Painting components on Canvas

I'm making a game that doesn't rely on layouts, containers, etc. Just a Canvas and a paint( Graphics ) override where the game is drawn. In the menu system for my game, I need a combo box. I don't want to implement one as it'd be kinda difficult, scrollbars on popup windows, etc. So, I would like to use the Swing version, JComboBox. Any suggestions on how?
I've tried
g.translate( tx, ty );
mCmbTime.paint( g );
g.translate( -tx, -ty );where mCmbTime is a JComboBox of course. Well, this displays a grey box to the Canvas. At least the box is visible, but the actual component does not seem to be drawn. BTW, before I do this i do:
setBounds( 0, 0, 75, 25 );
setVisible( true );Welp, any help would be appreciated.
Thanks

You post no code so we can't guess what you doing
wrong (at least I can't). Theres no trick involved.
You would simply do:It's more of a theoretical question than a "my program doesn't work" question. So it's hard to narrow it down to a segment of code.
JComboBox comboBox = new JComboBox(....);
comboBox.setBounds(....);
panel.add( comboBox );I don't want to add it, just use it.
Of course you have to make sure you don't paint over
top of it in your game.Exactly the question, how do I paint it on top and use it's features, drop down list, etc.
I'm not sure why you need to put the combobox in the
same container as the game. Why not just create aIt's in the menu system before the game actually starts. I want to use it in a custom form where I already have created my own lightweight radio buttons and checkboxes. I just don't want to have to create my own combo box, and I think the Swing version will look just fine.
panel with a border layout. Add the the combobox to
the North and add your game JPanel to the center.It's not a regular application. The point is I'm painting EVERYTHING! And now I just want to put a combo box in a particular place on a JPanel and have it work like normal. Is this possible? I would think so considering Swing is a lightweight gui set anyway and it works like this by design. I would like a response from someone that has done this before.
Thanks for the reply.

Similar Messages

Trying to do something very strange with layouts and painting components

I'm trying to do something very strange with changing the layout of a container, then painting it to a bufferedImage and changing it back again so nothing has changed. However, I am unable to get the image i want of this container in a new layout. Consider it a preview function of the different layouts. Anyway. I've tried everything i know about swing and have come up empty. There is probably a better way to do what i am trying to do, i just don't know how.
If someone could have a look perhaps and help me out i would be much appreciative.
Here is a self contained small demo of my conundrum.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.LineBorder;
// what is should do is when you click on the button "click me" it should place a image on the panel of the buttons in a
// horizontal fashion. Instead it shows the size that the image should be, but there is no image.
public class ChangeLayoutAndPaint
     private static JPanel panel;
     private static JLabel label;
     public static void main(String[] args)
          // the panel spread out vertically
          panel = new JPanel();
          panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
          // the buttons in the panel
          JButton b1, b2, b3;
          panel.add(b1 = new JButton("One"));
          panel.add(b2 = new JButton("Two"));
          panel.add(b3 = new JButton("Three"));
          b1.setEnabled(false);
          b2.setEnabled(false);
          b3.setEnabled(false);
          // the label with a border around it to show size in a temp panel with flowlayout to not stuff around
          // with the actual size we want.
          JPanel thingy = new JPanel();
          label = new JLabel();
          label.setBorder(new LineBorder(Color.black));
          thingy.add(label);
          // the button to make things go
          JButton button = new JButton("click me");
          button.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent e)
                    //change layout
                    panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
                    panel.doLayout();
                    //get image
                    BufferedImage image = new BufferedImage(panel.getPreferredSize().width, panel.getPreferredSize().height, BufferedImage.TYPE_INT_ARGB);
                    Graphics2D g = image.createGraphics();
                    panel.paintComponents(g);
                    g.dispose();
                    //set icon of jlabel
                    label.setIcon(new ImageIcon(image));
                    //change back
                    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
                    panel.doLayout();
          // the frame
          JFrame frame = new JFrame();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setSize(400,200);
          frame.setLocation(100,100);
          frame.getContentPane().add(panel, BorderLayout.NORTH);
          frame.getContentPane().add(thingy, BorderLayout.CENTER);
          frame.getContentPane().add(button, BorderLayout.SOUTH);
          frame.setVisible(true);
}

Looks like you didn't read the API for Container#doLayout().
Causes this container to lay out its components. Most programs should not call this method directly, but should invoke the validate method instead.
There's also a concurrency issue here in that the panel's components may be painted to the image before revalidation completes. And your GUI, like any Swing GUI, should be constructed and shown on the EDT.
Try this for size -- it could be better, but I've made the minimum possible changes in your code:import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;
public class ChangeLayoutAndPaint {
private static JPanel panel;
private static JLabel label;
public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        // the panel spread out vertically
        panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        // the buttons in the panel
        JButton b1, b2, b3;
        panel.add(b1 = new JButton("One"));
        panel.add(b2 = new JButton("Two"));
        panel.add(b3 = new JButton("Three"));
        b1.setEnabled(false);
        b2.setEnabled(false);
        b3.setEnabled(false);
        // the label with a border around it to show size in a temp panel with flowlayout to not stuff around
        // with the actual size we want.
        JPanel thingy = new JPanel();
        label = new JLabel();
        // label.setBorder(new LineBorder(Color.black));
        thingy.add(label);
        // the button to make things go
        JButton button = new JButton("click me");
        button.addActionListener(new ActionListener() {
          @Override
          public void actionPerformed(ActionEvent e) {
            //change layout
            panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
            //panel.doLayout();
            panel.revalidate();
            SwingUtilities.invokeLater(new Runnable() {
              @Override
              public void run() {
                //get image
                BufferedImage image = new BufferedImage(panel.getPreferredSize().width,
                    panel.getPreferredSize().height, BufferedImage.TYPE_INT_ARGB);
                Graphics2D g = image.createGraphics();
                panel.paintComponents(g);
                g.dispose();
                //set icon of jlabel
                label.setIcon(new ImageIcon(image));
                //change back
                panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
                //panel.doLayout();
                panel.revalidate();
        // the frame
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 200);
        frame.setLocation(100, 100);
        frame.getContentPane().add(panel, BorderLayout.NORTH);
        frame.getContentPane().add(thingy, BorderLayout.CENTER);
        frame.getContentPane().add(button, BorderLayout.SOUTH);
        frame.setVisible(true);
}db
edit I prefer this:import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.*;
public class LayoutAndPaint {
JPanel panel;
JLabel label;
public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        new LayoutAndPaint().makeUI();
public void makeUI() {
    JButton one = new JButton("One");
    JButton two = new JButton("Two");
    JButton three = new JButton("Three");
    one.setEnabled(false);
    two.setEnabled(false);
    three.setEnabled(false);
    panel = new JPanel();
    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
    panel.add(one);
    panel.add(two);
    panel.add(three);
    label = new JLabel();
    JButton button = new JButton("Click");
    button.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        layoutAndPaint();
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 400);
    frame.add(panel, BorderLayout.NORTH);
    frame.add(label, BorderLayout.CENTER);
    frame.add(button, BorderLayout.SOUTH);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
private void layoutAndPaint() {
    panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
    panel.revalidate();
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        BufferedImage image = new BufferedImage(panel.getPreferredSize().width,
            panel.getPreferredSize().height, BufferedImage.TYPE_INT_ARGB);
        Graphics g = image.createGraphics();
        panel.paintComponents(g);
        g.dispose();
        label.setIcon(new ImageIcon(image));
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
        panel.revalidate();
}db
Edited by: DarrylBurke

Paint bucket tool not painting color on canvas

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What's the chain of methods called for painting components?

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L

Well it seems that the paint method of the component is being called from sun.awt.RepaintArea.paint(...) which itself is being kicked off from handling an event that's been thrown.
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lister

right-click (or command-click) in the outer canvas, and watch for the pop-up menu options.

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From gameRender()
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Component[] comms=this.getComponents();
// Go round all
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System.out.println("Swing component name: "+comms.getName());
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I�ve managed to do something that seems to work now:
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Shankar.

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Hi,
the installer jar is a jar file that needs to be un-jarred, usually by double clicking the jar file. Once you (install) un-jar the
1) For example, if you download the latest solutions catalog from
https://blueprints.dev.java.net/servlets/ProjectDocumentList?folderID=4144&expandFolder=4144&folderID=0
you will download bpcatalog-ee5-ea-0.6-installer.jar
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hth,
Sean
Thank you for Reply.
hen i use
"bpcatalog-1.0.1_01-installer.jar" in
my projects lib folder its not working
an exception occurred
Jan 4, 2007 6:01:49 AM
org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw
exception
org.apache.jasper.JasperException: The absolute uri:
http://java.sun.com/blueprints/ui/14 cannot be
resolved in either web.xml or the jar files deployed
with this application
at
t
org.apache.jasper.compiler.DefaultErrorHandler.jspErro
r(DefaultErrorHandler.java:50)....
can you tell me what are all the java blueprint jar
file should be placed in my project....
Since bpcatalog-1.0.1_01-installer.jar is in
installation type...... plz tell me a step by step
process....

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Hi,
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--Ismail Degani
High Energy Synchrotron Source
Cornell University

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XvPutImage(display, info[0].base_id, window, gc, xv_image,
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}In this code bit, the crosshairs should move when the DataSource object changes member variables, line CrossX. But, the old crosshairs would not go away until the window was moved or resized. I'd get two crosshairs on the screen. I had to use a hack from the xwindows utility xrefresh everytime the crosshairs changed. It essentially simulated an x-window that opened over the Qt window, and then immediately closed. This worked well, but I thought I'd be free of that hack when I moved to java and JNI. Isn't this bizarre? Why would the window hold on to the old crosshair even when the varialbes change and there isn't any code that repaints it there after the video frame gets blitted?
hack adapted from xrefresh.c:
      if(newCrossHair)
                          Visual visual;
                  XSetWindowAttributes xswa;
                  Display *dpy;
                  unsigned long mask = 0;
                  int screen;
                  Window win;
                  if ((dpy = XOpenDisplay(NULL)) == NULL) {
                    fprintf (stderr, "unable to open display\n");
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                  screen = DefaultScreen (dpy);
                  xswa.background_pixmap = ParentRelative;
                  mask |= CWBackPixmap;
                  xswa.override_redirect = True;
                  xswa.backing_store = NotUseful;
                  xswa.save_under = False;
                  mask |= (CWOverrideRedirect | CWBackingStore | CWSaveUnder);
                  visual.visualid = CopyFromParent;
                  win = XCreateWindow(dpy, DefaultRootWindow(dpy), 400, 600, 1, 1,
                                      0, DefaultDepth(dpy, screen), InputOutput, &visual, mask, &xswa);
                  XMapWindow (dpy, win);
                  /* the following will free the color that we might have allocateded */
                  XCloseDisplay (dpy);
                  newCrossHair = false;
      } Any ideas? There's probably just some type of refresh call I need to use.
--Ismail

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Hi,
I would suggest you posting this in the Xcelsius forum.
Ingo

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I have a problem with painting in my canvas. I�m trying to do something like a Flash presentation.
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thx and sorry for my english

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                BufferedImage img = new BufferedImage(screenRect.width, screenRect.height, BufferedImage.TYPE_INT_ARGB);
                Graphics2D img_g = (Graphics2D)img.getGraphics();
                public void update(Graphics g){
                    paint (img_g);
                    g.drawImage(img, 0, 0, this);
                public void paint(Graphics g1){
                    Graphics2D g = (Graphics2D)g1;
                    g.drawImage(screenImage, 0, 0, null);
            scrFrame.setUndecorated(true);
            scrFrame.add(scrCanvas);
            scrCanvas.setBounds(screenRect);
            scrCanvas.setMinimumSize(screenRect.getSize());
            scrCanvas.setPreferredSize(screenRect.getSize());
            scrFrame.pack();
            scrFrame.setVisible(true);Then I paint something on the BufferedImage but nothing happens, nor when I call scrCanvas.repaint() or scrFrame.repaint(). It works only when I call scrCanvas.paint(scrCanvas.getGraphics()). But anyway, there has to be a way to do it without repainting, doesn't it? Can someone help me?
Thanks in advance
Ondřej

Don't mix AWT and Swing components. Change your Canvas to a JPanel.
To understand why this should not be done, see
{color:0000ff}http://java.sun.com/products/jfc/tsc/articles/mixing/index.html
http://java.sun.com/products/jfc/tsc/articles/painting/
{color}
db

Swing Filemenu below Canvas?

I am writing a simple program that displays an image encoded in a raw data format. I am new to graphics programming and I am sure that there are better ways to write what I have done, so if anyone has any suggestiois along those lines they would be appreciated.
My problem comes from my canvas being displayed on top of my menu bar, when file is clicked the menu cannot be seen. Is there some simple whay of fixing this or should I not even be using a canvas in the first place?
import java.awt.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
public class SwingingMenu extends JFrame {
     public static void main(String args[]) {
          JFrame f = new SwingingMenu();
          f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
f.pack();
f.setVisible(true);
     public SwingingMenu() {
          Menus menu = new Menus();
          Canvas rawImage = null;
          JPanel j = new JPanel();
          RawImageArray rawImageArray = new RawImageArray();
          Container contentPane = getContentPane();
          try{
               rawImage = new RawImage(128, 128, rawImageArray.generateArray("DB155S.in",128,128));
          catch(IOException e){e.printStackTrace();}
          setJMenuBar(menu);
          j.add(rawImage);
          contentPane.setBackground(Color.white);
          contentPane.setLayout(new BorderLayout());
          contentPane.add(j, BorderLayout.CENTER);
          setTitle("Raw Image Viewer");
class RawImageArray{
     private static int[][] rawImageArray = null;
     private static DataInputStream in = null;
     public static int[][] generateArray(String fileName, int height, int width)throws IOException{
          rawImageArray = new int[height][width];
          in = new DataInputStream(new FileInputStream(fileName));
          for(int r =0; r<128;r++){
               for(int c=0; c<128; c++){
                    rawImageArray[r][c] = in.readByte() & 0xff;
          in.close();
          return rawImageArray;
class Menus extends JMenuBar implements ActionListener{
     JMenuBar bar = null;
     JMenu menu = null;
     JMenuItem item = null;
     public Menus(){
          menu = new JMenu("File");
          item = new JMenuItem("Open");
          item.addActionListener(this);
          menu.add(item);
          item = new JMenuItem("Close");
          item.addActionListener(this);
          menu.add(item);
          bar = new JMenuBar();
          add(menu);
     public void actionPerformed(ActionEvent e)
          String actionCommand = e.getActionCommand();
          System.out.println(actionCommand);
class RawImage extends Canvas{
     int [][]rawImage = null;
     public RawImage(int height, int width, int[][] newRawImage){
          setSize(height,width);
          rawImage = newRawImage;
     public void paint(Graphics g){
          for(int r =0; r<128;r++){
                    for(int c=0; c<128; c++){
                         if(rawImage[r][c] == 255){
                         g.setColor(Color.black);
                         g.drawLine(c,r,c,r);
                         else if(rawImage[r][c] == 0){
                         g.setColor(Color.white);
                         g.drawLine(c,r,c,r);
}

As a general you should not mix AWT components with Swing components.
Canvas is an AWT component, try using a JPanel instead. Also, in Swing you should override the paintComponent() method not the paint() method.
If you click on the tutorial link on the left you will find a Swing tutorial that is worth reading (it can also be downloaded).

Painting components on Canvas

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