How to create a jpg file for a desired part of the canvas

Question

i hav to create a jpg file from the canvas which contains basic shapes which are drawn using methods like drawOval(),drawRectangle(). i need only a part of the canvas to be saved as a jpg file i.e for example from xpos 50-100 & ypos 200-250.i need all the portions of the shapes already drawn in that area as a jpg file..
can anyone help me?

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
public class CanvasClip extends Canvas implements ActionListener
    Rectangle clip;
    boolean showClip;
    public CanvasClip()
        clip = new Rectangle(50, 50, 150, 150);
        showClip = false;
    public void paint(Graphics g)
        super.paint(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        int w = getWidth();
        int h = getHeight();
        int dia = Math.min(w,h)/4;
        g2.setPaint(getBackground());
        g2.fillRect(0,0,w,h);
        g2.setPaint(Color.blue);
        g2.drawRect(w/16, h/16, w*7/8, h*7/8);
        g2.setPaint(Color.red);
        g2.fillOval(w/8, h/12, w*3/4, h*5/6);
        g2.setPaint(Color.green.darker());
        g2.fillOval(w/2-dia/2, h/2-dia/2, dia, dia);
        g2.setPaint(Color.orange);
        g2.drawLine(w/16+1, h/16+1, w*15/16-1, h*15/16-1);
        if(showClip)
            g2.setPaint(Color.magenta);
            g2.draw(clip);
    public void actionPerformed(ActionEvent e)
        Button button = (Button)e.getSource();
        String ac = button.getActionCommand();
        if(ac.equals("show"))
            showClip = !showClip;
            repaint();
        if(ac.equals("save"))
            save();
    private void save()
        int w = clip.width;
        int h = clip.height;
        BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = img.createGraphics();
        g2.translate(-clip.x, -clip.y);
        paint(g2);
        g2.dispose();
        String ext = "jpg";  // or "png"; "bmp" okay in j2se 1.5
        try
            ImageIO.write(img, "jpg", new File("canvasClip.jpg"));
        catch(IOException ioe)
            System.err.println("write error: " + ioe.getMessage());
    private Panel getUIPanel()
        Button show = new Button("show clip");
        Button save = new Button("save");
        show.setActionCommand("show");
        save.setActionCommand("save");
        show.addActionListener(this);
        save.addActionListener(this);
        Panel panel = new Panel();
        panel.add(show);
        panel.add(save);
        return panel;
    public static void main(String[] args)
        CanvasClip cc = new CanvasClip();
        Frame f = new Frame();
        f.addWindowListener(new WindowAdapter()
            public void windowClosing(WindowEvent e)
                System.exit(0);
        f.add(cc);
        f.add(cc.getUIPanel(), "South");
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
}