圖形疊加 jlabel 圖像圖標

Question

我正在用java做一個游戲，我的問題是設置背景。 我試過使用g.drawImage()但隨着它每次重繪，導致 fps 下降很多。 所以我通過使用JLabel和ImageIcon設置背景來解決這個 fps 問題。 但是標簽覆蓋了圖形，我該如何解決這個問題？

public class GameScreen extends Screen implements Observer {

private static GameScreen gamescreen;
private Game game;
private JLabel label = new JLabel();
private ImageIcon icon = new ImageIcon("./res/img/bg1.png");

private GameScreen() {
    setGame(Game.getInstance());

    setLayout(null);
    label.setIcon(icon);
    label.setBounds(0, 0, 600, 600);
    
    add(label);
}

public static GameScreen getInstance() {
    if(getGameScreen() == null) {
        setGameScreen(new GameScreen());
    }
    return getGameScreen();
}

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    
    //PaintWorld
    new DrawableWorld().draw(g, getWidth(), getHeight());
    //Paint players
    new DrawablePlayer().draw(g, getWidth(), getHeight(), getGame().getPlayers());
    //Paint hud
    new DrawableHud().draw(g, getWidth(), getGame().getPlayers());
}

@Override
public void update(Observable o, Object arg) {
    repaint();
}
//getters & setters..

例子：

PS：所有 DrawableClasses 都擴展了擴展 JPanel 的 Screen

Answer 1

g.drawImage 是一個非常快（在某種程度上）的操作。 繪圖時是否縮放圖像？ 您是否使用“最高質量”渲染提示？

Answer 2

按照@serg.nechaev回答。

    public class GameScreen extends Screen implements Observer {

private static GameScreen gamescreen;
private Game game;
//New static vars
private static BufferedImage image;
private static Image img;
private static int w = 0;
private static int h = 0;

private GameScreen() {
    setGame(Game.getInstance());
    setImage();
}

public static GameScreen getInstance() {
    if(getGameScreen() == null) {
        setGameScreen(new GameScreen());
    }
    return getGameScreen();
}

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    //Scaling once
    if(w != getWidth() || h != getHeight()) {
        img = getImage().getScaledInstance(getWidth(), getHeight(), Image.SCALE_SMOOTH);
        w = getWidth();
        h = getHeight();    
    }
    else{
        g.drawImage(getImg(), 0, 0, this);  
    }

    //PaintWorld
    new DrawableWorld().draw(g, getWidth(), getHeight());
    //Paint players
    new DrawablePlayer().draw(g, getWidth(), getHeight(), getGame().getPlayers());
    //Paint hud
    new DrawableHud().draw(g, getWidth(), getGame().getPlayers());
}

@Override
public void update(Observable o, Object arg) {
    repaint();
}
//getters & setters..
    public BufferedImage getImage() {
    return image;
}

public void setImage() {
    try {
        GameScreen.image = ImageIO.read(new File("./res/img/bg1.png"));
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

public Image getImg() {
    return GameScreen.img;
}

具有良好 fps 的結果：