Thread: Image on JPanel ---> Canvas

Hello,

I'm trying to add an Image to my JPanel, but I'm not sure how to add it. I know there are lots of thread like this available, but for me I can't get it working.

I found that for adding picture I can use Canvas. Can you pls help me and show me what I'm doing wrong?

here is the code ....

		Maps = new JPanel();
		mainTab.addTab("Maps", null, Maps, null);
 
		Gcanava canvas = new Gcanava();
		Maps.add(canvas);

Here the mainTab is a JTabbledPanel and I have a Maps panel on it.

Gcanava is different class where I have the code for adding picture:

class Gcanava extends JComponent{
	/**
	 * 
	 */
 
	public void paint(Graphics g){
//		Graphics2D g2 = (Graphics2D) g;
//		
//		Image img = Toolkit.getDefaultToolkit().getImage("pictures/map.jpg");
//		g2.drawImage(img, 100, 100,this);
//		g2.finalize();

Can you please help me.

Thanks

hey,

I change the paint() to paint Component()
[/CODE]
Image img;
Graphics g;

public void paintComponent(Graphics g){

}
public Gcanava(){
try{

img =ImageIO.read(new File("pictures/map.jpg"));

}
catch(IOException e){
g.drawImage(img,0,0,this);
}


}

}
[/CODE]

Where should I change the size? of the Graphics g? or the Image?

And also now, when I do it, the whole JPanel turns into canvas which I dont want to I want to have a some other components there.

How can i do that

I kinda changed it, but now im having problems with these exceptions,why?


at Gcanava.<init>(Gcanava.java:33)
at NewExample.initialize(NewExample.java:343)
at NewExample.<init>(NewExample.java:78)
at NewExample$1.run(NewExample.java:65)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectio nPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

It was : java.lang.NullPointerException :/

Well , line 33 is ---> g.drawImage(img,200,200,this); it used to be set to 0 and 0 but I changed it to 200. And I thought that it will help but it doesnt,why?

I just found that it might be because of the size of the image. The image might be bigger then my frame size. And for this reason I might be having troubles. Is it possible?

Hmm...I can provide you the whole code if you want nd you can see whats happening..

Console says that it's the line 33 which is the g.drawImage(img,200,200,this); but it's kinda weird. how this can give me an nullPointerException when the dimension is given

Wtf!!

Right now I commented out thise part of the code nd use [/CODE]
class Gcanava extends JComponent{
/**
*
*/
Image img;
Graphics g;

public void paintComponent(Graphics g){
Graphics2D g2 = (Graphics2D) g;

Image img = Toolkit.getDefaultToolkit().getImage("images/map.jpg");
g2.drawImage(img, 100, 100,this);
g2.finalize();

}


public Gcanava(){
// try{
//
// img =ImageIO.read(new File("images/map.jpg"));
//
// }
// catch(IOException e){
// g.drawImage(img,200,200,this);
// }
//

}

}
[/CODE]

nd I run it, no exception at all, and even a "border" for the picture appeared on my JPanel why??

Maybe g? I dont know, since the line 33 g.drawImage(); is commented out