Object Graphics deleted on paint component

Question

Hello everybody!
I have a question about the object graphics when paint a component in it. I'm trying to paint a component in a image, and after show it in the screen.
The problem is that in order to make it possible, I have to put the function that paint the image inside the code paint() of the principal class.
With this code in one class named: Program:
public void paint(Graphics g){
Graphics2D g2 = (Graphics2D) g.create();      
            gt = new GraphicT(view);   <-HERE IS THE PROBLEM
            g2.setColor(getBackground());
            g2.fillRect(0,0,getWidth(),getHeight());                               
            g2.drawImage(gt.getImage(), 0, 0, this);
...and with this other in other named: GraphicT:
private JComponent view;
private Image image;
private Graphics gaux;
public GraphicT(JComponent view){
        this.view = view;
        this.image = new BufferedImage (view.getWidth(),view.getHeight(),BufferedImage.TYPE_INT_BGR);
        gaux = image.createGraphics();
      //  gaux=image.getGraphics();
        this.view.paint(gaux);       
public BufferedImage getImage(){              
        return this.image;
...I don't want to do it because each time that Program paint , create the image (object) in GraphicT. I want to create the image only one time, I mean to put the class GraphicT inside the Program like a object private. But if I do this, program doesn't paint anything.
Do you know why about this behaviour?
Thanks everybody
Edited by: ginnkk on Feb 5, 2009 3:15 AM

Answer 1

So you want to paint a component to an image and display the image. The reason it works if you put it in the paint() method is becasuse by that time the component has already been made displayable, approprietly sized, and consequently can be painted.
If all you are doing is painting an ordinary JComponent, then it's the approprietly sized part that matters.
Dimension prefSize = myJComponent.getPreferredSize();
myJComponent.setSize(prefSize.width,prefSize.height);
myJComponent.doLayout();
GraphicT gt = new GraphicT(myJComponent);This is more or less the code required to paint the component outside the paint method right after the JComponent has been constructed.