Animation: Random Movement
//Random Movement - http://www.btinternet.com/~kurt.grigg/javascript
/*
Paste this js-link between the <body> </body> tags of your page HTML.
<script type="text/javascript" src="randommovement.js"></script>
Make sure that randommovement.js and pooh.gif or any other image you
want to use are in/uploaded to the same directory/folder as the web
page using the script.
If you want more than one just paste the same js-link repeatedly:
Example:-------------
<body>
<script type="text/javascript" src="randommovement.js"></script>
<script type="text/javascript" src="randommovement.js"></script>
<script type="text/javascript" src="randommovement.js"></script>
</body>
----------------------
*/
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Random Movement</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="content-script-type" content="text/javascript">
<meta http-equiv="content-style-type" content="text/css">
<style type="text/css">
<!--
body{
background-color : #000000;
}
//-->
</style>
</head>
<body>
<script type="text/javascript">
//Random Movement - http://www.btinternet.com/~kurt.grigg/javascript
if ((document.getElementById) &&
window.addEventListener || window.attachEvent){
(function(){
var rm_img = new Image();
rm_img.src = "http://www.java2s.com/style/logo.png";
var imgh = 163;
var imgw = 156;
var timer = 40; //setTimeout speed.
var min = 1; //slowest speed.
var max = 5; //fastest speed.
var idx = 1;
idx = parseInt(document.images.length);
if (document.getElementById("pic"+idx)) idx++;
var stuff = "<div id='pic"+idx+"' style='position:absolute;"
+"top:2px;left:2px;height:"+imgh+"px;width:"+imgw+"px;"
+"overflow:hidden'><img src='"+rm_img.src+"' alt=''/><\/div>";
document.write(stuff);
var h,w,r,temp;
var d = document;
var y = 2;
var x = 2;
var dir = 45; //direction.
var acc = 1; //acceleration.
var newacc = new Array(1,0,1);
var vel = 1; //initial speed.
var sev = 0;
var newsev = new Array(1,-1,2,-2,0,0,1,-1,2,-2);
//counters.
var c1 = 0; //time between changes.
var c2 = 0; //new time between changes.
var pix = "px";
var domWw = (typeof window.innerWidth == "number");
var domSy = (typeof window.pageYOffset == "number");
if (domWw) r = window;
else{
if (d.documentElement &&
typeof d.documentElement.clientWidth == "number" &&
d.documentElement.clientWidth != 0)
r = d.documentElement;
else{
if (d.body &&
typeof d.body.clientWidth == "number")
r = d.body;
}
}
function winsize(){
var oh,sy,ow,sx,rh,rw;
if (domWw){
if (d.documentElement && d.defaultView &&
typeof d.defaultView.scrollMaxY == "number"){
oh = d.documentElement.offsetHeight;
sy = d.defaultView.scrollMaxY;
ow = d.documentElement.offsetWidth;
sx = d.defaultView.scrollMaxX;
rh = oh-sy;
rw = ow-sx;
}
else{
rh = r.innerHeight;
rw = r.innerWidth;
}
h = rh - imgh;
w = rw - imgw;
}
else{
h = r.clientHeight - imgh;
w = r.clientWidth - imgw;
}
}
function scrl(yx){
var y,x;
if (domSy){
y = r.pageYOffset;
x = r.pageXOffset;
}
else{
y = r.scrollTop;
x = r.scrollLeft;
}
return (yx == 0)?y:x;
}
function newpath(){
sev = newsev[Math.floor(Math.random()*newsev.length)];
acc = newacc[Math.floor(Math.random()*newacc.length)];
c2 = Math.floor(20+Math.random()*50);
}
function moveit(){
var vb,hb,dy,dx,curr;
if (acc == 1) vel +=0.05;
if (acc == 0) vel -=0.05;
if (vel >= max) vel = max;
if (vel <= min) vel = min;
c1++;
if (c1 >= c2){
newpath();
c1=0;
}
curr = dir+=sev;
dy = vel * Math.sin(curr*Math.PI/180);
dx = vel * Math.cos(curr*Math.PI/180);
y+=dy;
x+=dx;
//horizontal-vertical bounce.
vb = 180-dir;
hb = 0-dir;
//Corner rebounds?
if ((y < 1) && (x < 1)){y = 1; x = 1; dir = 45;}
if ((y < 1) && (x > w)){y = 1; x = w; dir = 135;}
if ((y > h) && (x < 1)){y = h; x = 1; dir = 315;}
if ((y > h) && (x > w)){y = h; x = w; dir = 225;}
//edge rebounds.
if (y < 1) {y = 1; dir = hb;}
if (y > h) {y = h; dir = hb;}
if (x < 1) {x = 1; dir = vb;}
if (x > w) {x = w; dir = vb;}
//Assign it all to image.
temp.style.top = y + scrl(0) + pix;
temp.style.left = x + scrl(1) + pix;
setTimeout(moveit,timer);
}
function init(){
temp = document.getElementById("pic"+idx);
winsize();
moveit();
}
if (window.addEventListener){
window.addEventListener("resize",winsize,false);
window.addEventListener("load",init,false);
}
else if (window.attachEvent){
window.attachEvent("onresize",winsize);
window.attachEvent("onload",init);
}
})();
}//End.
</script>
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</body>
</html>
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