public void refreshImg(RefreshEvent event) {
        WorldModel wm = (WorldModel)event.getSource();
        int win = wm.getWin();
        switch (win) {
            case -1:
                this.imgButton.setImg(GraphicalGameView.loseImg);
                break;
            case 0:
                this.imgButton.setImg(GraphicalGameView.stoicImg);
                break;
            case 1:
                this.imgButton.setImg(GraphicalGameView.winImg);
                break;
            default:
                throw new AssertionError();
        }
    }