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 1 /**
 2  * Copyright (c) 2016 hustcc
 3  * License: MIT
 4  * Version: v1.0.1
 5  * GitHub: https://github.com/hustcc/canvas-nest.js
 6 **/
 7 !
 8 function() {
 9     function n(n, e, t) {
10         return n.getAttribute(e) || t
11     }
12     function e(n) {
13         return document.getElementsByTagName(n)
14     }
15     function t() {
16         var t = e("script"),
17         o = t.length,
18         i = t[o - 1];
19         return {
20             l: o,
21             z: n(i, "zIndex", -1),
22             o: n(i, "opacity", .5),
23             c: n(i, "color", "0,0,0"),
24             n: n(i, "count", 99)
25         }
26     }
27     function o() {
28         a = m.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
29         c = m.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight
30     }
31     function i() {
32         r.clearRect(0, 0, a, c);
33         var n, e, t, o, m, l;
34         s.forEach(function(i, x) {
35             for (i.x += i.xa, i.y += i.ya, i.xa *= i.x > a || i.x < 0 ? -1 : 1, i.ya *= i.y > c || i.y < 0 ? -1 : 1, r.fillRect(i.x - .5, i.y - .5, 1, 1), e = x + 1; e < u.length; e++) n = u[e],
36             null !== n.x && null !== n.y && (o = i.x - n.x, m = i.y - n.y, l = o * o + m * m, l < n.max && (n === y && l >= n.max / 2 && (i.x -= .03 * o, i.y -= .03 * m), t = (n.max - l) / n.max, r.beginPath(), r.lineWidth = t / 2, r.strokeStyle = "rgba(" + d.c + "," + (t + .2) + ")", r.moveTo(i.x, i.y), r.lineTo(n.x, n.y), r.stroke()))
37         }),
38         x(i)
39     }
40     var a, c, u, m = document.createElement("canvas"),
41     d = t(),
42     l = "c_n" + d.l,
43     r = m.getContext("2d"),
44     x = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
45     function(n) {
46         window.setTimeout(n, 1e3 / 45)
47     },
48     w = Math.random,
49     y = {
50         x: null,
51         y: null,
52         max: 2e4
53     };
54     m.id = l,
55     m.style.cssText = "position:fixed;top:0;left:0;z-index:" + d.z + ";opacity:" + d.o,
56     e("body")[0].appendChild(m),
57     o(),
58     window.onresize = o,
59     window.onmousemove = function(n) {
60         n = n || window.event,
61         y.x = n.clientX,
62         y.y = n.clientY
63     },
64     window.onmouseout = function() {
65         y.x = null,
66         y.y = null
67     };
68     for (var s = [], f = 0; d.n > f; f++) {
69         var h = w() * a,
70         g = w() * c,
71         v = 2 * w() - 1,
72         p = 2 * w() - 1;
73         s.push({
74             x: h,
75             y: g,
76             xa: v,
77             ya: p,
78             max: 6e3
79         })
80     }
81     u = s.concat([y]),
82     setTimeout(function() {
83         i()
84     },
85     100)
86 } ();