Animation Delay`

Hi,
I have a logo that I am animating here: http://agtdesigns.co.uk/logo.gif
Basically I want the man to spin inside the circle. However, on the last frame/state of the animation it appears to stop/delay before moving onto the next frame. To solve this I set the delay for the last state to 0. When palying back the animation in Fireworks it is perfectly smooth with no delay.
However when exporting the file the delay is still there, I have the 'include when exporting' option ticked for the last frame but it doesnt seem to be working.
I am using Fireworks CS5, any help would be greatly appreciated.
tia,
Andy

Nevermind, I realised I had a duplicate frame at the end.

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I am new to Java and I am trying a simple bouncing ball example from Stanford. Here is their simple example that works.
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import acm.graphics.*;
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"Exception in thread "Thread-4" java.lang.NullPointerException
at BouncingBallNotWorking.run(BouncingBallNotWorking.java:36)
at acm.program.Program.runHook(Program.java:1592)
at acm.program.Program.startRun(Program.java:1581)
at acm.program.AppletStarter.run(Program.java:1939)
at java.lang.Thread.run(Unknown Source)"
Can you describe why I am getting an error? Thanks.
Here is what I changed.
Before:
     private void setup(double X_coor, double Y_coor) {
          BallA = new GOval(X_coor, Y_coor, DIAM_BALL, DIAM_BALL);
          add(BallA);
     }After:
     private void setup(double X_coor, double Y_coor, GOval BallObject) {
          BallObject = new GOval(X_coor, Y_coor, DIAM_BALL, DIAM_BALL);
          add(BallObject);
     }Here is the complete code.
* File:BouncingBall.java
* This program graphically simulates a bouncing ball
import acm.program.*;
import acm.graphics.*;
import java.awt.*;
public class BouncingBallNotWorking extends GraphicsProgram {
/** sets diameter */
private static final int DIAM_BALL = 30;
/** amount y velocity is increased each cycle */
private static final double GRAVITY = 3;
/** Animation delay or pause time between ball moves */
private static final int DELAY = 50;
/** Initial X and Y location ball*/
private static final double X_START = DIAM_BALL / 2;
private static final double Y_START = 100;
private static final double X_VEL = 3;
private static final double BOUNCE_REDUCE = 0.9;
private double xVel = X_VEL;
private double yVel = 0.0;
private GOval BallA;
public void run() {
setup(X_START,Y_START, BallA);
//         Simulation ends when ball goes off right hand
//         end of screen
while (BallA.getX() < getWidth()) {
moveBall(BallA);
checkForCollision(BallA);
pause(DELAY);
private void setup(double X_coor, double Y_coor, GOval BallObject) {
BallObject = new GOval(X_coor, Y_coor, DIAM_BALL, DIAM_BALL);
add(BallObject);
private void moveBall(GOval BallObject) {
yVel += GRAVITY;
BallObject.move(xVel,yVel);
private void checkForCollision(GOval BallObject) {
if(BallObject.getY() > getHeight() - DIAM_BALL){
yVel = - yVel * BOUNCE_REDUCE;
double diff = BallObject.getY() - (getHeight() - DIAM_BALL);
BallObject.move(0, -2 * diff);
} Edited by: TiredRyan on Mar 19, 2010 1:47 AM

TiredRyan wrote:
That is great! Thanks. I've got two question though.
1.) Now I want to have 100 bouncing balls. Is the best way to achieve this is through an array of GOvals? I haven't gotten to the lecture on arrays on Stanford's ITunesU site yet so I am not sure what is possible with what I know now.An array would work, or a List. But it doesn't matter much in this case.
2.) Are references being passed by value only applicable to Java or is that common to object-oriented programming? Also is there a way to force Java to pass in "BallA" instead of the value "null"?I can't say about all OO languages as a whole, but at least C++ can pass by reference.
And no, there's no way to pass a reference to the BallA variable, so the method would initialize it and it wouldn't be null anymore.
When you call the method with your BallA variable, the value of the variable is examined and it's passed to the method. So you can't pass the name of a variable where you'd want to store some object you created in the method.
But you don't need to either, so there's no harm done.

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     *@param col the the designated column
     *@return the disk identification number
    public static int getDiskId(int col){
        int diskIdent = 0;
        /* initialize the row number to max -1, because the array start at 0 */
        int row = MAX_DISKS - 1;
        /* do a cell check while row is greater than 0
         *this is done so that is starts at the top row
         *and moves down
        while (row > EMPTY_CELL_VALUE){
            /* when the first cell that is not -1 is reached get the disk number
             *that disk will be the smallest in the stack */
            if(diskCells[row][col] != -1){
                //diskIdent = this.diskCells[row][col];
                diskIdent =diskCells[row][col];
                break;
            row--;
        return diskIdent;
     *returns the first available row
     *@param col the designated col
     *@return the first available row number
    public static int getRow(int col){
        int rowNumber = 0;
        /* cycle through the cells until it finds an empty one */
        while (diskCells[rowNumber][col] != -1){
            rowNumber++;
        return rowNumber;
     *calculate the total time it takes for the tower of hanoi game to be
     *solved, given the amount of disk and the amount of time it takes
     *to physically move a disk from one pole to the other.
    public static void totalTime(){
        int timeInSeconds = setPhysicalDelay * intMovesLeft;
        int i = 0;
        int seconds = 0;
        int minute = 0;
        int hour = 0;
        int day = 0;
        int month = 0;
        int year = 0;
        while (i < timeInSeconds){
            if(seconds > 60){
                minute++;
                seconds = 0;
            if(minute > 60){
                hour++;
                minute = 0;
            if(hour > 24){
                day++;
                hour = 0;
            if(day > 30){
                month++;
                day = 0;
            if(month > 12){
                year++;
                month = 0;
            seconds++;
            i++;
        updateMessageCenter("It would take:" + year + " years " + month + " months " + day +
                " days " + hour + " hours " + minute + " minutes and " + seconds + " seconds, to move " + setDiskAmount +
                " disks at " + setPhysicalDelay + " seconds per move");


Sorry if my post was a little too cryptic...
"How do you know? You have a problem you can't solve. Anything could be your issue." Agreed. However, using the process of elimination and debug statments I have been able to narrow the scope of the issue.
"If you can't solve it by executing the code and adding debug statements how to you expect us to help."If I could solve but "executing code and adding debug statements" there would be no need to post the problem here.
"We don't know exactly what you are attempting to do."Trying to paint my graphics to a JPanel based on a set of co ordinates.
"We don't know why you are passing the Graphics object around."Why not? is it impossible to do it this way?
"The big problem is in the alogorithm you use to determine the location of each component."Who said you couldn't read minds?
"If you are using some kind of animation then I would use a Timer to schedule the moving of components. I don't even see how you are doing this in your code."Sorry I guess stating that I didn't post my entire code may have threw things off...I do use a timer in a seperate class. I will include it in the next post.
"I can't tell if you are using Threads of not."guess you overlooked these lines of code:
                /* create and start a new thread. This is EXTREMELY important
                 *as it allows for GUI to be repainted while the soulution
                 *is animated */
                SolveEngine s = new SolveEngine();
                s.start();   Here is the code once again:
public class HanoiFrame extends javax.swing.JFrame {
    private static final int STATE_SETUP = 0;
    private static final int STATE_ANIMATE = 1;
    private static final int POLE_AREA_HEIGHT = 356;
    private static final int POLE_AREA_WIDTH = 205;
    private static final int DISK_ARC_HEIGHT = 15;
    private static final int DISK_ARC_WIDTH = 15;
    private static final int DISK_HEIGHT = 23;
    private static final int MAX_DISKS = 10;
    private static final int MAX_ANIMATION_DELAY = 30000;
    private static final int MAX_PHYSICAL_DELAY = 100000;
    private static final int MIN_DISKS = 1;
    private static final int MIN_ANIMATION_DELAY = 1;
    private static final int MIN_PHYSICAL_DELAY = 1;
    private static final int EMPTY_CELL_VALUE = -1;
    private static final int CELL_HEIGHT = 25;
    private static final int COLUMNS = 3;
    private static final int ROW = 11;
    private static final int MILLISECONDS_PER_SECOND = 1000;
    private final static String newline = "\n";
    private static Disk[] disks;
    private static Disk newDisk;
    private static int[][] diskCells;
    public static int startX = 2;
    public static int startY = 340;
    public static int setDiskAmount = 0;
    public static int setAnimationDelay = 0;
    public static int setPhysicalDelay = 0;
    public static int moveNumber = 0;
    public static int intMovesLeft = 0;
    private boolean buttonPressed = false;
    private double movesLeft = 0;
    private int windowState = 0;
    /** Creates new form HanoiFrame */
    public HanoiFrame() {
        initComponents();
        /* initialize the "poles" to hold a certain number of "cells */
        this.diskCells = new int[ROW][COLUMNS];
        for (int row = ROW - 1;row >= 0; row--) {
            for (int col = 0;col < COLUMNS ; col++) {
                diskCells[row][col] = EMPTY_CELL_VALUE;
    private void resetButtonActionPerformed(java.awt.event.ActionEvent evt) {
        /* reset all the variable to original state */
        setDiskAmount = 0;
        setAnimationDelay = 0;
        setPhysicalDelay = 0;
        moveNumber = 0;
        movesLeft = 0;
        intMovesLeft = 0;
        buttonPressed = false;
        windowState = 0;
        this.startButton.setEnabled(true);
        this.diskAmount.setEditable(true);
        this.animationDelay.setEditable(true);
        this.physicalDelay.setEditable(true);
        /* reset all the cell vales to empty (this could be its own function) */
        for (int row = ROW - 1;row >= 0; row--) {
            for (int col = 0;col < COLUMNS ; col++) {
                diskCells[row][col] = EMPTY_CELL_VALUE;
        /* reset the content of the TextFields and Area */
        this.diskAmount.setText("");
        this.animationDelay.setText("");
        this.physicalDelay.setText("");
        this.outTextArea.setText("");
        /* repaint the display panel */
        this.hanoiPanel.repaint();
    /* i have no idea why this is here...It was generated by Netbeans when I
     *made the reset button. As you can see it made 2. The one above it the same
     *except it contains code. Since it was automatically generated
     *I cannot delete it.
    private void resetButtonMouseReleased(java.awt.event.MouseEvent evt) {
    /* is executed when the start button is pressed.
     *also executes a field check and intializes key variables. Finally,
     *it executes the solution and generates the solve time
    private void startButtonMouseReleased(java.awt.event.MouseEvent evt) {
        /* check if the program has already been run (without being reset) */
        if (!buttonPressed){
            /* check the fields to ensure the input is correct and useable */
            if (checkFields()){
                /* give button a pressed status if all info valid */
                buttonPressed = true;
                windowState = 1;
                /* disable the button */
                this.startButton.setEnabled(false);
                /* disable the fields */
                this.diskAmount.setEditable(false);
                this.animationDelay.setEditable(false);
                this.physicalDelay.setEditable(false);
                /* setup the disks on the starting pole */
                setup();
                /* initialize the number of moves required. 2 to the power of n minus 1 */
                movesLeft = Math.pow(2, setDiskAmount) - 1;
                /* convert the number to an integer */
                intMovesLeft = (int)movesLeft;
                /* set the physical delay */
                setPhysicalDelay = Integer.parseInt(this.physicalDelay.getText());
                /* create and start a new thread. This is EXTREMELY important
                 *as it allows for GUI to be repainted while the soulution
                 *is animated */
                SolveEngine s = new SolveEngine();
                s.start();
     *Check all the fields at once to ensure that they are valid
    private boolean checkFields(){
        String numberOfDisks = null;
        String animationDelay = null;
        String physicalDelay = null;
        numberOfDisks = this.diskAmount.getText();
        animationDelay = this.animationDelay.getText();
        physicalDelay = this.physicalDelay.getText();
        /* initiate my array of error messages */
        ArrayList errMsg = new ArrayList(0);
        /* check if the number of disks was left blank */
        if (numberOfDisks.equals("")){
            errMsg.add("Please enter the Number of Disks (MAX " + MAX_DISKS + ")");
        }else{
            /* check if the input given is valid */
            try {
                /* parse the disk amount entered into an integer */
                setDiskAmount = Integer.parseInt(numberOfDisks);
                /* check the # of disks entered is greater than 0 and less than 10 */
                if (setDiskAmount < MIN_DISKS){
                    errMsg.add("Number of Disks must be greater than " + MIN_DISKS);
                } else if (setDiskAmount > MAX_DISKS){
                    errMsg.add("Number of Disks must be less than" + MAX_DISKS);
            } catch (NumberFormatException ex) {
                errMsg.add("Number of Disks must be a Number");
        /* check if animation delay was left blank */
        if (animationDelay.equals("")){
            errMsg.add("Please enter disk Animation Delay");
        } else {
            /* check if the input given is valid */
            try {
                /* parse the animation delay entered into an integer */
                setAnimationDelay = Integer.parseInt(animationDelay);
                /* check range of animation delay */
                if (setAnimationDelay < MIN_ANIMATION_DELAY){
                    errMsg.add("Animation Delay must be greater than 0");
                } else if (setAnimationDelay > MAX_ANIMATION_DELAY){
                    errMsg.add("Animation Delay must be less than " + MAX_ANIMATION_DELAY);
            } catch (NumberFormatException ex) {
                errMsg.add("Animation Delay must be a Number");
        /* check if physical delay was left blank */
        if (physicalDelay.equals("")){
            errMsg.add("Please enter the Physical disk delay");
        } else {
            /* check if the input given is valid */
            try {
                /* parse the physical delay entered into an integer */
                setPhysicalDelay = Integer.parseInt(physicalDelay);
                /* check check the range of the physical delay */
                if (setPhysicalDelay < MIN_PHYSICAL_DELAY){
                    errMsg.add("Physical Delay must be greater than 0");
                } else if (setPhysicalDelay > MAX_PHYSICAL_DELAY){
                    errMsg.add("Physical Delay must be less than " + MAX_PHYSICAL_DELAY);
            } catch (NumberFormatException ex) {
                errMsg.add("Physical Delay must be a Number");
        /* if there is any problem, add the message to the popup and display */
        if (!errMsg.isEmpty()){
            JOptionPane.showMessageDialog(this, errMsg.toArray());
            return false;
        return true;
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new HanoiFrame().setVisible(true);
    /*returns the Animation panel area graphics
     *@return Animation area graphics
    public static Graphics getAnimationArea(){
        /* get the usable area of poleA */
        Container clientArea = hanoiPanel;
        //Container clientArea = this.getContentPane();
        /* get the graphics to the display panel*/
        Graphics gfx = clientArea.getGraphics();
        return gfx;
     *set up the requested amount of disks on the first pole
     *@param diskAmount the amount of disks entered by the user
    public void setup(){
        int numberOfDisks = setDiskAmount;
        this.disks = new Disk[numberOfDisks];
        int diskNumber = 0;
        int diskWidth = POLE_AREA_WIDTH - 4;
        int arcH = DISK_ARC_HEIGHT;
        int arcW = DISK_ARC_WIDTH;
        int x = startX;
        int y = startY;
        int row = 0;
        int col = 0;
        /* get the graphics to the display panel*/
        //Graphics gfx = getAnimationArea();
        /* set the color of the disks */
        //gfx.setColor(Color.MAGENTA);
        /* draw the specified number of disks */
        while (diskNumber < numberOfDisks){
            /* reduce the y position */
            y = startY - diskNumber * CELL_HEIGHT;
            /* draw the disk */
            //gfx.fillRoundRect(x, y, diskWidth, DISK_HEIGHT, arcH, arcW);
            /* create a new instance of disk */
            newDisk = new Disk(x, y, diskWidth);
            /* give the new disk an id */
            this.disks[diskNumber] = newDisk;
            /* add the id to the cell array of poleA */
            this.diskCells[row][col] = diskNumber;
            /* make the disk smaller and center */
            x = x + 8;
            diskWidth = diskWidth - 16;
            /* increase disk number */
            diskNumber++;
            /* move to the next row */
            row++;
        repaint();
     *move the disk from a source pole to the destination pole.
     *this should take the source col and destination col to determine where to draw the
     *disk. It will also need to know to draw the disk in the first available cell
     *in a col
     *@param source the starting pole of the next move
     *@param destination the end pole of the next move
    public void moveDisk(int src, int dest){
        /* the lines below would not be necessary if I were to pass the Graphics
         *gfx object as a parameter. I may have to use this option in order
         *to work around the current repainting issue */
        /* get the graphics to the display panel*/
        Graphics gfx = getAnimationArea();
        /* get the id of the disk to be moved */
        int disk = getDiskId(src);
        /* get the to and from rows */
        int sourceRow = getRow(src);
        int destinationRow = getRow(dest);
        /* set the co ordintates of the destination */
        int col = dest * POLE_AREA_WIDTH;
        int x = disks[disk].getStartX() + col;
        int y = startY - (destinationRow * CELL_HEIGHT);
        int width = disks[disk].getDiskWidth();
        disks[disk].setStartX(x);
        disks[disk].setStartY(y);
        disks[disk].setDiskWidth(width);
        //System.out.println("startX " + x);
        //System.out.println("startY " + y);
        //System.out.println("destination row " + destinationRow);
        //System.out.println("disk " + disk);
        //System.out.println("Width " + width);
        diskCells[sourceRow - 1][src] = EMPTY_CELL_VALUE;
        /* set the destination row to the disk id */
        diskCells[destinationRow][dest] = disk;
        drawDisk();
        repaint();
        String output = "";
        //must initialize row to max - 1 and increment 'til = 0
        //since the array position starts at 0
        //this will print the array from the top down
        for (int row = ROW - 1;row >= 0; row--) {
            for (int colm = 0;colm < COLUMNS ; colm++) {
                output = output + diskCells[row][colm];
            output = output + "\n";
        System.out.println(output);
        System.out.println(newline);
    public void drawDisk(){
        int diskNum = setDiskAmount -1;
        int i = 0;
        Graphics gfx = getAnimationArea();
        gfx.setColor(Color.MAGENTA);
        while(diskNum >= 0){
            //System.out.println("here is the disk IDs " + diskNum);
            //System.out.println("the startY during draw " + disks[diskNum].getStartY());
            gfx.fillRoundRect(disks[diskNum].getStartX(), disks[diskNum].getStartY(), disks[diskNum].getDiskWidth(), DISK_HEIGHT, DISK_ARC_WIDTH, DISK_ARC_HEIGHT);
            diskNum--;
    public void paint(Graphics gfx){
        if(windowState == 0){
            super.paint(gfx);
            setup();
        } else if (windowState == 1){
            super.paint(gfx);
            drawDisk();
     *returns the id of the disk
     *@param col the the designated column
     *@return the disk identification number
    public static int getDiskId(int col){
        int diskIdent = 0;
        /* initialize the row number to max -1, because the array start at 0 */
        int row = MAX_DISKS - 1;
        /* do a cell check while row is greater than 0
         *this is done so that is starts at the top row
         *and moves down
        while (row > EMPTY_CELL_VALUE){
            /* when the first cell that is not -1 is reached get the disk number
             *that disk will be the smallest in the stack */
            if(diskCells[row][col] != -1){
                //diskIdent = this.diskCells[row][col];
                diskIdent =diskCells[row][col];
                break;
            row--;
        return diskIdent;
     *returns the first available row
     *@param col the designated col
     *@return the first available row number
    public static int getRow(int col){
        int rowNumber = 0;
        /* cycle through the cells until it finds an empty one */
        while (diskCells[rowNumber][col] != -1){
            rowNumber++;
        return rowNumber;
     *calculate the total time it takes for the tower of hanoi game to be
     *solved, given the amount of disk and the amount of time it takes
     *to physically move a disk from one pole to the other.
    public static void totalTime(){
        int timeInSeconds = setPhysicalDelay * intMovesLeft;
        int i = 0;
        int seconds = 0;
        int minute = 0;
        int hour = 0;
        int day = 0;
        int month = 0;
        int year = 0;
        while (i < timeInSeconds){
            if(seconds > 60){
                minute++;
                seconds = 0;
            if(minute > 60){
                hour++;
                minute = 0;
            if(hour > 24){
                day++;
                hour = 0;
            if(day > 30){
                month++;
                day = 0;
            if(month > 12){
                year++;
                month = 0;
            seconds++;
            i++;
        updateMessageCenter("It would take:" + year + " years " + month + " months " + day +
                " days " + hour + " hours " + minute + " minutes and " + seconds + " seconds, to move " + setDiskAmount +
                " disks at " + setPhysicalDelay + " seconds per move");
     *add the message to the diplay window
     *currently this is not necessary, but may be required to
     *dynamically display the contents of message into the text area
     *@param message the message to be added/appended the the text area
    public static void updateMessageCenter(String message){
        /* append text to the message */
        outTextArea.append(message + newline);
        /* ensure the the most recent line is viewable - auto scroll */
        outTextArea.setCaretPosition(outTextArea.getDocument().getLength());
    public class SolveEngine extends Thread {
        /** Creates a new instance of SolveEngine */
        public SolveEngine() {
        public void run(){
            /* start the engine/animation */
            solutionEngine(HanoiFrame.setDiskAmount,0, 2, 1);
            /* calculate and print the total time after the solution is complete */
            HanoiFrame.totalTime();
     *the recursive solution to the Towers of Hanoi problem
     *@param diskAmount the number of disks that need to be moved
     *@param start the identity of the starting column
     *@param end the identity of the ending column
     *@param temp the identity of the temporary column
        public void solutionEngine(int diskAmount,int start, int end, int temp){
            int disks = diskAmount;
            int startPole = start;
            int endPole = end;
            int tempPole = temp;
            try {
                if ( disks == 1 ) {
                    HanoiFrame.moveNumber++;
                    HanoiFrame.updateMessageCenter("Moving disk from "+ startPole + " to "+ endPole + " Move #: " + HanoiFrame.moveNumber + " of " + HanoiFrame.intMovesLeft);
                    /* delay the movement of the disk */
                    Thread.sleep(HanoiFrame.setAnimationDelay);
                    /* move the disk */
                    moveDisk(startPole, endPole);
                } else {
                    solutionEngine( disks - 1, startPole, tempPole, endPole);
                    HanoiFrame.moveNumber++;
                    HanoiFrame.updateMessageCenter("Moving disk from "+ startPole + " to "+ endPole + " Move #: " + HanoiFrame.moveNumber + " of " + HanoiFrame.intMovesLeft);
                    /* delay the movement of the disk */
                    Thread.sleep(HanoiFrame.setAnimationDelay);
                    moveDisk(startPole, endPole);
                    solutionEngine( disks - 1, tempPole, endPole, startPole);
            } catch (InterruptedException ex) {
                ex.printStackTrace();
    }

Please take a look?

Hello :) My friend is doing his thesis & he's stuck with this program. Unfortunately I don't have Java installed on this comp (in work) so I'm not much use but I was hoping someone here could point him in the right direction. Here goes...
Description: Basic paddle ball type game.
This example midlet demonstrates how to use threads and the Canvas class. It implements
a simple paddle ball type game. It demonstrates how to use a clipping region to implement
graphics more effeciently.
It should animate at a constant speed on all phones, although it may appear
jerky on devices with very restricted processing resources.
@created den 21 mars 2002
COPYRIGHT All rights reserved Sony Ericsson Mobile Communications AB 2003.
The software is the copyrighted work of Sony Ericsson Mobile Communications AB.
The use of the software is subject to the terms of the end-user license
agreement which accompanies or is included with the software. The software is
provided "as is" and Sony Ericsson specifically disclaim any warranty or
condition whatsoever regarding merchantability or fitness for a specific
purpose, title or non-infringement. No warranty of any kind is made in
relation to the condition, suitability, availability, accuracy, reliability,
merchantability and/or non-infringement of the software provided herein.
package midp.demo;
import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
* Basic Ball and Paddle game. Use arrow keys to move paddle.
* Demonstrates multi-threading, animation, event handling.
* @see MIDlet
public class PaddleBall extends MIDlet implements CommandListener {
* Constant for white color
private static final int COLOR_WHITE = 0xFFFFFF;
* Constant for black color
private static final int COLOR_BLACK = 0x000000;
* The game speed (in milliseconds)
private final int GAME_SPEED = 5;
* The main game screen
private GameFrame mainFrame;
* The title screen
private Form titleScreen;
* The results screen
private Form statsScreen;
* The number of milliseconds the user has been playing this game
private long elapsedTime;
* The ball object for this game
private Ball myBall;
* The paddle object for this game
private Paddle myPaddle;
* True if game has not started or player lost
private boolean gameOver = true;
* How many games have been played
private int numGames;
* Reference to Display
private Display myDisplay;
public PaddleBall() {
myDisplay = Display.getDisplay(this);
* Create main game screen
mainFrame = new GameFrame();
* Create title screen
titleScreen = new Form("Paddle Ball");
titleScreen.append(new StringItem(null,
"The classic arcade game, now on your mobile device!"));
titleScreen.setCommandListener(this);
titleScreen.addCommand(new Command("START", Command.OK, 1));
* Create results screen
statsScreen = new Form("Results");
statsScreen.setCommandListener(PaddleBall.this);
statsScreen.addCommand(new Command("AGAIN?", Command.OK, 1));
* Begin the application, show its frame
protected void startApp() {
myDisplay.setCurrent(titleScreen);
* Application is being terminated, kill threads
protected void pauseApp() {
gameOver = true;
myBall = null;
myPaddle = null;
* Clean up application
protected void destroyApp(boolean unconditional) {
gameOver = true;
* Start the game
public void commandAction(Command c, Displayable d) {
* Create ball and paddle threads
myBall = new Ball();
myPaddle = new Paddle();
* Get the starting time
elapsedTime = System.currentTimeMillis();
* Set the initial ball and paddle positions
myBall.setUp();
myPaddle.setUp();
* Set the screen
myDisplay.setCurrent(mainFrame);
* Start the thread
gameOver = false;
myBall.start();
myPaddle.start();
* The main Screen for this game
class GameFrame extends Canvas {
* Canvas receives all key events
public void keyPressed(int keyCode) {
int gameAction = 0;
try {
gameAction = getGameAction(keyCode);
} catch (Exception e) {
if (gameAction == LEFT) {
myPaddle.move(-2 * GAME_SPEED);
} else if (gameAction == RIGHT) {
myPaddle.move(2 * GAME_SPEED);
return;
* Clear the game screen
private void clear(Graphics g) {
g.setColor(0xFFFFFF);
g.fillRect(0, 0, getWidth(), getHeight());
* Paint the game screen
public void paint(Graphics g) {
synchronized (g) {
* Clear the screen
clear(g);
g.setColor(0x000000);
* Paint the ball and paddle
g.fillRect(myPaddle.x, myPaddle.y, myPaddle.WIDTH,
myPaddle.HEIGHT);
g.fillArc(myBall.x, myBall.y, myBall.SIZE,
myBall.SIZE, 0, 360);
* The ball thread
class Ball extends Thread {
* The ball diameter
public final int SIZE = mainFrame.getHeight() / 15;
* The sign of the x component of the velocity
private int xDir = 1;
* The sign of the y component of the velocity
private int yDir = 1;
* X position of ball
int x;
* Y position of ball
int y;
* Create a ball
public Ball() {
setUp();
* Set starting position
void setUp() {
x = mainFrame.getWidth() / 2;
y = mainFrame.getHeight() / 10;
* Loop to run thread, loops until game over
public void run() {
while (!gameOver) {
* Sleep for animation delay
try {
Thread.sleep(150 - 10 * GAME_SPEED);
} catch (Exception e) {
return;
int oldX = x;
int oldY = y;
* Recalculate x position
int xPos = x + xDir * GAME_SPEED;
if (((xPos+SIZE) <= mainFrame.getWidth())
&& (xPos >= 0)) {
x = xPos;
} else {
xDir *= -1;
AlertType.WARNING.playSound(myDisplay);
* Recalculate y position
int yPos = y + yDir * GAME_SPEED;
if ((yPos >= 0) &&
((yPos + SIZE) <=
(mainFrame.getHeight() - myPaddle.HEIGHT))) {
y = yPos;
} else if ((yPos + SIZE) >
(mainFrame.getHeight() - myPaddle.HEIGHT)) {
* Bounce off paddle
if ((xPos <= (myPaddle.x + myPaddle.WIDTH))
&& ((xPos + SIZE) >= myPaddle.x)) {
yDir *= -1;
AlertType.INFO.playSound(myDisplay);
* Player loses
} else {
gameOver = true;
* Get statistic information
elapsedTime = System.currentTimeMillis()
- elapsedTime;
numGames++;
statsScreen.append(new StringItem("Game " +
numGames + " over", "Time: " +
(elapsedTime/1000) + " seconds"));
* Show the statistics screen
myDisplay.setCurrent(statsScreen);
return;
} else if (yPos < 0) {
yDir *= -1;
AlertType.WARNING.playSound(myDisplay);
mainFrame.repaint(Math.min(oldX, x), Math.min(oldY, y),
Math.abs(x-oldX) + SIZE,
Math.abs(y-oldY) + SIZE);
* The game paddle thread
class Paddle extends Thread {
* Paddle width
public final int WIDTH = mainFrame.getWidth() / 6;
* Paddle height
public final int HEIGHT = mainFrame.getHeight() / 15;
* X position
int x;
* Y position
int y;
* Create a new paddle
public Paddle() {
setUp();
* Initialize starting position
void setUp() {
x = mainFrame.getWidth() / 2 - WIDTH / 2;
y = mainFrame.getHeight() - HEIGHT;
* Loop to run paddlethread, loops until game over
public void run() {
while (!gameOver) {
try {
Thread.sleep(10);
} catch (Exception e) {
return;
* Move paddle right/left
void move(int delta) {
int oldX = x;
int xPos = x + delta;
if (((xPos + WIDTH) <= mainFrame.getWidth())
&& (xPos >= 0)) {
x = xPos;
mainFrame.repaint(Math.min(oldX, x), y,
Math.abs(x-oldX) + WIDTH, HEIGHT);
}

Let me do you a favor. With this, even you don't have JDK installed, you can help your friend.
PaddleBall.java:4: package javax.microedition.lcdui does not exist
import javax.microedition.lcdui.*;
^
PaddleBall.java:5: package javax.microedition.midlet does not exist
import javax.microedition.midlet.*;
^
PaddleBall.java:13: cannot resolve symbol
symbol : class MIDlet
location: class midp.demo.PaddleBall
public class PaddleBall extends MIDlet implements CommandListener {
                                ^
PaddleBall.java:13: cannot resolve symbol
symbol : class CommandListener
location: class midp.demo.PaddleBall
public class PaddleBall extends MIDlet implements CommandListener {
                                                  ^
PaddleBall.java:165: cannot resolve symbol
symbol : class Canvas
location: class midp.demo.PaddleBall.GameFrame
class GameFrame extends Canvas {
                        ^
PaddleBall.java:191: cannot resolve symbol
symbol : class Graphics
location: class midp.demo.PaddleBall.GameFrame
private void clear(Graphics g) {
                   ^
PaddleBall.java:200: cannot resolve symbol
symbol : class Graphics
location: class midp.demo.PaddleBall.GameFrame
public void paint(Graphics g) {
                  ^
PaddleBall.java:38: cannot resolve symbol
symbol : class Form
location: class midp.demo.PaddleBall
private Form titleScreen;
        ^
PaddleBall.java:43: cannot resolve symbol
symbol : class Form
location: class midp.demo.PaddleBall
private Form statsScreen;
        ^
PaddleBall.java:73: cannot resolve symbol
symbol : class Display
location: class midp.demo.PaddleBall
private Display myDisplay;
        ^
PaddleBall.java:130: cannot resolve symbol
symbol : class Command
location: class midp.demo.PaddleBall
public void commandAction(Command c, Displayable d) {
                          ^
PaddleBall.java:130: cannot resolve symbol
symbol : class Displayable
location: class midp.demo.PaddleBall
public void commandAction(Command c, Displayable d) {
                                     ^
PaddleBall.java:77: cannot resolve symbol
symbol : variable Display
location: class midp.demo.PaddleBall
myDisplay = Display.getDisplay(this);
            ^
PaddleBall.java:87: cannot resolve symbol
symbol : class Form
location: class midp.demo.PaddleBall
titleScreen = new Form("Paddle Ball");
                  ^
PaddleBall.java:88: cannot resolve symbol
symbol : class StringItem
location: class midp.demo.PaddleBall
titleScreen.append(new StringItem(null,
                       ^
PaddleBall.java:91: cannot resolve symbol
symbol : class Command
location: class midp.demo.PaddleBall
titleScreen.addCommand(new Command("START", Command.OK, 1));
                           ^
PaddleBall.java:91: cannot resolve symbol
symbol : variable Command
location: class midp.demo.PaddleBall
titleScreen.addCommand(new Command("START", Command.OK, 1));
                                            ^
PaddleBall.java:96: cannot resolve symbol
symbol : class Form
location: class midp.demo.PaddleBall
statsScreen = new Form("Results");
                  ^
PaddleBall.java:98: cannot resolve symbol
symbol : class Command
location: class midp.demo.PaddleBall
statsScreen.addCommand(new Command("AGAIN?", Command.OK, 1));
                           ^
PaddleBall.java:98: cannot resolve symbol
symbol : variable Command
location: class midp.demo.PaddleBall
statsScreen.addCommand(new Command("AGAIN?", Command.OK, 1));
                                             ^
PaddleBall.java:175: cannot resolve symbol
symbol : method getGameAction (int)
location: class midp.demo.PaddleBall.GameFrame
gameAction = getGameAction(keyCode);
             ^
PaddleBall.java:179: cannot resolve symbol
symbol : variable LEFT
location: class midp.demo.PaddleBall.GameFrame
if (gameAction == LEFT) {
                  ^
PaddleBall.java:182: cannot resolve symbol
symbol : variable RIGHT
location: class midp.demo.PaddleBall.GameFrame
} else if (gameAction == RIGHT) {
                         ^
PaddleBall.java:194: cannot resolve symbol
symbol : method getWidth ()
location: class midp.demo.PaddleBall.GameFrame
g.fillRect(0, 0, getWidth(), getHeight());
                 ^
PaddleBall.java:194: cannot resolve symbol
symbol : method getHeight ()
location: class midp.demo.PaddleBall.GameFrame
g.fillRect(0, 0, getWidth(), getHeight());
                             ^
PaddleBall.java:362: cannot resolve symbol
symbol : method getWidth ()
location: class midp.demo.PaddleBall.GameFrame
public final int WIDTH = mainFrame.getWidth() / 6;
                                  ^
PaddleBall.java:367: cannot resolve symbol
symbol : method getHeight ()
location: class midp.demo.PaddleBall.GameFrame
public final int HEIGHT = mainFrame.getHeight() / 15;
                                   ^
PaddleBall.java:229: cannot resolve symbol
symbol : method getHeight ()
location: class midp.demo.PaddleBall.GameFrame
public final int SIZE = mainFrame.getHeight() / 15;
                                 ^
PaddleBall.java:264: cannot resolve symbol
symbol : method getWidth ()
location: class midp.demo.PaddleBall.GameFrame
x = mainFrame.getWidth() / 2;
             ^
PaddleBall.java:265: cannot resolve symbol
symbol : method getHeight ()
location: class midp.demo.PaddleBall.GameFrame
y = mainFrame.getHeight() / 10;
             ^
PaddleBall.java:291: cannot resolve symbol
symbol : method getWidth ()
location: class midp.demo.PaddleBall.GameFrame
if (((xPos+SIZE) <= mainFrame.getWidth())
                             ^
PaddleBall.java:297: package AlertType does not exist
AlertType.WARNING.playSound(myDisplay);
         ^
PaddleBall.java:306: cannot resolve symbol
symbol : method getHeight ()
location: class midp.demo.PaddleBall.GameFrame
(mainFrame.getHeight() - myPaddle.HEIGHT))) {
          ^
PaddleBall.java:310: cannot resolve symbol
symbol : method getHeight ()
location: class midp.demo.PaddleBall.GameFrame
(mainFrame.getHeight() - myPaddle.HEIGHT)) {
          ^
PaddleBall.java:318: package AlertType does not exist
AlertType.INFO.playSound(myDisplay);
         ^
PaddleBall.java:332: cannot resolve symbol
symbol : class StringItem
location: class midp.demo.PaddleBall.Ball
statsScreen.append(new StringItem("Game " +
                       ^
PaddleBall.java:345: package AlertType does not exist
AlertType.WARNING.playSound(myDisplay);
         ^
PaddleBall.java:347: cannot resolve symbol
symbol : method repaint (int,int,int,int)
location: class midp.demo.PaddleBall.GameFrame
mainFrame.repaint(Math.min(oldX, x), Math.min(oldY, y),
         ^
PaddleBall.java:391: cannot resolve symbol
symbol : method getWidth ()
location: class midp.demo.PaddleBall.GameFrame
x = mainFrame.getWidth() / 2 - WIDTH / 2;
             ^
PaddleBall.java:392: cannot resolve symbol
symbol : method getHeight ()
location: class midp.demo.PaddleBall.GameFrame
y = mainFrame.getHeight() - HEIGHT;
             ^
PaddleBall.java:417: cannot resolve symbol
symbol : method getWidth ()
location: class midp.demo.PaddleBall.GameFrame
if (((xPos + WIDTH) <= mainFrame.getWidth())
                                ^
PaddleBall.java:421: cannot resolve symbol
symbol : method repaint (int,int,int,int)
location: class midp.demo.PaddleBall.GameFrame
mainFrame.repaint(Math.min(oldX, x), y,
         ^
42 errors

Please take a look? (Pong)

Hello :) My friend is doing his thesis & he's stuck with this program. Apparently it's not compiling. Unfortunately I don't have Java installed on this comp (in work) so I'm not much use but I was hoping someone here could point him in the right direction. Here goes...
Description: Basic paddle ball type game.
This example midlet demonstrates how to use threads and the Canvas class. It implements
a simple paddle ball type game. It demonstrates how to use a clipping region to implement
graphics more effeciently.
It should animate at a constant speed on all phones, although it may appear
jerky on devices with very restricted processing resources.
@created den 21 mars 2002
COPYRIGHT All rights reserved Sony Ericsson Mobile Communications AB 2003.
The software is the copyrighted work of Sony Ericsson Mobile Communications AB.
The use of the software is subject to the terms of the end-user license
agreement which accompanies or is included with the software. The software is
provided "as is" and Sony Ericsson specifically disclaim any warranty or
condition whatsoever regarding merchantability or fitness for a specific
purpose, title or non-infringement. No warranty of any kind is made in
relation to the condition, suitability, availability, accuracy, reliability,
merchantability and/or non-infringement of the software provided herein.
package midp.demo;
import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
* Basic Ball and Paddle game. Use arrow keys to move paddle.
* Demonstrates multi-threading, animation, event handling.
* @see MIDlet
public class PaddleBall extends MIDlet implements CommandListener {
* Constant for white color
private static final int COLOR_WHITE = 0xFFFFFF;
* Constant for black color
private static final int COLOR_BLACK = 0x000000;
* The game speed (in milliseconds)
private final int GAME_SPEED = 5;
* The main game screen
private GameFrame mainFrame;
* The title screen
private Form titleScreen;
* The results screen
private Form statsScreen;
* The number of milliseconds the user has been playing this game
private long elapsedTime;
* The ball object for this game
private Ball myBall;
* The paddle object for this game
private Paddle myPaddle;
* True if game has not started or player lost
private boolean gameOver = true;
* How many games have been played
private int numGames;
* Reference to Display
private Display myDisplay;
public PaddleBall() {
myDisplay = Display.getDisplay(this);
* Create main game screen
mainFrame = new GameFrame();
* Create title screen
titleScreen = new Form("Paddle Ball");
titleScreen.append(new StringItem(null,
"The classic arcade game, now on your mobile device!"));
titleScreen.setCommandListener(this);
titleScreen.addCommand(new Command("START", Command.OK, 1));
* Create results screen
statsScreen = new Form("Results");
statsScreen.setCommandListener(PaddleBall.this);
statsScreen.addCommand(new Command("AGAIN?", Command.OK, 1));
* Begin the application, show its frame
protected void startApp() {
myDisplay.setCurrent(titleScreen);
* Application is being terminated, kill threads
protected void pauseApp() {
gameOver = true;
myBall = null;
myPaddle = null;
* Clean up application
protected void destroyApp(boolean unconditional) {
gameOver = true;
* Start the game
public void commandAction(Command c, Displayable d) {
* Create ball and paddle threads
myBall = new Ball();
myPaddle = new Paddle();
* Get the starting time
elapsedTime = System.currentTimeMillis();
* Set the initial ball and paddle positions
myBall.setUp();
myPaddle.setUp();
* Set the screen
myDisplay.setCurrent(mainFrame);
* Start the thread
gameOver = false;
myBall.start();
myPaddle.start();
* The main Screen for this game
class GameFrame extends Canvas {
* Canvas receives all key events
public void keyPressed(int keyCode) {
int gameAction = 0;
try {
gameAction = getGameAction(keyCode);
} catch (Exception e) {
if (gameAction == LEFT) {
myPaddle.move(-2 * GAME_SPEED);
} else if (gameAction == RIGHT) {
myPaddle.move(2 * GAME_SPEED);
return;
* Clear the game screen
private void clear(Graphics g) {
g.setColor(0xFFFFFF);
g.fillRect(0, 0, getWidth(), getHeight());
* Paint the game screen
public void paint(Graphics g) {
synchronized (g) {
* Clear the screen
clear(g);
g.setColor(0x000000);
* Paint the ball and paddle
g.fillRect(myPaddle.x, myPaddle.y, myPaddle.WIDTH,
myPaddle.HEIGHT);
g.fillArc(myBall.x, myBall.y, myBall.SIZE,
myBall.SIZE, 0, 360);
* The ball thread
class Ball extends Thread {
* The ball diameter
public final int SIZE = mainFrame.getHeight() / 15;
* The sign of the x component of the velocity
private int xDir = 1;
* The sign of the y component of the velocity
private int yDir = 1;
* X position of ball
int x;
* Y position of ball
int y;
* Create a ball
public Ball() {
setUp();
* Set starting position
void setUp() {
x = mainFrame.getWidth() / 2;
y = mainFrame.getHeight() / 10;
* Loop to run thread, loops until game over
public void run() {
while (!gameOver) {
* Sleep for animation delay
try {
Thread.sleep(150 - 10 * GAME_SPEED);
} catch (Exception e) {
return;
int oldX = x;
int oldY = y;
* Recalculate x position
int xPos = x + xDir * GAME_SPEED;
if (((xPos+SIZE) <= mainFrame.getWidth())
&& (xPos >= 0)) {
x = xPos;
} else {
xDir *= -1;
AlertType.WARNING.playSound(myDisplay);
* Recalculate y position
int yPos = y + yDir * GAME_SPEED;
if ((yPos >= 0) &&
((yPos + SIZE) <=
(mainFrame.getHeight() - myPaddle.HEIGHT))) {
y = yPos;
} else if ((yPos + SIZE) >
(mainFrame.getHeight() - myPaddle.HEIGHT)) {
* Bounce off paddle
if ((xPos <= (myPaddle.x + myPaddle.WIDTH))
&& ((xPos + SIZE) >= myPaddle.x)) {
yDir *= -1;
AlertType.INFO.playSound(myDisplay);
* Player loses
} else {
gameOver = true;
* Get statistic information
elapsedTime = System.currentTimeMillis()
- elapsedTime;
numGames++;
statsScreen.append(new StringItem("Game " +
numGames + " over", "Time: " +
(elapsedTime/1000) + " seconds"));
* Show the statistics screen
myDisplay.setCurrent(statsScreen);
return;
} else if (yPos < 0) {
yDir *= -1;
AlertType.WARNING.playSound(myDisplay);
mainFrame.repaint(Math.min(oldX, x), Math.min(oldY, y),
Math.abs(x-oldX) + SIZE,
Math.abs(y-oldY) + SIZE);
* The game paddle thread
class Paddle extends Thread {
* Paddle width
public final int WIDTH = mainFrame.getWidth() / 6;
* Paddle height
public final int HEIGHT = mainFrame.getHeight() / 15;
* X position
int x;
* Y position
int y;
* Create a new paddle
public Paddle() {
setUp();
* Initialize starting position
void setUp() {
x = mainFrame.getWidth() / 2 - WIDTH / 2;
y = mainFrame.getHeight() - HEIGHT;
* Loop to run paddlethread, loops until game over
public void run() {
while (!gameOver) {
try {
Thread.sleep(10);
} catch (Exception e) {
return;
* Move paddle right/left
void move(int delta) {
int oldX = x;
int xPos = x + delta;
if (((xPos + WIDTH) <= mainFrame.getWidth())
&& (xPos >= 0)) {
x = xPos;
mainFrame.repaint(Math.min(oldX, x), y,
Math.abs(x-oldX) + WIDTH, HEIGHT);
}

Cross-post
http://forum.java.sun.com/thread.jspa?threadID=5160243&tstart=0

Code for NSImageView

Using Project Builder, I have made an appleScript application that selects photos with a browser then tells Photoshop to make a series of changes to them using actions. I would like to have an NSImageView as part of the interface window but it seems to need code for many handlers. Is there a sample of workable code for these handlers anywhere? Thanks...

Hi HerbA
Some of this code may be of use to you, it's plucked straight out of one of my projects that im working on, it works fine for me in my project. (im open to improvement suggestions also).
global the_image
on clicked theObject
--CLOSES THE VIEWER PANEL--
if name of theObject is "cancel" then
delete image of image view "image" of window "VIEWER"
delete contents of text field "pathto" of (window "VIEWER")
close panel (window "VIEWER")
end if
--OPENS THE VIEWER PANEL--
if name of theObject is "getviewer" then
display (window "VIEWER") attached to window "MAIN"
end if
--DELET IMAGE FROM IMAGE VIEWER --
if name of theObject is "delete" then
delete image of image view "image" of window "VIEWER"
delete contents of text field "pathto" of (window "VIEWER")
end if
--RUNS THE BARBER POLE or spinning ICON--
tell window "VIEWER"
set indeterminate of progress indicator "bar_Progress" to true
set uses threaded animation of progress indicator "bar_Progress" to true
set animation delay of progress indicator "bar_Progress" to 1
tell progress indicator "bar_Progress" to start
end tell
--GETS THE IMAGE AND OPENS THE IMAGE IN ITS APPLICATION--
tell window of theObject
if name of theObject is "userpick" then tell me to get_picture()
if name of theObject is "openfile" then tell me to open_picture()
end tell
end clicked
on get_picture()
set the_image to (choose file without invisibles)
set new_image to load image the_image
set image of image view "image" of window "VIEWER" to new_image
set text color of text field "pathto" of window "VIEWER" to {0, 0, 65535}
set contents of text field "pathto" of window "VIEWER" to the_image as string
end get_picture
on open_picture()
if content of text field "pathto" of window "VIEWER" is not "" then
tell application "Finder" to open the_image
else
display dialog "Please use - Select item to view - first." with icon caution
end if
end open_picture
tell progress indicator "bar_Progress" to stop
end clicked
hope this helps
Budgie

Question: Design help Epub FXL

Hello friends.
I'm building a fixed layout epub with the newest version of indesign. So far it's pretty amazing, but there are a couple of things I would like to do, but don't know how. Any help would be GREATLY appreciated.
1. I'm adding a video to some spreads. They autoplay on page load and I've added a 2 second appear animation to avoid the reader seeing the load and play button on the video player before it actually starts playing. Can I add another event to the same element -the video- on the same spread? For instance a disappear animation delayed five seconds? (so the video appears, plays and disappears again)
2. Can I make audio play across several spreads (and not be cut off on page turn)?
All the best,
//Thue

So, I figured the first question out myself. It's resolved here.
The second question remains:
Can I make an audio-clip continue after page turn?
I found the "Stop on page turn" - but it doesn't seem to work. It's not clicked and the music still stops on page turn. I've tried both options, and it doesn't change anything.

Don't understand the code, about boucing ball

this is a program intends to create a ball and let the ball bouncing until it reaches the right side of the console. It's in the stanford cs106a course.
I don't the part：
// assume bounce will move ball an amount above the
// floor equal to the amount it would have dropped
// below the floor.
double diff = ball.getY() - (getHeight() - DIAM_BALL);
ball.move(0, -2 * diff);does the ball actually reaches the bottom of the console, and them let the ball moves back upwards with the distance 2diff?
thanks a lot!
beside, I'm new in this forum, how to let the code show in the code mode? Cause it seems hard to read right now.
Here is the whole program:
* File: BouncingBall.java
* This program graphically simulates a bouncing ball.
import acm.program.*;
import acm.graphics.*;
public class BouncingBall extends GraphicsProgram {
/** Size (diameter) of the ball */
private static final int DIAM_BALL = 30;
/** Amount Y velocity is increased each cycle as a
* result of gravity */
private static final double GRAVITY = 3;
/** Animation delay or pause time between ball moves */
private static final int DELAY = 50;
/** Initial X and Y location of ball */
private static final double X_START = DIAM_BALL / 2;
private static final double Y_START = 100;
/** X Velocity */
private static final double X_VEL = 5;
/** Amount Y Velocity is reduced when it bounces */
private static final double BOUNCE_REDUCE = 0.9;
/** Starting X and Y Velocties */
private double xVel = X_VEL;
private double yVel = 0.0;
/* private instance variable */
private GOval ball;
public void run() {
setup();
// Simulation ends when ball goes off right hand
// end of screen
while (ball.getX() < getWidth()) {
moveBall();
checkForCollision();
pause(DELAY);
/** Create and place ball. */
private void setup() {
ball = new GOval(X_START, Y_START, DIAM_BALL, DIAM_BALL);
ball.setFilled(true);
add(ball);
/** Update and move ball */
private void moveBall() {
// increase yVelocity due to gravity on each cycle
yVel += GRAVITY;
ball.move(xVel,yVel);
/** Determine if collision with floor, update velocities
* and location as appropriate. */
private void checkForCollision() {
// determine if ball has dropped below the floor
if (ball.getY() > getHeight() - DIAM_BALL) {
// change ball's Y velocity to now bounce upwards
yVel = -yVel * BOUNCE_REDUCE;
// assume bounce will move ball an amount above the
// floor equal to the amount it would have dropped
// below the floor.
double diff = ball.getY() - (getHeight() - DIAM_BALL);
ball.move(0, -2 * diff);
}Edited by: 967521 on 2012-10-24 下午7:11
Edited by: 967521 on 2012-10-25 上午7:43
Edited by: Melissa13 on 2012-10-26 上午7:21

Put your code between tags and it'll show correctly (you should edit the post now).

Making titles longer?

I dropped a title template on my timeline and have edited the way I want it, and have added an animation that makes the text appear from off screen. My problem is I need to make the text appear longer on the screen at the end.
If I drag the right end to make it longer, or use time stretch to expand it, it does change the overall length of the title, but it also slows the animation, delaying when the title finishes appearing.
Is it possible to change the duration of a title WITHOUT changing the speed of the text animation?
Bruce.

Thanks Peter but I have a question about that. It would take too long to recreate the title from scratch for a second instance, so I'm trying to use copy/paste to create the second instance and then remove the text animation from the second one.
I can copy the first one to the clipboard, and then paste, but the 2 titles are now linked somehow. The second one is not an independent copy. If I remove the text animation from the second one, the first one loses its text animation too.
How can I copy a title without the copies remaining linked to the original?
Bruce.

Animation Delay`

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