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TABLE {
FONT: bold 13px Verdana
}
P {
FONT: 11px Tahoma,Verdana
}
INPUT {
FONT: 12px Tahoma,Verdana
}
SELECT {
FONT: 12px Tahoma,Verdana
}
SELECT {
WIDTH: 40px
}
A {
FONT-WEIGHT: bold
}
.tower {
LEFT: 77px; VISIBILITY: visible; FONT: bold 10px Tahoma; POSITION: absolute; TOP: 184px
}
.container {
VISIBILITY: visible; POSITION: absolute
}
.towervert {
BORDER-RIGHT: black 1px solid; BORDER-TOP: black 1px solid; VISIBILITY: visible; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid; POSITION: absolute; BACKGROUND-COLOR: black
}
.towerhoriz {
BORDER-RIGHT: black 1px solid; BORDER-TOP: black 1px solid; FONT-SIZE: 1px; VISIBILITY: visible; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid; POSITION: absolute; BACKGROUND-COLOR: black
}
.disk {
BORDER-RIGHT: black 1px solid; BORDER-TOP: black 1px solid; VISIBILITY: visible; BORDER-LEFT: black 1px solid; BORDER-BOTTOM: black 1px solid; POSITION: absolute
}



/***********************************************
* Tower of Hanoi- by Glenn G. Vergara (glenngv@REMOVETHISyahoo.com)
* This notice must stay intact for use
* Visit Dynamic Drive (http://www.dynamicdrive.com/) for full source code
***********************************************/
var delay = 200; //in milliseconds
var drag=false;
var objDisk=null;
var x = 0;
var y = 0;
var disksOnTower1 = new Array(null,null,null,null,null,null,null,null);
var disksOnTower2 = new Array(null,null,null,null,null,null,null,null);
var disksOnTower3 = new Array(null,null,null,null,null,null,null,null);
var disksOnTowers = new Array(disksOnTower1,disksOnTower2,disksOnTower3);
var offsetleft = 30;
var offsettop = 30;
var offsettower = 20;
var offsethoriz = 30;
var basetop = 0;
var diskheight = 0;
var midhoriztower = 0;
var indexTo=1;
var indexFr=1;
var movectr=0;
var gameOver=false;
var prevIndex=0;
var zindex = 0;
var currTower=1;
var prevTower=1;
var demo=false;
var arrFr = new Array(255);
var arrTo = new Array(255);
var idx = 0;
var pos = 0;
var t=null;
var stop=false;

function init(){
if (document.getElementById){
var diskno = document.hanoi.diskno;
diskno.options.selectedIndex = 0;
drawTowers();
drawDisks(parseInt(diskno.options[diskno.options.selectedIndex].text));
}
}

function initVars(){
for (var i=0;i=1;i--){
disk = document.getElementById("disk"+i);
disk.style.zIndex=++zindex;
if (i0 && !gameOver && !stop){
if (confirm("Current game will be aborted, would you like to continue?")){
initVars();
drawDisks(parseInt(obj.options[obj.options.selectedIndex].text));
}
else document.hanoi.diskno.options.selectedIndex=prevIndex;
}
else {
initVars();
drawDisks(parseInt(obj.options[obj.options.selectedIndex].text));
}
}

function initializeDrag(disk,e){
if (!e) e=event;
if (stop){
alert("You cannot continue solving the puzzle after clicking the 'Stop' button.\\nClick 'Restart' button or select no. of disks to continue playing.");
return;
}
indexFr = indexTo;
if (disk.id!=disksOnTowers[indexFr-1][0].id || gameOver || demo) return;
objDisk=disk;
x=e.clientX;
y=e.clientY;
tempx=parseInt(disk.style.left);
tempy=parseInt(disk.style.top);
document.onmousemove=dragDisk;
}

function dragDisk(e){
if (!e) e=event;
zindex++;
drag=true;
var posX = tempx+e.clientX-x;
var posY = tempy+e.clientY-y;
var objTower1 = document.getElementById("tower1");
var objTower2 = document.getElementById("tower2");
var objTower3 = document.getElementById("tower3");
var tower1Left = parseInt(objTower1.style.left);
var tower2Left = parseInt(objTower2.style.left);
var tower3Left = parseInt(objTower3.style.left);
var tower3Width = parseInt(objTower3.style.width);

objDisk.style.zIndex=zindex;
objDisk.style.left=posX+'px';
objDisk.style.top=posY+'px';

if (e.clientX>=document.body.clientWidth-10 || e.clientY>=document.body.clientHeight-5 || e.clientX==5 || e.clientY==5){ //outside available window
indexTo=indexFr;
dropDisk(objDisk);
}
else if ( //in the vicinity of tower 3
(tower3Left=posX) &&
(parseInt(objTower3.style.top)+parseInt(objTower3.style.height)>posY)
){
indexTo=3;
}
else if ((tower2Left=posX)){ //in the vicinity of tower 2
indexTo=2;
}
else if ((tower1Left=posX)){ //in the vicinity of tower 1
indexTo=1;
}
else indexTo = indexFr;
return false;
}
function dropDisk(disk){
var f=document.hanoi;
document.onmousemove=new Function("return false");
if (!drag) return;
var gameStatus=false;
var topDisk = disksOnTowers[indexTo-1][0];
if (indexFr==indexTo){
getNewTop(indexFr,null);
pushDisk(disk,indexFr); //put disk back to original tower
getNewTop(indexFr,disk);
}
else if (topDisk==null) {
pushDisk(disk,indexTo);
getNewTop(indexFr,null);
getNewTop(indexTo,disk);
movectr++;
currTower=indexTo;
prevTower=indexFr;
f.btnUndo.disabled=false;
}
else if (parseInt(disk.style.width)minmove) msg="\\nYou can do better than that."
else msg="";
alert("Game Over !!!"+msg);
gameOver=true;
}
return;
}

function checkStatus(){
var gameStat = false;
var disks=0;
for (var i=0;i0 && !gameOver && !stop)
if (!confirm("Current game will be aborted, would you like to continue?")) return;
btn.value="Stop";
initVars();
stop=false;
demo=true;
var f=document.hanoi;
f.btnIns.disabled=true;
f.btnRes.disabled=true;
f.btnUndo.disabled=true;
disknum = parseInt(f.diskno.options[f.diskno.options.selectedIndex].text);
drawDisks(disknum);
getMoves(0, 2, 1, disknum);
t=window.setTimeout("moveDisk()",delay);
}
else {
if (t) {
window.clearTimeout(t);
btn.value="Solve";
frm.btnIns.disabled=false;
frm.btnRes.disabled=false;
t = null;
stop=true;
demo=false;
}

}
}

function moveDisk(){
frm = document.hanoi;
disk=disksOnTowers[arrFr[pos]][0];
pushDisk(disk,arrTo[pos]+1);
getNewTop(arrFr[pos]+1,null);
getNewTop(arrTo[pos]+1,disk);
movectr++;
frm.yourmove.value=movectr;
pos++;
if (movectr 1) {
getMoves(from, empty, to, numDisk - 1);
arrFr[idx] = from;
arrTo[idx++] = to;
getMoves(empty, to, from, numDisk - 1);
}
else {
arrFr[idx] = from;
arrTo[idx++] = to;
}
}

function unDo(btn){
disk=disksOnTowers[currTower-1][0];
pushDisk(disk,prevTower);
getNewTop(currTower,null);
getNewTop(prevTower,disk);
movectr--;
document.hanoi.yourmove.value=movectr;
btn.disabled=true;
}

function displayIns(){
var msg="Try to move all the disks from TOWER 1 to TOWER 3.\\n";
msg+="You may only move one disk at a time.\\n";
msg+="You must never allow a bigger disk to go on top of a smaller disk.";
alert(msg);
}