var sprite = kontra.sprite({
  x: 100,        // starting x,y position of the sprite
  y: 80,
  color: 'red',  // fill color of the sprite rectangle
  width: 20,     // width and height of the sprite rectangle
  height: 40,
  dx: 2          // move the sprite 2px to the right every frame
});

var loop = kontra.gameLoop({  // create the main game loop
  update: function() {        // update the game state
    sprite.update();

    // wrap the sprites position when it reaches
    // the edge of the screen
    if (sprite.x > kontra.canvas.width) {
      sprite.x = -sprite.width;
    }
  },
  render: function() {        // render the game state
    sprite.render();
  }
});

kontra.init(getElementById('game'));
loop.start();    // start the game