_ship0001.png');

  particleImage = loadImage('assets/asteroids_particle.png');

​

  ship = createSprite(width/2, height/2);

  ship.maxSpeed = 6;

  ship.friction = 0.98;

  ship.setCollider('circle', 0, 0, 20);

​

  ship.addImage('normal', shipImage);

  ship.addAnimation('thrust', 'assets/asteroids_ship0002.png', 'assets/asteroids_ship0007.png');

​

  asteroids = new Group();

  bullets = new Group();

​

  for(var i = 0; i<8; i++) {

    var ang = random(360);

    var px = width/2 + 1000 * cos(radians(ang));

    var py = height/2+ 1000 * sin(radians(ang));

    createAsteroid(3, px, py);

  }

}

​

function draw() {

  background(0);

​

  fill(255);

  textAlign(CENTER);

  text('Controls: Arrow Keys + X', width/2, 20);

​

  for(var i=0; i<allSprites.length; i++) {

    var s = allSprites[i];

    if(s.position.x<-MARGIN) s.position.x = width+MARGIN;

    if(s.position.x>width+MARGIN) s.position.x = -MARGIN;

    if(s.position.y<-MARGIN) s.position.y = height+MARGIN;

    if(s.position.y>height+MARGIN) s.position.y = -MARGIN;

  }

​

  asteroids.overlap(bullets, asteroidHit);

​

  ship.bounce(asteroids);

​

  if(keyDown(LEFT_ARROW))

    ship.rotation -= 4;

  if(keyDown(RIGHT_ARROW))

    ship.rotation += 4;

  if(keyDown(UP_ARROW))

  {

    ship.addSpeed(0.2, ship.rotation);

    ship.changeAnimation('thrust');

  }

  else

    ship.changeAnimation('normal');

​

  if(keyWentDown('x'))

  {

    var bullet = createSprite(ship.position.x, ship.position.y);

    bullet.addImage(bulletImage);

    bullet.setSpeed(10+ship.getSpeed(), ship.rotation);

    bullet.life = 30;

    bullets.add(bullet);

  }

​

  drawSprites();

​

}

​

function createAsteroid(type, x, y) {

  var a = createSprite(x, y);

  var img = loadImage('assets/asteroid'+floor(random(0, 3))+'.png');

  a.addImage(img);

  a.setSpeed(2.5-(type/2), random(360));

  a.rotationSpeed = 0.5;

  //a.debug = true;

  a.type = type;

​

  if(type == 2)

    a.scale = 0.6;

  if(type == 1)

    a.scale = 0.3;

​

  a.mass = 2+a.scale;

  a.setCollider('circle', 0, 0, 50);

  asteroids.add(a);

  return a;

}

​

function asteroidHit(asteroid, bullet) {

  var newType = asteroid.type-1;

​

  if(newType>0) {

    createAsteroid(newType, asteroid.position.x, asteroid.position.y);

    createAsteroid(newType, asteroid.position.x, asteroid.position.y);

  }

​

  for(var i=0; i<10; i++) {

    var p = createSprite(bullet.position.x, bullet.position.y);

    p.addImage(particleImage);

    p.setSpeed(random(3, 5), random(360));

    p.friction = 0.95;

    p.life = 15;

  }

​

  bullet.remove();

  asteroid.remove();

}

​