public void turnLeft() {
		if(speedX > 0) {
			this.speedX = 0;
			this.speedY = speedOfSnake;
		} else if(speedX < 0){
			this.speedX = 0;
			this.speedY = -speedOfSnake;
		} else if(speedY > 0) {
			this.speedY = 0;
			this.speedX = -speedOfSnake;
		} else if(speedY < 0) {
			this.speedY = 0;
			this.speedX = speedOfSnake;
		}
	}