<SCRIPT language=JavaScript><!-- //

// ############### init functions ###################################
// globals
var running= 0; var count; // game state and tiles matched counter
var tiles= 6; // number of tiles per set
var sets= 4; // number of sets
var howmany; var width; var height; // how many tiles per game and board shape

// get difficulty level:
var passed= window.location.search.substring(1);
var diff= getParm(passed,'d')- 0; if (diff==0) diff=2;
if (diff== 1) {
howmany= tiles*(sets-2); width= 6; var height= 4;
} else if (diff== 2) {
howmany= tiles*(sets-1); width= 6; var height= 6;
} else { // diff== 3
howmany= tiles*sets; width= 6; var height= 8;
} // (make sure that howmany*2 == width*height)

var board= new Array(width*height); // the hidden tiles
var sel= -1; // the tile currently selected
var delay= 750; // length of time (ms) that pairs are revealed

function preload() {
if (document.images) {
tile= new makeArray(tiles*sets+1);
tile[0].src= "images/tileup.gif";

for (var s=1; s<=sets; s++) {
for (var t=1; t<=tiles; t++) {
tile[((s-1)*tiles)+t].src= "images/"+s+"_"+t+".gif";
}
}

blank= new Image(); blank.src= "../common/blank.gif";

} else {
alert("Sorry, this game needs to run on a browser\nwhich supports JavaScript");
}
}

function select(pos) {
if (!running) return;

// do we have a tile already revealed?
if (sel>= 0) {

// are we choosing an unrevealed tile?
if (document.images[""+pos].src== tile[0].src) {

// reveal the new tile:
document.images[""+pos].src= tile[board[pos]].src;

// do we have a match?
if (board[pos]== board[sel]) {
// yep, so clear the tiles:
running= 0; document.user.goes.value++; count++;
setTimeout('clear('+sel+','+pos+',1)', delay);
if (count== howmany) { setTimeout('alert("Well done!\\n")', delay+10); }
} else {
// nope, so re-hide the tiles:
running= 0; document.user.goes.value++;
setTimeout('clear('+sel+','+pos+',0)', delay);
}
sel= -1;
}

} else if (document.images[pos].src!= blank.src) {

// no tile currently selected:
document.images[""+pos].src= tile[board[pos]].src;
sel= pos;
}
}

function clear(posA, posB, flag) {
var clear= (flag) ? blank.src : tile[0].src
document.images[""+posA].src= clear;
document.images[""+posB].src= clear;
running= 1;
}


function newgame() {
var index= document.user.diff.selectedIndex;
var tmp_d= document.user.diff.options[index].value;
if (tmp_d!= diff) {
// options have changed so we need to redraw the page:
window.location.href= "index.htm?d="+tmp_d;

} else {
// reset the board:
for (var i=0; i<(width*height); i++) {
board[i]= 0;
document.images[""+i].src= tile[0].src;
}

var temp= new Array(tiles*sets+1);
for (var i=0; i<tiles*sets+1; i++) { temp[i]=0; }
var what= (rand(sets)*tiles)+rand(tiles)+1;
var where= rand(width*height);

// pick random tiles out of the ones we have available:
for (var i=0; i<howmany; i++) {
while (temp[what]) {
what= (rand(sets)*tiles)+rand(tiles)+1;
}
temp[what]= 1;
while (board[where]) { where= rand(width*height); }
board[where]= what;
while (board[where]) { where= rand(width*height); }
board[where]= what;
}

document.user.goes.value= 0; sel= -1; count= 0;
running= 1;
}
}

function help() {
alert("Icon Match v0.10 by Keith Drakard (kif@irt.org) 27/01/99\n\nThe aim of this memory game is to match up the pairs of tiles\nin as few moves as you can.\n");
}

// The Central Randomizer 1.3 (C) 1997 by Paul Houle (houle@msc.cornell.edu)
// See: http://www.msc.cornell.edu/~houle/javascript/randomizer.html
// NOTE:- this example is set up to produce integers between 0-(limit-1)
rnd.today=new Date(); rnd.seed=rnd.today.getTime();
function rnd() {
rnd.seed = (rnd.seed*9301+49297) % 233280;
return rnd.seed/(233280.0);
}
function rand(limit) {
return Math.ceil(rnd()*limit)-1;
}

// The following functions were written by Martin Webb at http://www.irt.org/
function makeArray(n) {
this.length= n; for (i=0; i<n; i++) { this[i]= new Image(); }
return this;
}
function getParm(string,parm) {
var startPos= string.indexOf(parm+"=");
if (startPos> -1) {
startPos= startPos+ 2;
var endPos= string.indexOf("&",startPos);
if (endPos== -1) endPos= string.length;
return unescape(string.substring(startPos,endPos));
}
return '';
}

//--></SCRIPT>

<SCRIPT language=JavaScript><!-- //

var output= '';
output+= '<FORM NAME="user">';
output+= '<TABLE ALIGN=center CELLSPACING=4 CELLPADDING=0 BORDER=0>\n';
output+= '<TR><TD COLSPAN=2 ALIGN=center><H1>Icon Match</H1></TD></TR>\n';

// create the board
output+= '<TR><TD COLSPAN=2 ALIGN=center><TABLE CELLSPACING=2 CELLPADDING=0 BORDER=1>\n';
for (y=0; y<height; y++) {
for (x=0; x<width; x++) {
if (x== 0) output+= '<TR>';
output+= '<TD><A HREF="javascript:select('+((y*width)+x)+')" onFocus="blur()">';
output+= '<IMG SRC="images/tileup.gif" onDblClick="select('+((y*width)+x)+')"';
output+= ' NAME="'+((y*width)+x)+'" WIDTH=40 HEIGHT=40 ALT="" BORDER=0></A></TD>';
if (x== width-1) output+= '</TR>\n';
}
}
output+= '</TABLE></TD></TR>\n';

// add timer??

output+= '<TR><TD ALIGN=center><br><br>Goes: <INPUT TYPE="text"';
output+= ' SIZE=3 VALUE=0 onFocus="blur()" NAME="goes"></TD>';
output+= '<TD ALIGN=center><br><br>Difficulty: <SELECT NAME="diff" SIZE=1>';
output+= '<OPTION VALUE=1'; if (diff==1) output+=' SELECTED';
output+= '>Easy<OPTION VALUE=2'; if (diff==2) output+=' SELECTED';
output+= '>Medium<OPTION VALUE=3'; if (diff==3) output+= ' SELECTED';
output+= '>Hard</SELECT></TD></TR>';

output+= '<TR><TD COLSPAN=2 ALIGN=center><br><INPUT TYPE="button" VALUE=" New Game "';
output+= ' onClick="newgame()" onFocus="blur()" NAME="new"></TD></TR>';

output+= '</TABLE></FORM>\n';

output+= '<B><A HREF="javascript:help()">INSTRUCTIONS</A></B><br><br><SMALL><A HREF="mailto:kif\@irt.org">';
output+= 'Keith Drakard</A> v0.10 27th January 1999<br><br><A HREF="../../all.htm">';
output+= 'Back to WebGames</A></SMALL>\n';

document.write(output);
preload(); newgame();

//--></SCRIPT>

IRT.org