Rotate both image and a panel drawan on it

Question

Hi all,
I need to perform this task:
1. Display an image on the screen
2. Position a Jpanel on the image
3. Rotate the Image with the help of mouse
4. JPanel should be rotated accordingly.
I need help regarding the classes to use to perform it.
Thanks in advance,

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.MouseInputAdapter;
public class SpinningContext extends JPanel {
    BufferedImage image;
    double theta = 0;
    SpinningContext(BufferedImage image) {
        this.image = image;
        setLayout(null);
        JPanel panel = new JPanel();
        panel.setBackground(Color.red);
        Dimension d = getPreferredSize();
        int w = 40;
        int h = 50;
        int x = (d.width - w)/2;
        int y = (d.height - h)/2;
        panel.setBounds(x, y, w, h);
        add(panel);
    protected void paintComponent(Graphics g) {
        int w = getWidth();
        int h = getHeight();
        int x = (w - image.getWidth())/2;
        int y = (h - image.getHeight())/2;
        g.drawImage(image, x, y, this);
    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D)g;
        Rectangle r = getBounds();
        g2.setColor(getBackground());
        g2.fill(r);
        double x = r.getCenterX();
        double y = r.getCenterY();
        AffineTransform at = AffineTransform.getRotateInstance(theta, x, y);
        g2.setTransform(at);
        super.paint(g);
    public Dimension getPreferredSize() {
        return new Dimension(400,400);
    public void setTheta(double theta) {
        this.theta = theta;
        repaint();
    public static void main(String[] args) throws IOException {
        String path = "images/geek/geek----t.gif";
        BufferedImage image = ImageIO.read(new File(path));
        SpinningContext test = new SpinningContext(image);
        ContextSpinner spinner = new ContextSpinner(test);
        test.addMouseListener(spinner);
        test.addMouseMotionListener(spinner);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test);
        f.pack();
        f.setLocation(200,200);
        f.setVisible(true);
class ContextSpinner extends MouseInputAdapter {
     SpinningContext component;
     Point2D.Double center = new Point2D.Double();
     boolean dragging = false;
     double theta;
    ContextSpinner(SpinningContext sc) {
        component = sc;
    public void mousePressed(MouseEvent e) {
        Rectangle r = component.getBounds();
        center.setLocation(r.getCenterX(), r.getCenterY());
        theta = getTheta(e.getPoint());
        dragging = true;
    public void mouseReleased(MouseEvent e) {
        dragging = false;
    public void mouseDragged(MouseEvent e) {
        if(dragging)
            component.setTheta(getTheta(e.getPoint())-theta);
    private double getTheta(Point p) {
        double dy = p.y - center.y;
        double dx = p.x - center.x;
        return Math.atan2(dy, dx);
}Image from:
http://java.sun.com/docs/books/tutorial/uiswing/examples/components/index.html