AnimNav
/*
AnimNav.java
Version 1.0.0
Written by Elijah Dean Meeker 1/4/96
Clicking it navagates to the given URL. It
uses off-screen buffering to avoid flicker. Here is a valid applet tags:
[Optional params are in brackets][Second brackets contain defaults]
<APPLET
codebase="classes"
CODE="AnimNav.class" WIDTH=75 HEIGHT=75> SIZE of button images
[<PARAM NAME="spriteX" VALUE="10">] LEFT pos. to draw sub-images[0]
[<PARAM NAME="spriteY" VALUE="10">] TOP pos. to draw sub-images [0]
[<PARAM NAME="sleeptime" VALUE="500">] TIME between images[autorun off]
<PARAM NAME="imageCount" VALUE="8"> Image Count
<PARAM NAME="translation" VALUE="0|0|1|1|2|2|3|3"> Which URL goes with which frame of animation
<PARAM NAME="URLcount" VALUE="4"> URL count
<PARAM NAME="dest0" VALUE="http://www.realtime.net/~elijah/"> URL to navigate to
<PARAM NAME="dest1" VALUE="http://www.mel.dit.csiro.au/~brendan/">URL to navigate to
<PARAM NAME="dest2" VALUE="http://198.3.117.222"> URL to navigate to
<PARAM NAME="dest3" VALUE="http://www.sun.com/"> URL to navigate to
[<PARAM NAME="desc0" VALUE="Homepage of Elijah Dean Meeker">] URL description
[<PARAM NAME="desc1" VALUE="Homepage of Brendan Hills">] URL description
[<PARAM NAME="desc2" VALUE="BreakFast Cereal Hall Of Fame">] URL description
[<PARAM NAME="desc3" VALUE="Sun Microsystems">] URL description
[<PARAM NAME="target0" VALUE="_jmainview">] target window for URL[_parent]
[<PARAM NAME="background" VALUE="images/cub_bg.jpg"> ]BACKGROUND image(offset from codebase)
<PARAM NAME="prefix" VALUE="images/nav"> Prefix of images(offset from codebase)
[<PARAM NAME="imagetype" VALUE="jpg">] Image type-WITHOUT '.'[jpg]
</APPLET>
Please feel free to 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/
*/
import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.Dimension;
import java.awt.Event;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.lang.InterruptedException;
import java.net.MalformedURLException;
import java.net.URL;
/******************************************************************************/
/**************************AnimNav.class***************************************/
public class AnimNav extends java.applet.Applet {
//Graphics
MediaTracker tracker;
Dimension d; //for sizing offscreen buffer
Graphics offscreen;
Image buf;
Image bg; //background image
Image img[];//array of sprite images
//AutoRun class
NavAutoRun autoRun;
int spriteX,spriteY;//sprite offset on background
int imageCount; //total number of sprite images
int oldx = 0; //tested in mouseDrag
int downx=0; //tested in mouseUp
public int frame = 0; //current frame of animation
public int URLcount=0;
boolean bgP=true; //background image loaded flag
boolean autorunP=false; //autorun setup flag
URL URLdest[]; //list of URLs
String URLdescription[]; //URLdescriptions
String targetWindow[];
int translate[]; //Which URLs go with which frames of the animation
/****************************STATE CHANGES*************************************/
public void init(){
String str;
String imageType;
//offscreen buffer
//System.out.println("offscreen buffer");
d = size();
buf= createImage(d.width,d.height);
offscreen = buf.getGraphics();
//MediaTracker
//System.out.println("MediaTracker");
tracker = new MediaTracker(this);
/************************LOAD spriteX****************************/
str =getParameter("spritex");
if(str== null){
spriteX=0;
}else{
spriteX=Integer.parseInt(str);
}
/************************LOAD spriteY****************************/
str =getParameter("spritey");
if(str== null){
spriteY=0;
}else{
spriteY=Integer.parseInt(str);
}
/*********************LOAD NavAutoRun init************************/
str =getParameter("sleeptime");
if(str!= null){
autorunP=true;
autoRun=new NavAutoRun(this,Integer.parseInt(str));
}
/************************LOAD urlcount**************************/
//System.out.println("URLdest");
str= getParameter("urlcount");
if (str == null){
System.out.println
("Error Loading: urlcount, Not Optional");
}else{
URLcount= Integer.parseInt(str);
URLdescription=new String[URLcount];
targetWindow=new String[URLcount];
URLdest=new URL[URLcount];
}//ned if
/************************LOAD URLs**************************/
//System.out.println("URLs");
for(int c=0;c<URLcount;c++){
URLdescription[c]= getParameter("dest"+c);
try{
if (URLdescription[c] != null) //this is here for development
URLdest[c] = new URL(URLdescription[c]);
}catch(MalformedURLException mal){
System.out.println("Malformed URL: Check Applet Tag.");
}
}//end for
/************************LOAD URL Descriptions*********************/
for(int c=0;c<URLcount;c++){
str= getParameter("desc"+c);
if (str != null){
URLdescription[c]=str;
}
}//end for
/************************LOAD URL targetWindow*********************/
for(int c=0;c<URLcount;c++){
str= getParameter("target"+c);
if (str == null){
targetWindow[c]=" _parent";
}else{
targetWindow[c]=str;
}
}//end for
/************************LOAD imageCount**************************/
//System.out.println("imageCount");
str =getParameter("imagecount");
if (str == null){
System.out.println
("Error getting Parameter: imagecount, Not Optional.");
}else{
imageCount= Integer.parseInt(str);
img = new Image[imageCount];
}
/************************LOAD translate[]*************************/
str = getParameter("translation");
if (str == null){
System.out.println
("Error getting Parameter: translation, Not Optional.");
}else{
translate=new int[imageCount];
int index=0;
for (int i = 0; i < str.length(); ) {
if (index >= imageCount) break;
int next=str.indexOf('|', i);
if (next == -1) next = str.length();
if (i != next) {
translate[index]=Integer.parseInt(str.substring(i, next));
index++;
}//end if
i = next + 1;
}//end for
}//end if str==null
/*
//this would also work for above
StringTokenizer st = new StringTokenizer(s,"|");
while (st.hasMoreTokens()) {
translate[index]=Integer.parseInt(st.nextToken());
index++;
}
*/
/************************LOAD imagetype**************************/
//System.out.println("imagetype");
str = getParameter("imagetype");
if (str == null){
imageType="jpg";
}else{
imageType=str;
}//end if
/************************LOAD background image**************************/
//System.out.println("background");
str = getParameter("background");
if (str == null){
bgP=false; //not using background image
spriteX=0;spriteY=0;
}else{
showStatus("Loading Background Image");
bg = getImage(getCodeBase(),str);
tracker.addImage(bg, 0);
try {
tracker.waitForAll();
} catch (InterruptedException e) {
System.out.println("Error waiting for Background image to load.");
}//end catch
showStatus("");
}//end if
/************************LOAD animation images*********************/
//System.out.println("Sprites");
str = getParameter("prefix");
if (str == null){
System.out.println
("Error Loading image: "+str+", Not Optional");
}else{
for (int i = 0; i < imageCount; i++) {
showStatus("AnimNav Loading Image :"+(i+1)+ " of " + imageCount);
img[i] = getImage(getCodeBase(),str+i+"."+imageType);
tracker.addImage(img[i], 1);
try {
tracker.waitForAll();
} catch (InterruptedException e) {
System.out.println("Error waiting for image"+i+" to load");
}//end catch
showStatus("");
}//end for
}//end if str == null
}//end init
/******************************************************************************/
public void start(){
if(autorunP==true)autoRun.start();
frame=downx=oldx=0;
repaint();
}//end start
/******************************************************************************/
public void stop(){
if(autorunP==true)autoRun.stop();
}//end stop
/******************************************************************************/
public void destroy(){
}//end destroy
/****************************END STATE CHANGES********************************/
/*******************************EVENTS****************************************/
public boolean mouseDown(Event e, int x, int y){
downx=oldx=x;
return(true);
}//end mouseDown
/******************************************************************************/
public boolean mouseUp(Event e, int x, int y){
if(downx<x+2 && downx>x-2)//set in mouseDown
getAppletContext().showDocument(URLdest[translate[frame]],targetWindow[translate[frame]]);
return(true);
}//end mouseUp
/******************************************************************************/
public boolean mouseEnter(Event e, int x, int y){
if(autorunP==true)autoRun.stop();
showStatus(URLdescription[translate[frame]]);
return(true);
}//end mouseEnter
/******************************************************************************/
public boolean mouseExit(Event e, int x, int y){
if(autorunP==true)autoRun.start();
showStatus("");
return(true);
}//end mouseExit
/******************************************************************************/
public boolean mouseDrag(Event e,int x, int y){
if(x>=(oldx + 20)){
oldx=x;
frame--;
if (frame<0){frame=imageCount-1;}
}else if(x<=(oldx - 20)){
oldx=x;
frame++;
if (frame>=imageCount){frame=0;}
}
showStatus(URLdescription[translate[frame]]);
repaint();
return(true);
}//end mouseMove
/*******************************END EVENTS*************************************/
/*******************************METHODS****************************************/
public void update(Graphics g){
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) {
if(bgP==true)
g.drawImage(bg,0,0,null);
//System.out.println("paintApplet: frame="+frame);
g.drawImage(img[frame],spriteX,spriteY,null);
}//end paintApplet
/******************************************************************************/
// Applet info
public String getAppletInfo(){
return "AnimNav.class By Elijah Meeker 1/5/96";
}//end getAppletInfo
/******************************************************************************/
public String[][] getParameterInfo() {
String[][] info = {
{"[spriteX]",
"int",
"X offset of images on background [0]"},
{"[spriteY]",
"int",
"Y offset of images on background[0]"},
{"[sleeptime]",
"int",
"pause between images in AutoRun[AutoRun off]"},
{"imageCount",
"int",
"Number of animation images"},
{"translation",
"parsed string",
"which URLs go with which images,form:0|0|1|1"},
{"URLcount",
"int",
"number of URLs"},
{"dest+int",
"url",
"URL to navigate to(int min=0, max=URLcount-1"},
{"[desc+int]",
"string",
"URL description[string of dest+int]"},
{"[target+int]",
"string",
"target Window for URL[_parent]"},
{"[imagetype]",
"string",
"image type suffix W/O '.'[jpg]"},
{"[background]",
"string",
"Background image(offset from CodeBase)[no background, spriteX=spriteY=0]"},
{"prefix",
"string",
"Prefix to sprites(offset from CodeBase)"}
};
return info;
}//end getParameterInfo
/*****************************END METHODS**************************************/
}//end class AnimNav.class
/******************************************************************************/
/******************************************************************************/
/*****************************AutoRun.class************************************/
class NavAutoRun implements Runnable {
Thread T = null;
AnimNav applet;
int howLong;
/*****************************Constructors*************************************/
NavAutoRun(AnimNav applet,int time){
this.applet = applet;
howLong=time;
}//end constructor
/****************************State Changes*************************************/
public void start(){
if (T == null) {
T = new Thread(this,"T");
T.start();
T.setPriority(Thread.MIN_PRIORITY+1);
}
}//end start
/******************************************************************************/
public void run(){
while(T!=null){
applet.repaint();
applet.frame++;
if (applet.frame>=applet.imageCount){applet.frame=0;}
applet.showStatus(applet.URLdescription[applet.translate[applet.frame]]);
try {Thread.sleep(howLong);} catch (InterruptedException e){}
}//end while
}//end run
/******************************************************************************/
public void stop(){
if (T != null) {
T.stop();
T=null;
}
}//end stop
/******************************************************************************/
}//end AutoRun.class
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