Question

谁能帮我修改一下下面的Java程序，点击按钮可以旋转图片

import javax.swing.*;

import java.awt.event.*;
import java.awt.*;
public class lianxi5 extends JFrame{
JPanel jPanel;
JButton jButton;
JLabel jLabel;
Image image;
ImageIcon imageIcon;
float scalew=1;
float scaleh=1;
float xuzh=0;
public lianxi5(){
super("dda");
jPanel=new JPanel();
jButton=new JButton("旋转");
image=Toolkit.getDefaultToolkit().getImage("src/img1.jpg");
imageIcon=new ImageIcon(image);
jLabel=new JLabel();
jLabel.setIcon(imageIcon);
jPanel.add(jLabel);
this.add(jPanel,BorderLayout.NORTH);
this.add(jLabel,BorderLayout.SOUTH);
this.setVisible(true);
this.setSize(600,600);
jButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
turn();
}
});

}
public static void main(String[] args) {
new lianxi5();
}
public void turn(){
int width=image.getWidth(jLabel);
int height=image.getHeight(jLabel);
double scale=1;
scalew=(float)(scalew*scale);
scaleh=(float)(scaleh*scale);
Math ma=new Math();
ma.pow(scalew, scaleh);
ma.round(xuzh=xuzh-5);
Bitmap bitmap=Bitmap

}
}

Answer 1

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package main;
/**
 *
 * @author stcdasqy
 */
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import static main.lianxi3.rotateImage;
public class lianxi5 extends JFrame {
    JPanel jPanel;
    JButton jButton;
    JLabel jLabel;
    Image image;
    ImageIcon imageIcon;
    float scalew = 1;
    float scaleh = 1;
    float xuzh = 0;
    public lianxi5() {
        super("dda");
        jButton = new JButton("旋转");
        image = Toolkit.getDefaultToolkit().getImage("src/img1.jpg");
        imageIcon = new ImageIcon(image);
        jLabel = new JLabel();
        jLabel.setIcon(imageIcon);
        this.add(jLabel, BorderLayout.NORTH);
        this.add(jButton, BorderLayout.SOUTH);
        this.setVisible(true);
        this.setSize(600, 600);
        jButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                turn();
            }
        });
    }
    public static void main(String[] args) {
        new lianxi5();
    }
    public void turn() {
        int width = image.getWidth(jLabel);
        int height = image.getHeight(jLabel);
        double scale = 1.5;
        scalew = (float) (width * scale);
        scaleh = (float) (height * scale);
        
        BufferedImage bufImg = new BufferedImage(image.getWidth(null), image.getHeight(null),BufferedImage.TYPE_4BYTE_ABGR);   
         Graphics g = bufImg .createGraphics();   
         
         g.drawImage(image, 0, 0, null);   
         g.dispose();     
         //imageIcon.setImage(bufImg);
         imageIcon.setImage(rotateImage(bufImg,30));
         jLabel.setIcon(imageIcon);
        jLabel.setSize(imageIcon.getIconWidth(), imageIcon.getIconHeight());
    }
    
    public static BufferedImage rotateImage(final BufferedImage bufferedimage,
            final int degree) {
        int w = bufferedimage.getWidth();
        int h = bufferedimage.getHeight();
        int nw = (int) (bufferedimage.getWidth()*1.414);
        int nh = (int) (bufferedimage.getHeight()*1.414);
        int type = bufferedimage.getColorModel().getTransparency();
        BufferedImage img;
        Graphics2D graphics2d;
        (graphics2d = (img = new BufferedImage(nw, nh, type))
                .createGraphics()).setRenderingHint(
                RenderingHints.KEY_INTERPOLATION,
                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        graphics2d.rotate(Math.toRadians(degree), nw / 2, nh / 2);
        graphics2d.translate(nw/2-w/2, nh/2-h/2);
        graphics2d.drawImage(bufferedimage, 0, 0, null);
        graphics2d.dispose();
        return img;
    }
}

这样就好了

追问

import static main.lianxi3.rotateImage;
这句话是什么来的

追答

显示错误的话，删掉就好。。