Image is not getting displayed

[shalini gnana]

I want to display an image in the applet..Can anyone say me how to do that..And i want to display the label at specified co-ordinates..How can i do this..

   
package mining;
 
import javax.swing.*;
import java.awt.*;
import javax.swing.border.LineBorder;
 

/**
 *
 * @author 8563
 */
public class Tree extends javax.swing.JApplet 
{
    JLabel label;
    int h = 10;
    int w = 5;
 
    public void init()
    {
        Container cont  = getContentPane();
        JPanel panel   = new JPanel()
        {
            protected void paintComponent(Graphics g) 
    {        
//        super.paintComponent(g);       
        Graphics2D g2 = (Graphics2D)g;        
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); 
        Image img = Toolkit.getDefaultToolkit().getImage("image.gif");
        g.drawImage(img,20,20,this);
        g2.drawString(" etrett",45,45);
        h =  img.getHeight(this);
        w= img.getWidth(this);
        label = new JLabel();
        label.setLocation(30,30);
 
      
    }
        };
        
        cont.setLayout(new BorderLayout());
        panel.setLayout(new BorderLayout());
        cont.add(panel,BorderLayout.CENTER);
        panel.setBorder( new  LineBorder(Color.BLACK));
        //panel.setBorder(BorderFactory.createEmptyBorder());
        panel.setVisible(true);
        cont.setVisible(true);
        
        
    }
   
}

[Craig Wood]

//  <applet code="TreeRx" width="400" height="400"></applet>
import javax.swing.*;
import java.awt.*;
import javax.swing.border.LineBorder;
 
public class TreeRx extends javax.swing.JApplet 
{
    JLabel label;
    int h = 10;
    int w = 5;
 
    public void init()
    {
        Container cont = getContentPane();
        cont.setLayout(new BorderLayout());
        cont.add(new ImagePanel(), BorderLayout.CENTER);
    }
 
    private class ImagePanel extends JPanel
    {
        Image img;
 
        ImagePanel()
        {
            img = Toolkit.getDefaultToolkit().getImage("image.gif");
                                                   //"images/Bird.gif");
            MediaTracker mt = new MediaTracker(this);
            mt.addImage(img, 0);
            try
            {
                mt.waitForID(0);
            }
            catch(InterruptedException e) { }
            h = img.getHeight(this);
            w = img.getWidth(this);
            // For absolute positioning/no layout manager:
            setLayout(null);
            label = new JLabel("hello world");
            Dimension d = label.getPreferredSize();
            add(label);
            label.setBounds(30,30,d.width,d.height);
            setBorder( new LineBorder(Color.BLACK));
        }
 
        protected void paintComponent(Graphics g) 
        {
            super.paintComponent(g); 
            Graphics2D g2 = (Graphics2D)g; 
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                                RenderingHints.VALUE_ANTIALIAS_ON); 
            g.drawImage(img,20,20,this);
            g2.drawString(" etrett",45,45);
        }
    }
}

[shalini gnana]

I want to reduce the size of the image..How can i do it?

[Craig Wood]

Changes:

import java.awt.image.BufferedImage;
...
    private class ImagePanel extends JPanel
    {
        BufferedImage img;
 
        ImagePanel()
        {
            Image image = loadImage();
            img = scaleImage(image, 0.5);
            // For absolute positioning/no layout manager:
            ...
        }
 
        private Image loadImage()
        {
            Image image =
                Toolkit.getDefaultToolkit().getImage(//"image.gif");
                                                     "images/Bird.gif");
            MediaTracker mt = new MediaTracker(this);
            mt.addImage(image, 0);
            try
            {
                mt.waitForID(0);
            }
            catch(InterruptedException e) { }
            return image;
        }
 
        private BufferedImage scaleImage(Image src, double scale)
        {
            int h = (int)(scale*src.getHeight(this));
            int w = (int)(scale*src.getWidth(this));
            int type = BufferedImage.TYPE_INT_RGB;
            BufferedImage dst = new BufferedImage(w, h, type);
            Graphics2D g2 = dst.createGraphics();
            g2.drawImage(src, 0, 0, w, h, this);
            g2.dispose();
            return dst;
        }

[shalini gnana]

I'm working in NetBeans..I exectued the program..Its working well with applet viewer but in IE...I checked the permission too..Everything is well but still its not displaying in IE..What might be the reason?

[shalini gnana]

Its saying that Applet loading failed..
The IE is not accepting the image file(GIF)..What should i have to do to display the image in IE?Please help me..

[ November 13, 2007: Message edited by: shalini gnana ]

[Ulf Dittmer]

Originally posted by shalini gnana:
Its saying that Applet loading failed..

Why does applet loading fail - there should be an exception in the Java Console - what does it say?

[shalini gnana]

My image is not getting loaded..If i comment the image part then its working..

It throws the following error:

ava.security.AccessControlException: access denied (java.io.FilePermission C:\Documents and Settings\8563\JavaApplication2\image\folder.gif read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at sun.awt.SunToolkit.getImageFromHash(Unknown Source)
at sun.awt.SunToolkit.getImage(Unknown Source)
at mining.TreeEX$ImagePanel.<init>(TreeEX.java:41)
at mining.TreeEX.init(TreeEX.java:30)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

[Ulf Dittmer]

access denied (java.io.FilePermission C:\Documents and Settings\8563\JavaApplication2\image\folder.gif read)

Applets can't access the local file system. You need to rewrite the code that uses this file to load the file from the server (or the applet jar file) instead.

[shalini gnana]

No.i'm not getting you..Can you please explain me little bit elobrately...
Please help me..

[Ulf Dittmer]

Show us the code that uses folder.gif. Then it'll be easier to explain what's going wrong, and how to fix it.

[shalini gnana]

   
package mining;
 
/**
 *
 * @author 8563
 */
import javax.swing.*;
import java.awt.*;
import javax.swing.border.LineBorder; 
import java.security.AllPermission;
 
public class TreeEX extends javax.swing.JApplet 
{    
JLabel label;    
int h = 10;    
int w = 5;     
JPanel panel;
public void init()   
 {        
Container cont = getContentPane();        
cont.setLayout(new BorderLayout());       
[B]cont.add(new ImagePanel(), BorderLayout.CENTER);   [/B]
// JScrollPane scroll = new JScrollPane();
// cont.add(scroll,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
 
 }
 
class ImagePanel extends JPanel   
{        
Image img;         
ImagePanel()       
{           
 [B]img = Toolkit.getDefaultToolkit().getImage("C:\\Documents and Settings\\8563\\JavaApplication2\\image\\folder.gif");                                                   [/B]
            
MediaTracker mt = new MediaTracker(this);           
mt.addImage(img, 0);          
  try          
  {                
mt.waitForID(0);          
  }     
          
catch(InterruptedException e) { }            
h = img.getHeight(this);            
w = img.getWidth(this);  
 //For absolute positioning/no layout manager:            
setLayout(null);           
    
label = new JLabel("hello world");         
Dimension d = label.getPreferredSize();  
add(label);          
label.setBounds(33,30,d.width,d.height);
//setBorder( new LineBorder(Color.BLACK));        
 } 
 

protected void paintComponent(Graphics g)         
{            
super.paintComponents(g);            
 Graphics2D g2 = (Graphics2D)g;             
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);             
g.drawImage(img,20,28,this);
g.drawString("SDFsdf",100,100);
    
 } 
 
   }
}
 
 

This is where i'm getting error...
Please help me..

[Rob Spoor]

As said before, you can't access files on the local file system from applets unless you explicitly allow it to. You'll need to set permissions, and most likely sign the applet too.

It's better to use a relative path to the image. If your HTML file is stored in C:\Documents and Settings\8563\JavaApplication2, the following will create a relative URL for you:

URL base = myapplet.getDocumentBase();
URL image = new URL(base, "image\\folder.gif");

[shalini gnana]

Here,myapplet is my applet class name?

[Ulf Dittmer]

No, it's a reference to the applet instance. If this code is inside of the TreeEX class (which extends Applet) then you can just write

URL base = getDocumentBase();

but if the code moves to a different class -which is the case in your code- you'll need a reference to the Applet object. You could pass that into the ImagePanel class in the constructor.

[shalini gnana]

I tried to add in the way you said..But its throwing nullPointer Exception...

    
package javaapplication2;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.*;
import java.awt.*;
import javax.swing.border.LineBorder; 
import java.security.AllPermission; 
public class reg extends javax.swing.JApplet 
{   
    JLabel label;    
     int h = 10;   
     int w = 5;     
     JPanel panel;
     public void init()  
     {        
         Container cont = getContentPane();        
         cont.setLayout(new BorderLayout());
        try {
            cont.add(new ImagePanel(), BorderLayout.CENTER);   
        } catch (MalformedURLException ex) {
            ex.printStackTrace();
        }   
// JScrollPane scroll = new JScrollPane();
// cont.add(scroll,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);  
     }
     class ImagePanel extends JPanel   
     {        
         Image image;        
         ImagePanel() throws MalformedURLException       
         {   
             MediaTracker mt = new MediaTracker(this); 
             mt.addImage(image,0);
             reg myapplet = new reg();   
             URL base = myapplet.getDocumentBase(); 
             URL image = new URL(base, "image\\folder.gif");
 
//             :            
             setLayout(null);               
             label = new JLabel("hello world");         
             Dimension d = label.getPreferredSize();  
             add(label);          
             label.setBounds(33,30,d.width,d.height);
//setBorder( new LineBorder(Color.BLACK));         
         }  
         protected void paintComponent(Graphics g)         
         {            
             super.paintComponents(g);            
             Graphics2D g2 = (Graphics2D)g;            
             g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);             
             g.drawImage(image,20,28,this);g.drawString("SDFsdf",100,100);     
         }     }
}

[Ulf Dittmer]

I tried to add in the way you said..

Actually, no, you didn't. I suggested passing a reference to the applet instance to the ImagePanel class in its constructor. What you did was to try to create a new instance of the applet class:

reg myapplet = new reg();

I mentioned to you that one should never do that in your question about Gantt charts.