initControls() {
        var controls = new Controls();
        $(document).keydown(function(event) {
            controls.keysPressed[event.which] = true;

            if (controls.right in controls.keysPressed || controls.rightAlt in controls.keysPressed) {
                this.direction = 1;
            } else if (controls.down in controls.keysPressed || controls.downAlt in controls.keysPressed) {
                this.direction = 2;
            } else if (controls.left in controls.keysPressed || controls.leftAlt in controls.keysPressed) {
                this.direction = 3;
            } else if (controls.up in controls.keysPressed || controls.upAlt in controls.keysPressed) {
                this.direction = 4;
            } else if (controls.esc in controls.keysPressed) {
                this.direction = 0;
            }
        });

        $(document).keyup(function(event) {
            delete controls.keysPressed[event.which];
        });
    }

    start() {
        this.initCanvas();
        this.initControls();

        var self = this;

        createjs.Ticker.setFPS(60);
        createjs.Ticker.addEventListener("tick",  gameLoop);

        function gameLoop(event) {
            var moveDistance = event.delta/1000*self.moveDistance;
            switch (this.direction) {
                case 1:
                    if (self.canvas.world.regX < self.screenHeight + self.outsideMove) {
                        self.canvas.circle.x += moveDistance;
                        self.canvas.world.regX += moveDistance;
                    }
                    break;
                case 2:
                    if (self.canvas.world.regY < self.screenHeight + self.outsideMove) {
                        self.canvas.circle.y += moveDistance;
                        self.canvas.world.regY += moveDistance;
                    }
                    break;
                case 3:
                    if (self.canvas.world.regX > 0 - self.canvas.spawnPointX + self.circle_size) {
                        self.canvas.circle.x -= moveDistance;
                        self.canvas.world.regX -= moveDistance;
                    }
                    break;
                case 4:
                    if (self.canvas.world.regY > 0 - self.canvas.spawnPointY + self.circle_size) {
                        self.canvas.circle.y -= moveDistance;
                        self.canvas.world.regY -= moveDistance;
                    }
                    break;
                case 0:
                    break;
            }
            self.drawFps();
            self.canvas.update();
        }
    }