Sprite animation with double buffering

Hello, I am writing a game. I am not using swing. Just awt.
I have several books I am looking at right now. One uses the
BufferedImage class to create a buffered sprite. The other book instead uses the Image class to impliment double buffering. So, I am really confused now. I do not know if I should use the BufferedImage class or the Image class. Note that
Please help. Which method is the best to use?
Val

These links may assist you in full-screen animation with double-buffering:
http://www.sys-con.com/java/article.cfm?id=1893
http://www.meatfighter.com/meat.pdf
- Mike

Similar Messages

High CPU usage with double buffering enabled

Hello all,
My GUI application is using 100% of the CPU with double buffering (DB) enabled, about 20% with it disabled?
Also with DB enabled is visible slower than without, although there are some flickers.
Java 1.7.0_21
2 NVIDIA Quadro NVS 420
Windows 7
Any ideas?

Try tinkering with the Java2D system flags:
http://docs.oracle.com/javase/1.5.0/docs/guide/2d/flags.html

Problem with Double Buffering and Swing

Hi
I made a game and basically it works pretty well, my only problem is it flickers really badly right now. I read up on a whole lot of forums about double buffering and none of those methods seemed to work. Then I noticed that Swing has double buffering built in so I tried that but then I get compilation errors and I'm really not sure why. My original code was a console application and worked perfectly, then I ported it into a JApplet and it still works but it flickers and thats what I'm tryign to fix now.
The code below is in my main class under the constructor.
Heres the double buffering code I'm trying to use, I'm sure you all seen it before lol
public void update(Graphics g)
          // initialize buffer
          if (dbImage == null)
               dbImage = createImage(this.getSize().width, this.getSize().height);
               dbg = dbImage.getGraphics();
          // clear screen in background
          dbg.setColor(getBackground());
          dbg.fillRect(0, 0, this.getSize().width, this.getSize().height);
          // draw elements in background
          dbg.setColor(getForeground());
          paint(dbg);
          // draw image on the screen
          g.drawImage(dbImage, 0, 0, this);
     }My paint is right under neath and heres how it looks
This snipet of code works but when I change the method to
public paintComponent(Graphics g){
super.paintComponent(g)...
everythign stops working and get a compilation error and says that it can't find paintComponent in javax.swing.JFrame.
public void paint(Graphics g)
          super.paint(g);
          //if game starting display menue
          if (show_menue)
               //to restart lives if player dies
               lives = 3;
               menue.draw_menue(g);
               menue_ufo1.draw_shape(g);
               menue_ufo2.shape_color = Color.DARK_GRAY;
               menue_ufo2.draw_shape(g);
               menue_ufo3.shape_color = Color.BLUE;
               menue_ufo3.draw_shape(g);
               menue_ufo4.shape_color = new Color(82, 157, 22);
               menue_ufo4.draw_shape(g);
               menue_ufo5.draw_shape(g);
               menue_ufo6.shape_color = new Color(130, 3, 3); ;
               menue_ufo6.draw_shape(g);
               menue_turret.draw_ship(g);
               menue_ammo.draw_ammo(g);
          else
               //otherwise redraw game objects
               gunner.draw_ship(g);
               y_ammo.draw_ammo(g);
               grass.draw_bar(g);
               o_ufo.draw_shape(g);
               b_ufo.draw_shape(g);
               m_ufo.draw_shape(g);
               s_ufo.draw_shape(g);
               z_ufo.draw_shape(g);
               xx_ufo.draw_shape(g);
               info.draw_bar(g);
               live_painter.draw_lives(g, lives);
               score_painter.draw_score(g, score);
               level_display.draw_level(g, level);
               explosion.draw_boom(g);
     }I just want to get rid of the flickering for now so any help will be greatly appreciated. Depending which will be simpler I can either try to double buffer this program or port it all to swing but I'm not sure which elements are effected by AWT and which by Swing. Also I read some of the Java documentation but couldn't really understand how to implement it to fix my program.
Thanks in advance
Sebastian

This is a simple animation example quickly thrown together. I have two classes, an animation panel which is a JPanel subclass that overrides paintComponent and draws the animation, and a JApplet subclass that simply holds the animation panel in the applet's contentpane:
SimpleAnimationPanel.java
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JPanel;
import javax.swing.Timer;
class SimpleAnimationPanel extends JPanel
    private static final int DELAY = 20;
    public static final int X_TRANSLATION = 2;
    public static final int Y_TRANSLATION = 2;
    private Point point = new Point(5, 32);
    private BufferedImage duke = null;
    private Timer timer = new Timer(DELAY, new TimerAction());
    public SimpleAnimationPanel()
        try
            // borrow an image from sun.com
            duke = ImageIO.read(new URL(
                    "http://java.sun.com/products/plugin/images/duke.wave.med.gif"));
        catch (MalformedURLException e)
            e.printStackTrace();
        catch (IOException e)
            e.printStackTrace();
        setPreferredSize(new Dimension(600, 400));
        timer.start();
    // do our drawing here in the paintComponent override
    @Override
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        if (duke != null)
            g.drawImage(duke, point.x, point.y, this);
    private class TimerAction implements ActionListener
        @Override
        public void actionPerformed(ActionEvent e)
            int x = point.x;
            int y = point.y;
            Dimension size = SimpleAnimationPanel.this.getSize();
            if (x > size.width)
                x = 0;
            else
                x += X_TRANSLATION;
            if (y > size.height)
                y = 0;
            else
                y += Y_TRANSLATION;
            point.setLocation(new Point(x, y)); // update the point
            SimpleAnimationPanel.this.repaint();
}AnimationApplet.java
import java.lang.reflect.InvocationTargetException;
import javax.swing.JApplet;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class AnimationApplet extends JApplet
    public void init()
        try
            SwingUtilities.invokeAndWait(new Runnable()
                public void run()
                    // construct the panel
                    JPanel simpleAnimation = new SimpleAnimationPanel();
                    // put it in the contentPane of the JApplet
                    getContentPane().add(simpleAnimation);
                    setSize(simpleAnimation.getPreferredSize());
        catch (InterruptedException e)
            e.printStackTrace();
        catch (InvocationTargetException e)
            e.printStackTrace();
}Here's a 3rd bonus class that shows how to put the JPanel into a stand-alone program, a JFrame. It's very similar to doing it in the JApplet:
AnimationFrame.java
import javax.swing.JFrame;
public class AnimationFrame
    private static void createAndShowUI()
        JFrame frame = new JFrame("SimpleAnimationPanel");
        frame.getContentPane().add(new SimpleAnimationPanel());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    public static void main(String[] args)
        java.awt.EventQueue.invokeLater(new Runnable()
            public void run()
                createAndShowUI();
}Edited by: Encephalopathic on Mar 15, 2008 11:01 PM

C# implementation issue with double buffering

I am using the C# dll library to access the berkeley db, is there any way to pass the buffer, offset, count for the btree cursor move function. I dont want to double buffer to memory every time I conduct a cursor move.

Sir,
The call I am assuming you are using on the double buffered example is the DAQ_DB_TRANSFER. The output or return value on this is an integer array of i16's. I'm not very familiar with Borland C++ Builer 4, but I'm thinking the VCL label is just a control that you are trying to send a value to. I'm not sure why this would give you an violation, other than that array of integers not having an data in there, or you are pointing to the data in an element incorrectly.
Daniel McChane
Application Engineer
National Instruments

Need help with double buffering

Hi!
I'm trying to write an animated applet the shows the Java Duke waving.
No problem getting it to work, but the applet is flickering and I sence the need for double buffering.
I've tried to use "traditional" double buffering techniques without success. Something like this:
currentDuke = bufferGraphics.getGraphics();
public void update(Graphics g) {
    bufferGraphics.clearRect(0, 0, this.getWidth(), this.getHeight());
    paint(g);
public void paint(Graphics g) {
    bufferGraphics.drawImage(nextDuke, 0, 0, this);
    g.drawImage(currentDuke, 0, 0, this);
}Didn't help...
Here's my current code:
import javax.swing.*;
import java.awt.*;
* This is a simple animation applet showing Duke waving.
* @author Andrew
* @version 1.0 2002-07-04
public class WavingDuke extends JApplet implements Runnable {
    private Image[] duke;
    private Image currentDuke;
    private Thread wave;
     * Called by the browser or applet viewer to inform this applet that it has
     * been loaded into the system.
    public void init() {
        loadDuke();
        currentDuke = this.createImage(this.getWidth(), this.getHeight());
     * Called by the browser or applet viewer to inform this applet that it
     * should start its execution.
    public void start() {
        if (wave == null) {
            wave = new Thread(this);
            wave.start();
     * Loads all the duke images into a <code>Image</code> array.
    private void loadDuke() {
        duke = new Image[10];
        for (int i = 0; i < 10; i++) {
            duke[i] = this.getImage(this.getCodeBase(), "images/duke"+i+".gif");
     * Method cycles through different images and calls <code>repaint</code>
     * to make an animation. After each call to <code>repaint</code> the thread
     * sleeps for predefined amount of time.
    public void run() {
        while (true) {
            for (int i = 0; i < 10; i++) {
                currentDuke = duke;
repaint();
paus(150);
* Method makes the current thread to sleep for tha amount of time
* specified in parameter <code>ms</code>.
* @param ms The time to wait specified in milliseconds.
private void paus(int ms) {
try {
Thread.sleep(ms);
} catch (InterruptedException ie) {
System.err.println(ie.getMessage());
* Updates this component.
* @param g The specified context to use for updating.
public void update(Graphics g) {
paint(g);
* Paints this component.
* @param g The graphics context to use for painting.
public void paint(Graphics g) {
g.clearRect(0, 0, this.getWidth(), this.getHeight());
g.drawImage(currentDuke, 0, 0, this);
Thanks in advance!
/Andrew

I've solved it!
/Andrew

Drawing with double buffering to a JFrame

I want to create a simple JFrame and draw stuff to it via Graphic object using double buffering.
If I create a loop and draw constantly using JFrame.getGraphic().xxx, am i doing double buffering. ( 'cause i read somewhere that swing components automaticly use double buffering ). And is this the righ approuch ( or whatever it's spelled ) ?

I want to create a simple JFrame and draw stuff to it
Don't do that.
If you want to do custom rendering then use JPanel or JComponent, not JFrame.
If I create a loop and draw constantly using JFrame.getGraphic().xxx, am i doing double buffering.
No.
You're also painting outside the standard paint cycle, which is a Bad Idea.
So, essentially, everything your suggesting is the wrong way to go about things.
In its most simple form, double buffering works something like this, though there are a whole load of subtleties to consider (such as component resizing for a start)
public class Foo extends JComponent
    private BufferedImage image = null;
    protected void paintComponent(Graphics g)
        if (image != null)
            image = createImage(getWidth(), getHeight());
            paintBuffer(ig);
        g.drawImage(image, 0, 0, this);
    private void paintBuffer()
        Graphics ig = image.getGraphics();
        // do the rendering
        ig.dispose();
}

Force repaint with Double-buffering

i've been using the "classic" DB class you can find everywhere on the net (just extend a component - JPanel in my case - keep an image and draw the image to component on repaint ) the class works well however when the code execution is intense the repaint manager doesnt have time to draw the image to the screen- i've tried playing to the repaintManger but in fact it seems like i can control very little of it. Is there a way to force repainting to screen? thanks

If "the code execution is intense", then the code should be running in a separate thread so that it doesn't block up the painting.

Double Buffering in Java Swing

Hi sir,
Here i want to know about what is exactly double buffering?
I have learned that double buffering is automatic in swing components.
But i have some problem with my JButtons it is FLICKERING a bit.Where u need to scroll the mouse to see it.Can be provide any idea for this.
And also give some sample examples related to double buffering.
Thanx,
m.ananthu

Hi sir,
I have a problem with repainting and validate methods.
In my project when i click a startbutton it will show a row of 4 buttons and when i click it again that 4 buttons should disappear.All this features are working well.But when i again click the startbutton
the 4 buttons are not showing in the second time but when i use the
mouse and scroll over 4 buttons area it is showing the 4 buttons.
I have used repaint() and validate() methods still there is no use.
so Pls. do help me.Is it any thing to do with double buffering ?It is
Urgent.Here is my problem code:-
Here is the code where MenuOptionList is a class that contains 4 buttons I have used the instance of the MenuoptionList here.Here when i click the "Start" which is for the start button Menuoptionlist will show which contains the row of 4 buttons as u can see there i have used a Flag=false for the first click (ie) to show the row of 4 buttons and in the next i have set the Flag=true to make the 4 buttons disappear all this features are working fine where jp.add(mol) means "jp" is a panel which is set it in the beginning of my home page with setBounds in to it i am adding the mol(instance of MenuoptionList).Here the problem is when i click the StartButton the 4 button are displaying & when i click it next time they are disappearing that all works fine.But when i click it for the next the 4 buttons should show.The problwem is they are showing but they are invisible in such a case if scroll the mouse over the 4 buttons area they are visible.What is the problem here.I have used repaint(),validate() methods still no use.Is the problem is to do with any instance removal.Pls.do help me.It is Urgent
public void actionPerformed(ActionEvent e)
changeCenterPanel(e.getActionCommand());
private void changeCenterPanel(String buttonEvent){
if((buttonEvent.equals("Start"))&&(Flag==false)){
mol=new MenuOptionList(jp,jp1,jp2);//Which contains the 4 buttons
mol.setBounds(150,1,500,600);
Color c1=new Color(116,121,184);
mol.setBackground(c1);
mol.validate();
mol.repaint();
jp.add(mol);
jp.validate();
jp.repaint();
Flag=true;
else if((buttonEvent.equals("Start"))&&(Flag==true))
mol.removeAll();//removing the 4 buttons
mol.validate();
mol.repaint();
Flag=false;
Thanx,
m.ananthu

Dragging a drawing when double-buffering

Hopefully someone out there can help me with this...
To state the situation simply, I have an applet in which I need to select, drag, and drop in order to move them around. The applet works fine right now, but I can't figure out how to add dragging. The way I have it, you click the object, drag the mouse to where you want to move it, and let go. It then dissapears from where it was, and appears where it was placed. The prolem is that I want to actively see the object being dragged....even an outline would work. As it is, it's difficult to know what you were selecting to move.
I added a mouseDragged() function to the program, but I see no evidence of it working, which I think has something to do with the double-buffering I used. As far as I can tell, it does draw the object being dragged, it just doesn't ever show up on the screen....
I would appreciate any input anyone can offer!

With double buffering
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.awt.image.BufferedImage;
public class Omove extends Frame
     BufferedImage img;
     Graphics      mg;
     Vector v = new Vector();
     Mobject m;
     int    iv = -1;
     int    dx = -1;
     int    dy = -1;
public Omove()
     addWindowListener(new WindowAdapter()
    {     public void windowClosing(WindowEvent ev)
          {     dispose();
               System.exit(0);}});
     setBounds(10,10,400,300);
     v.add(new Mobject(1,30,30));
     v.add(new Mobject(1,89,120));
     v.add(new Mobject(2,130,230));
     v.add(new Mobject(3,210,60));
     addMouseListener(new MouseAdapter()
     {     public void mouseReleased(MouseEvent m)
               if (iv != -1) putTheObject(m.getX(),m.getY());
     addMouseMotionListener(new MouseMotionAdapter()
          {     public void mouseDragged(MouseEvent m)
                    if (dx == -1) findTheObject(m.getX(),m.getY());
                    if (iv != -1)
                         dx = m.getX();
                         dy = m.getY();
                         repaint();
     setVisible(true);
private void findTheObject(int x, int y)
     for (int i=0; i < v.size(); i++)
          m = (Mobject)v.get(i);
          if (x >= m.x && y >= m.y && x <= m.x+30 && y <= m.y+30)
               iv = i;
private void putTheObject(int x,int y)
     iv = -1;
     dx = -1;
public void paint(Graphics g)
     if (img == null)
          img = (BufferedImage)this.createImage(getWidth(),getHeight());
          mg = img.getGraphics();
     mg.setColor(Color.white);
     mg.fillRect(0,0,getWidth(),getHeight());
     for (int i=0; i < v.size(); i++)
          m = (Mobject)v.get(i);
          if (iv == i)
               m.x = dx;
               m.y = dy;
          m.draw(mg);
     g.drawImage(img,0,0,null);
public void update(Graphics g)
     paint(g);
public class Mobject
     int x,y,t;
public Mobject(int t, int x, int y)
     this.t = t;
     this.x = x;
     this.y = y;
public void draw(Graphics g)
     if (t == 1)
          g.setColor(Color.red);
          g.fillRect(x,y,30,30);
     if (t == 2)
          g.setColor(Color.orange);
          g.fillOval(x,y,30,30);
     if (t == 3)
          g.setColor(Color.blue);
          g.fillOval(x,y,50,30);
public static void main (String[] args)
     new Omove();
Noah

Panel refreshing and double buffering

Hi all swing experts
Could any one solve the problem.I have an application,which is having a JSplit pane.
On the left of the JSplit pane , there is a tree. When u click a node from the tree
that will be selected and you can place that node into the right side panel.
And the same way you can click an another node (redirection or sink) and drop into the
panel.you can draw a line by clicking the source and the sink / or redirection.
The line is getting drawn dynamically by getting the x,y coordinates of the node.
once the line is drawn am storing the line into vector, since this is getting drawn
dynamically once if i minimize and maxmize it will disappear.
For avoiding this am trying to redraw the old line from the vector when the window
is getting activated, here the problem starts it draws the line but the line
is getting disappeared immly.
HOW DO I SOLVE THIS?
is it possible to solve this problem with double buffering tech? if so how?
PL HELP.
Software - Visual Tool
Last Modified -7/23/01
sami
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.TitledBorder;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.plaf.FontUIResource;
import javax.swing.tree.*;
import java.lang.System;
import java.net.*;
import java.awt.image.*;
import javax.swing.event.*;
public class CompTree extends JFrame implements TreeSelectionListener,WindowListener{
// Swing components declarations
     public JSplitPane jSplitPane1,jSplitPaneTop;
     public JScrollPane treeScrollPane,splitScrollPane;
public JTree mainTree,jtree ;
public static DefaultMutableTreeNode topchildnode1, topchildnode2, topchildnode3,toptreenode;
DrawPanel dp = new DrawPanel();
     public int i=0;
     public int j=0;
     public int flag = 1 ;
     public String var,S,R,D;
Frame fr = new Frame("GUI TOOL");
public CompTree()
     File nFile = null ;
     mainTree = DrawTree(nFile,"N") ;
     mainTree.updateUI();
     mainTree.setBackground(new Color(105,205,159));
          // Tree is getting added into scroll pane
     treeScrollPane = new JScrollPane(mainTree);
          treeScrollPane.setVerticalScrollBarPolicy(javax.swing.JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
treeScrollPane.setHorizontalScrollBarPolicy(javax.swing.JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
          splitScrollPane = new JScrollPane();
          splitScrollPane.setViewportView(dp.panel1);
          splitScrollPane.setVerticalScrollBarPolicy(javax.swing.JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
splitScrollPane.setHorizontalScrollBarPolicy(javax.swing.JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
jSplitPane1 = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,treeScrollPane,splitScrollPane);
     jSplitPane1.setOneTouchExpandable(true);
     jSplitPane1.setContinuousLayout(true);
jSplitPane1.addComponentListener(new ComponentAdapter(){
          public void componentResized(ComponentEvent e) {
               System.out.println("Componenet resized");
          flag = 1;
          paint(dp.panel1.getGraphics());
//Provide minimum sizes for the two components in the split pane
Dimension minimumSize = new Dimension(150,75);
          splitScrollPane.setMinimumSize(minimumSize);
//Provide a preferred size for the split pane
jSplitPane1.setPreferredSize(new Dimension(700, 500));
          //setContentPane(jSplitPane1);
          fr.add(jSplitPane1);
          fr.setSize(700,500);
          fr.setVisible(true);
          fr.addWindowListener(this);
public void windowActivated(WindowEvent we){
     System.out.println("activated");
     dp.draw();
public void windowClosed(WindowEvent we){System.out.println("closed");}
public void windowIconified(WindowEvent we){System.out.println("iconified");}
public void windowDeiconified(WindowEvent we){
     dp.draw();
     System.out.println("deiconified");
public void windowDeactivated(WindowEvent we){System.out.println("deactivated");}
public void windowOpened(WindowEvent we){
     dp.repaint();
     System.out.println("opened");
public void windowClosing(WindowEvent we){
     System.exit(0);
     System.out.println("closing");
     public void valueChanged(TreeSelectionEvent e) {
          DefaultMutableTreeNode node = (DefaultMutableTreeNode)
          mainTree.getLastSelectedPathComponent();
          String strRootNode = "" ;
          try{
               Object rootNode = node.getRoot();
               strRootNode = rootNode.toString() ;
          catch(Exception eRoot)
               System.out.println("Error in geting Root Node");
          if (node == null) return;
          Object nodeInfo = node.getUserObject();
          TreeNode ParentNode = node.getParent();
          final String strParentName = node.toString() ;
               if (strParentName.equals("Source"))
          System.out.println("Before source");
          var = "S";
          System.out.println("This is source");
          else if (strParentName.equals("Redirection"))
var ="R";
          else if (strParentName.equals("Sink") )
               var ="D";
          else
               if ( strRootNode != strParentName){
     public JTree DrawTree( File file, String strIsValid)
               jtree = new JTree();
               toptreenode = new DefaultMutableTreeNode("Start");
               topchildnode1 = new DefaultMutableTreeNode("Source");
               topchildnode2 = new DefaultMutableTreeNode("Sink");
               topchildnode3 = new DefaultMutableTreeNode("Redirection");
               toptreenode.add(topchildnode1);
               toptreenode.add(topchildnode2);
               toptreenode.add(topchildnode3);
               jtree.putClientProperty("JTree.lineStyle", "Angled");
               DefaultTreeModel defaulttreemodel = new DefaultTreeModel(toptreenode);
               jtree.setModel(defaulttreemodel);
               DefaultTreeSelectionModel defaulttreeselectionmodel = new DefaultTreeSelectionModel();
               defaulttreeselectionmodel.setSelectionMode(1);
               jtree.setSelectionModel(defaulttreeselectionmodel);
               jtree.addTreeSelectionListener(this);
               jtree.setEditable(true);
               return jtree;
public static void main(String args[]){
     CompTree ct = new CompTree();
     * This class contains all the component related to panel 1
     * this can be used for .....
public class DrawPanel extends JPanel implements ActionListener,
     ComponentListener,MouseListener,KeyListener{
     public JRadioButton uniRadio,multiRadio,show;
     public JButton sBut,rBut,dBut;
     public int flag = 1 ;
     public int Radio = 1;
     public boolean sIndicator = true;
     public boolean rIndicator = true;
     public boolean isDestSelected = false;
     public boolean isDestFirstTime = true;
public int x1 = 0 ;
     public int y1 = 0 ;
     public int x2 = 0 ;
     public int y2 = 0;
     public int x3 = 0;
     public int y3 = 0;
     public int k=0;
     public int l = 40;
public int b = 40;
     public String connection1,connection2,connection3,destination1,destination2;
     public int locX;
     public int locY;
public JPanel panel1 = new JPanel ();
public JPanel panel2 = new JPanel ();
     Vector lines = new Vector();
     Vector colors = new Vector();
     Vector obj = new Vector();
Vector source = new Vector();
     Vector loc = new Vector();
     BasicStroke stroke = new BasicStroke(2.0f);
Icon compImage = new ImageIcon("network1.gif"); //new
Icon workImage = new ImageIcon("tconnect02.gif");
Icon lapImage = new ImageIcon("server02.gif");
     public DrawPanel(){
     am adding radio button for checking the mode unicast and broad cast mode -- new
uniRadio = new JRadioButton("Unicast Mode");
uniRadio.setMnemonic(KeyEvent.VK_B);
uniRadio.setSelected(true);
multiRadio = new JRadioButton("Broadcast Mode");
multiRadio.setMnemonic(KeyEvent.VK_C);
show = new JRadioButton("show Panel");
show.setMnemonic(KeyEvent.VK_C);
     ButtonGroup group = new ButtonGroup();
group.add(uniRadio);
group.add(multiRadio);
          group.add(show);
     /*     Border border = ButtonGroup.getBorder();
          Border margin = new EmptyBorder(10,10,10,10);
          ButtonGroup.setBorder(new CompoundBorder(border,margin)); */
          uniRadio.addActionListener(this);
     multiRadio.addActionListener(this);
          show.addActionListener(this);
panel1.add(uniRadio);
          panel1.add(multiRadio);
          panel1.add(show);
          uniRadio.setBounds(150,15,100,40);
          multiRadio.setBounds(260,15,120,40);
          show.setBounds(390,15,100,40);
          uniRadio.setBackground(new Color(105,200,205));
          multiRadio.setBackground(new Color(105,200,205));
          show.setBackground(new Color(105,200,205));
          /*****************PANEL 1*********************/
          panel1.setLayout(null);
panel1.setBounds(new Rectangle(0,0,400,400));
          panel1.setBackground(new Color(105,100,205));
          panel1.addComponentListener(this);
          panel1.addMouseListener(this);
     public void sourceObject(String name)
sBut = new JButton(compImage);
     panel1.add(sBut);
     sBut.setMnemonic(KeyEvent.VK_F);
     sBut.setBounds(new Rectangle(locX,locY,l,b));
     sBut.addActionListener(this);
     sBut.addMouseListener(this);
     sBut.addKeyListener(this);
System.out.println("am inside the source object") ;
     sBut.setBackground(new Color(105,100,205));
     System.out.println("key number" +sBut.getMnemonic());
     System.out.println("MY LOCATION : SBUT : "+ sBut.getLocation());
     public void redirectionObject(String name)
     rBut = new JButton(workImage);
     panel1.add(rBut);
     rBut.setBounds(new Rectangle(locX,locY,l,b));
rBut.addActionListener(this);
     rBut.addMouseListener(this);
     rBut.addKeyListener(this);
     rBut.setBackground(new Color(105,100,205));
System.out.println("am inside the redirection :" + j) ;
System.out.println("MY LOCATION : RBUT : "+ rBut.getLocation());
public void destinationObject(String name){
     dBut = new JButton(lapImage);
     panel1.add(dBut);
     dBut.setBackground(new Color(105,100,205));
System.out.println("am inside the destination object") ;
dBut.setBounds(new Rectangle(locX,locY,l,b));
     System.out.println("am inside the destination:" + j) ;
     dBut.addActionListener(this);
     dBut.addMouseListener(this);
     dBut.addKeyListener(this);
     System.out.println("MY LOCATION : DBUT : "+ dBut.getLocation());
public void paintComponent(Graphics g){
super.paintComponent(g);
     System.out.println("inside paint");
     Graphics2D g2 = (Graphics2D) g;
g2.setStroke(stroke);
if(flag == 1){
     /* this is for drawing current line, this will be drawn when component event happens */
          g.setColor(getForeground());
System.out.println("inside flag");
int np = lines.size();
                    System.out.println("Total number of lines present the buffer to draw :" + np);
                         for (int I=0; I < np; I++) {
     Rectangle p = (Rectangle)lines.elementAt(I);
                    g2.setColor((Color)colors.elementAt(I));
                         System.out.println("width" + p.width);
                         g2.setColor(Color.red);
                    //     g2.setPaint(p.x,p.y,p.width,p.height);
                         g2.drawLine(p.x,p.y,p.width,p.height);
                         System.out.println("$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$");
                         System.out.println(obj.elementAt(I));
                         System.out.println("$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$");
                         System.out.println(p.x +"," +","+ p.y + ","+ ","+ p.width+ "," + ","+ p.height);
flag = -1;
}else if(flag == -1){
     if(x1 != 0 && y1 != 0 && x2 != 0 && y2 != 0 ){
connection1 = "source to redirection";
g2.setColor(Color.red);
     g2.drawLine(x1,y1,x2,y2);
     lines.addElement(new Rectangle(x1,y1,x2,y2));
     colors.addElement(getForeground());
     obj.addElement(connection1);
     x1 = 0 ;y1 = 0 ;
     x2 = 0 ;y2 = 0 ;
else if (x2 != 0 && y2 != 0 && x3 != 0 && y3 != 0 )
          connection2 = "Redirection to Destination";
          g2.setColor(Color.green);
               g2.drawLine(x2,y2,x3,y3);
colors.addElement(getForeground());
               lines.addElement(new Rectangle(x2,y2,x3,y3));
               obj.addElement(connection2);
               x2 = 0; y2 = 0 ;
               x3 = 0 ; y3 = 0 ;
else if (x1 != 0 && y1 != 0 && x3 != 0 && y3 != 0)
               connection3 = "Source to Destination";
               g2.setColor(Color.red);
               g2.drawLine(x1,y1,x3,y3);
colors.addElement(getForeground());
               lines.addElement(new Rectangle(x1,y1,x3,y3));
               obj.addElement(connection3);
                    x1 = 0; y1 = 0 ;
                    x3 = 0 ; y3 = 0 ;
                    /*     Image offscreen = panel1.createImage(400,400);
          Graphics og = offscreen.getGraphics();
     og.drawLine(200,200,500,500);
          g.drawImage(offscreen,0,0,null); */
// Component Listener's method
public void componentHidden(ComponentEvent e) {
if(e.getSource().equals(panel1)){System.out.println("Componenet Hidden");}
          System.out.println("Componenet Hidden");
public void componentMoved(ComponentEvent e) {
          System.out.println("Componenet moved");
          draw();
public void componentResized(ComponentEvent e) {
          System.out.println("Componenet resized");
          flag = 1;
          paintComponent(panel1.getGraphics());
public void componentShown(ComponentEvent e) {
          System.out.println("Componenet Shown");
// Mouse Listerner's Method
     public void mouseClicked(MouseEvent me){
if (me.getSource().equals(panel1))
          System.out.println("inside mouse clicked");
                    if(var == "S"){
the boolean sIndicator will allow the usage of source object only once
     This is the case for both unicast and multi cast.It has been restricted
     to single use.
                         if (sIndicator){
                         System.out.println("inside mouse clicked");
                    System.out.println("locX" + locX);
                    locX = me.getX();
locY = me.getY();
               sourceObject("Source");
                         sIndicator = false;
                    }else{}
          }else if (var == "R")
if(rIndicator){
if(!isDestSelected){
System.out.println("redirection" + locX);
locX = me.getX();
locY = me.getY();
               redirectionObject("Redirection");
               rIndicator = false;
               }else{}
} else{}
          }else if(var == "D"){
          if(Radio == 1 && isDestSelected == false){
          System.out.println("Destination -- uni cast mode" + locX);
locX = me.getX();
locY = me.getY();
               destinationObject("Sink");
          isDestSelected = true;
          } else if (Radio == 2)
                              System.out.println("Destination -- Multicast mode" + locX);
                              locX = me.getX();
                              locY = me.getY();
                              destinationObject("Sink");
                              isDestSelected = true;
     public void mousePressed(MouseEvent me){System.out.println("am inside mouse pressed"); }
     public void mouseReleased(MouseEvent me){
          System.out.println("am inside mouse released");
          paintComponent(panel1.getGraphics());
     public void mouseEntered(MouseEvent me){}
     public void mouseExited(MouseEvent me){}
// key Listener
public void keyReleased(KeyEvent e) {
                    Component compo =(JButton)e.getSource();
                         if (e.getKeyChar() == e.VK_DELETE){
                         remove(compo);
          public void keyTyped(KeyEvent e) {}
          public void keyPressed(KeyEvent e){}
public void remove(Component comp){
System.out.println("inside delete key" );
     panel1.remove(comp);
     panel1.repaint();
     public void draw(){
          super.paint(panel1.getGraphics());
          System.out.println("inside draw");
          flag = 1;
          paintComponent(panel1.getGraphics());
     public void actionPerformed(ActionEvent e)
                         if(e.getSource().equals(sBut)){
                              System.out.println("am s button");
                              x1 = sBut.getX() + l;
                              y1 = sBut.getY() + (b/2);
                         else if(e.getSource().equals(rBut)){
                              System.out.println("am r button");
                              x2 = rBut.getX() ;
                              y2 = rBut.getY()+ b/2;
                              System.out.println("x2 : " + x2 + "y2 :" +y2 );
                         else if(e.getSource().equals(dBut)){
                              System.out.println("am d button");
                              x3 = dBut.getX();
                              y3 = dBut.getY()+ b/2;
                         else if (e.getSource().equals(uniRadio)){
                              System.out.println("uni radio");
                              Radio = 1 ;
                         } else if (e.getSource().equals(multiRadio)){
                                   System.out.println("multi radio");
                                   Radio = 2;
                         } else if (e.getSource().equals(show)){
                              System.out.println("inside show");
*********************************************

ok
i don't take a long time tracing your code, but i think u have to overwrite the repaint methode so it 's call the methode which will paint the line each time.
hope this will help!

Double buffering for shape animation

Hello people,
I'm building an applet which animates some text (a shape with various setting for stroke, fill, etc.) and translating it from x1 to x2 using AffineTransform. How can I clear the screen to create an animation effect and double buffering to avoid flickering? Double buffering can be used with ImageS, but what about ShapeS?
Many thanks

Double buffering is a general concept that applies to all
graphic objects.

Using 6533 DIO32HS, is it possible to use double buffered output with varying pauses?

I'm using Level-Ack handshaking to transmit data. Currently, I'm hooked up to a loop-back on the DIO32HS card.
If I don't use double-buffering, I end up with pauses in data transmission, so I need to use double buffering. Unfortunately, I can't seem to set up a delay in the middle of a double buffered scheme.
What I need to do is this:
Transmit 64 packets of data (16 bits each) on group 2 / Receive 64 packets of data (16 bits each) on group 1
Delay for .2 ms
Transmit the same packets again / receive
The delay in the middle will need to be varied, from .2 to 20 ms.
I'm programming in Visual C++ 6.0 under Windows 2000, with (as suggested above) group1 c
onfigured as input (DIOA and DIOB) and group2 set up as output (DIOC and DIOD). Due to the speed of transmission (256kHz) and the small size of the data set, the program I wrote, no matter how tight I try to make it, cannot insert the proper delay and start the next send on time.
Does anyone have any idea if such a pause is possible? Anyone know how to do it, or any suggestions on what to try?
Thanks!

.2 ms is a very small time delay to use in software. Windows usually isn't more accurate than about 10 or 20 ms. If you need to have small, precise delays you could either use a real time OS, like pharlap and LabVIEW RT, or use extra hardware to generate the delays correctly.
I would recommend using a separate MIO or counter/timer board (like a 660x) to generate timing pulses for the DIO32HS. This gives you precise timing control at high speed. If the 32HS is in Level ACK Mode, it will respond to external ACK and REQ signals. This is covered in more detail on page 5-10 of the PCI-DIO32HS User Manual.

Can i use double buffering with SCAN_Sequence_Setup and sample rate divisors?

If possible I would like to use double buffering when acquiring multiple channels at different rates using SCAN_Sequence_Setup. What are the tricks to sizing the buffers, if any.
PCI-MIO-16Xe-10 and PCI-6052E are the boards I'm writing for, using Borland C++ builder under Windows2000
Thanks,
Brady

Hello;
At this time, you can't set up a multiple Scan Rate for different channels at same DAQ board. But, you can set up your Sample Rate to the fastest required to acquire you fastest channel, and then discard the readings of the other channels and only take the values for the different channels at their theoretical rate.
Hope this helps.
Filipe

Double buffering circle not round anymore

I am making an applet where some circles are painted to the screen. When not using the double buffering scenario, the shapes appear correctly.
The problem is when i use the double-buffering technique, the circles are still there, but they look like very ugly. I would call that some "squarcles".
What is the bug here and how to get some decent double buffering with thoses circles?

Ok, i had some problem with the running thread when closing the applet viewer, but now this situation is corrected by setting the animation thread to null before calling stop().
Maybe explanation of the problem is not clear, so i made two versions of the same applet with only 2 lines of code different so that there is one applet that is not double buffered.
You can check these by yourself at this place:
Double buffered circles: http://www.geocities.com/xeneve/cooltrail/ demo_cooltrail.htm
No double buffer:
http://www.geocities.com/xeneve/cooltrail/demo_cooltrail_ndb.htm
This is just annoying to get this result. I realise that maybe not many peoples are coding applets so i guess there is few people that may have a workaround for this.

Double Buffering +MVC

been trying to implement double buffering but to no avail, have read a lot of articles online about implementing double buffering which seems relitivly straight forward and code that I developed matches what they have; the only problem that I have is that it is not calling update(graphics g) to get it to repaint, but instead calls update(Observable arg0, Object arg1) which I use for my mvc implementation. I've been toiling wiht this for days and not getting anywhere with it.
Any Ideas - on how this could be resolved??
TIA

i'm using swing, Then your question should be posted in the Swing forum.
but doesn't call the update method that I have overriddenI don't know why you are overriding update(). If you want a component to repaint itself then you use the repaint() method.
This posting, from the Swing forum, has a couple examples of animation.

Sprite animation with double buffering

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