I'm in a javascript class in my Highschool, so i figure i should start early. The first thing i usually do when figuring out a language is copy some code from some website and run it. I'm trying to get this game to work:
http://javascript.internet.com/games/ants.html
This is the code from that page:
<!-- THREE STEPS TO INSTALL ANTS:
1. Copy the coding into the HEAD of your HTML document
2. Add the onLoad event handler into the BODY tag
3. Put the last coding into the BODY of your HTML document -->
<!-- STEP ONE: Paste this code into the HEAD of your HTML document -->
<HEAD>
<style type="text/css">
.ant {
height: 16px;
position: absolute;
visibility: hidden;
width: 16px;
}
</style>
<SCRIPT LANGUAGE="JavaScript">
<!-- Original: Mike Hall ([email protected]) -->
<!-- Web Site: http://members.aol.com/MHall75819 -->
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->
<!-- Begin
var dir = "http://www.your-web-site-address-here.com/where-you-put-the-ant-images/";
// get the ant images in a single zip file from
// http://javascript.internet.com/img/ants/ants.zip
// Extract the images then upload them to your server and
// change the 'dir' variable to their location (end with a '/')
var images = new Array(
dir+"antdl.gif",
dir+"antdn.gif",
dir+"antdr.gif",
dir+"antlt.gif",
dir+"antrt.gif",
dir+"antul.gif",
dir+"antup.gif",
dir+"antur.gif"
);
var isMinNS4 = (document.layers) ? 1 : 0;
var isMinIE4 = (document.all) ? 1 : 0;
var _LBimgList;
var _LBimgCount;
var _LBbase = "LBbase";
var _LBlow = "LBlow";
var _LBhigh = "LBhigh";
var _LBwidth;
var _LBheight;
var _LBbaseLayer;
var _LBlowLayer;
var _LBhighLayer;
function createLoadBar(width, height, bdSize, bdColor, bgColor, fgColor, fontFace, fontSize, text) {
var txtLow, txtHigh, tblStart, tblEnd;
var str;
txtLow = '<font color="' + fgColor + '" face="' + fontFace + '" size=' + fontSize + '>' + text + '</font>';
txtHigh = '<font color="' + bgColor + '" face="' + fontFace + '" size=' + fontSize + '>' + text + '</font>';
tblStart = '<table border=0 cellpadding=0 cellspacing=0 height=100% width=100%><tr valign="center"><td align="center">';
tblEnd = '</td></tr></table>';
if (isMinNS4)
str = '<layer name="' + _LBbase + '" bgcolor="' + bdColor + '" width=' + width + ' height=' + height + ' visibility="hide">\n'
+ ' <layer name="' + _LBlow + '" bgcolor="' + bgColor + '" left=' + bdSize + ' top=' + bdSize + ' width=' + (width - 2 * bdSize) + ' height=' + (height - 2 * bdSize) + '>' + tblStart + txtLow + tblEnd + '</layer>\n'
+ ' <layer name="' + _LBhigh + '" bgcolor="' + fgColor + '" left=' + bdSize + ' top=' + bdSize + ' width=' + (width - 2 * bdSize) + ' height=' + (height - 2 * bdSize) + '>' + tblStart + txtHigh + tblEnd + '</layer>\n'
+ '</layer>';
if (isMinIE4)
str = '<div id="' + _LBbase + '" style="position:absolute; background-color:' + bdColor + '; width:' + width + 'px; height:' + height + 'px; visibility:hidden;">\n'
+ ' <div id="' + _LBlow + '" style="position:absolute; background-color=' + bgColor + '; left:' + bdSize + 'px; top:' + bdSize + 'px; width:' + (width - 2 * bdSize) + 'px; height:' + (height - 2 * bdSize) + 'px;">' + tblStart + txtLow + tblEnd + '</div>\n'
+ ' <div id="' + _LBhigh + '" style="position:absolute; background-color=' + fgColor + '; left:' + bdSize + 'px; top:' + bdSize + 'px; width:' + (width - 2 * bdSize) + 'px; height:' + (height - 2 * bdSize) + 'px;">' + tblStart + txtHigh + tblEnd + '</div>\n'
+ '</div>';
document.writeln(str);
_LBwidth = width - 2 * bdSize;
_LBheight = height - 2 * bdSize;
}
function startLoadBar(srcList, x, y) {
var i, w, h;
if (isMinNS4) {
_LBbaseLayer = document.layers[_LBbase];
_LBlowLayer = _LBbaseLayer.document.layers[_LBlow];
_LBhighLayer = _LBbaseLayer.document.layers[_LBhigh];
}
if (isMinIE4) {
_LBbaseLayer = eval('document.all.' + _LBbase);
_LBlowLayer = eval('document.all.' + _LBlow);
_LBhighLayer = eval('document.all.' + _LBhigh);
}
if (isMinNS4) {
w = window.innerWidth;
h = window.innerHeight;
}
if (isMinIE4) {
w = document.body.clientWidth;
h = document.body.clientHeight;
}
if (x == null)
x = Math.round((w - _LBwidth) / 2);
if (y == null)
y = Math.round((h - _LBheight) / 2);
moveLayerTo(_LBbaseLayer, x, y);
clipLayer(_LBhighLayer, 0, 0, 0, _LBheight);
showLayer(_LBbaseLayer);
_LBimgCount = 0;
_LBimgList = new Array();
for (i = 0; i < srcList.length; i++) {
_LBimgList[i] = new Image();
_LBimgList[i].onabort = _LBupdate;
_LBimgList[i].onerror = _LBupdate;
_LBimgList[i].onload = _LBupdate;
}
for (i = 0; i < srcList.length; i++)
_LBimgList[i].src = srcList[i];
}
function endLoadBar() { // empty (can be changed) function called when finished
}
function _LBupdate() {
var pct;
_LBimgCount++;
pct = _LBimgCount / _LBimgList.length;
clipLayer(_LBhighLayer, 0, 0, Math.round(pct * _LBwidth), _LBheight);
if (_LBimgCount == _LBimgList.length) {
setTimeout('hideLayer(_LBbaseLayer)', 500);
endLoadBar();
}
}
function moveLayerTo(layer, x, y) {
if (isMinNS4)
layer.moveTo(x, y);
if (isMinIE4) {
layer.style.left = x;
layer.style.top = y;
}
}
function hideLayer(layer) {
if (isMinNS4)
layer.visibility = "hide";
if (isMinIE4)
layer.style.visibility = "hidden";
}
function getWindowWidth() {
if (isMinNS4)
return(window.innerWidth);
if (isMinIE4)
return(document.body.offsetWidth);
return(-1);
}
function getWindowHeight() {
if (isMinNS4)
return(window.innerHeight);
if (isMinIE4)
return(document.body.offsetHeight);
return(-1);
}
function getPageScrollX() {
if (isMinNS4)
return(window.pageXOffset);
if (isMinIE4)
return(document.body.scrollLeft);
return(-1);
}
function getPageScrollY() {
if (isMinNS4)
return(window.pageYOffset);
if (isMinIE4)
return(document.body.scrollTop);
return(-1);
}
function getHeight(layer) {
if (isMinNS4) {
if (layer.document.height)
return(layer.document.height);
else
return(layer.clip.bottom - layer.clip.top);
}
if (isMinIE4) {
if (false && layer.style.pixelHeight)
return(layer.style.pixelHeight);
else
return(layer.clientHeight);
}
return(-1);
}
function getWidth(layer) {
if (isMinNS4) {
if (layer.document.width)
return(layer.document.width);
else
return(layer.clip.right - layer.clip.left);
}
if (isMinIE4) {
if (layer.style.pixelWidth)
return(layer.style.pixelWidth);
else
return(layer.clientWidth);
}
return(-1);
}
function getLeft(layer) {
if (isMinNS4)
return(layer.left);
if (isMinIE4)
return(layer.style.pixelLeft);
return(-1);
}
function getTop(layer) {
if (isMinNS4)
return(layer.top);
if (isMinIE4)
return(layer.style.pixelTop);
return(-1);
}
function getRight(layer) {
if (isMinNS4)
return(layer.left + getWidth(layer));
if (isMinIE4)
return(layer.style.pixelLeft + getWidth(layer));
return(-1);
}
function getBottom(layer) {
if (isMinNS4)
return(layer.top + getHeight(layer));
else if (isMinIE4)
return(layer.style.pixelTop + getHeight(layer));
return(-1);
}
function moveLayerBy(layer, dx, dy) {
if (isMinNS4)
layer.moveBy(dx, dy);
if (isMinIE4) {
layer.style.pixelLeft += dx;
layer.style.pixelTop+= dy;
}
}
function showLayer(layer) {
if (isMinNS4)
layer.visibility = "show";
if (isMinIE4)
layer.style.visibility = "visible";
}
function clipLayer(layer, clipleft, cliptop, clipright, clipbottom) {
if (isMinNS4) {
layer.clip.left = clipleft;
layer.clip.top= cliptop;
layer.clip.right= clipright;
layer.clip.bottom = clipbottom;
}
if (isMinIE4)
layer.style.clip = 'rect(' + cliptop + ' ' +clipright + ' ' + clipbottom + ' ' + clipleft +')';
}
var mouseX = 0;
var mouseY = 0;
if (isMinNS4)
document.captureEvents(Event.MOUSEMOVE);
document.onmousemove = getMousePosition;
function init() {
startLoadBar(images);
}
function getMousePosition(e) {
if (isMinNS4) {
mouseX = e.pageX;
mouseY = e.pageY;
}
if (isMinIE4) {
mouseX = event.clientX + document.body.scrollLeft;
mouseY = event.clientY + document.body.scrollTop;
}
return true;
}
var ants = new Array(8);
function endLoadBar() {
var i;
for (i = 0; i < ants.length; i++) {
if (isMinNS4) {
ants[i] = document.layers["ant" + (i + 1)];
ants[i].image = ants[i].document.images["antimg" + (i + 1)];
}
if (isMinIE4) {
ants[i] = eval('document.all.ant' + (i + 1));
ants[i].image = document.images["antimg" + (i + 1)];
}
initAnt(i);
showLayer(ants[i]);
}
updateAnts();
}
function initAnt(n) {
var s, x, y;
x = Math.floor(Math.random() * getWindowWidth());
y = Math.floor(Math.random() * getWindowHeight());
s = Math.floor(Math.random() * 4);
if (s == 0)
x = -getWidth(ants[n]);
if (s == 1)
x = getWindowWidth();
if (s == 2)
y = -getHeight(ants[n]);
if (s == 3)
y = getWindowHeight();
x += getPageScrollX();
y += getPageScrollY();
moveLayerTo(ants[n], x, y);
}
function updateAnts() {
var i, dx, dy, theta, d;
d = 3;
for (i = 0; i < ants.length; i++) {
dx = mouseX - getLeft(ants[i]);
dy = mouseY - getTop(ants[i]);
theta = Math.round(Math.atan2(-dy, dx) * 180 / Math.PI);
if (theta < 0)
theta += 360;
if (Math.abs(dx) < d && Math.abs(dy) < d)
initAnt(i);
else if (theta > 22.5 && theta <= 67.5) {
moveLayerBy(ants[i], d, -d);
ants[i].image.src = dir+"antur.gif";
}
else if (theta > 67.5 && theta <= 112.5) {
moveLayerBy(ants[i], 0, -d);
ants[i].image.src = dir+"antup.gif";
}
else if (theta > 112.5 && theta <= 157.5) {
moveLayerBy(ants[i], -d, -d);
ants[i].image.src = dir+"antul.gif";
}
else if (theta > 157.5 && theta <= 202.5) {
moveLayerBy(ants[i], -d, 0);
ants[i].image.src = dir+"antlt.gif";
}
else if (theta > 202.5 && theta <= 247.5) {
moveLayerBy(ants[i], -d, d);
ants[i].image.src = dir+"antdl.gif";
}
else if (theta > 247.5 && theta <= 292.5) {
moveLayerBy(ants[i], 0, d);
ants[i].image.src = dir+"antdn.gif";
}
else if (theta > 292.5 && theta <= 337.5) {
moveLayerBy(ants[i], d, d);
ants[i].image.src = dir+"antdr.gif";
}
else {
moveLayerBy(ants[i], d, 0);
ants[i].image.src = dir+"antrt.gif";
}
}
setTimeout('updateAnts()', 50);
return;
}
// End -->
</script>
</HEAD>
<!-- STEP TWO: Insert the onLoad event handler into your BODY tag -->
<BODY OnLoad="init()">
<!-- STEP THREE: Copy this code into the BODY of your HTML document -->
<script language="JavaScript">
createLoadBar(240, 20, 1, "#000000", "#cccccc", "#999999", "MS Sans serif,Arial,Helvetica", 1, "<b>Loading ants, please wait...</b>");
</script>
<div id="ant1" class="ant"><img name="antimg1" src="transparent.gif" width=13 height=13></div>
<div id="ant2" class="ant"><img name="antimg2" src="transparent.gif" width=13 height=13></div>
<div id="ant3" class="ant"><img name="antimg3" src="transparent.gif" width=13 height=13></div>
<div id="ant4" class="ant"><img name="antimg4" src="transparent.gif" width=13 height=13></div>
<div id="ant5" class="ant"><img name="antimg5" src="transparent.gif" width=13 height=13></div>
<div id="ant6" class="ant"><img name="antimg6" src="transparent.gif" width=13 height=13></div>
<div id="ant7" class="ant"><img name="antimg7" src="transparent.gif" width=13 height=13></div>
<div id="ant8" class="ant"><img name="antimg8" src="transparent.gif" width=13 height=13></div>
<p><center>
<font face="arial, helvetica" size="-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>
<!-- Script Size: 10.57 KB -->
I figure that using that code would look something like this:
<HTML>
->Code from step one
<BODY OnLoad="init()">
->Code from step two
</BODY>
</HTML>
But whenever i turn that into a .html file and open it, i just get an error that says "undefined".
I've put the ant images in "D:/" and replaced this line
var dir = "http://www.your-web-site-address-here.com/where-you-put-the-ant-images/";
with this:
var dir = "D:/";
But i still can't get the error to go away, and i have no clue what's causing this. Any help?
