Question

我正在制作一个java游戏，它的核心，它由一个JFrame组成，它拥有一个保存背景图像的JLabel。在项目早期，这一点正在展示中。但是，在我实现了将健康栏和角色放在屏幕上的游戏渲染方法后，背景图像不再显示。这是Game的render（）和main（）方法。

public class Game extends Canvas implements Runnable{
    private static final long serialVersionUID = 1L;
    public static final int WIDTH = 1200, HEIGHT = 600, SCALE = 1;
    public static boolean running = false;
    public Thread gameThread;

    private BufferedImage playerSpriteSheet;
    private ImageManager im;

    private static Player player;
    private static HealthBar healthBars;

    public void init(){
        ImageLoader loader = new ImageLoader();
        playerSpriteSheet = loader.load("/spriteSheet.png");
        SpriteSheet pss = new SpriteSheet(playerSpriteSheet);

        im = new ImageManager(pss);

        player = new Player(0, 0, im);
        healthBars = new HealthBar(200, 200);

        this.addKeyListener(new KeyManager());
    }

    public synchronized void start() {
        if(running)return;
        running = true;
        gameThread = new Thread(this);
        gameThread.start();
    }

    public synchronized void stop() {
        if(!running)return;
        running = false;
        try {
            gameThread.join();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public void run() {
        init();
        long lastTime = System.nanoTime();
        final double amountOfTicks = 60D;
        double ns = 1_000_000_000/amountOfTicks;
        double delta = 0;
        long now = System.nanoTime();

        while(running)
        {
            delta += (now - lastTime)/ns;
            lastTime = now;
            if(delta >= 1)
            {
                tick();
                delta--;
            }
            render();
        }
        stop();
    }

    public void tick() {
        player.tick();
    }

    public void render() {

        BufferStrategy bs = this.getBufferStrategy();
        if(bs == null)
        {
            createBufferStrategy(3); //Use 5 at most
            return;
        }
        Graphics g = bs.getDrawGraphics();

        //RENDER HERE
        player.render(g);
        healthBars.render(g);



        //END RENDER
        g.dispose();
        bs.show();
    }

    public static void main(String[] args)
    {
        JLabel backgroundImage;
        JLabel controlKeyPanel;
        JLabel statusLabel;

        Game game = new Game();
        game.setPreferredSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
        game.setMaximumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));
        game.setMinimumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));

        JFrame frame = new JFrame("Java Game");
        frame.setResizable(false);
        frame.setSize(WIDTH * SCALE, HEIGHT * SCALE);
        frame.setLayout(new BorderLayout());

        backgroundImage = new JLabel(new ImageIcon("/background.png"));

        String htmlButtonGuide = "<html>&#8592   -   Move Left<br>&#8594   -   Move Right<br>A  -  Attack<br>S  -  Fire Gun<br>P  -  Position<br>esc -   Exit</html>";
        controlKeyPanel = new JLabel(htmlButtonGuide);

        statusLabel = new JLabel("Game Status");


        frame.add(backgroundImage, BorderLayout.CENTER); //This should be displaying the background image
        frame.add(controlKeyPanel, BorderLayout.EAST);
        frame.add(statusLabel, BorderLayout.SOUTH);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(game);

        frame.setVisible(true);


        game.start();
    }

    public static Player getPlayer() {
        return player;
    }

}

这是一个问题，我认为问题的一部分是可见的。在render（）方法中有这两行：

player.render(g);
healthBars.render(g);

如果我先放置player.render（g），那么播放器和健康栏都会出现在屏幕上。但是，如果我将healthBars.render（g）放在player.render（g）之前，那么玩家就不会出现。这真让我感到困惑，因为我希望渲染第二个导致第一个被隐藏在后面，但相反的情况发生。有人能指出我正确的方向吗？

Answer 1

BufferStrategy与Swing的效果不佳，因为您已经控制了绘画过程
Canvas不能透明，因此会隐藏其下方的任何内容......
当您使用frame.add(game)时，您正在替换BorderLayout.CENTER

不是混合轻量级（Swing）和重量级（AWT）组件，而是将背景图像绘制为render过程的一部分

public void render() {

    BufferStrategy bs = this.getBufferStrategy();
    if(bs == null)
    {
        createBufferStrategy(3); //Use 5 at most
        return;
    }
    Graphics g = bs.getDrawGraphics();

    //RENDER HERE
    // Paint background here...
    player.render(g);
    healthBars.render(g);



    //END RENDER
    g.dispose();
    bs.show();
}

背景图像不在Java游戏中的JLabel / JFrame中显示

1 个答案: