Zoom Image in Java

In an organization there are many enterprise java or normal java application that includes images to display, for that one can easily put an image in jPanel or draw it on a Canvas... but to zoom that in to get the most details or highlight some important parts of image... i had been in a similar situation couple of days back... i ask my friend Google for it... it does not give me any pure solution to my problem but it gives me clues which were very helpful and i was able to complete that application in time and get appreciation from my boss as well :) ... now i want to share my Zoom Utility with the world.

it is very simple and easy ... first i get the images, which is a screen shot basically, using java's built in Class Robot and paint it in a JFrame and just scale that image ... i use a screen shot of the screen as that was my requirement you can also create an image from a file ... for that

// remove this portion ...
Robot r= new Robot();
Rectangle rect = new Rectangle(0,0,d.width,d.height);
img = r.createScreenCapture(rect);

// with this...
img=Toolkit.getDefaultToolkit().getImage("PATH_TO_IMAGE");

my zoom application will look like something like that ... ofcourse it is not the original application :)

left click will trigger zoom-in function and right click will trigger zoom-out function... the complete code of my Zoom application was somthing like this

Source Code

class ZoomFrame extends JFrame implements WindowListener, ComponentListener,MouseListener  {
    Image img;
    boolean bo = true;
    static double amount=2;

    public ZoomFrame(){
        setSize(150,150);
        setVisible(true);
        setTitle("Zoom Utility - www.tutorialjinni.com ");
        capture();
        addMouseListener(this);
        addWindowListener(this);
        addComponentListener(this);
    }
    public void capture(){
        Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
        try {
            Robot r= new Robot();
            Rectangle rect = new Rectangle(0,0,d.width,d.height);
            img = r.createScreenCapture(rect);
            /*
            *  You can also put here image like...
            *  img=Toolkit.getDefaultToolkit().getImage("PATH_TO_IMAGE");
            */
        }
        catch(Exception e) {
            System.out.println(e);
        }
    }
    @Override
    public void paint(Graphics g){
        Graphics2D g2=(Graphics2D)g;
        g2.scale(amount,amount);
        g2.drawImage(img,0,0,getWidth(),getHeight(),getX(),getY(),getX()+getWidth(),getY()+getHeight(),this);

    }
    @Override
    public void update(Graphics g){
        paint(g);
    }
    public void windowClosing(WindowEvent we){
        this.dispose();
        //System.exit(0);
    }

    void zoomIn(){
        amount=amount+.5;
        repaint();
    }
    void zoomOut(){
        if(amount>1){
           amount=amount-.5;
        }
        repaint();
    }
    public void windowClosed(WindowEvent we){
        //setVisible(false);
        System.exit(1);
    }
    public void windowOpened(WindowEvent we){}
    public void windowIconified(WindowEvent we){}
    public void windowDeiconified(WindowEvent we){}

    public void windowActivated(WindowEvent we){
        if (bo == false){
            setVisible(false);
            capture();
            bo = true;
            setVisible(true);
        }
        else{
            bo = false;
        }
    }

    public void windowDeactivated(WindowEvent we){

    }

    public void componentMoved(ComponentEvent ce){
        repaint();
    }

    public void componentHidden(ComponentEvent ce){

    }
    public void componentShown(ComponentEvent ce){}
    public void componentResized(ComponentEvent ce){}

    public void mouseClicked(MouseEvent e) {
        switch(e.getModifiers()){
            case InputEvent.BUTTON1_MASK:{
                zoomIn();
                break;
            }
            case InputEvent.BUTTON3_MASK:{
                zoomOut();
                break;
            }
        }
    }

    public void mousePressed(MouseEvent e) {
       // throw new UnsupportedOperationException("Not supported yet.");
    }

    public void mouseReleased(MouseEvent e) {
       // throw new UnsupportedOperationException("Not supported yet.");
    }

    public void mouseEntered(MouseEvent e) {
        //throw new UnsupportedOperationException("Not supported yet.");
    }

    public void mouseExited(MouseEvent e) {
        //throw new UnsupportedOperationException("Not supported yet.");
    }
}

you can also download a Netbeans Project so can start working immediately ...

Download Free Source Code to Zoom Image in JAVA