Applet Game Programming - player movement

HI Java Experts,
I have a very simple question applet game programming - jdk 1.02.
Let's say you have a player on the applet window. He can move right and left.
Naturally you have an image representing the player. When the player moves left you present an image loop with him running left. And vice versa for running right.
Of course when he stops moving you just want to show a still image.
What do you guys feel is the best technique for that situation ?
Stephen

Hi Thanks for the advice.
I'm under the impression that if I used jdk1.4
everybody who wanted to play the game would have to go
through the trouble of downloading something . If
that is so, then i would like to stick with 1.02 to
have the widest possible audience.Use Java Web Start to deploy it as an application instead of an Applet. If your program is really cool, people will download the JDK 1.4 to use it. Then we will have more java users in the world :)
By the way i have a URL perhaps someone could look > at the source code and give additional suggestions
you can make sonic the hedge hog run and jump
http://www.swebdev.com/Adventure.html
That code has some good points. I like the nice object oriented flow of it. However, the way he sets up the Thread is all wrong. He uses yield and sleep, you would want to set up this using wait() and notifyAll() calls if you want to make it more interesting.
Right now i'm trying to address the issue of how to
reverse the image for when the player is running the
opposite way -- ? perhaps a separate thread in 1.02
might be an answer? I would be glad to hear all kinds
of suggestions on the sample code seen thereYou shouldn't need a separate thread just to reverse the image. If your little guy is already in his own thread, just switch the image that is displayed when the player hits the opposite direction key.
Think of threads like puppets, and you are the puppet master. Your little guys is a puppet, so he should be in his own thread. You can make him do whatever you want from your thread (the master) by pulling strings (changing globals, and message passing)
Wow... Thats a really good analogy... I just thought that up :)

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Hi people. Iam quite new to java and currently learning stuff about how to program java games in an applet. So iam looking for a partner to start a little game/project together and hopefully we can learn stuff of each other and get a half decent game at the end aswell. I only really have 1 requirement.
Please know atleast the fundementals of applet game programming
Other information
Age : 16
Location : UnitedKingdom
Chat : MSN Messenger
Please get in contact with me through e-mail or MSN Chat. e-mail is : [email protected]
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>>
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how to "hello the world" so I'll save you that work.
In Flash (Note: I'm using CS3 but I doubt this part of the
menu has changed that much)
1) File -> New -> ActionScript File
2) Paste in the following:
package junkdir {
import flash.display.Sprite;
public class junktest extends Sprite {
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3) Save as some_folder/junkdir/junktest // obviously create
new folder 'junkdir' during this process
4) File -> New -> Flash File (Action Script 3.0)
5) In the properties field labeled 'document class' type in
junkdir.junktest // THIS WAS THE OBSCURE PART
If the properties field did not automatically open then
manually open with: Window -> Properties -> Properties
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7) Control -> Test Movie
"Hello World" appears in the Output Window. (This also can be
opened manually)
Read whatever Adobe online docs gets you involved quickly, I
like the display objects just for a quick visual high. Most code
will cut and paste into this 'junk' framework.
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import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.lang.*;
import sun.audio.*; //import the sun.audio package
import java.io.*;
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SimonButton[] navb = new SimonButton[2];
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int arraycount=0;
int whichbutton=0;
AudioClip snd1;
AudioClip snd2;
AudioClip snd3;
AudioClip snd4;
AudioClip right;
AudioClip wrong;
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snd4=getAudioClip(getDocumentBase(), "three.wav");
snd3=getAudioClip(getDocumentBase(), "two.wav");
snd2=getAudioClip(getDocumentBase(), "one.wav");
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simonb[count] = new SimonButton(Integer.toString(count));
simonb[count].ColorButton(Color.black );
simonb[count].ColorFont(Color.white);
simonb[count].addActionListener(this);
add(simonb[count]);
for(int count=0; count<2;count++)
if(count==0)
navb[count] = new SimonButton("<");
if(count==1)
navb[count] = new SimonButton(">");
navb[count].addActionListener(this);
add(navb[count]);
gob.addActionListener(this) ;
add(gob);
public void paint(Graphics g) {
g.drawString ("Simon Sez: Choose your level using arrow buttons and click go to play.Have FUN!!!",10,50);
public void actionPerformed(ActionEvent event) {
//test.setText("Button number is " + buttonCaption);
String command = event.getActionCommand();
     //if (command.equals("Push")){
if (command == "GO")
playmode=3;
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if (command == "<" )
if(levelc==1);
else
levelc--;
level.setText("Level: "+Integer.toString(levelc) );
if (command == ">" )
if(levelc==10);
else
levelc++;
level.setText("Level: "+Integer.toString(levelc) ) ;
break;
case 2: //This is play mode
//This is where it wont get past my if statement???????????????????????????
if ( "0"==command)
     {     level.setText("WORKIng"+command);
simonb[0].ColorFont(Color.red);
for(int count=0;count<100000000;count++)
          snd1.play();
simonb[0].ColorFont(Color.white );
whichbutton=1;
if((levelarray[arraycount]==whichbutton))
if(arraycount+1==levelc)
{ right.play();
playmode=1;
break;
arraycount++;
else
{   wrong.play();
arraycount=0;
if ("1" == command)
simonb[1].ColorFont(Color.yellow);
for(int count=0;count<100000000;count++)
          snd2.play();
simonb[1].ColorFont(Color.white );
whichbutton=2;
if((levelarray[arraycount]==whichbutton))
if(arraycount+1==levelc)
{ right.play();
playmode=1;
break;
arraycount++;
else
{   wrong.play();
arraycount=0;
if (command == "2" )
simonb[2].ColorFont(Color.blue);
for(int count=0;count<100000000;count++)
          snd3.play();
simonb[2].ColorFont(Color.white );
whichbutton=3;
if((levelarray[arraycount]==whichbutton))
if(arraycount+1==levelc)
{ right.play();
playmode=1;
break;
arraycount++;
else
{   wrong.play();
arraycount=0;
if (command == "3" )
simonb[3].ColorFont(Color.pink);
for(int count=0;count<100000000;count++)
          snd4.play();
simonb[3].ColorFont(Color.white );
whichbutton=4;
if((levelarray[arraycount]==whichbutton))
if(arraycount+1==levelc)
{ right.play();
playmode=1;
break;
arraycount++;
else
{   wrong.play();
arraycount=0;
level.setText(command ) ;
break;
case 3: //This is generate mode
arraycount=0;
whichbutton=0;
playmode=2;
for(int count=0;count<levelc;count++)
levelarray[count]=1+ (int) (Math.random() *4);
level.setText(Integer.toString(levelarray[count]) );
for(int count=0;count<levelc;count++)
if(levelarray[count]==1)
simonb[0].ColorFont(Color.red);
for(int countr=0;countr<100000000;countr++)
          snd1.play();
simonb[0].ColorFont(Color.white );
if(levelarray[count]==2)
simonb[1].ColorFont(Color.yellow);
for(int county=0;county<100000000;county++)
snd2.play();
simonb[1].ColorFont(Color.white );
if(levelarray[count]==3)
simonb[2].ColorFont(Color.blue);
for(int countb=0;countb<100000000;countb++)
          snd3.play();
simonb[2].ColorFont(Color.white );
if(levelarray[count]==4)
simonb[3].ColorFont(Color.pink);
for(int countp=0;countp<100000000;countp++)
          snd4.play();
simonb[3].ColorFont(Color.white );
playmode=2;
} //end of for loop
playmode=2;
break;
     //Get Applet information
public String getAppletInfo() {
          return "Applet Information";
     //Get parameter info
public String[][] getParameterInfo() {
          return null;
import java.awt.*;
import java.awt.event.*;
public class SimonButton extends Button implements ActionListener{
public SimonButton(String label) {
this.setLabel(label) ;
public void actionPerformed(ActionEvent event) {
public void ColorButton(Color color){
this.setBackground(color);
public void ColorFont(Color color) {
this.setForeground(color );
public void paint(Graphics g) {

you need to replace all occurrances in your code of:
if(".." == command)....
with:
if("..".equalsIngnoreCase(command))...
When doing string comparison, the equality operator doesn't work. Use the provided method instead

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First of all I wanted to say that I like the game but I still think there is room to improve.
To begin with yes, I think you've got way to many circles going in the start.
If you had maybe 7 circles with higher speed I would think it more of a challenge or do as turingpest says and ramp up the number of circles.
When I click the mouse button everything stops for a maybe 250 msec and then jumps to a new location, while it makes it more difficult I though it mainly annoying.
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I presume this is about how to have a game run in the background on the server, outside of the web requests the user made to get to the game in the first place.
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Well that's strange because people who have downloaded it from Youtube and played locally (including me) don't find it choppy at all. The video only becomes choppy when playing on Youtube, and that's only for some viewers. People either find it choppy or completely smooth.
http://forum.videohelp.com/threads/363688-Youtube-video-choppy-during-camera-movement-for- some-viewers?p=2314056
http://forums.afterdawn.com/t.cfm/f-4/youtube_video_choppy_during_playback_for_some_viewer s-973920/
http://forum.videohelp.com/threads/363096-Embedded-video-smoother-than-actual-Youtube?p=23 08460#post2308460

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<edited>
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Applet Game Programming - player movement

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