Membuat Gambar Mengikuti Cursor

Beberapa waktu yang lalu, saya sempat posting mengenai cara pasang komentar yang mengikuti cursor, nah sekarang bagaimana jika gambar yang mengikuti cursor tersebut...

Silahkan copas kode berikut dan ubah gambar sesuai dengan keinginan teman2... yaitu pada <img src=xxxxxxx

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</div>

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<!-- hide code

var nDots = 7;

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()", 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);

}

// 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 off 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>

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Jangan kaget kalo tiba-tiba cursor temen2 diikuti oleh lambang love.. atau gambar yang sudah temen2 tentukan Semoga bermanfaat

Sumber : DISINI

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Senin, 25 Juni 2012

Membuat Gambar Mengikuti Cursor

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