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<title>html5 canvas炫酷旋转银河系星空背景特效</title>
<link rel="stylesheet" type="text/css" href="css/normalize.css" />
<link rel="stylesheet" type="text/css" href="css/htmleaf-demo.css">
<style type="text/css">
body {
background: #060e1b;
overflow: hidden;
}
</style>
</head>
<body>
<div class="htmleaf-container">
<header class="htmleaf-header">
<h1>html5 canvas炫酷旋转银河系星空背景特效 <span>Galaxy Effect</span></h1>
<div class="htmleaf-links">
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</div>
</header>
<canvas id="canvas"></canvas>
</div>
<script type="text/javascript">
"use strict";
var canvas = document.getElementById('canvas'),
ctx = canvas.getContext('2d'),
w = canvas.width = window.innerWidth,
h = canvas.height = window.innerHeight,
hue = 217,
stars = [],
count = 0,
maxStars = 1400;
// Thanks @jackrugile for the performance tip! http://codepen.io/jackrugile/pen/BjBGoM
// Cache gradient
var canvas2 = document.createElement('canvas'),
ctx2 = canvas2.getContext('2d');
canvas2.width = 100;
canvas2.height = 100;
var half = canvas2.width/2,
gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
gradient2.addColorStop(0.025, '#fff');
gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
gradient2.addColorStop(1, 'transparent');
ctx2.fillStyle = gradient2;
ctx2.beginPath();
ctx2.arc(half, half, half, 0, Math.PI * 2);
ctx2.fill();
// End cache
function random(min, max) {
if (arguments.length < 2) {
max = min;
min = 0;
}
if (min > max) {
var hold = max;
max = min;
min = hold;
}
return Math.floor(Math.random() * (max - min + 1)) + min;
}
var Star = function() {
this.orbitRadius = random(w / 2 - 50);
this.radius = random(100, this.orbitRadius) / 10;
this.orbitX = w / 2;
this.orbitY = h / 2;
this.timePassed = random(0, maxStars);
this.speed = random(this.orbitRadius) / 100000;
this.alpha = random(2, 10) / 10;
count++;
stars[count] = this;
}
Star.prototype.draw = function() {
var x = Math.sin(this.timePassed + 1) * this.orbitRadius + this.orbitX,
y = Math.cos(this.timePassed) * this.orbitRadius/2 + this.orbitY,
twinkle = random(10);
if (twinkle === 1 && this.alpha > 0) {
this.alpha -= 0.05;
} else if (twinkle === 2 && this.alpha < 1) {
this.alpha += 0.05;
}
ctx.globalAlpha = this.alpha;
ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
this.timePassed += this.speed;
}
for (var i = 0; i < maxStars; i++) {
new Star();
}
function animation() {
ctx.globalCompositeOperation = 'source-over';
ctx.globalAlpha = 0.8;
ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 1)';
ctx.fillRect(0, 0, w, h)
ctx.globalCompositeOperation = 'lighter';
for (var i = 1, l = stars.length; i < l; i++) {
stars[i].draw();
};
window.requestAnimationFrame(animation);
}
animation();
</script>
</body>
</html>
html5 canvas炫酷旋转银河系星空背景特效源码.zip
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2022-11-03
23:37:48
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html5 canvas炫酷旋转银河系星空背景特效源码.zip （7个子文件） 
132687032657962278 html5canvas_yhx css 
htmleaf-demo.css 6KB normalize.css 2KB fonts icomoon.woff 1KB
icomoon.svg 2KB icomoon.eot 2KB icomoon.ttf 1KB
index.html 4KB资源评论
