ANButton
/*
Please feel free to use and improve this code. It would not be here but for the
freely given help of others. I would love to see your improvements.
Elijah.
elijah@bga.com
http://www.realtime.net/~elijah/
The same things are valid for me.
Florian.
hars@math.uni-hamburg.de
http://www.math.uni-hamburg.de/~fm5a014 */
import java.awt.* ;
//import java.awt.Graphics;
//import java.awt.Event;
//import java.awt.Image;
import java.awt.MediaTracker;
import java.net.URL;
import java.net.MalformedURLException;
import java.lang.InterruptedException;
import java.applet.Applet;
public class ANButton extends java.applet.Applet implements Runnable{
private MediaTracker tracker;
private Image buf;
private Image bg;
private Image img[] = new Image[10];
private int X,Y;
private Graphics offscreen;
private Dimension d;
private boolean onButt = false;
private boolean pressedButt = false;
private boolean three_state = true;
private boolean userPause = true;
private int onIs = 0;
private int animImg = 3;
private int maxImg = 3;
private int pause = 200;
private URL clickDest;
private String dest;
private String destDefault = "http://www.math.uni-hamburg.de/math/ign/";
/**
* The thread animating the images.
*/
private Thread engine = null;
/****************************STATE CHANGES*************************************/
public void init() {
String istr;
d = size();
buf= createImage(d.width,d.height);
offscreen = buf.getGraphics();
int i = 0;
boolean finished = false;
tracker = new MediaTracker(this);
while (!finished && i<10) {
istr = getParameter("image"+i);
if (istr == null){
if(i>0){
finished = true;
}else{
three_state = false;
onIs = 3;
}
}else{
if (i==0) {
three_state = true;
}
showStatus("Loading image "+istr+".");
img[i] = getImage(getCodeBase(),istr);
tracker.addImage(img[i], 0);
try {
tracker.waitForAll();
} catch (InterruptedException e) {
System.out.println("Error waiting for image"+i+" to load");
}//end catch
}//end if
i++;
}//end while
maxImg = i-2;
if (maxImg < 3) {
System.out.println("Need at least images 1 to 3: Check Applet Tag.");
for (i = maxImg + 1; i < 4 ; i++) {
img[i]=img[1];
}
maxImg = 3;
}
istr = getParameter("x");
X = (istr != null) ? Integer.parseInt(istr) : 0;
istr = getParameter("y");
Y = (istr != null) ? Integer.parseInt(istr) : 0;
istr = getParameter("pause");
pause = (istr != null) ? Integer.parseInt(istr) : 200;
istr = getParameter("dest");
dest = (istr != null) ? istr : destDefault;
try{
clickDest = new URL(dest);
}catch(MalformedURLException mal){
System.out.println("Malformed URL: Check Applet Tag.");
}
}//end init
public void start(){
if (engine == null && !userPause) {
engine = new Thread(this);
engine.start();
}
}//end start
public void stop(){
if (engine != null && engine.isAlive()) {
engine.stop();
}
engine = null;
}//end stop
public void destroy(){
}//end destroy
/****************************END STATE CHANGES********************************/
/*******************************EVENTS****************************************/
public boolean mouseDown(Event e, int x, int y){
if (engine != null && engine.isAlive()) {
userPause = true;
engine.suspend();
stopPlaying();
}
pressedButt = true;
repaint();
return(true);
}//end mouseDown
public boolean mouseUp(Event e, int x, int y){
if(pressedButt && onButt){
pressedButt = false;
repaint();
getAppletContext().showDocument(clickDest);
}else{
pressedButt = false;
repaint();
}
return(true);
}//end mouseUp
public boolean mouseEnter(Event e, int x, int y){
onButt = true;
userPause = false;
if (engine != null && engine.isAlive()) {
engine.resume();
startPlaying();
} else {
engine = new Thread(this);
engine.start();
startPlaying();
}
repaint();
showStatus(dest);
return(true);
}//end mouseEnter
public boolean mouseExit(Event e, int x, int y){
onButt = false;
userPause= true;
if (engine != null && engine.isAlive()) {
engine.suspend();
stopPlaying();
}
repaint();
showStatus("");
return(true);
}//end mouseExit
/*******************************END EVENTS*************************************/
/*******************************METHODS****************************************/
void startPlaying() {
}
void stopPlaying() {
}
public void run() {
Thread me = Thread.currentThread();
me.setPriority(Thread.MIN_PRIORITY);
while (engine == me) {
try {
Thread.sleep(pause);
} catch (InterruptedException e) {
// Should we do anything?
}
animImg += 1;
if (animImg > maxImg) {
animImg=3;
}
repaint();
}
}
public void update(Graphics g){
if(!onButt) {
if(three_state) {
onIs = 0;
} else {
onIs = 3;
}
}
else if (onButt && !pressedButt) {
onIs = 3;
}
else {
onIs = 2;
}
paint(g);
}//end update
public void paint(Graphics g){
if (offscreen != null) {
paintApplet(offscreen);
g.drawImage(buf, 0, 0, this);
} else {
paintApplet(g);
}
}//end paint
public void paintApplet(Graphics g) {
int pic;
pic = onIs;
if (onIs == 3) {
pic = animImg;
}
g.drawImage(img[1],0,0,null);
g.drawImage(img[pic],X,Y,null);
}
/*****************************END METHODS**************************************/
}//end class ANButton
Back to the ANButton applet page
New on the Java Boutique:
New Review:
Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling
API boasts simplicity, ease-of-integration, a well-rounded feature
set, and it's free!
New Applet:
Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA
sequences into three useful formats.
Elsewhere on internet.com:
WebDeveloper Java
Lots of Java information on webdeveloper.com
WDVL Java
Thorough Java resource at the Web Developer's Virtual Library.
ScriptSearch Java
Hundreds of free Java code files to download.
jGuru: Your View of the Java Universe
Customizable portal with online training, FAQs, regular news updates, and tutorials.
|
