Untitled

com

tahnee.

www.

http://

***** The four red spots are where you fill in the name, so please change them!*****

The blue names are where you put in the color name, or else leave it to have it like this page.

<html>

<body>

!-- Start Elastic Bullets -->

</div>

</div>

</div>

</div>

</div>

<!-- hide code

// Elastic Bullets v1.2

// http://www.geocities.com/pwinston/ebullets

// Philip Winston <pwinston@yahoo.com>

var nDots = 5;

var Xpos = 0;

var Ypos = 0;

// fixed time step, no relation to real time

var DELTAT = .01;

// size of one spring in pixels

var SEGLEN = 10;

// spring constant, stiffness of springs

var SPRINGK = 10;

// all the physics is bogus, just picked stuff to

// make it look okay

var MASS = 1;

// Positive XGRAVITY pulls right, negative pulls left

// Positive YGRAVITY pulls down, negative up

var XGRAVITY = 0;

var YGRAVITY = -50;

// RESISTANCE determines a slowing force proportional to velocity

var RESISTANCE = 10;

// stopping criterea to prevent endless jittering

// doesn't work when sitting on bottom since floor

// doesn't push back so acceleration always as big

// as gravity

var STOPVEL = 0.1;

var STOPACC = 0.1;

var DOTSIZE = 11;

// BOUNCE is percent of velocity retained when

// bouncing off a wall

var BOUNCE = 0.75;

var isNetscape = navigator.appName=="Netscape";

// always on for now, could be played with to

// let dots fall to botton, get thrown, etc.

var followmouse = true;

var dots = new Array();

init();

function init()

{

var i = 0;

for (i = 0; i < nDots; i++) {

dots[i] = new dot(i);

}

if (!isNetscape) {

// I only know how to read the locations of the

// <LI> items in IE

//skip this for now

// setInitPositions(dots)

}

// set their positions

for (i = 0; i < nDots; i++) {

dots[i].obj.left = dots[i].X;

dots[i].obj.top = dots[i].Y;

}

if (isNetscape) {

// start right away since they are positioned

// at 0, 0

startanimate();

} else {

// let dots sit there for a few seconds

// since they're hiding on the real bullets

setTimeout("startanimate()", 100);

}

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);

}

// This is to line up the bullets with actual LI tags on the page

// Had to add -DOTSIZE to X and 2*DOTSIZE to Y for IE 5, not sure why

// Still doesn't work great

function setInitPositions(dots)

{

// initialize dot positions to be on top

// of the bullets in the <ul>

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;

}

// put 0th dot above 1st (it is hidden)

dots[0].X = dots[1].X;

dots[0].Y = dots[1].Y - SEGLEN;

}

// just save mouse position for animate() to use

function MoveHandler(e)

{

Xpos = e.pageX;

Ypos = e.pageY;

return true;

}

// just save mouse position for animate() to use

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;

}

// adds force in X and Y to spring for dot[i] on dot[j]

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() {

// dots[0] follows the mouse,

// though no dot is drawn there

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);

}

// air resisitance/friction

var resist = new vec(-dots[i].dx * RESISTANCE,

-dots[i].dy * RESISTANCE);

// compute new accel, including gravity

var accel = new vec((spring.X + resist.X)/MASS + XGRAVITY,

(spring.Y + resist.Y)/ MASS + YGRAVITY);

// compute new velocity

dots[i].dx += (DELTAT * accel.X);

dots[i].dy += (DELTAT * accel.Y);

// stop dead so it doesn't jitter when nearly still

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;

}

// move to new position

dots[i].X += dots[i].dx;

dots[i].Y += dots[i].dy;

// get size of window

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;

}

// bounce of 3 walls (leave ceiling open)

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;

}

// move img to new position

dots[i].obj.left = dots[i].X;

dots[i].obj.top = dots[i].Y;

}

// end code hiding -->

</script>

</body>

</html>

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