Java：将背景图片添加到框架中

Question

我试图将背景图像添加到我的框架中，但是我没有做任何工作。

我设计了一种老虎机，该老虎机由添加到容器中的几个面板组成。现在，我正在尝试为框架添加漂亮的背景。

我尝试使用绘画方法。但是，由于我已经在使用绘制方法绘制卷轴图像，因此它无法在背景上运行。

我还尝试添加JLabel，但是当我这样做时，它会覆盖所有内容或被覆盖，这取决于我如何称呼它。以下是我的代码；任何帮助都感激不尽：

import javax.swing.event.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import sun.audio.*;

public class SlotMachine extends JFrame {

    private Container c = getContentPane();

    private ImageIcon handleIcon = new ImageIcon("starWars/slot-handle.png");
    private ImageIcon quitIcon = new ImageIcon("starWars/quit2.jpg");
    private ImageIcon logoIcon = new ImageIcon("starWars/logo3.jpg");
    private ImageIcon BG = new ImageIcon("space.jpg");
    private JButton spin = new JButton("Spin", handleIcon);
    private JButton quit = new JButton("Quit", quitIcon);
    private JLabel logo = new JLabel(logoIcon);
    private JLabel bankTotal = new JLabel("Empire Total");
    private JLabel bankLabel = new JLabel("$1000.00");
    private JLabel playerLabel = new JLabel("$1000.00");
    private JLabel playerTotal = new JLabel("Rebellion Total");
    private Font newFont = new Font("DialogInput",Font.ITALIC, 25);
    private JPanel logoPanel = new JPanel(new BorderLayout());
    private JPanel moneyPanel = new JPanel(new GridLayout(1, 3, 5, 5));
    private JPanel imagePanel;
    private JPanel mainPanel = new JPanel(new BorderLayout());
    private JPanel bankPanel = new JPanel(new GridLayout(2, 1, 5, 5));
    private JPanel playerPanel = new JPanel(new GridLayout(2, 1, 5, 5));
    private JPanel panel = new JPanel(new FlowLayout());
    private SlotMachine.ReelPanel reel1 = new SlotMachine.ReelPanel();
    private SlotMachine.ReelPanel reel2 = new SlotMachine.ReelPanel();
    private SlotMachine.ReelPanel reel3 = new SlotMachine.ReelPanel();
    private AudioPlayer audioPlayer = AudioPlayer.player;
    private AudioDataStream continuousMusic;
    private AudioDataStream winMusic;
    private AudioDataStream force;
    private AudioDataStream force2;
    //private AudioDataStream intro;
    private ContinuousAudioDataStream audioLoop;
    private static final int DELAY = 1000;
    private static final double FUNDS = 1000.00;
    private static final float PRICE = 1;
    private int timerCounter = 0;
    private double bank = FUNDS;
    private double playerMoney = 1000.00;
    private Timer timer = new Timer(DELAY, new SlotMachine.TimeHandler());


public SlotMachine() {

        try {
            FileInputStream inputStream = new FileInputStream(new File("cantina4.wav"));
            AudioStream audioStream = new AudioStream(inputStream);
            AudioData audioData = audioStream.getData();
            continuousMusic = new AudioDataStream(audioData);            
            audioLoop = new ContinuousAudioDataStream(audioData);

            inputStream = new FileInputStream(new File("Cheer.wav"));
            audioStream = new AudioStream(inputStream);
            audioData = audioStream.getData();
            winMusic = new AudioDataStream(audioData);

            inputStream = new FileInputStream(new File("forceNN.wav"));
            audioStream = new AudioStream(inputStream);
            audioData = audioStream.getData();
            force = new AudioDataStream(audioData);

            inputStream = new FileInputStream(new File("force2NN.wav"));
            audioStream = new AudioStream(inputStream);
            audioData = audioStream.getData();
            force2 = new AudioDataStream(audioData);


        } catch (Exception e) {
            e.printStackTrace();
        }

        audioPlayer.start(force);

        // Set the font
        spin.setFont(newFont);
        quit.setFont(newFont);
        bankLabel.setFont(newFont);
        bankTotal.setFont(newFont);
        playerLabel.setFont(newFont);
        playerTotal.setFont(newFont);

        // implements start button
        spin.setVerticalTextPosition(SwingConstants.BOTTOM);
        spin.setHorizontalTextPosition(SwingConstants.CENTER);
        spin.setBackground(Color.GREEN);
        spin.setForeground(Color.WHITE);
        spin.setPreferredSize(new Dimension(100, 370));
        spin.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                audioPlayer.stop(force);
                audioPlayer.stop(force2);
                timer.start();
                reel1.startAnimation();
                reel2.startAnimation();
                reel3.startAnimation();
                spin.setEnabled(false);
                audioPlayer.start(audioLoop);
            }
        });
        // implements quit button    
        quit.setBackground(Color.RED);
        quit.setForeground(Color.WHITE);
        quit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                spin.setEnabled(true);
                reel1.stopAnimation();
                reel2.stopAnimation();
                reel3.stopAnimation();
                timer.stop();
                audioPlayer.stop(continuousMusic);
                audioPlayer.stop(audioLoop);
                audioPlayer.stop(winMusic);
                timerCounter = 0;
                audioPlayer.stop(force);
                audioPlayer.start(force2);
                imagePanel.repaint(); // without this call for repaint,  if you press quit but then choose to cancel
                //  the curent image and the next image would sometimes overlap this repaint may change the images but they do not overlap.
                if (JOptionPane.showConfirmDialog(SlotMachine.this,
                        "Are you sure you want to quit?", "Quit Option",
                        JOptionPane.OK_CANCEL_OPTION) == 0) {
                    audioPlayer.start(force2);
                    System.exit(0);
                }
            }
        });
        // create image panel
        imagePanel = new JPanel(new GridLayout(1, 3, 15, 15));
        imagePanel.setBackground(Color.WHITE);
        imagePanel.add(reel1);
        imagePanel.add(reel2);
        imagePanel.add(reel3);

        // create a panel to hold bank values
        bankTotal.setForeground(Color.WHITE);
        bankLabel.setForeground(Color.WHITE);
        bankPanel.setBackground(Color.GRAY);
        bankPanel.add(bankTotal);
        bankPanel.add(bankLabel);

        // panel to hold player values
        playerTotal.setForeground(Color.WHITE);
        playerLabel.setForeground(Color.WHITE);
        playerPanel.setBackground(Color.GRAY);
        playerPanel.add(playerTotal);
        playerPanel.add(playerLabel);

        // create a panel to add bank and player panels and quit button
        //moneyPanel.setBackground(Color.BLACK);
        moneyPanel.add(bankPanel);
        moneyPanel.add(playerPanel);
        moneyPanel.add(quit);
        moneyPanel.setOpaque(false);

        // this panel adds the reel panel and spin button
        panel.setPreferredSize(new Dimension(650, 350));
        //panel.setBackground(Color.BLACK);
        panel.add(imagePanel);
        panel.add(spin);
        panel.setOpaque(false);

        // create the logo panel
        logoPanel.add(logo);
        //logoPanel.setBackground(Color.BLACK);
        logoPanel.setOpaque(false);

        mainPanel.add(logoPanel, BorderLayout.NORTH);
        mainPanel.add(panel, BorderLayout.CENTER);
        mainPanel.add(moneyPanel, BorderLayout.SOUTH);
        mainPanel.setOpaque(false);

        //////////////////////////////////// background ???????????????????
        /// I could just set backgroung black but i want to add a image


        add(mainPanel, BorderLayout.CENTER);

        setTitle("Slot Machine");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        setSize(950, 750);
        setResizable(false);
        setLocationRelativeTo(null);

    }

    public static void main(String[] args) {
        new SlotMachine();
    }

    public class ReelPanel extends JPanel {

        private final static String IMAGE_NAME = "starWars/icon";
        protected ImageIcon images[];
        private int currentImage = 0;
        private final int ANIMATION_DELAY = 150;
        private final int TOTAL_IMAGES = 12;
        private int width;
        private int height;
        private Timer animationTimer = new Timer(ANIMATION_DELAY, new SlotMachine.ReelPanel.TimerHandler());
        private int index;

        public ReelPanel() {
            try {
                images = new ImageIcon[TOTAL_IMAGES];
                for (int count = 0; count < images.length; count++) {
                    images[ count] = new ImageIcon(IMAGE_NAME + (count + 1) + ".jpg");
                }

                width = images[ 1].getIconWidth();
                height = images[ 1].getIconHeight();
                currentImage = 0;
                index = 0;
                animationTimer.setInitialDelay(0);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        public void paintComponent(Graphics g) {

            super.paintComponent(g);

            images[ currentImage].paintIcon(this, g, 0, 0);

            if (animationTimer.isRunning()) {
                currentImage = (int) (Math.random() * TOTAL_IMAGES);
            }
        }

        public void startAnimation() {

            animationTimer.start();
        }

        public void stopAnimation() {
            animationTimer.stop();
        }

        public int getIndex() {
            return index;
        }

        public Dimension getMinimumSize() {
            return getPreferredSize();
        }

        public Dimension getPreferredSize() {
            return new Dimension(width, height);
        }

        private class TimerHandler implements ActionListener {

            public void actionPerformed(ActionEvent actionEvent) {
                repaint();
                index = currentImage;
            }
        }
    }

    private class TimeHandler implements ActionListener {

        public void actionPerformed(ActionEvent actionEvent) {
            audioPlayer.stop(winMusic);
            ++timerCounter;
            if (timerCounter == 2) {
                reel1.stopAnimation();
            } else if (timerCounter == 3) {
                reel2.stopAnimation();
            } else if (timerCounter == 4) {
                reel3.stopAnimation();
                audioPlayer.stop(continuousMusic);
                audioPlayer.stop(audioLoop);
                timerCounter = 0;
                timer.stop();
                spin.setEnabled(true);
                if (reel1.getIndex() == reel2.getIndex() && reel1.getIndex() == reel3.getIndex()) {
                    if (playerMoney > 0) {
                        playerMoney += bank;
                    } else {
                        playerMoney = bank;
                    }
                    bank = FUNDS;
                    winMusic.reset();
                    audioPlayer.start(winMusic);
                } else {
                    bank += PRICE;
                    playerMoney -= PRICE;
                }

                bankLabel.setText("$" + bank + 0);
                playerLabel.setText("$" + playerMoney + 0);
                if (playerMoney <= 0) {
                    JOptionPane.showMessageDialog(SlotMachine.this,
                            "You are out of funds. GAME IS OVER", "Error", JOptionPane.ERROR_MESSAGE);
                    System.exit(1);
                }
            }
        }
    }
}

Answer 1

1. 将主面板的布局设置为 BorderLayout
2. 创建一个JLabel并将其添加到您的主面板
3. 使用背景图像设置标签的图像图标
4. 将标签的布局设置为您要使用的标签
5. 像往常一样继续将组件添加到标签