Problem with canvas

hiee
I am in the process of creating a GUI for an Application similar to the PaintBrush. On clicking the 'New' option of the menubar a JInternal frame opens.now ,i want to add on to it a canvas. how do i do that. i have written a code for it but the canvas is not gettin added onto the internalframe.
how do i add the canvas? please give suggestions.

public class DrawingPanel extends JPanel
public void paint(Graphics g)
// your code or other method calls
// Code to add JPanel
JInternalFrame frame = new JInternalFrame("Title");
frame.getContentPane().add(new DrawingPanel());

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Thanks,
Actually, this canvas overrides the JComponent class and is not an AWT Canvas component. A couple of things I did notice however....
Maybe overriding JPanel would be more suitable.
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Hi,
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Building "TestCanvas"
/home/ivan/j2mewtk/2.5.2/apps/TestCanvas/src/TestCanvas.java:16: cannot find symbol
symbol : method setMyvar(int)
location: class javax.microedition.lcdui.Displayable
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1 error
com.sun.kvem.ktools.ExecutionException
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You have calledd.setMyvar (1);d is an instance of Displayable, not TestCanvas and the method is a method of TestCanvas.
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Hello,
I have a problem with the canvas type ‘Horizontal Toolbar’ in Webforms 10g.
When I try to set or change the RGB value of a ‘Horizontal Toolbar’ with the forms function
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(at runtime) it has no effect in Webforms 10g for the canvas type ‘Horizontal Toolbar’ (the background color of the horizontal toolbar doesn’t change).
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Hello,
I'm having the exact same problem and I'd like to know what changes you made to your code to get it working. My class is not an inner class and is very much like yours and so follows the form:
class MyCanvas extends Canvas{
int element = getWidth()/10;
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g.setColor(0,0,0); //black
g.fillRect(0,0,getWidth(),getHeight());
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I'm trying to create a canvas that can be scrolled and is scalable through affine transformations. This, I'm trying to achieve by adding a control component to an existing Canvas that listens for MouseEvents and masks the area outside the area defined by the canvas when the control component is created. The base for this component was http://gasi.ch/blog/zooming-in-flash-flex/.
Next I'm explain how the component is supposed to work and then on to the problem.
This is how the canvas is created. In the constructor MouseListeners and a mask canvas is added to dragCanvas.
          var canvasControl:MatrixCanvasMouseControl = new MatrixCanvasMouseControl(dragCanvas);
The listeners work pretty much the same way as in the link I mentioned earlier. So on to the scaling which is the problem.
The scaling is done by first scaling the dragCanvas with method scaleAt(...):
/** START OF MOUSE WHEEL LISTENER */
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/** END OF MOUSE WHEEL LISTENER */
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This scales the maskCanvas also. Next I'm trying to scale the maskCanvas back to it's original position by:
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This might not be the best way to achieve scrolling. I also thought about extending Canvas and creating a parent Canvas that would contain dragCanvas and maskCanvas as it's children. That way scaling one would not affect the other. The problem with this was that I didn't find a way to do that without overriding Canvas functionality. If anyone knows and could explain how this could be done effectively for example by "decorating" it would be great.
I would really appreciate if anyone could help me with this. I've struggled with it for quite a few hours already.
I know I haven't explained everything clearly, so, please, ask me to clarify things more, if this was not understandable.
Message was edited by: Kimmo Jokinen
Message was edited by: Kimmo Jokinen

OK, I found a hacky solution to my problem by going through every rawChildren of the canvas and then scaling it if it's id didn't match with the one I created in the mouseControl component.
This does not seem like a very elegant way but at least it works.
I'm pretty sure that this should be done whole differently architecturally but I'm not experienced enough to find that way.
So this is how I did it.
for (i = 0; i < canvas.rawChildren.numChildren; i++) {
     child = canvas.rawChildren.getChildAt(i) as Object;
     if (!child is DisplayObject) {
          continue;
     transformAllowed = false;
     displayChild = DisplayObject(child);
     if (displayChild.hasOwnProperty("id") && (displayChild["id"] == "maskCanvas" || displayChild["id"] == "mouseControlArea")) {
          transformAllowed = false;
     } else {
          transformAllowed = true;
     if (transformAllowed) {
          MatrixHelper.scaleAt(displayChild, zoomOut, zoomOut, canvas.globalToLocal(eventStagePoint).x, canvas.globalToLocal(eventStagePoint).y);

Advance level drawing problem with Jframe and JPanel need optimize sol?

Dear Experts,
I m trying to create a GUI for puzzle game following some kind of "game GUI template", but i have problems in that,so i tried to implement that in various ways after looking on internet and discussions about drawing gui in swing, but i have problem with both of these, may be i m doing some silly mistake, which is still out of my consideration. please have a look at these two and recommend me one of them, which is running without problems (flickring and when you enlarge window the board draw copies (tiled) everywhere,
Note: i don't want to inherit jpanel or Jframe
here is my code : import java.awt.BorderLayout;
public class GameMain extends JFrame {
     private static final long serialVersionUID = 1L;
     public int mX, mY;
     int localpoints = 0;
     protected static JTextField[][] squares;
     protected JLabel statusLabel = new JLabel("jugno");
     Label lbl_score = new Label("score");
     Label lbl_scorelocal = new Label("local score");
     protected static TTTService remoteTTTBoard;
     // Define constants for the game
     static final int CANVAS_WIDTH = 800; // width and height of the game screen
     static final int CANVAS_HEIGHT = 600;
     static final int UPDATE_RATE = 4; // number of game update per second
     static State state; // current state of the game
     private int mState;
     // Handle for the custom drawing panel
     private GameCanvas canvas;
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     public GameMain() {
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          gameInit();
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          canvas.setPreferredSize(new Dimension(CANVAS_WIDTH, CANVAS_HEIGHT));
          this.setContentPane(canvas);
          this.setDefaultCloseOperation(EXIT_ON_CLOSE);
          this.pack();
          this.setTitle("MY GAME");
          this.setVisible(true);
     public void gameInit() {
     // Shutdown the game, clean up code that runs only once.
     public void gameShutdown() {
     // To start and re-start the game.
     public void gameStart() {
     private void gameLoop() {
     public void keyPressed(KeyEvent e) {
     public void keyTyped(KeyEvent e) {
     public void gameKeyReleased(KeyEvent e) {
          PuzzleBoard bd = getBoard();
          for (int row = 0; row < 4; ++row) {
               for (int col = 0; col < 4; ++col) {
                    if (e.getSource() == squares[row][col]) {
                         if (bd.isOpen(col, row)) {
                              lbl_score.setText("Highest Score = "
                                        + Integer.toString(bd.getPoints()));
                              setStatus1(bd);
                              pickSquare1(col, row, squares[row][col].getText()
                                        .charAt(0));
     protected void pickSquare1(int col, int row, char c) {
          try {
               remoteTTTBoard.pick(col, row, c);
          } catch (RemoteException e) {
               System.out.println("Exception: " + e.getMessage());
               e.printStackTrace();
               System.exit(1);
     // method "called" by remote object to update the state of the game
     public void updateBoard(PuzzleBoard new_board) throws RemoteException {
          String s1;
          for (int row = 0; row < 4; ++row) {
               for (int col = 0; col < 4; ++col) {
                    squares[row][col].setText(new_board.ownerStr(col, row));
          lbl_score.setText("Highest Score = "
                    + Integer.toString(new_board.getPoints()));
          setStatus1(new_board);
     protected void setStatus1(PuzzleBoard bd) {
          boolean locals = bd.getHave_winner();
          System.out.println("local win" + locals);
          if (locals == true) {
               localpoints++;
               System.out.println("in condition " + locals);
               lbl_scorelocal.setText("Your Score = " + localpoints);
          lbl_score
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     protected PuzzleBoard getBoard() {
          PuzzleBoard res = null;
          try {
               res = remoteTTTBoard.getState();
          } catch (RemoteException e) {
               System.out.println("Exception: " + e.getMessage());
               e.printStackTrace();
               System.exit(1);
          return res;
     /** Custom drawing panel (designed as an inner class). */
     class GameCanvas extends JPanel implements KeyListener {
          /** Custom drawing codes */
          @Override
          public void paintComponent(Graphics g) {
               // setOpaque(false);
               super.paintComponent(g);
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               // JPanel box = new JPanel();
               setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
               // add(statusLabel, BorderLayout.NORTH);
               // set up the x's and o's
               JPanel xs_and_os = new JPanel();
               xs_and_os.setLayout(new GridLayout(5, 5, 0, 0));
               squares = new JTextField[5][5];
               for (int row = 0; row < 5; ++row) {
                    for (int col = 0; col < 5; ++col) {
                         squares[row][col] = new JTextField(1);
                         squares[row][col].addKeyListener(this);
                         if ((row == 0 && col == 1) || (row == 2 && col == 3)
                         || (row == 1 && col == 4) || (row == 4 && col == 4)
                                   || (row == 4 && col == 0))
                              JPanel p = new JPanel(new BorderLayout());
                              JLabel label;
                              if (row == 0 && col == 1) {
                                   label = new JLabel("1");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              else if (row == 4 && col == 0) {// for two numbers or
                                   // two
                                   // blank box in on row
                                   label = new JLabel("2");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              else if (row == 1 && col == 4) {
                                   label = new JLabel("3");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              else if (row == 4) {
                                   label = new JLabel("4");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              else {
                                   label = new JLabel("5");
                                   label.setHorizontalAlignment(JLabel.LEFT);
                                   label.setVerticalAlignment(JLabel.TOP);
                              label.setOpaque(true);
                              label.setBackground(squares[row][col].getBackground());
                              label.setPreferredSize(new Dimension(label
                                        .getPreferredSize().width, squares[row][col]
                                        .getPreferredSize().height));
                              p.setBorder(squares[row][col].getBorder());
                              squares[row][col].setBorder(null);
                              p.add(label, BorderLayout.WEST);
                              p.add(squares[row][col], BorderLayout.CENTER);
                              xs_and_os.add(p);
                         } else if ((row == 2 && col == 1) || (row == 1 && col == 2)
                                   || (row == 3 && col == 3) || (row == 0 && col == 3)) {
                              xs_and_os.add(squares[row][col]);
                              // board[ row ][ col ].setEditable(false);
                              // board[ row ][ col ].setText("");
                              squares[row][col].setBackground(Color.RED);
                              squares[row][col].addKeyListener(this);
                         } else {
                              squares[row][col] = new JTextField(1);
                              // squares[row][col].addActionListener(this);
                              squares[row][col].addKeyListener(this);
                              xs_and_os.add(squares[row][col]);
               this.add(xs_and_os);
               this.add(statusLabel);
               this.add(lbl_score);
               this.add(lbl_scorelocal);
          public void keyPressed(KeyEvent e) {
          public void keyReleased(KeyEvent e) {
               gameKeyReleased(e);
          public void keyTyped(KeyEvent e) {
     // main
     public static void main(String[] args) {
          SwingUtilities.invokeLater(new Runnable() {
               @Override
               public void run() {
                    new GameMain();
thanks a lot for your time , consideration and efforts.
jibby
Edited by: jibbylala on Sep 20, 2010 6:06 PM

jibbylala wrote:
thanks for mentioning as i wasn't able to write complete context here.Yep thanks camickr. I think that Darryl's succinct reply applies here as well.

Design problem with JScrollPane

First, I have problems with english. I hope u understand without problems that Im trying to say here. Sorry about that.
Mi problem is whit a JScrollPane. I want to put an image whit a predefined size for draw inside it. I dont have any information about it, just the size. I want to put it in a JPane. The best choice is use the JPane area. The problem is that I want to use a JScrollPane because the image is bigger that the visualization area.
Im unable to put a Canvas in the ScrollPane, or a JPane whit a predefined size or an image whit a predefined size. Im sure that is a design problem. Somebody can tell me something I can start whit? What do u think is better choice to put inside a JScrollPane?
I dont send any source code because I dont have anything else that is show in the example.
Gracias.

import java.awt.*;
import javax.swing.*;
import java.net.URL;
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String url = "http://www.sandbox-usa.com/images/product_images/2piece_16.gif";
public Test() {
//    System.getProperties().put( "proxySet", "true" ); // uncomment if you have proxy
//    System.getProperties().put( "proxyHost", "myproxy.mydomain.com" ); // Your proxyname/IP
//    System.getProperties().put( "proxyPort", "80"); // Sometimes 8080
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    try {
      Image i = Toolkit.getDefaultToolkit().getImage(new URL(url));
      JLabel jl = new JLabel(new ImageIcon(i));
      content.add(new JScrollPane(jl), BorderLayout.CENTER);
      setSize(200, 200);
      setVisible(true);
    } catch (Exception e) { e.printStackTrace(); }
public static void main(String[] args) { new Test(); }
}

Problem with ScrollPane and JFrame Size

Hi,
The code is workin but after change the size of frame it works CORRECTLY.Please help me why this frame is small an scrollpane doesn't show at the beginning.
Here is the code:
import java.awt.*;
public class canvasExp extends Canvas
     private static final long serialVersionUID = 1L;
     ImageLoader map=new ImageLoader();
    Image img = map.GetImg();
    int h, w;               // the height and width of this canvas
     public void update(Graphics g)
        paint(g);
    public void paint(Graphics g)
            if(img != null)
                 h = getSize().height;
                 System.out.println("h:"+h);
                  w = getSize().width;
                  System.out.println("w:"+w);
                  g.drawRect(0,0, w-1, h-1);     // Draw border
              // System.out.println("Size= "+this.getSize());
                 g.drawImage(img, 0,0,this.getWidth(),this.getHeight(), this);
                int width = img.getWidth(this);
                //System.out.println("W: "+width);
                int height = img.getHeight(this);
                //System.out.println("H: "+height);
                if(width != -1 && width != getWidth())
                    setSize(width, getHeight());
                if(height != -1 && height != getHeight())
                    setSize(getWidth(), height);
}I create frame here...
import java.awt.*;
import java.awt.event.*;
import javax.swing.JFrame;
public class frame extends JFrame implements MouseMotionListener,MouseListener
     private static final long serialVersionUID = 1L;
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    private int dragStartX;
    private int dragStartY;
    private int lastX;
    private int lastY;
    int cordX;
    int cordY;
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        super("test");
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        canvas.addMouseMotionListener(this);
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        scrollPane.setEnabled(true);
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        add(scrollPane);
        setSize(300,300);
        pack();
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    public void mousePressed(MouseEvent e)
        dragStartX = e.getX();
        dragStartY = e.getY();
        lastX = getX();
        lastY = getY();
    public void mouseReleased(MouseEvent mouseevent)
    public void mouseClicked(MouseEvent e)
        cordX = e.getX();
        cordY = e.getY();
        System.out.println((new StringBuilder()).append(cordX).append(",").append(cordY).toString());
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    public void mouseExited(MouseEvent mouseevent)
    public void mouseMoved(MouseEvent mouseevent)
    public void mouseDragged(MouseEvent e)
        if(e.getX() != lastX || e.getY() != lastY)
            Point p = scrollPane.getScrollPosition();
            p.translate(dragStartX - e.getX(), dragStartY - e.getY());
            scrollPane.setScrollPosition(p);
}...and call here
public class main {
     public main(){}
     public static void main (String args[])
         frame f = new frame();
}There is something I couldn't see here.By the way ImageLoader is workin I get the image.
Thank you for your help,please answer me....

I'm not going to even attempt to resolve the problem posted. There are other problems with your code that should take priority.
-- class names by convention start with a capital letter.
-- don't use the name of a common class from the standard API for your custom class, not even with a difference of case. It'll come back to bite you.
-- don't mix awt and Swing components in the same GUI. Change your class that extends Canvas to extend JPanel instead, and override paintComponent(...) instead of paint(...).
-- launch your GUI on the EDT by wrapping it in a SwingUtilities.invokeLater or EventQueue.invokeLater.
-- calling setSize(...) followed by pack() is meaningless. Use one or the other.
-- That's not the correct way to display a component in a scroll pane.
Ah, well, and the problem is that when you call pack(), it retrieves the preferredSize of the components in the JFrame, and you haven't set a preferredSize for the scroll pane.
Please, for your own good, take a break from whatever it is you're working on and go through The Java™ Tutorials: [Creating a GUI with JFC/Swing|http://java.sun.com/docs/books/tutorial/uiswing/TOC.html]
db

Problem with repaint of display after a click event

Hi,
I have a problem with repaint of display. In particular in method keyPressed() i inserted a statement that, after i clicked bottom 2 of phone, must draw a string. But this string doesn't drawing.
Instead if i reduce to icon the window, which emulate my application, and then i enlarge it, i see display repainted with the string.
I don't know why.
Any suggestions?
Please help me.

modified your code little
don't draw in keyPressed
import java.io.IOException;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
public class PlayerCanvas extends Canvas implements CommandListener{
     Display display;
     Displayable dsp11;
private Image play, pause, stop, next, previous = null;
private int gamcode;
private Command quitCmd = new Command("Back", Command.ITEM, 1);
public PlayerCanvas(Display display,Displayable dsp11){
     this.display =display;
     this.dsp11 =dsp11;
     addCommand(quitCmd);
     createController();
     setCommandListener(this);
     display.setCurrent(this);
          protected void paint(Graphics g)
          g.setColor(255,200,150);
          g.fillRect(0, 0, getWidth(), getHeight());
          if (play != null){
          g.drawImage(play, getWidth()/5, getHeight()-50, Graphics.BOTTOM | Graphics.HCENTER);
          if (stop != null){
          g.drawImage(stop, getWidth()/5, getHeight()-10, Graphics.BOTTOM | Graphics.HCENTER);
          if (next != null){
          g.drawImage(next, (getWidth()/5)+10, getHeight()-30, Graphics.BOTTOM | Graphics.LEFT);
          if (previous != null){
          g.drawImage(previous, (getWidth()/5)-30, getHeight()-30, Graphics.BOTTOM | Graphics.LEFT);
               /////this will draw on key UP
               g.setColor(0,0,0);
               System.out.print(gamcode);
               if(gamcode==Canvas.UP){
                    g.drawString("PROVA",10, 0, 0);
               }else if(gamcode==Canvas.DOWN){
                    g.drawString("DIFFERENT",10, 30, 0);
private void createController()
try {
play = Image.createImage("/icon3.png");//replace your original images plz
pause = Image.createImage("/icon3.png");
stop = Image.createImage("/icon3.png");
next = Image.createImage("/icon3.png");
previous = Image.createImage("/icon3.png");
} catch (IOException e) {
play = null;
pause = null;
stop = null;
next = null;
previous = null;
if (play == null){
System.out.println("cannot load play.png");
if (pause == null){
System.out.println("cannot load pause.png");
if (stop == null){
System.out.println("cannot load stop.png");
if (next == null){
System.out.println("cannot load next.png");
if (previous == null){
System.out.println("cannot load previous.png");
          protected void keyPressed(int keyCode)
               repaint();
               if ( (keyCode == 2) || (UP == getGameAction(keyCode)) ){
                    gamcode = UP;
                    repaint();
                    else if ( (keyCode == 8) || (DOWN == getGameAction(keyCode)) ){
                         gamcode =DOWN;
                         repaint();
          else if ( (keyCode == 4) || (LEFT == getGameAction(keyCode)) ){
          else if ( (keyCode == 6) || (RIGHT == getGameAction(keyCode)) ){
          public void commandAction(Command arg0, Displayable arg1) {
               // TODO Auto-generated method stub
               if(arg0==quitCmd){
                    display.setCurrent(dsp11);
}

Problem with busy cursor

IHey there,
i have a popping up window in my Flex app. This window needs a little time to get created. In this time I want to set the Cursor to busy. But instead of the busy cursor Flex displays no cursor, also the arrow cursor disappears.
I tried the hack with callLater but it doesn't help. Had anyone a similar problem and knows how to fix it?
By the way: What is the best way to set the busy cursor? Static, with the parentApplication.cursoManager property or in the component with this.cursoManager? All of these ways have the same result on my problem: no cursor!
click on a item (own component, extended Canvas, buttonMode = true)
call function by MouseListener
function {
    this.cursorManager.setBusyCursor();
    this.callLater(doPopUpWork);
callLater function
doPopUpWork() {
    // DO WORK AND ADD POPUP
    this.cursorManager.removeBusyCursor;
I checked the right timing with trace statements [ trace("setBusy") ... ] and the also cursor comes Back when work is done and popup was added. All right and in right time. But the cursor disappears in that time instead of showing the busy cursor.
Can anybody help me???

I see there are problems with reading the code, try again:
click on a item (own component, extended Canvas, buttonMode = true)
call function by MouseListener
function {
    this.cursorManager.setBusyCursor();
    this.callLater(doPopUpWork);
callLater function
doPopUpWork {
    // DO WORK AND ADD POPUP
    this.cursoManager.removeBusyCursor();

Problem with canvas

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