Multiple paint methods

Hi
I'm working on a draughts game and to make it a little nicer looking I've used graphics for the board squares.
My paint method is double buffered so when a peice is dragged it lags a little because it has to buffer so many images. The only images I need to buffer are the ones that move i.e. the draughts.
Is there a way to draw the squares in a separate paint method so they don't get buffered? Or is java limited to one paint method per class?

It's going to lag no matter how many paint methods you use. (Thats even if there ARE other paint methods) If it's lagging because of how many images must be drawn, then perhaps you should write an algorithm that repaints only the areas that have changed. ie: Only repaint wherever the single peice is moved.
-Adam

Similar Messages

Quesion about BasicToggleButtonUI's paint() method

hi,everybody,
I read the source code of BasicToggleButtonUI today and confused about it.
As what you see,a JToggleButton has two states.When you pressed the button,
the background color will changed.It remain the background unless you press the
button again.
However, I found that the paint() method and painticon() method are quite similar to
these of BasicButtonUI which is the super class of BasicToggleButtonUI.I could not found
the snippet to keep the background color. Can anybody who is mastered in this to tell me
why?
thx in advancd.

My question is, is there any way to ensure that a repaint() is completed before the program will move on?If you are not running multiple threads, then the answer is Yes...it already does. Chances are you are using the AWTEventQueue thread to do all of your work. When you click on a button, it creates an Event and puts it on the EventQueue. When repaint is called, an event is created and placed on the queue. Each event in the queue is processed by one thread, ONE AT A TIME, in the order that they were put into the queue.
If you have multi-threaded your application, you will have to learn more about how to handle multi-threading in GUI's. Typically synchronized(getTreeLock()) will help...sometimes.
If you don't know if you have multi-threaded or not....then you haven't done it.
Usually this type of issue is a coding error. If you post some code maybe someone else can spot the problem.

Adding a JButton when there's a paint method

I'm creating a game application, sort of like a maze, and I want to add buttons to the levelOne panel to be able to move around the maze. When I add the buttons to the panel they don't appear, I assume the paint method is the reason for this. here's my code, I have 3 files, ill post the user_interface, and the levels class, where the level is created and where i tried to add the button. I tried putting the buttons in a JOptionPane, but then my JMenu wouldn't work at the same time the OptionPane was opened. If anyone knows a way around this instead, please let me know. I also tried using a separate class with a paintComponent method in it, and then adding the button (saw on a forum, not sure if it was this one), but that didn't work either. Also, if there is a way just to simply have the user press the directional keys on the keyboard and have the program perform a certain function when certain keys are pressed, I'd like to know, as that would solve my whole problem. Thanks.
//Libraries
import java.awt.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.text.*;
public class User_Interface extends JFrame
static Levels l = new Levels ();
static Delay d = new Delay ();
private Container contentPane = getContentPane ();
private JPanel main, levelOne;
private String level;
private CardLayout cc = new CardLayout ();
private GridBagConstraints gbc = new GridBagConstraints ();
private JPanel c = new JPanel ();
private String label = "MainMenu";
public User_Interface ()
//Generates the User-Interface
super ("Trapped");
main = new JPanel ();
GridBagLayout gbl = new GridBagLayout ();
main.setLayout (gbl);
c.setLayout (cc);
// set_gbc (gbc, 2, 2, 5, 5, GridBagConstraints.NONE);
c.add (main, "Main Page");
contentPane.add (c, BorderLayout.CENTER);
cc.show (c, "Main Page");
levelOne = new JPanel ();
levelOne.setLayout (new GridBagLayout ());
levelOne.setBackground (Color.black);
c.add (levelOne, "LevelOne");
JMenuBar menu = new JMenuBar ();
JMenu file = new JMenu ("File");
JMenu help = new JMenu ("Help");
JMenuItem about = new JMenuItem ("About");
JMenuItem mainmenu = new JMenuItem ("Main Menu");
mainmenu.addActionListener (
new ActionListener ()
public void actionPerformed (ActionEvent event)
cc.show (c, "Main Page");
label = "MainMenu";
JMenuItem newGame = new JMenuItem ("New Game");
newGame.addActionListener (
new ActionListener ()
public void actionPerformed (ActionEvent event)
l.xCord = 2;
l.yCord = 2;
l.xLoc = 140;
l.yLoc = 140;
JPanel entrance = new JPanel ();
entrance.setLayout (new FlowLayout ());
c.add (entrance, "Entrance");
label = "Entrance";
level = "ONE";
cc.show (c, "Entrance");
JMenuItem loadgame = new JMenuItem ("Load Game");
JMenuItem savegame = new JMenuItem ("Save Game");
JMenuItem exit = new JMenuItem ("Exit");
exit.addActionListener (
new ActionListener ()
public void actionPerformed (ActionEvent event)
JFrame frame = new JFrame ();
frame.setLocation (10, 10);
JOptionPane.showMessageDialog (frame, "Come Back Soon!", "TRAPPED", JOptionPane.INFORMATION_MESSAGE);
System.exit (0);
file.add (about);
file.add (mainmenu);
file.add (newGame);
file.add (loadgame);
file.add (savegame);
file.add (exit);
menu.add (file);
menu.add (help);
setJMenuBar (menu);
//Sets the size of the container (columns by rows)
setSize (750, 550);
//Sets the location of the container
setLocation (10, 10);
//Sets the background colour to a dark blue colour
main.setBackground (Color.black);
//Makes the container visible
setVisible (true);
public void paint (Graphics g)
super.paint (g);
g.setColor (Color.white);
if (label == "MainMenu")
for (int x = 0 ; x <= 50 ; ++x)
g.setColor (Color.white);
g.setFont (new Font ("Arial", Font.BOLD, x));
g.drawString ("T R A P P E D", 100, 125);
d.delay (10);
if (x != 50)
g.setColor (Color.black);
g.drawString ("T R A P P E D", 100, 125);
if (label == "Entrance")
l.Entrance ("ONE", g);
label = "LevelOne";
if (label == "LevelOne")
l.LevelOne (g, levelOne, gbc);
label = "";
public static void main (String[] args)
// calls the program
User_Interface application = new User_Interface ();
application.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
} //End of Main Method
//Libraries
import java.awt.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
public class Levels extends Objects
private JFrame frame = new JFrame ();
//Sets location, size, and visiblity to the frame where the JOptionPane
//will be placed
frame.setLocation (600, 600);
frame.setSize (1, 1);
frame.setVisible (false);
public int xCord = 2;
public int yCord = 2;
public void LevelOne (Graphics g, JPanel one, GridBagConstraints gbc)
***Trying to add the button, doesn't appear. Tried adding to the container, and any JPanel i had created***
JButton button1 = new JButton ("TEST");
one.add (button1);
g.setColor (Color.white);
g.fillRect (500, 100, 200, 300);
g.setColor (Color.black);
g.drawRect (500, 100, 200, 300);
g.setFont (new Font ("Verdana", Font.BOLD, 25));
g.setColor (Color.black);
g.drawString ("LEVEL ONE", 525, 80);
//ROW ONE
counter = -80;
counter2 = 200;
for (int a = 1 ; a <= 7 ; ++a)
if (xCord < a && yCord == 0)
g.setColor (darkGray);
g.fillRect (xLoc + counter, yLoc - 80, 40, 40);
g.setColor (Color.black);
g.drawRect (xLoc + counter, yLoc - 80, 40, 40);
if (xCord > a - 1 && yCord == 0)
g.setColor (darkGray);
g.fillRect (xLoc + counter2, yLoc - 80, 40, 40);
g.setColor (Color.black);
g.drawRect (xLoc + counter2, yLoc - 80, 40, 40);
counter += 40;
counter2 += 40;
*****Theres 9 more rows, just edited out to save space****
int y = 100;
int x = 100;
for (int a = 0 ; a < 20 ; ++a)
g.setColor (Color.white);
g.fillRoundRect (x, y, 40, 40, 5, 5);
g.setColor (Color.black);
g.drawRoundRect (x, y, 40, 40, 5, 5);
y += 40;
if (a == 9)
x += 320;
y = 100;
x = 140;
y = 100;
for (int a = 0 ; a < 14 ; ++a)
g.setColor (Color.white);
g.fillRoundRect (x, y, 40, 40, 5, 5);
g.setColor (Color.black);
g.drawRoundRect (x, y, 40, 40, 5, 5);
x += 40;
if (a == 6)
x = 140;
y += 360;
g.setColor (Color.black);
g.drawRect (100, 100, 360, 400);
ImageIcon[] images = new ImageIcon [4];
images [0] = new ImageIcon ("arrow_left.gif");
images [1] = new ImageIcon ("arrow_up.gif");
images [2] = new ImageIcon ("arrow_down.gif");
images [3] = new ImageIcon ("arrow_right.gif");
int direction = -1;
*****This is where I tried to have the OptionPane show the directional buttons******
//frame.setVisible (true);
// direction = JOptionPane.showOptionDialog (frame, "Choose Your Path:", "Trapped", JOptionPane.YES_NO_CANCEL_OPTION,
// JOptionPane.QUESTION_MESSAGE,
// null,
// images,
// images [3]);
// if (direction == 0)
// if (xCord - 1 > 0)
// xCord -= 1;
// xLoc += 40;
// if (direction == 1)
// if (yCord - 1 > 0)
// yCord -= 1;
// yLoc += 40;
// if (direction == 2)
// if (yCord + 1 < 9)
// yCord += 1;
// yLoc -= 40;
// if (direction == 3)
// if (xCord + 1 < 13)
// xCord += 1;
// xLoc -= 40;
//LevelOne (g, one, gbc);
}

i tried adding a keylistener, that didn't work too well, i had tried to add it to a button and a textarea which i added to the 'one' frame, it didn't show up, and it didn't work. How would i go about changing the paint method so that it doesn't contain any logic? That's the only way I could think of getting the program to move forward in the game. Thanks.
//Libraries
import java.awt.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.text.*;
public class User_Interface extends JFrame
    static Levels l = new Levels ();
    static Delay d = new Delay ();
    private Container contentPane = getContentPane ();
    private JPanel main, levelOne;
    private String level;
    private CardLayout cc = new CardLayout ();
    private GridBagConstraints gbc = new GridBagConstraints ();
    private JPanel c = new JPanel ();
    private String label = "MainMenu";
    public User_Interface ()
        //Generates the User-Interface
        super ("Trapped");
        main = new JPanel ();
        GridBagLayout gbl = new GridBagLayout ();
        main.setLayout (gbl);
        c.setLayout (cc);
        // set_gbc (gbc, 2, 2, 5, 5, GridBagConstraints.NONE);
        c.add (main, "Main Page");
        contentPane.add (c, BorderLayout.CENTER);
        cc.show (c, "Main Page");
        levelOne = new JPanel ();
        levelOne.setLayout (new GridBagLayout ());
        levelOne.setBackground (Color.black);
        c.add (levelOne, "LevelOne");
        JMenuBar menu = new JMenuBar ();
        JMenu file = new JMenu ("File");
        JMenu help = new JMenu ("Help");
        JMenuItem about = new JMenuItem ("About");
        JMenuItem mainmenu = new JMenuItem ("Main Menu");
        mainmenu.addActionListener (
                new ActionListener ()
            public void actionPerformed (ActionEvent event)
                cc.show (c, "Main Page");
                label = "MainMenu";
        JMenuItem newGame = new JMenuItem ("New Game");
        newGame.addActionListener (
                new ActionListener ()
            public void actionPerformed (ActionEvent event)
                l.xCord = 2;
                l.yCord = 2;
                l.xLoc = 140;
                l.yLoc = 140;
                JPanel entrance = new JPanel ();
                entrance.setLayout (new FlowLayout ());
                c.add (entrance, "Entrance");
                label = "Entrance";
                level = "ONE";
                cc.show (c, "Entrance");
        JMenuItem loadgame = new JMenuItem ("Load Game");
        JMenuItem savegame = new JMenuItem ("Save Game");
        JMenuItem exit = new JMenuItem ("Exit");
        exit.addActionListener (
                new ActionListener ()
            public void actionPerformed (ActionEvent event)
                JFrame frame = new JFrame ();
                frame.setLocation (10, 10);
                JOptionPane.showMessageDialog (frame, "Come Back Soon!", "TRAPPED", JOptionPane.INFORMATION_MESSAGE);
                System.exit (0);
        file.add (about);
        file.add (mainmenu);
        file.add (newGame);
        file.add (loadgame);
        file.add (savegame);
        file.add (exit);
        menu.add (file);
        menu.add (help);
        setJMenuBar (menu);
        //Sets the size of the container (columns by rows)
        setSize (750, 550);
        //Sets the location of the container
        setLocation (10, 10);
        //Sets the background colour to a dark blue colour
        main.setBackground (Color.black);
        //Makes the container visible
        setVisible (true);
    public void paint (Graphics g)
        super.paint (g);
        g.setColor (Color.white);
        if (label == "MainMenu")
            for (int x = 0 ; x <= 50 ; ++x)
                g.setColor (Color.white);
                g.setFont (new Font ("Arial", Font.BOLD, x));
                g.drawString ("T    R    A    P    P    E    D", 100, 125);
                d.delay (10);
                if (x != 50)
                    g.setColor (Color.black);
                    g.drawString ("T    R    A    P    P    E    D", 100, 125);
        if (label == "Entrance")
            l.Entrance ("ONE", g);
            label = "LevelOne";
        if (label == "LevelOne")
            l.LevelOne (g, levelOne, gbc);
            label = "";
        //g.setColor (new Color
    public static void main (String[] args)
        // calls the program
        User_Interface application = new User_Interface ();
        application.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
    } //End of Main Method
//Libraries
import java.awt.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.ActionMap;
import javax.swing.plaf.*;
public class Levels extends Objects
    implements KeyListener
    //static final String newline = System.getProperty ("line.separator");
    JButton button;
    private JFrame frame = new JFrame ();
        //Sets location, size, and visiblity to the frame where the JOptionPane
        //will be placed
        frame.setLocation (600, 600);
        frame.setSize (1, 1);
        frame.setVisible (false);
    JButton button1;
    public int xCord = 2;
    public int yCord = 2;
    public void LevelOne (Graphics g, JPanel one, GridBagConstraints gbc)
    //    button = new JButton ("TEST");
    //    ButtonHandler handler = new ButtonHandler ();
     //   button.addActionListener (handler);
      // one.add (button);
        g.setColor (Color.white);
        g.fillRect (500, 100, 200, 300);
        g.setColor (Color.black);
        g.drawRect (500, 100, 200, 300);
        g.setFont (new Font ("Verdana", Font.BOLD, 25));
        g.setColor (Color.black);
        g.drawString ("LEVEL ONE", 525, 80);
        //ROW ONE
        counter = -80;
        counter2 = 200;
        for (int a = 1 ; a <= 7 ; ++a)
            if (xCord < a && yCord == 0)
                g.setColor (darkGray);
                g.fillRect (xLoc + counter, yLoc - 80, 40, 40);
                g.setColor (Color.black);
                g.drawRect (xLoc + counter, yLoc - 80, 40, 40);
            if (xCord > a - 1 && yCord == 0)
                g.setColor (darkGray);
                g.fillRect (xLoc + counter2, yLoc - 80, 40, 40);
                g.setColor (Color.black);
                g.drawRect (xLoc + counter2, yLoc - 80, 40, 40);
            counter += 40;
            counter2 += 40;
        int y = 100;
        int x = 100;
        for (int a = 0 ; a < 20 ; ++a)
            g.setColor (Color.white);
            g.fillRoundRect (x, y, 40, 40, 5, 5);
            g.setColor (Color.black);
            g.drawRoundRect (x, y, 40, 40, 5, 5);
            y += 40;
            if (a == 9)
                x += 320;
                y = 100;
        x = 140;
        y = 100;
        for (int a = 0 ; a < 14 ; ++a)
            g.setColor (Color.white);
            g.fillRoundRect (x, y, 40, 40, 5, 5);
            g.setColor (Color.black);
            g.drawRoundRect (x, y, 40, 40, 5, 5);
            x += 40;
            if (a == 6)
                x = 140;
                y += 360;
        g.setColor (Color.black);
        g.drawRect (100, 100, 360, 400);
        ImageIcon[] images = new ImageIcon [4];
        images [0] = new ImageIcon ("arrow_left.gif");
        images [1] = new ImageIcon ("arrow_up.gif");
        images [2] = new ImageIcon ("arrow_down.gif");
        images [3] = new ImageIcon ("arrow_right.gif");
        int direction = -1;
        //frame.setVisible (true);
        // direction = JOptionPane.showOptionDialog (frame, "Choose Your //\Path:", "Trapped", JOptionPane.YES_NO_CANCEL_OPTION,
        //         JOptionPane.QUESTION_MESSAGE,
        //         null,
        //         images,
        //         images [3]);
        // if (direction == 0)
        //     if (xCord - 1 > 0)
        //         xCord -= 1;
        //         xLoc += 40;
        // if (direction == 1)
        //     if (yCord - 1 > 0)
        //         yCord -= 1;
        //         yLoc += 40;
        // if (direction == 2)
        //     if (yCord + 1 < 9)
        //         yCord += 1;
        //         yLoc -= 40;
        // if (direction == 3)
        //     if (xCord + 1 < 13)
        //         xCord += 1;
        //         xLoc -= 40;
        one.addKeyListener (this);
        // one.add (button1);
        if (xCord == 1)
            LevelOne (g, one, gbc);
    /** Handle the key typed event from the text field. */
    public void keyTyped (KeyEvent e)
    /** Handle the key pressed event from the text field. */
    public void keyPressed (KeyEvent e)
        if (e.getSource () == "Up")
            JOptionPane.showMessageDialog (null, "Hi", "Hi", 0, null);
    /** Handle the key released event from the text field. */
    public void keyReleased (KeyEvent e)
        // displayInfo (e, "KEY RELEASED: ");
}

Paint() method in an entity class

Hi,
I am trying to draw 2 shapes in a Canvas, one rectangle and a circle.
However, I have an entity class for both the rectangle and the circle, something like:
public class MyRectangle
private int width, height;
public MyRectangle() { ... }
pulbic getWidth() { return width; }
pulbic getHeight() { return Height; }
I do not want to draw these 2 shape in the paint() method of the Canvas, I want my Rectangle class and my Circle to have their own paint method to draw themselves into the canvas, is it possible?
If it is possible, can you tell me roughly how to do it?
Do I have to extend the Component class?
Thanks in advance.
SK

Hi,
I tried to do what you mentioned as the following, but I cant get the circle display on the screen, do you know why? Thanks
public class Ball extends Component
private static final int diameter = 15;
private int xPosition = 10, yPosition = 10;
public Ball()
public int getX() { return xPosition; }
public int getY() { return yPosition; }
public int getDiameter() { return diameter; }
public void paint(Graphics g)
     super.paint(g);
Graphics2D graphics2D = (Graphics2D)g;
graphics2D.fillOval(xPosition, yPosition, diameter, diameter);
public class MyFrame extends JFrame
public MyFrame()
// Set up the main frame
super("Test");
setPreferredSize(new Dimension(400, 300));
Container contentPane = getContentPane();
     Ball aBall = new Ball();
     JPanel myPanel = new JPanel();
     myPanel.setBackground(Color.white);
     myPanel.setBorder(BorderFactory.createLineBorder(Color.black));
     myPanel.setOpaque(true);
myPanel.add(aBall);
     contentPane.add(myPanel, BorderLayout.CENTER);
pack();
/** The main method */
public static void main(String[] args)
     MyFrame myFrame = new MyFrame();
myFrame.setVisible(true);
}

Paint() method is in infinite loop when focus is set to JTextPane

Hi All,
I am creating one JScrollPane, JPanel and JTextPane. JPanel is added to JScrollPane and JTextPane is added to JPanel. If I override paint() method in JPanel, its in infinite loop. I don't know why it is behaving like this. Can anyone solve my problem. Since, I am doing so much drawings in paint() method, its getting to slow.
Here is the code what I wrote.
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class TestTextPane1 extends JFrame {
     JPanel panel;
     JScrollPane pane;
     public TestTextPane1() {
          panel = new JPanel(new BorderLayout()) {
               public void paint(Graphics g) {
                    super.paint(g);
                    System.out.println("inside paint");
          JTextPane textPane = new JTextPane();
          panel.add(textPane);
          pane = new JScrollPane(panel);
          getContentPane().add(pane);
          setSize(300, 200);
          setVisible(true);
     public static void main(String [] args) {
          new TestTextPane1();
Any help will be useful for me.
Regards
Kishore.

What are you trying to do? You are adding the textPane to the panel and then overriding the paint() method. The textPane will never be painted if you do this.
In Swing, you should override the paintComponent() method, not the paint() method. See the Swing tutorial on Painting:
http://java.sun.com/docs/books/tutorial/uiswing/overview/draw.html
Don't forget to read the "Working With Graphics" link at the bottom.

How to use an object's paint method

I have created a class imagePanel which extends a jPanel to display an image. When I create a new imagePanel object I pass it an image argument which is used to paint my image on the jPanel, so far so good. I don't wish to have to continuously create new ImamePanels to display new images so I thought I could make a set_Image method that would set a new image in an exising imagePanel object. This is where I run into problems how to use the existing object paint method to replace the image. I tried this without success:
public Image setMyImage (Image myImage)
imageX = myImage; // imageX is the image that is painted by the imagePanel object's paint method
paint(g);
Something must be wrong on how I access the paint method. Thanks for any help.
Jack

Yahoooo, got it. This was the code I needed and thanks for your help:
public void setImage (Image myImage)
imageX = myImage;
repaint(300);
}

Problem about calling paint method

I have created a class to ask user input 3 floating-point numbers, using JApplet. the code list below
import java.awt.Graphics;
import javax.swing.*;
public class Numbers
double average,sum,product;
String result;
public void init()
String firstNumber,secondNumber,thirdNumber;
double num1,num2,num3;
firstNumber=JOptionPane.showInputDialog("enter first number");
secondNumber=JOptionPane.showInputDialog("Enter second number");
thirdNumber=JOptionPane.showInputDialog("Enter thrid number");
num1=Double.parseDouble(firstNumber);
num2=Double.parseDouble(secondNumber);
num3=Double.parseDouble(thirdNumber);
sum=num1+num2+num3;
product=num1*num2*num3;
average=(num1+num2+num3)/3;
result="";
if(num1<num2 && num2<num3)
result=result+num3+" is the largest number";
if(num2>num1 && num2>num3)
result=result+num2 +" is the largest number";
if(num1>num2 && num2>num3)
result=result+ num1+" is the largest number";
public void paint(Graphics g)
super.paint(g);
g.drawString("sum is"+sum,25,25);
g.drawString("product is"+ product,25,40);
g.drawString("average is"+ average,25,60);
g.drawString(" the largest number is"+result,25,80);
however, after I compiled, it gave me the error message as:
java:40: cannot resolve symbol
symbol : method paint (java.awt.Graphics)
location: class java.lang.Object
super.paint(g);
^(pointer should point to the dot)
don't know why,
Message was edited by:
ritchie_lin

your class doesn't extend japplet or any other object for that matter. It does extend Object as all classes do, and Object has no paint method.
Consider changing:
public class Numbersto
public class Numbers extends JAppletAlso, please use code tags next time you're posting code.
Addendum: If this is not the JApplet portion of your code, it still has to subclass a Swing component that can accept painting such as JPanel. Also, with Swing you use paintComponent rather than paint.
Message was edited by:
petes1234

Problem in paint() method

i have defined a new class which extends JPanel. In that I have defined a paintComponent() method. i dont know how to use the repaint() method.
can anyone help?

i have defined a new class which extends JPanel. In
that I have defined a paintComponent() method. i dont
know how to use the repaint() method.I do not fully understand your problem, sorry. Could you please clarify a bit?
The repaint()-method is there to draw an image to the screen once again, to make changes visible. As far as I know, it calls the update()- and paint()-methods whenever you call it.

How to call paint() method during creating object

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
class SomeShape extends JPanel {
     protected static float width;
     protected BasicStroke line = new BasicStroke(width, BasicStroke.CAP_ROUND, BasicStroke.CAP_ROUND);
class Oval extends SomeShape {
     Oval(float width) {
          this.width = width;
          line = new BasicStroke(width, BasicStroke.CAP_ROUND, BasicStroke.CAP_ROUND);
          repaint();
     public void paint(Graphics g) {
          Graphics2D pen = (Graphics2D)g;
          int i = 10;
          super.paint(g);
               g.setColor(Color.blue);
               g.drawOval(90, 0+i, 90, 90);
               System.out.println("paint()");
public class FinalVersionFactory {
    JFrame f = new JFrame();
    Container cp = f.getContentPane();
    float width = 0;
    SomeShape getShape() {
         return new Oval(width++); //I want to paint this oval when I call getShape() method
     public FinalVersionFactory() {
          f.setSize(400, 400);
//          cp.add(new Oval()); without adding
          cp.addMouseListener(new MouseAdapter() {
               public void mouseReleased(MouseEvent e) {
                    getShape();
          f.setVisible(true);
     public static void main(String[] args) { new FinalVersionFactory(); }
}I need help. When I cliked on the JFrame nothing happened. I want to call paint() method and paint Oval when I create new Oval() object in getShape(). Can you correct my mistakes? I tried everything...Thank you.

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
class SomeShape extends JPanel {
     protected static float width;
     protected static BasicStroke line = new BasicStroke(width, BasicStroke.CAP_ROUND, BasicStroke.CAP_ROUND);
class Oval extends SomeShape {
     static int x, y;
     Oval(float width, int x, int y) {
          this.width = width;
          this.x = x;
          this.y = y;
          line = new BasicStroke(width, BasicStroke.CAP_ROUND, BasicStroke.CAP_ROUND);
     public void paint(Graphics g) {
          Graphics2D pen = (Graphics2D)g;
               g.setColor(Color.blue);
               pen.setStroke(line);
               g.drawOval(x, y, 90, 90);
               System.out.println("Oval.paint()"+"x="+x+"y="+y);
class Rect extends SomeShape {
     static int x, y;
     Rect(float width, int x, int y) {
          this.width = width;
          this.x = x;
          this.y = y;
          line = new BasicStroke(width, BasicStroke.CAP_ROUND, BasicStroke.CAP_ROUND);
     public void paint(Graphics g) {
          Graphics2D pen = (Graphics2D)g;
               g.setColor(new Color(250, 20, 200, 255));
               pen.setStroke(line);
               g.drawRect(x, y, 80, 80);
               System.out.println("Rect.paint()"+"x="+x+"y="+y);
public class FinalVersionFactory extends JFrame {
    Container cp = getContentPane();
    float width = 0;
    int x = 0;
    int y = 0;
        boolean rect = false;
    SomeShape getShape() {
         SomeShape s;
          if(rect) {
               s = new Rect(width, x, y);
               System.out.println("boolean="+rect);
          } else {
               s = new Oval(width++, x, y);
               System.out.println("boolean="+rect);
          System.out.println("!!!"+s); //print Oval or Rect OK
          return s; //return Oval or Rect OK
     public FinalVersionFactory() {
          setSize(400, 400);
          SomeShape shape = getShape();
          cp.add(shape); //First object which is add to Container(Oval or Rect), returned by getShape() method
          //will be paint all the time. Why? Whats wrong?
          cp.addMouseListener(new MouseAdapter() {
               public void mouseReleased(MouseEvent e) {
                    x = e.getX();
                    y = e.getY();
                    rect = !rect;
                    getShape();
                    cp.repaint(); //getShape() return Oval or Rect object
                                  //but repaint() woks only for object which was added(line 67) as first
          setVisible(true);
     public static void main(String[] args) { new FinalVersionFactory(); }
}I almost finish my program but I have last problem. I explained it in comment. Please look at it and correct my mistakes. I will be very greatful!!!
PS: Do you thing that this program is good example of adoption Factory Pattern?

Determining if printing is going on in paint method

By looking at the source of the existing visual components, I have found out that JComponent.paintChildren uses getFlag(IS_PRINTING) to determine wether or not the current call to paint will paint to screen or to a printer.
The problem is that both getFlag and the constants it uses are declared as private in JComponent. This is why I am wondering why Sun chose to keep this information private to the JComponent class, while this information could be very useful in some situations.
Also, would there be any alternatives to determine wether or not printing is occuring from a paint method besides managing flags the same way JComponent does?
Thanks in advance.

I gave a try to your approach but it doesn't seem that the graphics object passed to the paint method during the printing process implements PrintGraphics. I'll keep trying stuff with that idea until some new input is given, but thanks for the idea, it sure could have worked out ;)

Invoking paint method in Java3D

I have some example programs in using Java3D but none of them paints 'directly' on the canvas3D.
if i have a class that extends a Canvas3D how would i call the paint method, can i use this method to draw a 2D polygon on my canvas? (because i wanted to have 3D and 2D objects mixed).
how would i do this? are the points in terms of x, y, z?
can anyone help me with this?
thanks in advance

I've been trying to do this myself, snd it's a right pain in the arse.
To actually paint on the Canvas3D, when you override postRender(), you do all your stuff but it doesn't work until you call flush(). However, when I tied it (just drawing a simple rectange), my app slowed from 20fps to 2, which is a bit too much of a performance hit for my liking.
The J3D Repository overlay is fairly easy to set up, but for some reason the polygon it draws on is about 1 unit away from where you add it, so for a 1st person thing like I'm doing, it dissapears when you get too near a wall. In the end, i have just created my own by putting a texture on a cube just in front of the viewport.

How paint method in TiledLayer work ?

It's my 1st time in forum. Does anyone has source code of Sprite, TiledLayer class or know how exactly the paint method work? I had used it in some game but not satisfied with it. I want to code my own class but i wonder it has some native or low-level code.
Sorry for my poor E !!!

perhaps you want to use a more hardware oriented approach. I can highly recommend you the Slick API. It is built on top of the LWJGL API set, which is a Java binding for OpenGL, OpenAL and provides device support such as joysticks/joypads. Slick turns the 3D part into an easy to use 2D rendering framework.
[http://slick.cokeandcode.com/|http://slick.cokeandcode.com/]
Basic example program:
[http://slick.cokeandcode.com/wiki/doku.php?id=01_-_a_basic_slick_game|http://slick.cokeandcode.com/wiki/doku.php?id=01_-_a_basic_slick_game]

More than one paint method?

Hi
Im wondering if it is possible to have more than one paint method. It should look something like this.
public class MyApplet extends JApplet {
public void paint(Graphics g) { // the normal paint method
public void SecondPaint(Graphics gr) { // should i name the Graphics
// to the same as in the normal paint method ( Graphics g) ?
}And if its possible how would i repaint the other method?
This is for the normal
repaint(); and how would i do for the second paint method?
please write an example program with two paint methods and just write below how to repaint.
Thanks you som much if you reply

(sorry to hijack this thread...) Yes, it'swindows,
but right now my problem isn't even that. It'sjust
catching and correcting basic c-coding errors.
Witness my embarrassment in the JNI forum:
http://forum.java.sun.com/thread.jspa?threadID=5213196
&tstart=15
Now if only I lived in "middle-of-no-where"Virginia!
Nice! ;-)I saw your note about "middle-of-nowhere" Virginia a little too late. And you don't need to live here; my Solaris machine is up and running 24/7 and is open for SSH and XClient. (Also open for telnet, which comes built into windows, I believe.) If you'd like to brush up on Solaris C, C++ and Java development, just let me know. You're more than welcome to use the machine. I have tons of space on the drive and a dedicated connection just to that machine. There is an application for windows called CygwinX which is an XClient for Solaris. You can use that to remotely log into the Solaris desktop. There are about fifteen other people that I let use the machine for various reasons. I host myriad open source projects for development that you're more than welcome to mess around with. Tools available to you would be NetBeans 5.5, Sun Studio (with the Sun C/C++/Fortran compiler - which is beautiful by the way); and the whole suite of GNU compilers. I have the CDE and the JavaDesktop built in. I also have tons of Motif tutorials and demonstrations if you're interested in those. Heads up, though ... XServer tends to run pretty slowly when I have more than about four users logged onto a desktop at once. But like I said, if you (or just about anyone else for that matter) are interested, let me know and I'd be more than glad to set you up.

How to use paint method to draw in many componets.

Hi!
I have code like this:
public class MainPanel extends JPanel{
   JPanel p1;
   JPanel p2;
   public MainPanel(){
       super(new BorderLayout());
       p1 = new JPanel();
       p2 = new JPanel();
       add(p1 , BorderLayout.Center);
       add(p2 , BorderLayout. West);
       setVisible(true);
@Override
    protected void paintComponent(Graphics g) {
       g.setColor(Color.red);
       g.fillrect(10,10,10,10);
}This code is onle an example. Supose, this code will paint black rectangle on "main panel" to which p1 and p2 are added. What should i do to be able to paint this rectangle on p1 or p2 without creating separate classes in which i will override paintComponents() method for p1 and p2. I would like to avoid creating separete classes for each panels. Is there any way to do that using one paint Components method. Thanks in advance for all respone.

(where's Darryl when you need him?)Erm, Pete, since when did I become an expert lol?
Lost my hard disk, its been hiccuping for a couple of weeks now. I'm running on an old 20 GB PATA with a 5GB c drive. No IDE, no offline Javadoc. I'll get a HDD in the morning, but I hope I can spin up the old disk at least once and recover the last week's "work" ... just fun stuff actually.
Why does this code draw rectangles just for split second?repaint() (and consequently paint(), paintComponent() and other painting methods) may be called by the system any time it is detected that the component needs to be repainted. Since you do not have a override for paintComponent, it will perform its default painting and paint the entire component, wiping out your rectangle.
For persistent drawing on a JPanel or JComponent I know only one way: override paintComponent. If you need to avoid this, you could go with morgalr's suggestion to use JLabel.
For this you would draw the triangle/rectangle/whatever to a BufferedImage, then call label.setIcon with a new ImageIcon constructed from the BufferedImage.
Also, avoid obtaining a Graphics reference via getGraphics. During the lifetime of a visible component, various different Graphics references may be passed into the paintComponent method, so the reference you obtain may not be current. getGraphics can also return null.
luck, db

Passing Data to a Paint Method

Total newbie here just learning the basics of Java on my own. Working a little application that will display a filled polygon which shows the correct heading of ship based on previously input Ship Heading, length and width. I have the application working fine to generate the 5 points, and then it will display correctly when I enter the points in the paint method by hand. Thing is I want to have the coords passed to the paint method. and am having some trouble doing this. All the examples I have seen show the points to be displayed already being declared in the paint method. Here is the Paint Method I have come up with based on examples I have seen. Still pretty new and trying to read through the APIs and other books, but haven't broken the code on understanding them.
import java.awt.*;
import javax.swing.*;
public class DrawShip5
   public static void main(String[] a)
    JFrame f = new JFrame();
    f.setTitle("Ship Heading");
    f.setSize(700,700);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setContentPane(new DrawShip2());
    f.setVisible(true);
   static class DrawShip2 extends JComponent
       static public void paintData(int [] finalCoordsArray )
    int finalBowACoordX = finalCoordsArray[0];
    int finalBowACoordY = finalCoordsArray[1];
    int finalPortMidACoordX = finalCoordsArray[2];
    int finalPortMidACoordY = finalCoordsArray[3];
    int finalPortSternACoordX = finalCoordsArray[4];
    int finalPortSternACoordY = finalCoordsArray[5];
    int finalStarSternACoordX = finalCoordsArray[6];
    int finalStarSternACoordY = finalCoordsArray[7];
    int finalStarMidACoordX = finalCoordsArray[8];
    int finalStarMidACoordY = finalCoordsArray[9];
    public void paint(Graphics g )
         // Am sure my problem lies in here
        int finalBowACoordX = paintData.finalBowACoordX;
        int finalBowACoordY = paintData.finalBowACoordY;
        int finalPortMidACoordX = paintData.finalPortMidACoordX;
        int finalPortMidACoordY = paintData.finalPortMidACoordY;
        int finalPortSternACoordX = paintData.finalPortSternACoordX;
        int finalPortSternACoordY = paintData.finalPortSternACoordY;
        int finalStarSternACoordX = paintData.finalStarSternACoordX;
        int finalStarSternACoordY = paintData.finalStarSternACoordY;
        int finalStarMidACoordX = paintData.finalStarMidACoordX;
        int finalStarMidACoordY = paintData.finalStarMidACoordY;
         g.setColor(Color.black);
         g.drawLine(350, 0, 350, 700);
         g.drawLine(0, 350, 700, 350);
         g.setColor(Color.blue);
         Polygon shipPic = new Polygon();
         shipPic.addPoint( finalBowACoordX, finalBowACoordY ); // Bow Coords
         shipPic.addPoint( finalPortMidACoordX, finalPortMidACoordY ); // Port Midship Coords
         shipPic.addPoint( finalPortSternACoordX, finalPortSternACoordY ); // Port Aft Coords
         shipPic.addPoint( finalStarSternACoordX, finalStarSternACoordY ); // Starboard Aft Coords
         shipPic.addPoint( finalStarMidACoordX, finalStarMidACoordY ); // Starboard Midship Coords
         g.fillPolygon( shipPic );
} Thanks for any help

Looks like I was typing as Malcom was responding....where would I add that bit of code?
import java.awt.*;
import javax.swing.*;
public class DrawShip5
   public static void main(String[] a)
    JFrame f = new JFrame();
    f.setTitle("Ship Heading");
    f.setSize(700,700);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setContentPane(new DrawShip2());
    f.setVisible(true);
    // Place the code here? Get an error for the finalCoordsArray not recognized
   static class DrawShip2 extends JComponent
            private int finalBowACoordX;
         private int finalBowACoordY;
         private int finalPortMidACoordX;
         private int finalPortMidACoordY;
         private int finalPortSternACoordX;
         private int finalPortSternACoordY;
         private int finalStarSternACoordX;
         private int finalStarSternACoordY;
         private int finalStarMidACoordX;
         private int finalStarMidACoordY;
          static public void setCoords(int [] finalCoordsArray)
             int finalBowACoordX = finalCoordsArray[0];
             int finalBowACoordY = finalCoordsArray[1];
             int finalPortMidACoordX = finalCoordsArray[2];
             int finalPortMidACoordY = finalCoordsArray[3];
             int finalPortSternACoordX = finalCoordsArray[4];
             int finalPortSternACoordY = finalCoordsArray[5];
             int finalStarSternACoordX = finalCoordsArray[6];
             int finalStarSternACoordY = finalCoordsArray[7];
             int finalStarMidACoordX = finalCoordsArray[8];
             int finalStarMidACoordY = finalCoordsArray[9];
          // Print final coords after array passed and parsed
             System.out.println("Paint Final Bow Coords: (" + finalBowACoordX + ", " + finalBowACoordY + ")");
             System.out.println("Paint Final Port Midship Coords: (" + finalPortMidACoordX + ", " + finalPortMidACoordY + ")");
             System.out.println("Paint Final Port Stern Coords: (" + finalPortSternACoordX + ", " + finalPortSternACoordY + ")");
             System.out.println("Paint Final Starboard Stern Coords: (" + finalStarSternACoordX + ", " + finalStarSternACoordY + ")");
             System.out.println("Paint Final Starboard Midship Coords: (" + finalStarMidACoordX + ", " + finalStarMidACoordY + ")");
      public void paintComponent(Graphics g )
        g.setColor(Color.black);
         g.drawLine(350, 0, 350, 700);
         g.drawLine(0, 350, 700, 350);
         g.setColor(Color.blue);
         Polygon shipPic = new Polygon();
         shipPic.addPoint( finalBowACoordX, finalBowACoordY ); // Bow Coords
         shipPic.addPoint( finalPortMidACoordX, finalPortMidACoordY ); // Port Midship Coords
         shipPic.addPoint( finalPortSternACoordX, finalPortSternACoordY ); // Port Aft Coords
         shipPic.addPoint( finalStarSternACoordX, finalStarSternACoordY ); // Starboard Aft Coords
         shipPic.addPoint( finalStarMidACoordX, finalStarMidACoordY ); // Starboard Midship Coords
         g.fillPolygon( shipPic );
}Tried placing that code in a few spots and got errors.
Appreciate the help, These are my first attempts at actually getting away from a single method program. Am getting it ...slowly, but I am getting it.

Multiple paint methods

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