🚀 go-pugleaf

Hello Jason,

I am new to Java and trying to do something very similar to what you are 
doing.

I have an applet that contains a combobox and a JPanel below it.  My 
objective is to paint an image on the JPanel when the user selects a 
title from the drop down list.

At this stage I would be happy just to get an image to draw on the 
JPanel when the applet starts.
I have been unsuccessful so far.

I tried your code and got the same result.

I think I found the problem in your code.  I actually kind of stumbled 
on it by trying two things.

First I created a "176.JPG" image in my root drive and set a breakpoint 
right on the "g.drawImage(image1,0,0,this);" line.  I noticed that the 
image1 variable seemed to have a height and width of "-1".

Second I noticed that if I tried to change the "C:\176.JPG" to a 
"C:\ABC.JPG" the compiler complained about an "illegal escape character" 
...  Which seemed quite strange considering a filename of "C:\ABC.JPG" 
is just as valid as any other.

I then changed your "C:\176.JPG" to "C:\\176.JPG" adding the double 
backslash (addressing the escape character) and wholla!   The image loaded.

I hope this solves your problem.

Unfortunately it doesn't solve mine because I am loading my images using 
the getDocumentBase() function .....

imageArray[0] = getImage(getDocumentBase(), "itaxsystem.jpg");
tracker.addImage(imageArray[0], 0);

In my applet I can paint the image to the applet's entire canvas but not 
just the JPanel's canvas so I am confident that the images are loading 
correctly, just not painting..

I have a thread in the borland.public.jbuilder.applet-issues forum 
entitled "Painting an Image on aJPanel" .  If you can figure out in my 
code why the ImageCanvas component's paint method is not getting called 
let me know.

Reid

Jason Swett wrote:

> I tried writing the following application after reading a bit more.  I
> created my own "ImagePanel" by slightly extending JPanel, but still can't
> get the image to display.  Can you tell me what's wrong with the code?
> Thanks.  (I added a re-paint button just for kicks, but it doesn't
> accomplish anything.)
> 
> package testpaint1;
> 
> import java.awt.*;
> import java.awt.event.*;
> import javax.swing.*;
> 
> public class Frame1 extends JFrame {
>   JPanel contentPane;
>   JButton jButton1 = new JButton();
>   ImagePanel imagePanel1 = new ImagePanel();
> 
>   /**Construct the frame*/
>   public Frame1() {
>     enableEvents(AWTEvent.WINDOW_EVENT_MASK);
>     try {
>       jbInit();
>     }
>     catch(Exception e) {
>       e.printStackTrace();
>     }
>   }
> 
>   /**Component initialization*/
>   private void jbInit() throws Exception  {
> 
>     jButton1.setText("Repaint");
>     jButton1.setBounds(new Rectangle(28, 31, 79, 27));
>     jButton1.addActionListener(new java.awt.event.ActionListener() {
>       public void actionPerformed(ActionEvent e) {
>         jButton1_actionPerformed(e);
>       }
>     });
>     contentPane = (JPanel) this.getContentPane();
>     contentPane.setLayout(null);
>     this.setSize(new Dimension(400, 300));
>     this.setTitle("Frame Title");
>     imagePanel1.setBounds(new Rectangle(28, 79, 227, 132));
>     contentPane.add(jButton1, null);
>     contentPane.add(imagePanel1, null);
>   }
> 
>   /**Overridden so we can exit when window is closed*/
>   protected void processWindowEvent(WindowEvent e) {
>     super.processWindowEvent(e);
>     if (e.getID() == WindowEvent.WINDOW_CLOSING) {
>       System.exit(0);
>     }
>   }
> 
>   void jButton1_actionPerformed(ActionEvent e) {
>     repaint();
>   }
> 
> }
> 
> // Define a custom Jpanel -- with images
> 
> class ImagePanel extends JPanel {
>   public void paintComponent(Graphics g) {
>     super.paintComponent(g);
>     Toolkit toolkit = Toolkit.getDefaultToolkit();
>     Image image1 = toolkit.getImage("C:\176.JPG");
>     g.drawImage(image1,0,0,this);
>   }
> }
> 
> 
>