跟随鼠标炫酷网站引导页的html5动画特效

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>html5跟随鼠标炫酷网站引导页动画 - 何问起</title>
<link href="http://hovertree.com/texiao/html5/index/hovertree**.css" type="text/css" rel="stylesheet">



<div id="hovertreecontainer">

<div>
<h1 id="h1">何问起 </h1>
<h2 id="h2"> 想问候，不知从何问起，就直接说喜欢你！</h2>
<h3 id="h2">hovertree.com为您提供前端特效,ASP.NET等设计开发资料。<a href="http://hovertree.com/hvtart/bjae/onxw4ahp.htm">原文</a> <a href="http://hovertree.com/texiao/">特效</a></h3>
<p> </p>
<p><strong><a href="http://hovertree.com/">进入主站</a></strong></p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
</div>

</div>

<canvas id="canvas"></canvas>
<audio autoplay="autoplay">
<source src="http://hovertree.com" type="audio/ogg">
<source src="http://cms.hovertree.com/hovertreesound/hovertreexihuanni.mp3" type="audio/mpeg">
您的浏览器不支持播放音乐。请用支持html5的浏览器打开,例如chrome或火狐或者新版IE等。
<br>何问起 hovertree.com
</audio><script type="text/javascript" src="http://hovertree.com/texiao/html5/index/hovertree**.js">
</script>
<script type="text/javascript">

; (function (window) {

var ctx,
hue,
logo,
form,
buffer,
target = {},
tendrils = [],
settings = {};

settings.debug = true;
settings.friction = 0.5;
settings.trails = 20;
settings.size = 50;
settings.dampening = 0.25;
settings.tension = 0.98;

Math.TWO_PI = Math.PI * 2;

// ========================================================================================
// Oscillator 何问起
// ----------------------------------------------------------------------------------------

function Oscillator(options) {
this.init(options || {});
}

Oscillator.prototype = (function () {

var value = 0;

return {

init: function (options) {
this.phase = options.phase || 0;
this.offset = options.offset || 0;
this.frequency = options.frequency || 0.001;
this.amplitude = options.amplitude || 1;
},

update: function () {
this.phase += this.frequency;
value = this.offset + Math.sin(this.phase) * this.amplitude;
return value;
},

value: function () {
return value;
}
};

})();

// ========================================================================================
// Tendril hovertree.com
// ----------------------------------------------------------------------------------------

function Tendril(options) {
this.init(options || {});
}

Tendril.prototype = (function () {

function Node() {
this.x = 0;
this.y = 0;
this.vy = 0;
this.vx = 0;
}

return {

init: function (options) {

this.spring = options.spring + (Math.random() * 0.1) - 0.05;
this.friction = settings.friction + (Math.random() * 0.01) - 0.005;
this.nodes = [];

for (var i = 0, node; i < settings.size; i++) {

node = new Node();
node.x = target.x;
node.y = target.y;

this.nodes.push(node);
}
},

update: function () {

var spring = this.spring,
node = this.nodes[0];

node.vx += (target.x - node.x) * spring;
node.vy += (target.y - node.y) * spring;

for (var prev, i = 0, n = this.nodes.length; i < n; i++) {

node = this.nodes[i];

if (i > 0) {

prev = this.nodes[i - 1];

node.vx += (prev.x - node.x) * spring;
node.vy += (prev.y - node.y) * spring;
node.vx += prev.vx * settings.dampening;
node.vy += prev.vy * settings.dampening;
}

node.vx *= this.friction;
node.vy *= this.friction;
node.x += node.vx;
node.y += node.vy;

spring *= settings.tension;
}
},

draw: function () {

var x = this.nodes[0].x,
y = this.nodes[0].y,
a, b;

ctx.beginPath();
ctx.moveTo(x, y);

for (var i = 1, n = this.nodes.length - 2; i < n; i++) {

a = this.nodes[i];
b = this.nodes[i + 1];
x = (a.x + b.x) * 0.5;
y = (a.y + b.y) * 0.5;

ctx.quadraticCurveTo(a.x, a.y, x, y);
}

a = this.nodes[i];
b = this.nodes[i + 1];

ctx.quadraticCurveTo(a.x, a.y, b.x, b.y);
ctx.stroke();
ctx.closePath();
}
};

})();

// ----------------------------------------------------------------------------------------

function init(event) {

document.removeEventListener('mousemove', init);
document.removeEventListener('touchstart', init);

document.addEventListener('mousemove', mousemove);
document.addEventListener('touchmove', mousemove);
document.addEventListener('touchstart', touchstart);

mousemove(event);
reset();
loop();
}

function reset() {

tendrils = [];

for (var i = 0; i < settings.trails; i++) {

tendrils.push(new Tendril({
spring: 0.45 + 0.025 * (i / settings.trails)
}));
}
}

function loop() {

if (!ctx.running) return;

ctx.globalCompositeOperation = 'source-over';
ctx.fillStyle = 'rgba(8,5,16,0.4)';
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.globalCompositeOperation = 'lighter';
ctx.strokeStyle = 'hsla(' + Math.round(hue.update()) + ',90%,50%,0.25)';
ctx.lineWidth = 1;

if (ctx.frame % 60 == 0) {
console.log(hue.update(), Math.round(hue.update()), hue.phase, hue.offset, hue.frequency, hue.amplitude);
}

for (var i = 0, tendril; i < settings.trails; i++) {
tendril = tendrils[i];
tendril.update();
tendril.draw();
}

ctx.frame++;
ctx.stats.update();
requestAnimFrame(loop);
}

function resize() {
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
}

function start() {
if (!ctx.running) {
ctx.running = true;
loop();
}
}

function stop() {
ctx.running = false;
}

function mousemove(event) {
if (event.touches) {
target.x = event.touches[0].pageX;
target.y = event.touches[0].pageY;
} else {
target.x = event.clientX
target.y = event.clientY;
}
event.preventDefault();
}

function touchstart(event) {
if (event.touches.length == 1) {
target.x = event.touches[0].pageX;
target.y = event.touches[0].pageY;
}
}

function keyup(event) {

switch (event.keyCode) {
case 32:
save();
break;
default:
// console.log(event.keyCode); hovertree.com
}
}

function letters(id) {

var el = document.getElementById(id),
letters = el.innerHTML.replace('&', '&').split(''),
heading = '';

for (var i = 0, n = letters.length, letter; i < n; i++) {
letter = letters[i].replace('&', '&');
heading += letter.trim() ? '<span class="letter-' + i + '">' + letter + '</span>' : ' ';
}

el.innerHTML = heading;
setTimeout(function () {
el.className = 'transition-in';
}, (Math.random() * 500) + 500);
}

function save() {

if (!buffer) {

buffer = document.createElement('canvas');
buffer.width = screen.availWidth;
buffer.height = screen.availHeight;
buffer.ctx = buffer.getContext('2d');

form = document.createElement('form');
form.method = 'post';
form.input = document.createElement('input');
form.input.type = 'hidden';
form.input.name = 'data';
form.appendChild(form.input);

document.body.appendChild(form);
}

buffer.ctx.fillStyle = 'rgba(8,5,16)';
buffer.ctx.fillRect(0, 0, buffer.width, buffer.height);

buffer.ctx.drawImage(canvas,
Math.round(buffer.width / 2 - canvas.width / 2),
Math.round(buffer.height / 2 - canvas.height / 2)
);

buffer.ctx.drawImage(logo,
Math.round(buffer.width / 2 - logo.width / 4),
Math.round(buffer.height / 2 - logo.height / 4),
logo.width / 2,
logo.height / 2
);

window.open(buffer.toDataURL(), 'wallpaper', 'top=0,left=0,width=' + buffer.width + ',height=' + buffer.height);

// form.input.value = buffer.toDataURL().substr(22);
// form.submit(); hovertree.com
}

window.requestAnimFrame = (function () {
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function (fn) { window.setTimeout(fn, 1000 / 60) };
})();

window.onload = function () {

ctx = document.getElementById('canvas').getContext('2d');
ctx.stats = new Stats();
ctx.running = true;
ctx.frame = 1;

logo = new Image();
logo.src = 'ht' + 'tp://ho' + 'vertree.c' + 'om/themes/hvtimages/hvtlogo.p' + 'ng';

hue = new Oscillator({
phase: Math.random() * Math.TWO_PI,
amplitude: 85,
frequency: 0.0015,
offset: 285
});

letters('h1');
letters('h2');

document.addEventListener('mousemove', init);
document.addEventListener('touchstart', init);
document.body.addEventListener('orientationchange', resize);
window.addEventListener('resize', resize);
window.addEventListener('keyup', keyup);
window.addEventListener('focus', start);
window.addEventListener('blur', stop);

resize();

if (window.DEBUG) {

var gui = new dat.GUI();

// gui.add(settings, 'debug');
settings.gui.add(settings, 'trails', 1, 30).onChange(reset);
settings.gui.add(settings, 'size', 25, 75).onFinishChange(reset);
settings.gui.add(settings, 'friction', 0.45, 0.55).onFinishChange(reset);
settings.gui.add(settings, 'dampening', 0.01, 0.4).onFinishChange(reset);
settings.gui.add(settings, 'tension', 0.95, 0.999).onFinishChange(reset);

document.body.appendChild(ctx.stats.domElement);
}
};

})(window);

</script>