Rotations in applets

Question

how can rotate a picture clockwise or counter-clockwise using applets-URGENT

Answer 1

/*  <applet code="RotatingAnImage" width="400" height="400"></applet>
*  use: >appletviewer RotatingAnImage.java
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class RotatingAnImage extends JApplet
    ImageManager manager;
    RotatingImagePanel imagePanel;
    public void init()
        manager = new ImageManager();
        imagePanel = new RotatingImagePanel(manager.getImage());
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(getUIPanel(), "North");
        getContentPane().add(new JScrollPane(imagePanel));
    private JPanel getUIPanel()
        final JButton
            ccw  = new JButton("ccw"),
            cw   = new JButton("cw"),
            save = new JButton("save");
        ActionListener l = new ActionListener()
            public void actionPerformed(ActionEvent e)
                JButton button = (JButton)e.getSource();
                if(button == ccw)
                    imagePanel.rotate(-1);
                if(button == cw)
                    imagePanel.rotate(1);
                if(button == save)
                    manager.save(imagePanel, imagePanel.theta);
        ccw.addActionListener(l);
        cw.addActionListener(l);
        save.addActionListener(l);
        JPanel panel = new JPanel();
        panel.add(ccw);
        panel.add(cw);
        panel.add(save);
        return panel;
    public static void main(String[] args)
        JApplet applet = new RotatingAnImage();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(applet);
        f.setSize(400,400);
        f.setLocation(200,200);
        applet.init();
        f.setVisible(true);
class RotatingImagePanel extends JPanel
    BufferedImage image;
    double theta, thetaInc;
    public RotatingImagePanel(BufferedImage image)
        this.image = image;
        theta = 0;
        thetaInc = Math.PI/6;  // 30 degrees
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        int w = getWidth();
        int h = getHeight();
        int imageWidth = image.getWidth();
        int imageHeight = image.getHeight();
        int x = (w - imageWidth)/2;
        int y = (h - imageHeight)/2;
        AffineTransform at = AffineTransform.getTranslateInstance(x, y);
        at.rotate(theta, w/2 - x, h/2 - y);
        g2.drawRenderedImage(image, at);
    public Dimension getPreferredSize()
        double cos = Math.abs(Math.cos(theta));
        double sin = Math.abs(Math.sin(theta));
        int w = (int)(image.getWidth() * cos + image.getHeight() * sin);
        int h = (int)(image.getWidth() * sin + image.getHeight() * cos);
        return new Dimension(w, h);
    public void rotate(int direction)
        theta += thetaInc * direction;
        revalidate();
        repaint();
class ImageManager
    BufferedImage image;
    public ImageManager()
        loadImage();
    private void loadImage()
        String fileName = "images/redfox.jpg";
        try
            URL url = getClass().getResource(fileName);
            image = ImageIO.read(url);
        catch(MalformedURLException mue)
            System.err.println("url: " + mue.getMessage());
        catch(IOException ioe)
            System.err.println("read: " + ioe.getMessage());
    public void save(Component c, double theta)
        double cos = Math.abs(Math.cos(theta));
        double sin = Math.abs(Math.sin(theta));
        int w = (int)(image.getWidth() * cos + image.getHeight() * sin);
        int h = (int)(image.getWidth() * sin + image.getHeight() * cos);
        BufferedImage bi = new BufferedImage(w, h, image.getType());
        Graphics2D g2 = bi.createGraphics();
        int x = (c.getWidth() - w)/2;
        int y = (c.getHeight() - h)/2;
        g2.translate(-x, -y);
        c.paint(g2);
        g2.dispose();
        try
            ImageIO.write(bi, "png", new File("rotatingAnImage.png"));
        catch(IOException ioe)
            System.err.println("write: " + ioe.getMessage());
    public BufferedImage getImage()
        return image;
}