Painting an image in a JComponent
I have a series of JComponents placed inside a JPanel. Each JComponent draws an Image class object. I have the following lines in my paintComponent method:
Image test_image = Toolkit.getDefaultToolkit().createImage("foo.gif");
try {
MediaTracker tracker = new MediaTracker(this);
tracker.addImage(test_image, 0);
tracker.waitForID(0);
catch ( Exception e ) {
g2.drawImage(test_image,0,0,this);
Here's the problem. My images are objects like spheres where every pixel is not filled inside the JComponent. Using Photoshop, I have created the images and specified that they have transparent backgrounds. However, when I paint them inside a JComponent, the backgound is not transparent, but white. I've used other images found elsewhere against the same code and the transparency property is respected. Is there some sort of policy in Java about what types of images can have transparent backgrounds and which one cannot?
hi guy:
Java allow "GIF" image with transparent background. You can use photoshop
to make a "GIF" image with transparent background and then paint it on the
Jcomponent. You will see the "GIF" image's backgound appears the Jcomponent's
foreground. That is very easy.
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Painting GIF images/using JLabels for GIFs... Somehow, make it work!
Ok, I am basically making an arena for a local multiplayer game for my friends, and across the top of the screen is a title ... lets call the title "Game Title". The entire game is contained in 1 JFrame, including the title, sidebars, and the actual "game" part in the middle. I paint all of the objects in the game by painting them in the JFrame's Graphics when the paint() method is called.
Basically, the window looks like this:
| /\./\./\./\./\....Game Title..../\./\./\./\./\ |
|...........______________..............|
|...........|.--.game area.--..|..............|
|...........|_____________|..............|
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| /\./\./\./\./\ .......................... /\./\./\./\./\ |
|.........................................................|
|.........................................................|
|.........................................................|
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Thanks for any help that you give!If you're going to paint use a graphic component to do your painting in and don't add any components to it. The 'paint' method in JFrame is called by swing to draw the JFrame and its components. Using it to do custom painting is tricky. You'll need to call 'super.paint' to allow the container to paint its children. See the method detail in the JFrame api (link is in the Container section of the api). Also check the 'paintComponent' and 'paint' methods in the JComponent api method details section.
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
public class Painting extends JPanel
BufferedImage image;
public Painting(BufferedImage image)
this.image = image;
protected void paintComponent(Graphics g)
super.paintComponent(g);
g.drawImage(image, 125, 175, this);
private JPanel getTitlePanel()
JLabel title = new JLabel("Game Title", JLabel.CENTER);
JLabel flame1 = new JLabel("flames");
JLabel flame2 = new JLabel("flames");
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.weightx = 1.0;
panel.add(flame1, gbc);
panel.add(title, gbc);
panel.add(flame2, gbc);
return panel;
public static void main(String[] args) throws IOException
String path = "images/Bird.gif";
BufferedImage bi = ImageIO.read(Painting.class.getResource(path));
Painting painting = new Painting(bi);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(painting.getTitlePanel(), "North");
f.getContentPane().add(painting);
f.setSize(400,400);
f.setLocation(200,200);
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} -
How do copy an image from a JComponent?
Hi,
i have a JComponent (in a swing based application) where I draw something on. Now Id like to copy an Image from the JComponent's painting area (no matter if the JComponent is shown or not). How do I get an image of the clipping region?
Is there something like myComponent.getImage(x,y,width,height)?
thanxNot sure what you are wanting but this might help you,you prob are going to need this for one
http://www.acme.com/java/software/Acme.JPM.Encoders.GifEncoder.html
Here is some code using the package from the link up above.The code below will get that image and copy it and save that image to a file
import java.awt.*;
import javax.swing.*;
import java.io.*;
import Acme.JPM.Encoders.GifEncoder;
class junk extends JFrame{
public junk() {
super();
setSize(400,400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
public void paint(Graphics g) {
Image im = createImage(200,200);
Graphics gg = im.getGraphics();
gg.fillRect(0,0,200,200);
g.drawImage(im,0,0,this);
pgetImage(im);
public void pgetImage(Image imm){
try{
File file = new File("Mypic.gif");
FileOutputStream out = new FileOutputStream(file);
GifEncoder cod = new GifEncoder(imm, out);
cod.encode();
out.close();
}catch(Exception oo){oo.printStackTrace();}
public static void main(String agrs[]) {
junk ji = new junk();
} good luck -
Methods to reduce the CPU Usage for painting the image
Hi,
I have developed an application to view images from an IP camera. By this I can simualtaneously view images from about 25 cameras. The problem is that the CPU Usage increases as the no of player increases. My Player is JPanel. which continuously paints the images from camera. The method 'paintImage' is called from another thread's run method. This thread is responsible for taking jpeg images from IP camera.
Here is the code for this.
public void paintImage(Image image, int fps) {
try {
int width = this.getWidth();
addToBuffer(image);
currentImage = image;
Graphics graphics = this.getGraphics();
if (isRunning && graphics != null) {
graphics.drawImage(image, 0, 0, getWidth(), getHeight(), this);
if(border ==true){
graphics.setColor(Color.RED);
graphics.drawRect(0,0,getWidth()-1, getHeight()-1);
graphics.setColor(Color.white);
graphics.setFont(new Font("verdana", Font.ITALIC, 12));
graphics.drawString("FPS : " + fps, width-60, 13);
this.fps = fps;
if (isRandomRecord) {
graphics.setColor(new Color(0, 255, 0));
graphics.fillArc((getWidth() - 10), 5, 10, 10, 0, 360);
} catch (Exception e) {
e.printStackTrace();
Can someone please help me to solve this problem so that the CPU usage can be reduced.Can you give me more detail information about how to use
an automated profiling tool You run it and excercise your app. Then it presents stats on number of times each method was called and time spent in each method, plus other stuff. Using those two stats you can zero in on the areas that are most likely to yield resullts. -
HELP, PLEASE!!!! I have to paint an image into...
Hello, anybody can help me?? I have to paint a map (gif image) into a panel and then paint points on this map. Every short period of time I have to change the points' position on the map. I am trying to put a transparent panel over the map and paint the points on the transparent panel. Has anybody a better idea??
You could do it all on the one Panel, if you want. Just extend a JPanel, create a BufferedImage of the gif file (Just once, in the constructor) and override the paint method of the JPanel, painting the image with the graphics object. After that, just use the GRpahics2D object to draw whatever you want, it will display over the image, and call repaint() every time you want the graphics updated.
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Hello all,
I have a basic understanding of Java Swing architecture and the Drawing capabilities of the Graphics and Graphics2D classes. However, i am utterly confused how to implement a basic tint over an image.
Overview:
I have a GCard (Graphical Card) class that extends JPanel. This class contains a BufferedImage so that when the GCard is added to a higher-level Container, it paints the BufferedImage. What I want to do is tint that card image to a user specified color (let's say RED) via the GCard.setTint(Color.RED) method and then allow them to control if the tint is on/off via the GCard.setTinted(true) method.
What I have:
Currently, I have the following in my GCard.paintComponent(Graphics g) method:
@Override
protected void paintComponent(Graphics g) {
int xPosition = 0;
int yPosition = 0;
if(image != null) {
g.drawImage(image, xPosition, yPosition, null);
if(isTinted() && tint != null) {
g.setColor(tint);
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for(int y = yPosition; y < (yPosition + image.getHeight()); y += 2)
g.drawLine(x, y, x, y);
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What I want:
What I'd like to see instead is a red haze over the entirety of the image. Much like the multiple item selection process that occurs when you select multiple things in a modern-day OS.
How can i do this?
From what I've read/thought out, I can either edit the actual image data to increase the level of the appropriate tint color, but I would prefer to be non-destructive to the image I'm holding in memory. I would prefer to imitate the 'layer' functionality of Adobe Photoshop where my image is the 'background' and I have a transparent panel that is tinted which can be switched on and off. Can I accomplish all of this in the paintComponent() method or will i need to add a JPanel (let's call it a tintPanel)to the GCard object and then add/remove that component from the GCard as necessary?
Thanks for the help!
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super.paintComponent(g);
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Hi,
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content = getContentPane();
content.setLayout(new BorderLayout());
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This works fine. However, this JFrame also contains a JToolbar with two buttons. Now when I click one of them, I want to replace the image with another one. I've tried removing it and creating a new ActiveImage to add that to content, but that didn't work very well. remove() resulted in a NullPointerException.
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Many thanks for any help,
Diederick de VriesB.T.W., this is the trace:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at ActiveImage.ActiveImageFrame$1.actionPerformed(ActiveImageFrame.java:60)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3093)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1766)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)Just before this, it says "button clicked". The function that calls the setImage() goes:
theButton.addActionListener (new ActionListener() {
public void actionPerformed(ActionEvent ae) {
System.out.println("button clicked");
activeImage.setImage(image);
});Reading the trace, I would think that the exception has something to do with this last code, since it stops there (line 60 is the setImage()). If the setImage() function itself was where the fault was, wouldn't the trace end there?
I'm really at a loss here ... :-( -
Hello
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Thanks in advance
Iris SpenninckHello
Now I have found how to put an image on a button, but I have yet another question.
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Anyone any idea how to accomplish that?
Thanks
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Need to read/paint large images fast. Help!
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Thanks,
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I've played a bit more, so let me update you. I am preloading images, the blocking queue (FIFO) is full when the animation begins. Right now, the queue capacity is 10, but for smaller images it can be closer to 40 or 50. The image reader queue reads images and places them in this queue. Oddly, the problem does not seem to be that the reader thread can't keep up. I added a print statement which displays the size of the queue before each removal and it remains very close to the capacity, at least for the my test images which are only 400 x 400, approximately 100 KB each.
I've tried animating the images in two distinct ways. My first approach, as I mentioned in the original question, was to animate the images using purely swing components and no manual painting of any kind. This is always nice because it frames the image perfectly and the code is minimal. To accomplish this I simply had the image reader thread pass in the image path to the constructor of ImageIcon and put the resulting ImageIcon in the queue. The animator thread had a simple swing timer which fired an ActionEvent every so-many milliseconds (in the event dispatch thread). In the actionPerformed method I simply wrote a few lines to remove the head of the queue and I used the JLabel setIcon(ImageIcon) to update the display. The code for this was very nice, however the animation was choppy (not flickering).
In my second approach, which was a bit longer, I created a class called AnimationPanel which extended JPanel and implemented Runnable. I simply overrode paintComponent and inside I painted a member Image which was set in the thread loop. Rather than storing ImageIcons, the queue stored Images. The reader thread used ImageIO.read(...) to generate an Image. I used simple logic in the thread loop to monitor the fps and to fire repaints. This approach suffered from the same problem as the one above. The animation was choppy.
I found the following things to be true:
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- I need to find a way to process the images fully before trying to paint them, but the I felt that my approaches above were doing that. I considered have the reader frame actually generate a JLabel or some object that can be displayed without additional processing.
- your idea about AWT components is a good one and I plan on trying that.
Elliot -
Howdi, I'd like to edit some WP pictures for wikipedia, essentially I want to replace some text with other text, much like MS Paint does it. Is there some software for me? Possibly for free?
as a matter of fact, it is not possible to change the text of a text with it. im relatively sure it isnt possible because the program is relatively simple, just as i wished, and ive read the description of all buttons in the edit window. The image I'm trying to edit is http://en.wikipedia.org/wiki/Image:Medical_legend.png . Paint would allow that, since I could copy background rectangles from around the place and supersede the old text with it bitwise. Then, I could insert new descriptions in their place. This feature of copying rectangles from an image and inserting them elsewhere is so powerful, yet so easy to learn, that I could ponder and speak ours over ours about the reasons, why imagewell doesnt have it, because a lot of work seems to have been put into it.
thanks for the try anyways, do you know yet another program? -
Hi,
I'm trying to get an Image of a JComponent. I have a JTextArea, but I want to perform a few special effects to it which require that it be converted to an Image.
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If you just wanted, say, a screen shot, then you could use the java.awt.Robot class which has a screen capture method. You'd need the bounds of the field translated to screen coordinates (I believe SwingUtilities or Toolkit has a method for that). Or you could create a BufferedImage object and get it's graphics object and call the component's paint method directly passing that graphics object to it. -
Images disappearing / being painted over
Hi,
Not especially familiar with images and am having issues with images being painted over when ever I move or adjust the size of my GUI. I built a majority of the GUI using the Form Designer included with Netbeans.
Would really appreciate any advice, happy to include more detail if required.
Cheers,
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GUIView
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Vector;
import javax.imageio.ImageIO;
* GUIView.java
* Created on 22 April 2007, 21:25
* The GUIView class is responsible to display a graphical interface.
* This class interacts with the user and the GUIControl class allowing the user to operate the system.
* @author Tim
public class GUIView extends JFrame implements ActionListener {
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private JTextField prodIDInput0;
private JLabel prodIDLabel0;
private JLabel prodIDLabel1;
private JLabel prodIDLabel2;
private JLabel prodNameLabel0;
private JLabel prodNameLabel1;
private JTextField amtRcvdInput0;
private JLabel amtRcvdLabel0;
private JButton cancelButton0;
private JMenu fileMenu0;
private JMenuItem exportXMLMenuItem;
private JMenuItem exitMenuItem;
private JButton findButton0;
private JLabel itemPrice0;
private JScrollPane jScrollPane1;
private JMenuBar menuBar0;
private JButton paymentButton0;
private JLabel prodDescLabel0;
private JLabel prodDescLabel1;
private JPanel prodImagePanel0;
private JPanel prodPanel0;
private JLabel qtyLabel0;
private JTextField qtyInput0;
private JLabel totalPrice0;
private JLabel totalPrice1;
private JList transList0;
private JPanel transPanel0;
private Vector listData;
private BufferedImage img;
private GUIControl guiCtl0;
/** Creates new form GUIView */
public GUIView (GUIControl guiCtl0) {
// reference guiCtl object
this.guiCtl0 = guiCtl0;
/** initilise gui object */
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// initialise the GUI
initComponents ();
// paint image
paintImage ("images/transparent.gif");
// show the GUI
setVisible (true);
/** 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 () {
// Instantiate GUI objects
prodIDLabel0 = new JLabel ();
prodIDLabel1 = new JLabel ();
prodNameLabel0 = new JLabel ();
prodNameLabel1 = new JLabel ();
prodDescLabel0 = new JLabel ();
prodDescLabel1 = new JLabel ();
prodImagePanel0 = new JPanel ();
itemPrice0 = new JLabel ();
totalPrice0 = new JLabel ();
totalPrice1 = new JLabel ();
prodPanel0 = new JPanel ();
prodIDLabel2 = new JLabel ();
prodIDInput0 = new JTextField ();
qtyInput0 = new JTextField ();
qtyLabel0 = new JLabel ();
findButton0 = new JButton ();
transPanel0 = new JPanel ();
paymentButton0 = new JButton ();
cancelButton0 = new JButton ();
amtRcvdInput0 = new JTextField ();
amtRcvdLabel0 = new JLabel ();
jScrollPane1 = new JScrollPane ();
transList0 = new JList ();
menuBar0 = new JMenuBar ();
fileMenu0 = new JMenu ();
listData = new Vector ();
// default close operation is to terminate the application
setDefaultCloseOperation (WindowConstants.EXIT_ON_CLOSE);
// title of the window
setTitle ("Supermarket Management System");
// centre the GUI on the screen
Rectangle rect = GraphicsEnvironment.getLocalGraphicsEnvironment ().getMaximumWindowBounds ();
rect.grow (-185,-100);
setBounds (rect);
// sets the minimum size the wonw can be shrunk to
setMinimumSize (new java.awt.Dimension (880, 480));
// sets the name of the frame
setName ("mainFrame");
// setup label to show Product ID:
prodIDLabel0.setFont (new java.awt.Font ("Tahoma", 1, 14));
prodIDLabel0.setText ("Product ID:");
// setup label to show the id of the latest product object
prodIDLabel1.setFont (new java.awt.Font ("Tahoma", 0, 14));
prodIDLabel1.setText ("");
prodIDLabel1.setToolTipText ("Product ID");
// setup label to show Name:
prodNameLabel0.setFont (new java.awt.Font ("Tahoma", 1, 14));
prodNameLabel0.setText ("Name:");
// setup label to show the name of the latest product object
prodNameLabel1.setFont (new java.awt.Font ("Tahoma", 0, 14));
prodNameLabel1.setText ("");
prodNameLabel1.setToolTipText ("Product Name");
// setup label to show Description:
prodDescLabel0.setFont (new java.awt.Font ("Tahoma", 1, 14));
prodDescLabel0.setText ("Description:");
// setup label to show the description of the latest product object
prodDescLabel1.setFont (new java.awt.Font ("Tahoma", 0, 14));
prodDescLabel1.setText ("");
prodDescLabel1.setToolTipText ("Product Description");
// align the prodDescLabel1 to TOP
prodDescLabel1.setVerticalAlignment (SwingConstants.TOP);
// setup panel to display image
prodImagePanel0.setBackground (new java.awt.Color (255, 255, 255));
prodImagePanel0.setBorder (javax.swing.BorderFactory.createEtchedBorder (javax.swing.border.EtchedBorder.RAISED));
org.jdesktop.layout.GroupLayout prodImagePanel0Layout = new org.jdesktop.layout.GroupLayout (prodImagePanel0);
prodImagePanel0.setLayout (prodImagePanel0Layout);
// specify how much the panel expands on the horizontal axis
prodImagePanel0Layout.setHorizontalGroup (
prodImagePanel0Layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (0, 304, Short.MAX_VALUE)
// specify how much the panel expands on the vertical axis
prodImagePanel0Layout.setVerticalGroup (
prodImagePanel0Layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (0, 255, Short.MAX_VALUE)
// setup item price label
itemPrice0.setFont (new java.awt.Font ("Tahoma", 1, 14));
itemPrice0.setText ("");
itemPrice0.setToolTipText ("Transaction Item Price information");
// setup label to display Total Price:
totalPrice0.setFont (new java.awt.Font ("Tahoma", 1, 18));
totalPrice0.setText ("Total Price:");
// setup label to display current transaction total price
totalPrice1.setFont (new java.awt.Font ("Tahoma", 0, 18));
totalPrice1.setText ("$0.00");
totalPrice1.setToolTipText ("Total cost of transaction");
// setup JPanel to contain product look up components
prodPanel0.setBorder (BorderFactory.createTitledBorder ("Enter Product"));
// setup label to display Product ID:
prodIDLabel2.setText ("Product ID:");
// setup label to display Quantity:
qtyLabel0.setText ("Quantity:");
// setup button and display FIND as the text
findButton0.setFont (new java.awt.Font ("Tahoma", 0, 14));
findButton0.setText ("FIND");
findButton0.setToolTipText ("Click to find product");
findButton0.addActionListener (this);
// create new GroupLayout for prodPanel0
org.jdesktop.layout.GroupLayout prodPanel0Layout = new org.jdesktop.layout.GroupLayout (prodPanel0);
prodPanel0.setLayout (prodPanel0Layout);
// set horizontal group
prodPanel0Layout.setHorizontalGroup (
prodPanel0Layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (prodPanel0Layout.createSequentialGroup ()
.add (15, 15, 15)
.add (prodIDLabel2)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
// add prodIDInput0 JTextField to form
.add (prodIDInput0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 126, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add (22, 22, 22)
.add (qtyLabel0)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
// addd qtyInput0 JTextField to form
.add (qtyInput0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 39, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add (22, 22, 22)
.add (findButton0)
.addContainerGap (org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
// set vertical group
prodPanel0Layout.setVerticalGroup (
prodPanel0Layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (prodPanel0Layout.createSequentialGroup ()
.addContainerGap ()
.add (prodPanel0Layout.createParallelGroup (org.jdesktop.layout.GroupLayout.BASELINE)
.add (prodIDLabel2)
// add prodIDInput0 JTextField to form
.add (prodIDInput0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add (qtyLabel0)
// add qtyInput0 JTextField to form
.add (qtyInput0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add (findButton0))
.addContainerGap (org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
// setup JPanel to contain finialise payment components
transPanel0.setBorder (BorderFactory.createTitledBorder ("Finalise Transaction"));
// setup button and display PAYMENT as the text
paymentButton0.setFont (new java.awt.Font ("Tahoma", 0, 14));
paymentButton0.setText ("PAYMENT");
paymentButton0.setToolTipText ("Click to finalise transaction");
// setup button and display CANCEL as the text
cancelButton0.setFont (new java.awt.Font ("Tahoma", 0, 14));
cancelButton0.setText ("CANCEL");
cancelButton0.setToolTipText ("Cancel the current transaction");
cancelButton0.addActionListener (this);
// setup label to display Amount received:
amtRcvdLabel0.setText ("Amount received:");
// create new GroupLayout for TransPanel0
org.jdesktop.layout.GroupLayout transPanel0Layout = new org.jdesktop.layout.GroupLayout (transPanel0);
transPanel0.setLayout (transPanel0Layout);
// set horizontal group
transPanel0Layout.setHorizontalGroup (
transPanel0Layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (org.jdesktop.layout.GroupLayout.TRAILING, transPanel0Layout.createSequentialGroup ()
.addContainerGap (org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add (amtRcvdLabel0)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
// add amtRcvdInput0 JTextField to form
.add (amtRcvdInput0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 58, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add (22, 22, 22)
.add (paymentButton0)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (cancelButton0)
.addContainerGap ())
// set vertical group
transPanel0Layout.setVerticalGroup (
transPanel0Layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (transPanel0Layout.createSequentialGroup ()
.addContainerGap ()
.add (transPanel0Layout.createParallelGroup (org.jdesktop.layout.GroupLayout.BASELINE)
.add (cancelButton0)
.add (paymentButton0)
// add amtRcvdInput0 JTextField to form
.add (amtRcvdInput0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add (amtRcvdLabel0))
.addContainerGap (org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
// setup JScrollPanel to display transaction items
transList0.setFont (new java.awt.Font ("Tahoma", 0, 14));
transList0.setListData (listData);
transList0.setToolTipText ("Items entered in the current transaction");
// specify scrollbars
jScrollPane1.setViewportView (transList0);
// setup the file menu
fileMenu0.setText ("File");
// add Export XML menu item to file menu
exportXMLMenuItem = new JMenuItem ("Export to XML");
exportXMLMenuItem.setToolTipText ("Export current product list to product.xml");
fileMenu0.add (exportXMLMenuItem);
// add menu seperator
fileMenu0.addSeparator ();
// add Exit menu item to file menu
exitMenuItem = new JMenuItem ("Exit");
exitMenuItem.setToolTipText ("Exit application");
fileMenu0.add (exitMenuItem);
// add the file menu to the menu bar
menuBar0.add (fileMenu0);
// set the menu bar to be menuBar0
setJMenuBar (menuBar0);
// layout remaining components onto JFrame
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout (getContentPane ());
getContentPane ().setLayout (layout);
// set horizontal group
layout.setHorizontalGroup (
layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (layout.createSequentialGroup ()
.addContainerGap ()
.add (layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (layout.createSequentialGroup ()
.add (prodIDLabel0)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (prodIDLabel1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 78, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (prodNameLabel0)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (prodNameLabel1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 164, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.add (layout.createSequentialGroup ()
.add (prodDescLabel0)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (prodDescLabel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 725, Short.MAX_VALUE))
.add (layout.createSequentialGroup ()
.add (prodImagePanel0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (jScrollPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 499, Short.MAX_VALUE))
.add (layout.createSequentialGroup ()
.add (itemPrice0)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED, 441, Short.MAX_VALUE)
.add (totalPrice0)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (totalPrice1))
.add (layout.createSequentialGroup ()
.add (prodPanel0, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (transPanel0, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addContainerGap ())
// set vertical group
layout.setVerticalGroup (
layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (layout.createSequentialGroup ()
.addContainerGap ()
.add (layout.createParallelGroup (org.jdesktop.layout.GroupLayout.BASELINE)
.add (prodIDLabel1)
.add (prodNameLabel1)
.add (prodNameLabel0)
.add (prodIDLabel0))
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (layout.createParallelGroup (org.jdesktop.layout.GroupLayout.BASELINE)
.add (prodDescLabel0)
.add (prodDescLabel1))
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (jScrollPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 259, Short.MAX_VALUE)
.add (prodImagePanel0, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (itemPrice0)
.add (layout.createParallelGroup (org.jdesktop.layout.GroupLayout.BASELINE)
.add (totalPrice1)
.add (totalPrice0)))
.addPreferredGap (org.jdesktop.layout.LayoutStyle.RELATED)
.add (layout.createParallelGroup (org.jdesktop.layout.GroupLayout.LEADING)
.add (prodPanel0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add (transPanel0, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.addContainerGap ())
// resize the frame to the minimum size needed to satisfy the preferred size of each of the components in the layout
pack ();
/** actionPerformed()
* handles events from components.
public void actionPerformed (ActionEvent e) {
if ( e.getSource () == findButton0 )
guiCtl0.findButtonAction (prodIDInput0.getText (), qtyInput0.getText ());
if ( e.getSource () == cancelButton0 )
guiCtl0.cancelButtonAction ();
/** showWelcomeMsg()
* Shows a welcome dialogue message to the user.
public void showWelcomeMsg (){
// Create a new dialogue box
JOptionPane welcomeMsg = new JOptionPane ();
// Show welcome dialogue box
welcomeMsg.showMessageDialog (null, "Welcome to the Supermarket Management System. Click OK to begin.", "Welcome", welcomeMsg.INFORMATION_MESSAGE);
/** showMsg()
* Shows a message to the user.
public void showErrorMsg (String s){
// Create a new dialogue box
JOptionPane errorMsg = new JOptionPane ();
// Show welcome dialogue box
errorMsg.showMessageDialog (null, s, "Message", errorMsg.ERROR_MESSAGE);
/** set prodIDInput0 text field */
public void setProdIDInput0 (String s){
prodIDInput0.setText (s);
/** set qtyInput0 text field */
public void setQtyInput0 (String s){
qtyInput0.setText (s);
/** set ProdDescLabel1 label */
public void setProdDescLabel1 (String s) {
prodDescLabel1.setText (s);
/** set prodIDLabel1 label */
public void setProdIDLabel1 (String s) {
prodIDLabel1.setText (s);
/** set prodNameLabel1 label */
public void setProdNameLabel1 (String s) {
prodNameLabel1.setText (s);
/** set totalPrice1 label */
public void setTotalPrice1 (String s) {
totalPrice1.setText (s);
/** populate transList0 with latest trans info */
public void setTransList0 (Vector v){
transList0.setListData (v);
/** set itemPrice0 label */
public void setItemPrice0 (String s) {
itemPrice0.setText (s);
/** draw prod images onto gui */
public void paintImage (String imagePath) {
// get Graphics
Graphics g = prodImagePanel0.getGraphics ();
// draw image into prodImagePanel0
img = null;
try {
img = ImageIO.read (new File (imagePath));
} catch (IOException e) {
System.err.println ("Caught IOException: "
+ e.getMessage ());
// draw the image on screen
g.drawImage (img, 2, 2, prodImagePanel0);
/** Change image */
public void updateImage (String imagePath){
// draw image into prodImagePanel0
img = null;
try {
img = ImageIO.read (new File (imagePath));
} catch (IOException e) {
System.err.println ("Caught IOException: "
+ e.getMessage ());
GUIControl
import javax.swing.*;
import java.text.*;
* GUIControl.java
* The GUIControl class is responsible to perform actions requested from the GUIView class.
* It also liaises with the TransControl and ProdControl objects to generate output to the
* gui and handle input from the gui.
* @author Tim
public class GUIControl {
// Declare object variables
private GUIView gui;
private ProdControl prodCtl0;
private TransControl transCtl0;
/** Creates a new instance of GUIControl */
public GUIControl (ProdControl prodCtl0, TransControl transCtl0) {
// make reference to prodCtl0, transCtl0 and gui objects
this.prodCtl0 = prodCtl0;
this.transCtl0 = transCtl0;
/** Set gui view object */
public void setGui (GUIView gui) {
this.gui = gui;
/** show the welcome dialouge */
public void showWelcome (){
// Call the showWelcomeMsg() method from gui to dispay welcome dialogue.
gui.showWelcomeMsg ();
/** find product */
public Product findProd (int prodId){
Product foundProd = prodCtl0.getProdByID (prodId);
return foundProd;
/** add product to transaction */
public String addProdToTrans (int prodId, double transQuantity){
// declare method variables
String status = "Product not added";
Product curProd0;
// find prodduct by ID
curProd0 = prodCtl0.getProdByID (prodId);
// 1. if product exists then add a new transaction item to the transaction list.
if (curProd0 != null) {
// 2. check quantity is a whole number for UPC Products
if (curProd0 instanceof UPCProd) {
// check if the result is a whole number
boolean isWhole = (Math.rint (transQuantity) == transQuantity);
// 3. if isWhole is false change status message.
if (isWhole == false) {
// return status as Product cannot be found.
status = "You must enter the quantity as a whole number for UPC products.";
return status;
} else {
// 4. check there is enough stock in the store
if (transQuantity > curProd0.getQuantity ()) {
// return status as there is not enough stock.
status = "There is currently not enough stock to fulfill this transaction. Please reduce the quantity." ;
return status;
} else {
} // end if 4.
} // end if 3.
} else {
} // end if 2.
// add curProd as new transItem
transCtl0.addTransItem (curProd0, transQuantity);
// return status as null to notify that the Product was added.
status = null;
return status;
} else {
// return status as Product cannot be found.
status = "Product " + prodId + " cannot be found.";
return status;
} // end if 1.
} // end addProdToTrans method
/** action Find button */
public void findButtonAction (String prodId0, String quantity0){
// status msg
String status;
// check prodId0 is not null
if (prodId0.equals ("")) {
// set status message to error and display error msg
status = "Please enter a valid Product ID.";
gui.showErrorMsg (status);
// check quantity0 is not null
} else if (quantity0.equals ("")) {
// set status message to error and display error msg
status = "Please enter a valid quantity.";
gui.showErrorMsg (status);
} else {
// parse String values into int and double
int prodId1 = Integer.parseInt (prodId0);
double quantity1 = Double.parseDouble (quantity0);
// reset prodIDInput0 and qtyInput0 text fields in the gui
gui.setProdIDInput0 ("");
gui.setQtyInput0 ("");
// add trans item and return result as a string
status = addProdToTrans (prodId1, quantity1);
if (status == null) {
updateProdTransView ();
} else {
// display msg to the user
gui.showErrorMsg (status);
} // end if
} // end if
} // end findButtonAction method
/** update product and transaction view on gui */
public void updateProdTransView (){
// get the last trans item added
TransItem lastTransItem0 = transCtl0.getLastTransItem ();
// find the product
Product p = findProd (lastTransItem0.getId ());
// update product info displayed in the gui
gui.setProdIDLabel1 (Integer.toString (p.getId ()));
gui.setProdNameLabel1 (p.getName ());
gui.setProdDescLabel1 (p.getDescription ());
// paint prod image
gui.paintImage (p.getImage ());
// update transaction info displayed in the gui
gui.setTransList0 (transCtl0.getTransItems ());
gui.setItemPrice0 (transCtl0.transItemPriceInfo (lastTransItem0));
// update total transaction cost displayed in the gui
gui.setTotalPrice1 ("$" + transCtl0.transTotal ());
} // end updateProdTransView method
/** action Cancel button */
public void cancelButtonAction (){
// cleat transaction items from transaction array list
transCtl0.clearTrans ();
// reset gui components
gui.setProdIDLabel1 ("");
gui.setProdNameLabel1 ("");
gui.setProdDescLabel1 ("");
gui.setTransList0 (transCtl0.getTransItems ());
gui.setItemPrice0 ("");
gui.setTotalPrice1 ("$0.00");
gui.paintImage ("images/transparent.gif");
}happy to include more detail if required.You've included too much detail.
If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program (SSCCE) that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
Don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the posted code retains its original formatting.
And don't post code generated by NetBeans. It uses the GroupLayout which is not a standard layout manager until JDK6 and a lot of people don't use JDK6 yet so we won't be able to execute you code to see whats happening.
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