为JFrame添加背景图!!!!!!!!!!!!

[smi_ling]

请问各位大侠,我想在JFrame中添加一张背景图!!
但在是JFrame中有又有一JPanel,里面以一张可以移动的图片!!
也就是说背景图上面还有一张小图片可以在背景图上面移动!!!
跪求!!!代码

[luckli]

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;

class ImgLabel extends JLabel {
	BufferedImage image,model,dest,img;
	Graphics2D destG,modelG;
    int posx=0,posy=0;
    
	public ImgLabel(BufferedImage im) throws IOException {   
        super();
        this.init(im);
    }
    public void init(BufferedImage im) throws IOException {   
        this.image = im;
    
        dest = new BufferedImage(im.getWidth(), im.getHeight(), BufferedImage.TYPE_INT_ARGB);  
        this.destG = dest.createGraphics();
        this.model = new BufferedImage(im.getWidth(), im.getHeight(), BufferedImage.TYPE_INT_ARGB); 
        this.modelG = model.createGraphics();
        limpaImagem(this.model);
        img = ImageIO.read(new File("图片2的路径"));
        
        montaImagemSobreposta();
        this.setIcon(new ImageIcon(dest));
    }
    public void limpaImagem(BufferedImage im) {
        Graphics2D g2d = im.createGraphics();
        g2d.setColor(Color.WHITE);
        g2d.fillRect(0,0,im.getWidth(),im.getHeight());
    }
 
    private void montaImagemSobreposta() {
        destG.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 1.0f));
        destG.drawImage(this.image, 0, 0, null);

        destG.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1.0f));
        destG.drawImage(this.img, posx, posy, null);
        //System.out.println(posx+"  "+posy);
    }

    public void paintComponent(Graphics g) {
        montaImagemSobreposta();
        g.drawImage(dest, 0, 0, null);
    }
    
    public void mouseDragged(MouseEvent e) {
    	posx = e.getX();
    	posy = e.getY();
    	this.repaint();
    }
 
}
public class Frame1 extends JFrame{
	JPanel pane1 = new JPanel();
	ImgLabel lab3 = null;
	
	Frame1() throws IOException{
		BufferedImage img = null;
		
		try{
			img = ImageIO.read(new File("图片1的路径"));
		}
		catch(IOException e){
			e.printStackTrace();
		}
		lab3 = new ImgLabel(img);
		pane1.setLayout(new BorderLayout());
		pane1.add(lab3,BorderLayout.CENTER);
		
		pane1.addMouseMotionListener(new MouseAdapter(){
		    public void mouseDragged(MouseEvent e) {
		    	lab3.mouseDragged(e);

		    }			
		});
		
		this.add(pane1);
		this.setSize(300,300);
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	public static void main(String[] args) throws IOException{
		Frame1 obj = new Frame1();
	}
}

在路径的地方输入图片的路径，运行后按下鼠标左键拖曳鼠标时图片2会随着鼠标移动
记的要给分啊，O(∩_∩)O~

[huntor]

Swing Hacks中有两篇是添加背景图的，你可以去参考参考

[Tassdars]

JFrame里面是没办法绘图的，只能在JFrame的ContentPane里面绘图，你可以自定义一个JPanel，覆盖paintComponent方法，在里面绘制背景，再把它设置为JFrame的ContentPane

[Tassdars]

import javax.swing.*;

public class Test {
	public static void main(String[] args) {
		JFrame frame = new JFrame();
		frame.setSize(400, 300);
		frame.setContentPane(new ImagePanel("Winter.jpg"));
		frame.setVisible(true);
	}
}

import java.awt.*;
import javax.swing.*;

public class ImagePanel extends JPanel {
	private String imgPath;
	
	public ImagePanel(String imgPath) {
		this.imgPath = imgPath;
	}
	
	@Override
	protected void paintComponent(Graphics g) {
		super.paintComponent(g);
		g.drawImage(new ImageIcon(imgPath).getImage(), 0, 0, getWidth(), getHeight(), null);
	}
}

背景会随着JFrame的大小变化而变化，如果要实现重复等效果，楼主就自己画

[zjjh8877227]

在frame里面放两个panel，第一个panel布满frame作为背景（为panel加背景，上面已经有了），第二就是你自己那个panel（可以移动的）