<!DOCTYPE html>
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<head>
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<meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=.8, minimum-scale=.8, maximum-scale=.8, user-scalable=no">
<meta name="robots" content="noindex">
<title>io-fx11</title>
<meta name="author" content="iowen.cn">
<style>
html,body{padding:0px;margin:0px;width:100%;height:100%;position:fixed}
body{display:flex;justify-content:center;align-items:center;-webkit-filter:contrast(120%);filter:contrast(120%);background-color:black}
.container{width:100%;height:100%;background-image:radial-gradient(1600px at 70% 120%,rgba(33,39,80,1) 10%,#020409 100%)}
.content{width:inherit;height:inherit}
#universe{width:100%;height:100%}
#footerContent{font-family:sans-serif;font-size:110%;color:rgba(200,220,255,.3);width:100%;position:fixed;bottom:0px;padding:20px;text-align:center;z-index:20}
#footer{position:absolute;bottom:0px;height:300px;width:100%}
#scene{height:100%;position:absolute;left:50%;margin-left:-800px}
a{text-decoration:none;color:rgba(200,220,255,1);opacity:.4;transition:opacity .4s ease}
a:hover{opacity:1}
</style>
</head>
<body>
<div class="container">
<div class="content">
<canvas id="universe">
</canvas>
<div id="footer">
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<script>
window.requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;
var starDensity = .216;
var speedCoeff = .05;
var width;
var height;
var starCount;
var circleRadius;
var circleCenter;
var first = true;
var giantColor = '180,184,240';
var starColor = '226,225,142';
var cometColor = '226,225,224';
var canva = document.getElementById('universe');
var stars = [];
windowResizeHandler();
window.addEventListener('resize', windowResizeHandler, false);
createUniverse();
function createUniverse() {
universe = canva.getContext('2d');
for (var i = 0; i < starCount; i++) {
stars[i] = new Star();
stars[i].reset();
}
draw();
}
function draw() {
universe.clearRect(0, 0, width, height);
var starsLength = stars.length;
for (var i = 0; i < starsLength; i++) {
var star = stars[i];
star.move();
star.fadeIn();
star.fadeOut();
star.draw();
}
window.requestAnimationFrame(draw);
}
function Star() {
this.reset = function() {
this.giant = getProbability(3);
this.comet = this.giant || first ? false: getProbability(10);
this.x = getRandInterval(0, width - 10);
this.y = getRandInterval(0, height);
this.r = getRandInterval(1.1, 2.6);
this.dx = getRandInterval(speedCoeff, 6 * speedCoeff) + (this.comet + 1 - 1) * speedCoeff * getRandInterval(50, 120) + speedCoeff * 2;
this.dy = -getRandInterval(speedCoeff, 6 * speedCoeff) - (this.comet + 1 - 1) * speedCoeff * getRandInterval(50, 120);
this.fadingOut = null;
this.fadingIn = true;
this.opacity = 0;
this.opacityTresh = getRandInterval(.2, 1 - (this.comet + 1 - 1) * .4);
this.do = getRandInterval(0.0005, 0.002) + (this.comet + 1 - 1) * .001;
};
this.fadeIn = function() {
if (this.fadingIn) {
this.fadingIn = this.opacity > this.opacityTresh ? false: true;
this.opacity += this.do;
}
};
this.fadeOut = function() {
if (this.fadingOut) {
this.fadingOut = this.opacity < 0 ? false: true;
this.opacity -= this.do / 2;
if (this.x > width || this.y < 0) {
this.fadingOut = false;
this.reset();
}
}
};
this.draw = function() {
universe.beginPath();
if (this.giant) {
universe.fillStyle = 'rgba(' + giantColor + ',' + this.opacity + ')';
universe.arc(this.x, this.y, 2, 0, 2 * Math.PI, false);
} else if (this.comet) {
universe.fillStyle = 'rgba(' + cometColor + ',' + this.opacity + ')';
universe.arc(this.x, this.y, 1.5, 0, 2 * Math.PI, false);
//comet tail
for (var i = 0; i < 30; i++) {
universe.fillStyle = 'rgba(' + cometColor + ',' + (this.opacity - (this.opacity / 20) * i) + ')';
universe.rect(this.x - this.dx / 4 * i, this.y - this.dy / 4 * i - 2, 2, 2);
universe.fill();
}
} else {
universe.fillStyle = 'rgba(' + starColor + ',' + this.opacity + ')';
universe.rect(this.x, this.y, this.r, this.r);
}
universe.closePath();
universe.fill();
};
this.move = function() {
this.x += this.dx;
this.y += this.dy;
if (this.fadingOut === false) {
this.reset();
}
if (this.x > width - (width / 4) || this.y < 0) {
this.fadingOut = true;
}
};
(function() {
setTimeout(function() {
first = false;
},
50)
})()
}
function getProbability(percents) {
return ((Math.floor(Math.random() * 1000) + 1) < percents * 10);
}
function getRandInterval(min, max) {
return (Math.random() * (max - min) + min);
}
function windowResizeHandler() {
width = window.innerWidth;
height = window.innerHeight;
starCount = width * starDensity;
circleRadius = (width > height ? height / 2 : width / 2);
circleCenter = {
x: width / 2,
y: height / 2
}
canva.setAttribute('width', width);
canva.setAttribute('height', height);
}
</script>
</body>
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