JPanel as Image

Hi everyone....im now writing here cos i m wondering what is the easiest way to save content of JPanel as jpg , gif or any other image...cos thats basically a file with certaing extension.
I would like to save this content of JPanel through JFile Chooser (file dialog) , but when i try to use for example: File myFile=new File(fileName+fileExtension) nothing happens...no file is created or saved.(?)

java does not support witing in the .gif format; only reading. I believe .gif writers are available via open source (google). For the .jpg you might try experimenting with different BufferedImage types - see the field summary section of the api for these. Also you might experiment with this (pseudo-code)
// inside your graphic component, eg JPanel
GraphicsConfiguration gc = getGraphicsConfiguration();
BufferedImage compatImage = gc.createCompatibleImage(w, h);
// get the graphics context reference
// and hand it to the components paint method
// and carry on as beforeAnd you might consider setting RenderingHints in your painting code, egs, antialiasing and fractionalmetrics - see api for options.

Similar Messages

Converting JPanels as image objects

hi,
i am having problem in converting a JPanel object which consits of some
JLabels and images into a Image Object. Actually i want to save the JPanel as
a jpg file which i will do with jped encoder.
so please help me in converting this JPanel to image object

assuming the panel is showing.... (if not, you might need to user getPreferredSize() and setVisible before paint()).
Dimension size = panel.getSize();
BufferedImage bi = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = bi.createGraphics();
comp.paint(g2d);

JPanel and image (alreday discussed) why this is not working ?

import javax.swing.*;
import java.awt.*;
public class test{
        private static void createAndShowGUI() {
              JFrame frame = new JFrame("HelloWorldSwing");
              frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              //JLabel label = new JLabel("Hello World");
              //frame.getContentPane().add(label);
              Image img = Toolkit.getDefaultToolkit().getImage("fond.jpg");
              DrawingPanel drawingPanel = new DrawingPanel(img);
              frame.getContentPane().add(drawingPanel);
              frame.pack();
              frame.setVisible(true);
        public static void main(String[] args) {
              //Schedule a job for the event-dispatching thread:
              //creating and showing this application's GUI.
              javax.swing.SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                          createAndShowGUI();
class DrawingPanel extends JPanel {
        private Image img = null;
        DrawingPanel(Image image)
        { img = image; }
        public void paintComponent(Graphics g) {
              // First paint background unless you will
              // paint whole area yourself.
              super.paintComponent(g);
              // Use the image width & height to find the starting point
              int msgX = getSize().width/2 - img.getWidth(this);
              int msgY = getSize().height/2 - img.getHeight(this);
              //Draw image at centered in the middle of the panel
              g.drawImage(img, msgX, msgY, this);
}

well yes if i do this, the label will appear but not
the drawing on the jpannel.Ahh, now you write this. If I were you, I'd stop using Image and start using BufferedImage -- it's
easier to work with. This post gives you the basics: http://forum.java.sun.com/thread.jsp?forum=20&thread=522483

Problem with jpanel and image

i have a jinternalframe with gridbaglayout which has several jpanels. one of the jpanels has to display an image.
i have searched through the forum and i have made a method to draw the image,
but the problem is that when i added to the jpanel the last (jpanel) gets much bigger and as a result to break down the layout.
any help is appreciated!

i have searched through the forum and i have made a method to draw the image,Just add the image to a JLabel.
when i added to the jpanel the last (jpanel) gets much bigger[url http://java.sun.com/docs/books/tutorial/uiswing/layout/visual.html]How to Use Layout Managers

JPanel with Image just doesn't want to show

Hello,
i am trying to create a JPanel with a JLabel to which i assign an ImageIcon, but for some reason the JPanel seems not to appear in my JFrame.
Here's the code: private void jbInit() throws Exception
    NumberListener numListener = new NumberListener();
    frame = new JFrame();
    frame.setTitle("Error Manager");
    frame.setLayout(new GridBagLayout());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gbc.gridwidth = 1;
    gbc.gridheight = 1;
    gbc.weightx = 1;
    gbc.weighty = 1;
    gbc.gridx = 0;
    gbc.gridy = 0;
    numberList = new JList(numbers);
    numberList.addListSelectionListener(numListener);
    numberList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    JScrollPane listScroller = new JScrollPane(numberList);
    listScroller.setPreferredSize(new Dimension(250, 80));
    frame.getContentPane().add(listScroller, gbc);
    imgPanel = new JPanel();
    imgPanel.setSize(300, 250);
    Toolkit toolkit = Toolkit.getDefaultToolkit();
    Image img = toolkit.createImage("Somepic.png");
    imgPanel.add(new JLabel(new ImageIcon(img)));
    gbc.gridx = 1;
    gbc.gridy = 0;
    frame.getContentPane().add(imgPanel, gbc);
    frame.pack();
    frame.setVisible(true);
}

Sorry forgot to close the code tags...
private void jbInit() throws Exception
    NumberListener numListener = new NumberListener();
    frame = new JFrame();
    frame.setTitle("Error Manager");
    frame.setLayout(new GridBagLayout());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gbc.gridwidth = 1;
    gbc.gridheight = 1;
    gbc.weightx = 1;
    gbc.weighty = 1;
    gbc.gridx = 0;
    gbc.gridy = 0;
    numberList = new JList(numbers);
    numberList.addListSelectionListener(numListener);
    numberList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    JScrollPane listScroller = new JScrollPane(numberList);
    listScroller.setPreferredSize(new Dimension(250, 80));
    frame.getContentPane().add(listScroller, gbc);
    imgPanel = new JPanel();
    imgPanel.setSize(300, 250);
    Toolkit toolkit = Toolkit.getDefaultToolkit();
    Image img = toolkit.createImage("1_Alpinweiss_III.png");
    imgPanel.add(new JLabel(new ImageIcon(img)));
    gbc.gridx = 1;
    gbc.gridy = 0;
    frame.getContentPane().add(imgPanel, gbc);
    frame.pack();
    frame.setVisible(true);
}

Save JPanel as Image

. How does one go about saving a JPanel and its contents to an Image (JPeG, or any other format)? I have tried Double Buffering, but it seems to always capture all the "junk" that is around the JPanel (such as buttons, borders, JFileChoosers, etc.)
. Any ideas would be greatly appreciated.

You can create an image and draw the content of any JPanel with its paint method:
int width = panel.getWidth();
int height = panel.getHeight();
Image image = panel.createImage(width, height);
Graphics g = image.getGraphics();
panel.paint(g);

JPanel Multipe Images are cutoff (layout problem I think)

I am adding images (custom JPanel: Entity class) to a JPanel but the images are getting cut off. I was originally trying BorderLayout but that only worked for one image and adding others added image cut-off the first or completely removed the original image all together. So I switched to other layouts and the closest I could get was BoxLayout however that adds a very large cut-off which is not acceptable either.
So basically; How can I add images (from a custom JComponent) to a custom JPanel without bad effects such as the one present in the code.
How do I go about adding images from Entity class to a JPanel without them getting cutoff or not showing at all?
Note: the images need to animate.
Entity Class:
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import javax.swing.JComponent;
public class Entity extends JComponent implements Runnable {
private BufferedImage bImg;
private int x = 20;
private int y = 20;
private int entityWidth, entityHeight;
public void run() {
bImg = loadBImage("test.png", bImg);
entityWidth = bImg.getWidth();
entityHeight = bImg.getHeight();
setPreferredSize(new Dimension(entityWidth, entityHeight));
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.drawImage(bImg, x, y, null);
g2d.dispose();
public BufferedImage loadBImage(String filename, BufferedImage tmpBI) {
try {
tmpBI = ImageIO.read(getClass().getResource(filename));
} catch (Exception e) { }
return tmpBI;
public int getEntityWidth() { return entityWidth; }
public int getEntityHeight() { return entityHeight; }
public int getX() { return x; }
public int getY() { return y; }
public void setX(int x) { this.x = x; }
public void setY(int y) { this.y = y; }
}Main:
import java.awt.EventQueue;
import javax.swing.JFrame;
public class MainWindow
public static void main(String[] args) {
new MainWindow();
private JFrame frame;
private GraphicsPanel gp = new GraphicsPanel();
MainWindow() {
EventQueue.invokeLater(new Runnable() {
public void run() {
frame = new JFrame("Graphics Practice");
frame.setSize(680, 420);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(gp);
}Graphics Panel: This is where the problem arrises.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JPanel;
import javax.swing.Timer;
public class GraphicsPanel extends JPanel implements MouseListener {
private Entity entity;
private Entity ent2;
private Timer timer;
private long startTime = 0;
private int numFrames = 0;
private float fps = 0.0f;
GraphicsPanel() {
entity = new Entity();
entity.setOpaque(false);
Thread t1 = new Thread(entity);
t1.start();
ent2 = new Entity();
entity.setOpaque(false);
Thread t2 = new Thread(ent2);
ent2.setX(100);
ent2.setY(100);
t2.start();
//ESSENTIAL
setLayout(new BorderLayout());
//COMMENT OUT add(ent2) to see the problem. Any image will do.
add(entity);
add(ent2);
//GAMELOOP
timer = new Timer(30, new Gameloop(this));
timer.start();
addMouseListener(this);
@Override
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
g2.setClip(0, 0, getWidth(), getHeight());
g2.setColor(Color.BLACK);
g2.drawString("FPS: " + fps, 1, 15);
public void getFPS()
++numFrames;
if (startTime == 0) {
startTime = System.currentTimeMillis();
} else {
long currentTime = System.currentTimeMillis();
long delta = (currentTime - startTime);
if (delta > 1000) {
fps = (numFrames * 1000) / delta;
numFrames = 0;
startTime = currentTime;
public void mouseClicked(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
class Gameloop implements ActionListener
private GraphicsPanel gp;
Gameloop(GraphicsPanel gp) {
this.gp = gp;
public void actionPerformed(ActionEvent e) {
try {
gp.getFPS();
gp.repaint();
} catch (Exception ez) { }

You got a bit of a concurrency time bomb on your hands with those Entity threads of yours. Your Entity class also inadvertently overrides Component#getX() and Component#getY() to return where the image is painted within the component. That can't be good. I'm also not sure how your Entity class is functionally different from a simple JLabel with an ImageIcon and a (20,20,20,20) empty border.
But as for your immediate problem: 1) Use FlowLayout for your Graphics panel, 2) Include a revalidate() call after you set the preferred size in the run() method of your Entity class 3) Don't override Component#getX() and Component#getY() in your Entity class and 4) Add the GraphicsPanel to the frame before, not after, you make the frame visible.

Screen dump of JPanel to Image

I'm working on an extensive error dialog which will send all relevant information to a support apparatus. This includes collecting the stack-trace received from the exception, java console log and a screen dump of the underlying JPanel.
The dialog is a modal dialog residing on top of the JPanel in question. I can retreive the parent panel's Graphics object and need to print the JPanel with all it's children to an Image object.
This should be possible, but how?
Another thing, is the java console available from the client code? The code runs as an applet on Windows clients.

I've never tried this, but the idea I have is to create a BufferedImage, and getGraphics() of the BufferedImage. Now call paint() of the JPanel and pass it the graphics object.
Maybe you also have to pre-obtain the height/width of the JPanel for the size of the Image.

MouseMoved not working correctly applied to JPanel where image is displayed

Hi!!
I try to solve the problem by my own but resources available in internet would not help me.My wish is to create an application to image segmentation.
The main part of it is JPanel where JScrollpane is added. It is used to display image after calculations. I ude "BufferedImage" to keep image. An it works fine.
The problem is when i try to do this thing: when image is displayed and when cursor moves accros it, then the position (coordinates on image) of cursor will be printed.
I added mouselistener and MouseMotionListener and event "mouseMoved".
The effect is that i get only one pair of coordinates when cursor get first time into the image. When cursor will cross the border of image this will be the entry coordinates. But when i move cursor in imagearea there no changes od coordinates.
I use Netbeans 6.5 and JDK 6u10 and win2000.
Generaly i learned about java and image on this example:
http://wws2.uncc.edu/tpw/tpwJavaNtebeansTutorial/index.html
so when you can tell me how solve my problem on that example i would solve problem in my application.
thx

lipkerson
Welcome to the forum. Please don't post the same question multiple times.
I'm locking this thread. Any responses may please be posted in the Swing forum.
[http://forums.sun.com/thread.jspa?threadID=5349917]
db

JPanel to Image?

Hi,
I want to create a screenshot of the contents of a JPanel and then save it as a .gif or a .bmp.
I presume that it's doable but I've just spent a couple of hours rumaging about in the API and help docs and I'm still none the wiser. (Unfortunately graphics isn't one of my stronger areas).
Has anyone got any tips or code snippets that could help me?
Cheers
Paul

Hi Sylvian,
I tried your code, however, I got this error :
java.io.IOException : too many colors for a GIF.
This is the code that I am using :
public void printToFile() {
BufferedImage img = new BufferedImage(400,400,BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
// Paint the panel in this Graphics object
this.paint(g);
System.out.println("Done with painting");
try {
File file = new File("someFile.jpeg");
FileOutputStream out = new FileOutputStream(file);
new GifEncoder(img,out).encode();
System.out.println("Done with writing");
out.close();
} catch(Exception e) {
e.printStackTrace();
Thanks,
Vish.
Hi, you can do it like that
saveImage(myPanel, "c:/mypanel.gif");
public void saveImage(JPanel panel, String file)
BufferedImage image = new BufferedImage(100 , 100,
00, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
// Paint the panel in this Graphics object
panel.paint(g);
// Now encode the image using ACME free GIF
GIF encoder (www.acme.com)
FileOutputStream fos = new
new FileOutputStream(file);
GifEncoder encoder = new GifEncoder(image, fos);
encoder.encode();
fos.close();
// Done
}Sylvain

JPanel with image in it... truncated

Hi, for my app i have used multiple nested jpanels. But in one step of nesting, all the sudden my panels are truncated, i have the picture here. i have noticed that this is due to setLayout(null). When i comment this line in my panel, this works fine, but i need layout to be null because i need to put some more images in it..
http://img527.imageshack.us/img527/2156/picbf1.th.jpg
Please help

when your layout is set to null, then you are not using a layout manager, and you are fully responsible for making sure that all pictures and components are laid out correctly.
Putting multiple images on a panel are not a contraindication for using layout managers. Consider using layout managers here. Either that, or make sure you are setting up all your positions and sizes correctly.

Displaying image in JPanel and scroll it through JScrollpanel

Can any one will help me,
I need to draw a image in a JPanel and, this JPanel is attached with a Jscrollpanel.
I need to scroll the this JPanel to view the image.

Here is my code for that
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class PicPanel extends javax.swing.JPanel implements WindowListener{
/** Creates new form PicPanel */
public PicPanel() {
initComponents();
// this.setOpaque(true);
JFrame myFrame = new JFrame("Panel Tiler");
myFrame.addWindowListener( this );
myFrame.setSize(new Dimension(1000,300));
setPreferredSize(new Dimension(1000,300));
Container cp = myFrame.getContentPane();
cp.add( this, BorderLayout.CENTER );
tk = Toolkit.getDefaultToolkit();
im =tk.getImage("smple.jpg");
     jPanel1.im=im;
// jPanel1.setSize(new Dimension(1000,300));
myFrame.pack();
myFrame.show();
jPanel1.repaint();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
private void initComponents() {
java.awt.GridBagConstraints gridBagConstraints;
     jPanel1=new JPanelC();
jScrollPane1 = new javax.swing.JScrollPane(jPanel1);
setLayout(new java.awt.GridBagLayout());
jScrollPane1.setHorizontalScrollBarPolicy(javax.swing.JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
jScrollPane1.setVerticalScrollBarPolicy(javax.swing.JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane1.setOpaque(false);
     gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.gridwidth = 2;
gridBagConstraints.gridheight = 3;
gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
gridBagConstraints.ipadx = 378;
gridBagConstraints.ipady = 298;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.weighty = 1.0;
gridBagConstraints.insets = new java.awt.Insets(3, 3, 3, 3);
add(jScrollPane1, gridBagConstraints);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 1;
gridBagConstraints.ipadx = 372;
gridBagConstraints.ipady = 280;
gridBagConstraints.insets = new java.awt.Insets(3, 3, 3, 3);
add(jPanel1, gridBagConstraints);
public static void main(String[] args)
new PicPanel();
public void windowOpened(WindowEvent e) {}
public void windowClosing(WindowEvent e)
// myFrame.dispose();
System.exit(0);
public void windowClosed(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowActivated(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
private JPanelC jPanel1;
private javax.swing.JScrollPane jScrollPane1;
private Icon iiBackground;
private Toolkit tk;
private Image im;
class JPanelC extends javax.swing.JPanel{
public Image im;
public void paintComponent(Graphics g){
          //super.paintComponent(g);
if(im!=null)
               imageobserver io = new imageobserver();
     System.out.println(im.getHeight(io));
     if(im.getHeight(io)!=-1)
setSize(im.getWidth(io), im.getHeight(io));
g.drawImage(im,0,0,null);
     // setOpaque(false);
super.paintComponent(g);
class imageobserver implements java.awt.image.ImageObserver{
public boolean imageUpdate(Image img, int infoflags, int x, int y,int width, int height) {
          if ((infoflags & java.awt.image.ImageObserver.ALLBITS) != 0) {
repaint();
return false;
//repaint();
return true;
Here i need to scroll the image in the panel but it is not working out.

Having trouble displaying image in JPanel

I want to display an image in jpanel making it to scale to the size of the panel.
And later i should be able to draw on that image , i am really new to all this , but i have to finish it soon.
This is the code i am compiling and getting error
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class LocaterClient extends JFrame
     JPanel panel;
     public LocaterClient()
          super("LocaterClient");
          panel = new JPanel();
          panel.setSize(374,378);
          panel.setOpaque(false);
          panel.setVisible(true);
     getContentPane().add(panel);
     /*JFrame f = new JFrame();
     f.setSize(374,378);
     f.getContentPane().add(panel);*/
     public void paintComponent(Graphics g)
          super.paintComponent(g);
          ImageIcon img = new ImageIcon("World_MER.jpg");
          ImageIcon fillImage = new ImageIcon(img.getImage().getScaledInstance
(getWidth(), getHeight(),Image.SCALE_REPLICATE));
          g.drawImage(fillImage.getImage(), 0,0, this);
     public static void main(String args[])
          LocaterClient lc = new LocaterClient();
          lc.setDefaultCloseOperation( EXIT_ON_CLOSE );
          lc.pack();
          lc.setVisible(true);
This is the error i am getting
LocaterClient.java:24: cannot resolve symbol
symbol : method paintComponent (java.awt.Graphics)
location: class javax.swing.JFrame
super.paintComponent(g);
^
1 error
If i remove super.paintComponent(g); line it compiles and runs but i get a tiny panel without the image.
PLease help me , i am not evn sure is this is the procedure should i follow , because i should be able to draw on that image later on .
Please provide me with some sample code.

import javax.swing.*;
import java.awt.*;
public class ImagePainter extends JPanel{
private Image img;
public ImagePainter(){
    img = Toolkit.getDefaultToolkit().getImage("MyImage.gif");
public void paintComponent(Graphics g){
    g.drawImage(img,0,0,getSize().width,getSize().height);
public static void main(String[]args){
    JFrame frame = new JFrame();
    frame.getContentPane.add(new ImagePainter());
    frame.setSize(500,500);
    frame.show();

Trouble with background image in JPanel

I'm trying to get an image to display as a background image, and then put JLabels with other content on top of that background image. I've tried several things but can't figure out how to do it. Everytime I try, I get the images to display but the content is displayed side by side because of the layout manager.
I've tried this but the image is displayed very tiny and still is not displayed in the background.
   //*   Draw background images for panels            *
       public class BackgroundPanel extends JPanel
      // the image you want displayed in the background
         private Image background;
      // A constructor to build and initialise your panel.
      // @param resourceName
          public BackgroundPanel(String resourceName)
            background = new ImageIcon( getClass().getClassLoader().getResource( resourceName )).getImage();
            setOpaque(false);
      // @see java.awt.Container#paint(java.awt.Graphics)
          public void paint(Graphics g)
            g.drawImage(background, 0, 0, 200, 480, this);
         // draw the rest of the panel and it's children
              super.paint(g);
      }

To add a background to a Swing component, do not overload the public void paint(Graphics g); methods, but the public void paintComponent(Graphics g); instead, otherwise, the background will always overlap the Swing components added.
Here is a goog working code:
public void paintComponent(Graphics g) {
     super.paintComponent(g);
     g.drawImage(myStaticBackground, this.getWidth() - 256, this.getHeight() - 256, this);
}In this example, I draw a static Image sized 256�256 at the bottom right corner.
Fabruccio
Java J2SE 1.5

How to set an image as background for a jPanel in an applet

hi,
I want to set an image as background for a jPanel component in an applet. I am using netbeans environment. I found that to set an image as a background for a jPanel is not possible. Could someone help me .
Thanks in advance,
Joshua

public class ImagePanel extends JPanel
    private Image image = null;
    public void setImage(Image image)
        this.image = image;
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        g.drawImage(this.image, 0, 0, this);
}Adjust to taste.

JPanel as Image

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