/*
-------Head--------
---------Body-------Remember initialisation should be below all the div
A
b
c
d
e
f
g
//*/
/*Elastic Trail script By Philip Winston//*/
var nDots = 8;
var Xpos = 0;
var Ypos = 0;
var DELTAT = .01;
var SEGLEN = 10;
var SPRINGK = 10;
var MASS = 1;
var XGRAVITY = 0;
var YGRAVITY = 50;
var RESISTANCE = 10;
var STOPVEL = 0.1;
var STOPACC = 0.1;
var DOTSIZE = 11;
var BOUNCE = 0.75;
var isNetscape = navigator.appName=="Netscape";
var followmouse = true;
var dots = new Array();
function MouseTrail()
{
var i = 0;
for (i = 0; i < nDots; i++){dots[i] = new dot(i);}
if(!isNetscape){/* setInitPositions(dots)//*/ }
for(i = 0; i < nDots; i++){dots[i].obj.left = dots[i].X;dots[i].obj.top = dots[i].Y;}
if(isNetscape){startanimate();}
else{setTimeout("startanimate()", 1000);}
}
function dot(i)
{
this.X = Xpos;
this.Y = Ypos;
this.dx = 0;
this.dy = 0;
if(isNetscape){this.obj = eval("document.dot" + i);}
else{this.obj = eval("dot" + i + ".style");}
}
function startanimate(){setInterval("animate()", 20);}
function setInitPositions(dots)
{
var startloc = document.all.tags("LI");
var i = 0;
for (i = 0; i < startloc.length && i < (nDots - 1); i++)
{
dots[i+1].X = startloc[i].offsetLeft+startloc[i].offsetParent.offsetLeft - DOTSIZE;
dots[i+1].Y = startloc[i].offsetTop +startloc[i].offsetParent.offsetTop + 2*DOTSIZE;
}
dots[0].X = dots[1].X;
dots[0].Y = dots[1].Y - SEGLEN;
}
function MoveHandler(e)
{
Xpos = e.pageX;
Ypos = e.pageY;
return true;
}
function MoveHandlerIE() {
Xpos = window.event.x + document.body.scrollLeft;
Ypos = window.event.y + document.body.scrollTop;
}
if(isNetscape){document.captureEvents(Event.MOUSEMOVE);document.onMouseMove = MoveHandler;}
else{document.onmousemove = MoveHandlerIE;}
function vec(X, Y){this.X = X;this.Y = Y;}
function springForce(i, j, spring)
{
var dx = (dots[i].X - dots[j].X);
var dy = (dots[i].Y - dots[j].Y);
var len = Math.sqrt(dx*dx + dy*dy);
if (len > SEGLEN){var springF = SPRINGK * (len - SEGLEN);spring.X += (dx / len) * springF;spring.Y += (dy / len) * springF; }
}
function animate()
{
var start = 0;
if(followmouse){dots[0].X = Xpos;dots[0].Y = Ypos;start = 1;}
for(i = start; i < nDots; i++ )
{
var spring = new vec(0, 0);
if(i>0){springForce(i-1, i, spring);}
if(i<(nDots - 1)){springForce(i+1, i, spring);}
var resist = new vec(-dots[i].dx * RESISTANCE,-dots[i].dy * RESISTANCE);
var accel = new vec((spring.X + resist.X)/MASS + XGRAVITY,(spring.Y + resist.Y)/ MASS + YGRAVITY);
dots[i].dx += (DELTAT * accel.X);
dots[i].dy += (DELTAT * accel.Y);
if(Math.abs(dots[i].dx) < STOPVEL && Math.abs(dots[i].dy) < STOPVEL && Math.abs(accel.X) < STOPACC && Math.abs(accel.Y) < STOPACC)
{
dots[i].dx = 0;
dots[i].dy = 0;
}
dots[i].X += dots[i].dx;
dots[i].Y += dots[i].dy;
var height, width;
if(isNetscape)
{
height = window.innerHeight + window.pageYOffset;
width = window.innerWidth + window.pageXOffset;
}
else
{
height = document.body.clientHeight + document.body.scrollTop;
width = document.body.clientWidth + document.body.scrollLeft;
}
if (dots[i].Y >= height - DOTSIZE - 1)
{
if(dots[i].dy > 0){dots[i].dy = BOUNCE * -dots[i].dy;}
dots[i].Y = height - DOTSIZE - 1;
}
if(dots[i].X >= width - DOTSIZE)
{
if (dots[i].dx > 0){dots[i].dx = BOUNCE * -dots[i].dx;}
dots[i].X = width - DOTSIZE - 1;
}
if(dots[i].X < 0)
{
if (dots[i].dx < 0){dots[i].dx = BOUNCE * -dots[i].dx;}
dots[i].X = 0;
}
dots[i].obj.left = dots[i].X;
dots[i].obj.top = dots[i].Y;
}
}