canvas制作星空放射效果
canvas制作星空放射效果
background(document, window);/* eslint-disable new-cap */
/* eslint-disable no-unused-vars */
export function background(t, e) {
var n = t.getElementById('background');
if (!n.getContext) return !1;
var r = t.getElementById('tmp');
var i = {
create: function(e, t) {
for (var n in t) e.prototype[n] = t[n];
return e;
}, extend: function(e, t, n) {
t.prototype = new e();
var r = this.create(t, n);
r.prototype._super = function() {
e.apply(this, arguments);
};
for (var i in e.prototype) r.prototype['_super_' + i] = e.prototype[i];
return r;
}
};
var s = i.create(function() {
}, {
move: function() {
B[3] && (this.x = (this.x - a / 2) * Math.cos(B[3] * Math.PI / 180) - this.z * Math.sin(B[3] * Math.PI / 180) + a / 2, this.z = this.z * Math.cos(B[3] * Math.PI / 180) + (this.x - a / 2) * Math.sin(B[3] * Math.PI / 180));
B[2] ? this.z += B[2] : this.z -= 1;
B[2] = -13;
this.x += B[0] * 0.1;
this.y += B[1] * 0.1;
this.render();
}, render: function() {
}, reinit: function(e) {
this.create(e);
}, create: function(e) {
var t; var n; var r; var i = !1;
if (e === 1) this.type === 1 ? r = d : r = m; else if (e === 2) this.type === 1 ? r = v : r = g; else if (e === 3) {
t = this.x;
n = this.y;
r = this.z;
var s = (p + r) / p;
t < (1 - k) * a / 2 ? t = a * (s + 1) / 2 + C * Math.random() : t > a + (k - 1) * a / 2 && (t = a * (1 - s) / 2 - C * Math.random());
n < (1 - k) * f / 2 ? n = f * (s + 1) / 2 + C * Math.random() : n > f + (k - 1) * f / 2 && (n = f * (1 - s) / 2 - C * Math.random());
B[2] > 0 ? r = v : B[2] < 0 && (r = d);
} else this.type === 1 ? r = Math.random() * (d - v) + v : r = Math.random() * (m - g) + g;
if (e !== 3 || i) {
this.type === 1 ? (t = -a * (k - 1) / 2 + Math.random() * a * k, n = -f * (k - 1) / 2 + Math.random() * f * k) : this.t ? (t = Math.random() * (a - this.width), n = Math.random() * f) : (t = -a * (L - 1) / 2 + Math.random() * a * L, n = -f * (L - 1) / 2 + Math.random() * f * L);
}
this.x = t;
this.y = n;
this.z = r;
}
});
var o = i.extend(s, function() {
this.type = Math.random() < c ? 1 : 2;
this.create();
}, {
render: function() {
if (this.type === 1 && this.z < v || this.type === 2 && this.z < g) {
this.reinit(1);
return;
}
if (this.type === 1 && this.z > d || this.type === 2 && this.z > m) {
this.reinit(2);
return;
}
var e = p / (p + this.z); var t = a / 2 + (this.x - a / 2) * e; var n = f / 2 + (this.y - f / 2) * e;
if (t < 0 || t > a || n < 0 || n > f) return;
e = Math.round(e * 100) / 100;
var r = 0.8;
this.type === 1 ? this.z > d - 200 ? r = Math.round(d - this.z) * 0.8 / 200 : this.z < v + 100 && (r = Math.round(this.z - v) * 0.8 / 100) : this.z > m - 100 ? r = Math.round(m - this.z) * 0.8 / 100 : this.z < g + 50 && (r = Math.round(this.z - g) * 0.8 / 50);
var i = P.createRadialGradient(t, n, 0, t, n, this.r * e * (0.5 + 1 / this.type));
i.addColorStop(0, 'rgba(118,252,255,' + r + ')');
i.addColorStop(0.5, 'rgba(118,252,255,' + r + ')');
i.addColorStop(0.501, 'rgba(109,252,255,' + 0.75 * r + ')');
i.addColorStop(0.65, 'rgba(109,252,255,' + 0.2 * r + ')');
i.addColorStop(0.9, 'rgba(109,252,255,0)');
P.fillStyle = i;
P.beginPath();
P.arc(t, n, this.r * e * (0.5 + 1 / this.type), 0, Math.PI * 2, !0);
P.closePath();
P.fill();
}, create: function(e) {
this.imgData || (this._super_create(e), this.r = Math.random() * h[1] + h[0]);
}
});
var u = i.extend(s, function(e) {
this.type = 2;
this.create();
}, {
render: function() {
if (this.z < g) {
this.reinit(1);
return;
}
if (this.z > m) {
this.reinit(2);
return;
}
var e = p / (p + this.z); var n = a / 2 + (this.x - a / 2) * e; var r = f / 2 + (this.y - f / 2) * e;
e = Math.round(e * 100) / 100;
var i = 1; var s = !1;
this.z > m - 100 ? i = Math.round(m - this.z) / 200 : this.z < g + 50 && (i = Math.round(this.z - g) / 100);
var o = Math.round(this.width * e); var u = Math.round(this.height * e);
n + 15 * e < tt.x && n + 15 * e + o > tt.x && r - 18 * e < tt.y && r - 18 * e + u > tt.y && (tt.click ? (t.getElementById('input').value = this.t, t.getElementById('input-container').parentNode.submit(), U.clear(F)) : !tt.hover && tt.enable && (tt.hover = !0, s = !0));
var l = P.createRadialGradient(n, r, 0, n, r, 12 * e);
l.addColorStop(0, 'rgba(116,252,255,' + i + ')');
l.addColorStop(0.4, 'rgba(116,252,255,' + i + ')');
l.addColorStop(0.401, 'rgba(109,252,255,' + 0.75 * i + ')');
l.addColorStop(0.65, 'rgba(109,252,255,' + 0.2 * i + ')');
l.addColorStop(0.9, 'rgba(109,252,255,0)');
P.fillStyle = l;
P.beginPath();
P.arc(n, r, 12 * e, 0, Math.PI * 2, !0);
P.closePath();
P.fill();
s && (P.strokeStyle = 'rgba(117,252,255,0.4)', P.stroke());
var c = new Image();
c.src = this.imgData;
P.globalAlpha = 1;
s || (P.globalAlpha = i * 0.6);
try {
P.drawImage(c, 0, 0, c.width, c.height, n + 15 * e, r - 14 * e, Math.round(c.width * e), Math.round(c.height * e));
// eslint-disable-next-line no-empty
} catch (h) { }
P.globalAlpha = 1;
}, create: function(e) {
this._super_create(e);
this.t = O[Math.floor(Math.random() * D)];
// eslint-disable-next-line no-empty
var t = P.measureText(this.t);
H.clearRect(0, 0, 400, 400);
H.fillStyle = 'rgba(255,255,255,0.8)';
H.font = '24px Microsoft Yahei';
H.textBaseline = 'middle';
H.fillText(/* this.t*/'', 0, 12);
H.getImageData(0, 0, t.width, 24);
this.imgData = r.toDataURL('image/png');
this.width = t.width * 20 / 12;
this.height = 24;
H.clearRect(0, 0, 400, 400);
}
});
var a = Math.max(t.documentElement.clientWidth, 960);
var f = Math.max(t.documentElement.clientHeight, 500);
var l = 1.3;
var c = 0.99;
var h = [1, 5];
// p-d从小到大的直径
var p = 500;
var d = 2500;
var v = 0;
var m = 5000;
var g = 0;
// 点的覆盖率
var y = 500;
var b = 3e3;
var w = 300;
var E = 1e5;
var S = 8;
var x = 0.05;
var T = 200;
var N = 1;
var C = 100;
// 点的覆盖率
var k = (p + d) / p;
var L = (p + m) / p;
var A = [[0.25, 0.5, 300], [0.3, 0.3, 100], [0.18, 0.6, 100], [0.45, 0.5, 300], [0.55, 0.4, 100], [0.5, 0.75, 200], [0.6, 0.6, 200], [0.65, 0.5, 300], [0.7, 0.3, 200], [0.8, 0.7, 300]];
var O = ['graphene', 'amyloid peptide', 'ZnO', 'supercapacitor', 'big data', 'TiO', 'Graphene', 'MoS', 'nature', 'thermoelectric', 'microRNA', '\u5927\u6570\u636e', 'science', 'electrospinning', '\u7cd6\u5c3f\u75c5', 'autophagy', 'chitosan', 'social network', 'PM2.', 'urbanization', 'plos one', 'innovation', 'diabetes', '\u77f3\u58a8\u70ef', 'cloud computing', 'corporate social responsibility', 'biochar', 'remanufacturing', 'data mining', 'graphene oxide', 'carbon dots', 'social media', '\u7535\u5b50\u5546\u52a1', 'H7N', '\u4e91\u8ba1\u7b97', 'android', 'mycothiol', 'HPLC', 'internal control', 'miRNA', 'cancer', 'LiFePO', 'BiOCl', 'SERS', '\u03b2-carboline', 'face recognition', 'Cu2O', 'supply chain', 'upconversion', 'apoptosis', '\u9057\u4f20\u7b97\u6cd5', 'breast cancer', 'OLED', '\u4e92\u8054\u7f51\u91d1\u878d', '\u6570\u636e\u6316\u6398', '\u964d\u8840\u8102', 'Li4Ti5O', 'CZTS', 'Nanoparticles', 'Co3O', 'lncRNA', 'schizophrenia', '\u7269\u8054\u7f51', 'Fe3O', 'meta analysis', 'polyaniline', 'nano iron particles', 'human resource management', 'C3N', 'laccase', 'lung cancer', 'perovskite solar cell', 'BiVO', '\u7eb3\u7c73\u6750\u6599', 'Ag3PO', '\u795e\u7ecf\u7f51\u7edc', 'glutathione', 'project management', '\u57ce\u9547\u5316', '\u8f6c\u57fa\u56e0', '\u96fe\u973e', '\u5229\u7387\u5e02\u573a\u5316', 'metamaterial', 'BiFeO', 'hydrogel', 'mTOR', 'beta-Carboline', 'deep learning', 'ionic liquid', 'RNA-seq', 'FDI', 'Fe2O', '\u79bb\u5b50\u6db2\u4f53', 'phosphor', 'NaYF', 'WO', 'depression', 'hadoop', 'gas sensor', 'corporate governance', 'social capital', 'lignin', 'marketing strategy', 'microbial fuel cell', 'SnO', 'NiCo2O', 'Drosophila suzukii', 'leadership', 'In2O', 'SNP', '\u98df\u54c1\u5b89\u5168', 'DNA methylation', 'knowledge sharing', 'MnO', 'phenology', 'cell', 'reactive oxygen species', 'SVM', 'solar cell', 'shale gas', 'lithium ion battery', 'economic growth', '\u58f3\u805a\u7cd6', '\u80c3\u764c', 'LED', '\u4e73\u9178\u83cc', 'CdS', 'CeO', 'EST-SSR', 'game theory', 'communication', 'psychology', 'hyperspectral', 'induced pluripotent stem cells', 'mesoporous silica', 'photocatalysis', 'wavelet', '\u4e73\u817a\u764c', 'cancer stem cell', 'western blot', 'Li2MnO', 'LiMn2O', 'medium-chain triglycerides', 'Glycyrrhiza', 'plant DNA methylation', 'polysaccharide', 'quantum dot', 'image segmentation', 'iPS cells', 'dc motor control', 'RFID', 'Photocatalytic', 'RGD peptide', '\u51a0\u5fc3\u75c5', 'carbon nanotube', 'Biofuels', 'climate change', 'nanoparticles', 'emotion', 'memristor', 'DNA', '\u6570\u5b57\u6c34\u5370', 'CRISPR', 'pm2.5', 'PCR', 'presupposition', '\u80ba\u764c', 'WRKY', '\u9aa8\u8d28\u758f\u677e', 'shadow banking', 'cyclodextrin', 'inventory management', 'e-commerce', '\u751f\u6001\u6587\u660e', 'biodiesel', 'Ta2O', 'photocatalytic', 'crowdfunding', 'java', 'food safety', 'supply chain finance', 'carbon', 'nanowire', '\u65e0\u7ebf\u4f20\u611f\u5668\u7f51\u7edc', 'drought stress', 'online shopping', '\u9ad8\u8840\u538b', 'obesity', 'ELISA EIAab', 'risk management', 'carbon nanotubes', 'cellulose', 'perovskite', '\u5355\u7247\u673a', 'stress', 'ZnFe2O', '\u77f3\u659b', '\u809d\u764c', 'endophytic lichen', 'superhydrophobic', 'New Fermentation', '\u57ce\u5e02\u5316', '\u94c1\u76ae\u77f3\u659b', 'exosome', 'FTIR', 'finance', '\u4f9b\u5e94\u94fe', 'DGGE', 'performance management', 'TiO', 'nanotube', 'Bi2MoO', 'genetic algorithm', 'organizational culture', 'Science', 'thin film transistor', '\u9502\u79bb\u5b50\u7535\u6c60', 'protein', 'Corporate Social Responsibility', '\u86cb\u767d\u8d28\u7ec4\u5b66', 'DSSC', 'globalization', 'random lasing', 'stem cell', '\u592a\u9633\u80fd\u7535\u6c60', 'heavy metal', 'drought', 'O2O', 'entrepreneurship', 'venture capital', 'BiOBr', 'biofilm', 'LiCoO', 'LiMnPO', '\u8868\u9762\u6d3b\u6027\u5242', 'nanopore', 'neural network', 'supply chain management', 'auxin', 'biosensor', '\u78b3\u7eb3\u7c73\u7ba1', 'multiferroic', 'photoacoustic', '\u4f01\u4e1a\u793e\u4f1a\u8d23\u4efb', 'digital holography', '\u571f\u58e4\u547c\u5438', 'SSR', 'critical thinking', 'happiness', 'biomass', '\u69f2\u76ae\u7d20', '\u91cd\u91d1\u5c5e', 'optical limiting', 'VEGF', 'endophyte', 'MoO', '\u4e2d\u5c0f\u4f01\u4e1a\u878d\u8d44', 'oxygen reduction reaction', '\u751f\u7269\u591a\u6837\u6027', 'macrophage', '\u4ee3\u8c22\u7ec4\u5b66', 'network', 'Photosynthesis', 'Xanthoceras sorbifolia', 'g-C3N', 'soil respiration', 'anthocyanin', 'BaTiO', 'support vector machine', 'corporate culture', 'mesoporous', '\u4eba\u529b\u8d44\u6e90\u7ba1\u7406', '\u8d85\u7ea7\u7535\u5bb9\u5668', 'enzyme', 'soybean', '\u5149\u50ac\u5316', '\u5c42\u6b21\u5206\u6790\u6cd5', 'Li2FeSiO', '\u538b\u7f29\u611f\u77e5', '\u793e\u4ea4\u7f51\u7edc', 'autism', 'ethical leadership', 'promoter', 'GIS', 'liver fibrosis', '\u5bab\u9888\u764c', 'salt stress', 'angiogenesis', 'capital structure', '\u9875\u5ca9\u6c14', 'logistics', 'new media', '\u81ea\u53d1\u6027\u6c14\u80f8\u590d\u53d1', 'gas hydrate', 'dopamine'];
var M = [];
var D = O.length;
var P = n.getContext('2d');
var H = r.getContext('2d');
var B = [0, 0, 0, 0];
var j = !1;
var F;
var I;
var q;
var R = e.requestAnimationFrame || e.mozRequestAnimationFrame || e.webkitRequestAnimationFrame || e.msRequestAnimationFrame || e.oRequestAnimationFrame;
var U = {
stop: !1,
reg: function(e) {
R && !U.stop ? F = R(function() {
U.stop || (e(), F = R());
}) : F = setInterval(e, 17);
},
clear: function(e) {
R ? U.stop = !0 : clearInterval(e);
}
};
var z = function(e) {
var r = e ? 20 : 0;
n.setAttribute('width', a - r);
n.setAttribute('height', f - r);
I = Math.min(a * f / y, b);
for (var i = 0; i < I; i++)M.push(new o());
q = Math.min(a * f / E, S);
for (var s = 0; s < q; s++)M.push(new u());
U.reg(function() {
P.clearRect(0, 0, a, f);
j || (B[0] !== 0 && (B[0] = B[0] - Math.abs(B[0]) / B[0]), B[1] !== 0 && (B[1] = B[1] - Math.abs(B[1]) / B[1]), B[3] !== 0 && (B[3] = B[3] - 0.1 * Math.abs(B[3]) / B[3], Math.abs(B[3]) < 0.1 && (B[3] = 0)));
for (var e = M.length; e--;)M[e].r && e > I || M[e].move();
});
};
var Z;
var et = function() {
clearTimeout(Z);
Z = setTimeout(function() {
U.clear(F);
for (var e = M.length; e--;)M.pop();
z();
}, 400);
};
e.addEventListener('resize', et);
var tt = { x: 0, y: 0, hover: !1, click: !1, enable: !1 };
z(!0);
et();
}