Displaying images in jlabel, jpanel
Hi all,
below is my snippet:
public void actionPerformed(ActionEvent e)
lblImage.setIcon(new ImageIcon("c:/test"+cnt+".jpg";));
cnt++;
if(cnt==6)
cnt=1;
repaint();
}this actionPerformed() is executed for every 2 seconds. i am displaying continuously 5 pictures in a loop (c:/test1.jpg, c:/test2.jpg...). 5 images are displaying properly. But, they are not of newly updated jpg files. Files used for the 1st loop are used continuously irrespective of newly created files in c: (I am updating these 5 files in c: with another program, updation is proper.). how to show the files properly so that to get motion movie simulation.
please do help.
thanking you.
_________________________
Don't cross post or you won't get help in future. already answered on
[http://forums.sun.com/thread.jspa?threadID=5340639]
db
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System.out.println("d = " + d.toString());
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import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
public class ImageTest {
public static void main(String[] args) throws Exception {
// Grab some image...
File inFile = new File("resources/imageH.jpg");
int len = (int)inFile.length();
System.out.printf("file length = %d%n", len);
FileInputStream in = new FileInputStream(inFile);
// ... and create a byte array for testing
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int num = in.read(byteArray);
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The icon is: javax.swing.ImageIcon@5afd29Assuming your byte array is some (to ImageIO) recognisable image format, something
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Question about displaying image with JLabel
Hi
I need to display an image. The image is determined by the user at run time, so the dimension of the image is unknown. Is it possible for JLabel to stretch the image so the whole image(instead of only part of it) will always fits into a certain dimension?
thanks.For this you need to create a custom class that extends ImageIcon
and define the methods there.
see Java Tutorial for it.
For eg., to scale an image , you can use
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Displaying images on a JPanel from another thread
Hello all,
I'm trying to write my first multithreaded program. I have a program with 2 threads. The first (ie main) thread sets up a gui and performs some calculations, and the second thread changes the background of the gui at intervals. I been having a couple of problems with loading images in the second thread.
In my main thread, I initialise and make runnable the second thread, which is the thread that changes the gui background:
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The problem is when I try to load images and show them. I've never worked with images before, so I don't know what the best way of loading them onto a GUI is.
This is the code for the second thread:
package Graphics;
import java.awt.*;
import javax.swing.*;
import java.awt.Container.*;
import java.awt.Toolkit.*;
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Image bgImage1;
Image bgImage2;
Image bgImage3;
Image bgImage4;
Image bgImage5;
Image bgImage6;
Image bgImage7;
Image bgImage8;
Image bgImage9;
Image bgImage10;
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this.changeable = changeable;
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try
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bgImage5 = Toolkit.getDefaultToolkit().getImage("5");
bgImage6 = Toolkit.getDefaultToolkit().getImage("6");
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bgImage9 = Toolkit.getDefaultToolkit().getImage("9");
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Graphics/ThreadChangeBackground.java [57:1] cannot resolve symbol
symbol : method drawImage (java.lang.String,int,int,<nulltype>)
location: class java.awt.Graphics
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^
1 error
Errors compiling ThreadChangeBackground.If I change the code and try to do this: g.drawImage("bgImage" + imageNo, 400, 500, null); everything complies but the background of my gui does not change. Adding changeable.repaint() to the loadImage() method does not change the gui background.
I've got this far by reading the API (it's so big!), java textbooks and the java tutorial, but I really don't know what to do next.
Any help would really be appreciated!These are all the drawImage methods in Graphics class:
abstract boolean drawImage(Image img, int x, int y, Color bgcolor, ImageObserver observer)
Draws as much of the specified image as is currently available.
abstract boolean drawImage(Image img, int x, int y, ImageObserver observer)
Draws as much of the specified image as is currently available.
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Draws as much of the specified image as has already been scaled to fit inside the specified rectangle.
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Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface.
abstract boolean drawImage(Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1, int sx2, int sy2, ImageObserver observer)
Draws as much of the specified area of the specified image as is currently available, scaling it on the fly to fit inside the specified area of the destination drawable surface.
Notice that NONE of them takes String as the first argument.
Your error:
Cannot resolve symbol method drawImage (java.lang.String,int,int,<nulltype>)
suggests that java is looking for drawImage method that takes String as its first argument - IT'S NOT IN THE GRAPHICS CLASS - that's the problem
M
suggests -
Display image in JPanel without saving any file to disk
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Nico -
Problem displaying image in jpanel
Hi,I have posted this on the applet board, but I think its also a general programming problem, so apologies if it isn't relevant to this board, just say so and I'll remove it!
I've got an applet that receives a variable from a PHP page as a parameter. The variable is "map1.png" the map this variable refers to sits in the same folder as the applet.
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Cheers
Stevehi,
No, don't get any exceptions, the Java Console has a message:
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Cheers
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Hi,
I'm trying to work out the best method to display a set of thumbnail images in a JPanel (similar to a Thumbnail view in windows XP) - at the moment I'm using a Tree, but am wondering whether this is the best way to go about it? I'm using a tree in combination with a TreeModel but am having some problems as the cells don't expand to fit the picture size. Any ideas appreciated!!
thanks
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Problems displaying image in JPanel
Hi, I've got an applet that receives a variable from a PHP page as a parameter. The variable is "map1.png" the map this variable refers to sits in the same folder as the applet.
I want to use this variable along with getDocumentBase() to create a URL which will then be used to display an image within a jPanel called mapPane.
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// tell the MediaTracker to kep an eye on this image, and give it ID 1;
mt.addImage(map_png,1);
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// until the images are fully loaded.
try
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Cheers
SteveHello,
after an update of the graphics card driver to the newest just released version the problem has vanished.
Regards -
Simple and efficient way to display image on jpanel
AOA
What may be the simple and efficient way
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Open and display image in MVC layout
Hello!
I cant figure out how I shall do this in an MVC layout:
The program request user to open an image file that are then displayed in a JLabel
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I can not post the whole code fo you to run because it is to big, so I post the part that are the most important. please have a look.
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view.setImage_DisplayArea(model.pp);
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public void setImage_DisplayArea(PicturePanel pp) {
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Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.awt.Container.addImpl(Container.java:1015)You pressed new in file menu
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Hello2
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at Control_Inlupp2.actionPerformed(Control_Inlupp2.java:83)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.AbstractButton.doClick(AbstractButton.java:334)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1050)
at apple.laf.CUIAquaMenuItem.doClick(CUIAquaMenuItem.java:119)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1091)
at java.awt.Component.processMouseEvent(Component.java:5602)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3129)
at java.awt.Component.processEvent(Component.java:5367)
at java.awt.Container.processEvent(Container.java:2010)
at java.awt.Component.dispatchEventImpl(Component.java:4068)
at java.awt.Container.dispatchEventImpl(Container.java:2068)
at java.awt.Component.dispatchEvent(Component.java:3903)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3936)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866)
at java.awt.Container.dispatchEventImpl(Container.java:2054)
at java.awt.Window.dispatchEventImpl(Window.java:1801)
at java.awt.Component.dispatchEvent(Component.java:3903)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)Edited by: onslow77 on Dec 16, 2009 5:00 PM
Edited by: onslow77 on Dec 16, 2009 5:04 PMHello again!
Anyone that can help me figure out how to implement this in an MVC layout, I feel stuck.
I post a little program that open and display an image file so that you better can understand what I whant to do.
ShowImage
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import javax.swing.filechooser.*;
public class ShowImage extends JFrame{
//Variables
JFileChooser fc = new JFileChooser();
PicturePanel pp = null;
ShowImage () {
super("Show"); //Title
//Create the GUI
JPanel top = new JPanel();
add(top, BorderLayout.NORTH);
JButton openBtn = new JButton("Open");
top.add(openBtn);
openBtn.addActionListener(new Listner());
//Settings for the GUI
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setVisible(true);
class Listner implements ActionListener {
public void actionPerformed(ActionEvent ave) {
int answer = fc.showOpenDialog(ShowImage.this);
if (answer == JFileChooser.APPROVE_OPTION){
File f = fc.getSelectedFile();
//Check
System.out.println(f);
System.out.println(pp);
if (pp != null)
remove(pp); //Clean so that we can open another image
//Check
System.out.println(pp);
//Set the PicturePanel
pp = new PicturePanel(f.getAbsolutePath());
//Check
System.out.println(pp);
//Add PicturePanel to frame
add(pp, BorderLayout.CENTER);
validate();
pack();
repaint();
//Main
public static void main(String[] args) {
new ShowImage();
}PicturePanel
//Import Java library
import javax.swing.*;
import java.awt.*;
public class PicturePanel extends JPanel {
//Variables
private ImageIcon picture;
//Method to get information of the selected file
PicturePanel (String fileName) {
picture = new ImageIcon (fileName); //Get the filename
int w = picture.getIconWidth(); //Get the image with
int h = picture.getIconHeight(); //Get the image height
//Set preferable size for the image (Use the properties for the selected image)
setPreferredSize(new Dimension(w, h));
setMinimumSize(new Dimension(w, h));
setMaximumSize(new Dimension(w, h));
//Method to draw the selected image
protected void paintComponent(Graphics g) {
super.paintComponent(g); //We invoke super in order to: Paint the background, do custom painting.
g.drawImage(picture.getImage(), 0, 0, this); //Draw the image at its natural state
}//The endEdited by: onslow77 on Dec 16, 2009 7:30 PM
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