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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<title>北林I/O</title>
<meta name="description" content="Innovation in the Open.">
<style>
body {
background-color: #000;
color: #fff;
margin: 0;
padding: 0;
}
#constellation {
position: absolute;
z-index: -1;
}
#facade {
border: 1px solid #fff;
box-sizing: border-box;
display: none;
margin: 0 auto;
padding: 80px 0;
position: absolute;
text-align: center;
width: 500px;
}
#facade h1,
#facade p {
line-height: 1;
margin: 0;
}
#facade h1 {
font-size: 50px;
}
#facade p {
font-size: 24px;
margin-top: 36px;
}
@media screen and (max-width: 600px) {
#facade {
width: calc(100% - 20px);
}
#facade h1 {
font-size: 40px;
}
#facade p {
font-size: 16px;
}
}
</style>
</head>
<body>
<canvas id="constellation"></canvas>
<div id="facade">
<h1>北林I/O</h1>
<p>2016-03-21 至 2016-06-08</p>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
(function($, window) {
function Constellation(canvas, options) {
var $canvas = $(canvas);
var context = canvas.getContext("2d");
var config = $.extend(true, {}, {
star: {
color: "rgba(255, 255, 255, .5)",
width: 2,
randomWidth: true,
},
line: {
color: "rgba(255, 255, 255, .5)",
width: 0.2,
},
position: {
x: 0,
y: 0,
},
width: window.innerWidth,
height: window.innerHeight,
velocity: 0.1,
length: window.innerWidth > 800 ? 100 : 50,
distance: 120,
radius: 250,
stars: [],
}, options);
function Star() {
this.x = Math.random() * canvas.width;
this.y = Math.random() * canvas.height;
this.vx = (config.velocity - (Math.random() * 0.5));
this.vy = (config.velocity - (Math.random() * 0.5));
this.radius = config.star.randomWidth ? (Math.random() * config.star.width) : config.star.width;
}
Star.prototype = {
create: function() {
context.beginPath();
context.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
context.fill();
},
animate: function() {
for (var i = 0; i < config.length; i++) {
var star = config.stars[i];
if (star.y < 0 || star.y > canvas.height) {
star.vx = star.vx;
star.vy = -star.vy;
} else if (star.x < 0 || star.x > canvas.width) {
star.vx = -star.vx;
star.vy = star.vy;
}
star.x += star.vx;
star.y += star.vy;
}
},
line: function() {
for (var i = 0; i < config.length; i++) {
for (var j = 0; j < config.length; j++) {
var iStar = config.stars[i];
var jStar = config.stars[j];
if (
(iStar.x - jStar.x) < config.distance &&
(iStar.y - jStar.y) < config.distance &&
(iStar.x - jStar.x) > -config.distance &&
(iStar.y - jStar.y) > -config.distance &&
(iStar.x - config.position.x) < config.radius &&
(iStar.y - config.position.y) < config.radius &&
(iStar.x - config.position.x) > -config.radius &&
(iStar.y - config.position.y) > -config.radius
) {
context.beginPath();
context.moveTo(iStar.x, iStar.y);
context.lineTo(jStar.x, jStar.y);
context.stroke();
context.closePath();
}
}
}
},
};
this.createStars = function() {
context.clearRect(0, 0, canvas.width, canvas.height);
for (var i = 0; i < config.length; i++) {
config.stars.push(new Star());
config.stars[i].create();
}
config.stars[config.length - 1].animate();
config.stars[config.length - 1].line();
};
this.setCanvas = function() {
canvas.width = config.width;
canvas.height = config.height;
};
this.setContext = function() {
context.fillStyle = config.star.color;
context.strokeStyle = config.line.color;
context.lineWidth = config.line.width;
};
this.setInitialPosition = function() {
if (!options || !options.hasOwnProperty("position")) {
config.position = {
x: canvas.width * 0.5,
y: canvas.height * 0.5,
};
}
};
this.loop = function(callback) {
callback();
window.requestAnimationFrame(function() {
this.loop(callback);
}.bind(this));
};
this.bind = function() {
$canvas.on("mousemove", function(e) {
config.position.x = e.pageX - $canvas.offset().left;
config.position.y = e.pageY - $canvas.offset().top;
});
};
this.init = function() {
this.setCanvas();
this.setContext();
this.setInitialPosition();
this.loop(this.createStars);
this.bind();
};
}
$.fn.constellation = function(options) {
return this.each(function() {
(new Constellation(this, options)).init();
});
};
})($, window);
$(document).ready(function() {
$(window).resize();
});
$(window).resize(function() {
$("#facade").hide();
$("#facade").css({
top: ($(window).height() - $("#facade").outerHeight()) / 2 + $(document).scrollTop(),
left: ($(window).width() - $("#facade").outerWidth()) / 2,
});
$("#facade").show();
$("canvas#constellation").constellation();
});
</script>
</body>
</html>