How to save a portion of an Image as another Image?

import java.awt.*;

import java.awt.image.*;

import javax.swing.*;

public class ImageTest extends JApplet{

Image bg ;

public void init(){

bg = getImage(getDocumentBase(),"xyz.gif");// this is the original image which has to be drawn on the applet

//the image size is say 400 x 400

}

public void start(){}

public void paint(Graphics g)

{

g.drawImage(bg,0,0,this);

g.copyArea(50,50,20,20,40,40);//this copies the area of image at 50,50 and

// width 20 and height 20 at 90,90

/* I want to save the image at 90,90 before by being overwritten by the above

* statement and save it as another image so that I can redraw it later to its

* position

*/

}

}

rajesh.tiwarya at 2007-7-8 1:36:06 >

> You should use code formating when posting code.

>

> Using copyArea inside paint does not overwrite your

> image.

> You can still use your original image, and just draw

> this portion of it using drawImage.

Could you please give the statement to draw the portion of overwritten image using drawImage? (for the example above)

Thanks

rajesh.tiwarya at 2007-7-8 1:36:06 >

// <applet code="ImageTestRx" width="400" height="400"></applet>

import java.awt.*;

import java.awt.geom.AffineTransform;

import java.awt.image.BufferedImage;

import java.io.*;

import javax.imageio.ImageIO;

import javax.swing.*;

public class ImageTestRx extends JApplet {

BufferedImage bg ;

BufferedImage patch;

Rectangle clip = new Rectangle(50, 50, 20, 20);

int dx = 90;

int dy = 90;

boolean firstTime = true;

public void init() {

if(bg == null)

initImages();

}

private void initImages() {

try {

bg = ImageIO.read(new File("images/cougar.jpg"));

} catch(IOException e) {

System.out.println("read error: " + e.getMessage());

}

patch = new BufferedImage(clip.width, clip.height, bg.getType());

Graphics2D g2 = patch.createGraphics();

double x = clip.x + dx;

double y = clip.y + dy;

AffineTransform at = AffineTransform.getTranslateInstance(-x, -y);

g2.drawRenderedImage(bg, at);

g2.dispose();

}

public void start() {

Thread thread = new Thread(runner);

thread.setPriority(Thread.NORM_PRIORITY);

thread.start();

}

public void stop() {

firstTime = true;

}

public void paint(Graphics g) {

Graphics2D g2 = (Graphics2D)g;

g.drawImage(bg,0,0,this);

if(firstTime)

g.copyArea(clip.x, clip.y, clip.width, clip.height, dx, dy);

else {

double x = clip.x + dx;

double y = clip.y + dy;

AffineTransform at = AffineTransform.getTranslateInstance(x, y);

g2.drawRenderedImage(patch, at);

}

g2.setPaint(Color.red);

g2.draw(clip);

g2.fillOval(clip.x+dx-2, clip.y+dy-2, 4, 4);

g2.drawImage(patch, 225, 325, this);

}

private Runnable runner = new Runnable() {

public void run() {

try {

Thread.sleep(3000);

} catch(InterruptedException e) {

System.out.println("interrupted");

}

firstTime = false;

repaint();

}

};

}

crwooda at 2007-7-8 1:36:06 >