var canvasBg={
|
defaults : {
|
type:-1
|
},
|
init: function(options) {
|
var opts = $.extend(canvasBg.defaults, options);
|
if(opts.type==-1){
|
//随机
|
var num=Math.floor(Math.random()*3);
|
opts.type=num;
|
}
|
if(opts.type==0){
|
canvasBg.canvas0();
|
}else if(opts.type==1){
|
canvasBg.canvas1();
|
}else if(opts.type==2){
|
canvasBg.canvas2();
|
}else{
|
canvasBg.canvas0();
|
}
|
},
|
canvas0: function() {
|
var a = document.getElementById("bg-canvas"),
|
b = document.documentElement.clientWidth,
|
c = document.documentElement.clientHeight;
|
a.width = b,
|
a.height = c;
|
var d = a.getContext("2d");
|
d.strokeStyle = "#f6f6f6",
|
d.lineWidth = 1,
|
d.beginPath(),
|
d.translate(.5, .5);
|
for (var e = 20; e <= c; e += 20) d.moveTo(0, e),
|
d.lineTo(b, e);
|
for (var e = 20; e <= b; e += 20) d.moveTo(e, 0),
|
d.lineTo(e, c);
|
d.closePath(),
|
d.stroke()
|
},
|
canvas1: function() {
|
var canvas = document.getElementById('bg-canvas'),
|
ctx = canvas.getContext('2d'),
|
w = canvas.width = window.innerWidth,
|
h = canvas.height = window.innerHeight,
|
hue = 217,
|
stars = [],
|
count = 0,
|
maxStars = 1200;
|
|
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;
|
}
|
|
function maxOrbit(x, y) {
|
var max = Math.max(x, y),
|
diameter = Math.round(Math.sqrt(max * max + max * max));
|
return diameter / 2;
|
}
|
|
var Star = function () {
|
|
this.orbitRadius = random(maxOrbit(w, h));
|
this.radius = random(60, this.orbitRadius) / 12;
|
this.orbitX = w / 2;
|
this.orbitY = h / 2;
|
this.timePassed = random(0, maxStars);
|
this.speed = random(this.orbitRadius) / 900000;
|
this.alpha = random(2, 10) / 10;
|
|
count++;
|
stars[count] = this;
|
}
|
|
Star.prototype.draw = function () {
|
var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
|
y = Math.cos(this.timePassed) * this.orbitRadius + 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();
|
|
},
|
canvas2: function() {
|
document.body.style="margin:1px;height: 100%;background-image: -webkit-radial-gradient(ellipse farthest-corner at center top, #000d4d 0%, #000105 100%); background-image: radial-gradient(ellipse farthest-corner at center top, #000d4d 0%, #000105 100%);";
|
var num = 200;
|
var w = window.innerWidth;
|
var h = window.innerHeight;
|
var max = 100;
|
var _x = 0;
|
var _y = 0;
|
var _z = 150;
|
var dtr = function (d) {
|
return d * Math.PI / 180;
|
};
|
|
var rnd = function () {
|
return Math.sin(Math.floor(Math.random() * 360) * Math.PI / 180);
|
};
|
var dist = function (p1, p2, p3) {
|
return Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2) + Math.pow(p2.z - p1.z, 2));
|
};
|
|
var cam = {
|
obj: {
|
x: _x,
|
y: _y,
|
z: _z
|
},
|
dest: {
|
x: 0,
|
y: 0,
|
z: 1
|
},
|
dist: {
|
x: 0,
|
y: 0,
|
z: 200
|
},
|
ang: {
|
cplane: 0,
|
splane: 0,
|
ctheta: 0,
|
stheta: 0
|
},
|
zoom: 1,
|
disp: {
|
x: w / 2,
|
y: h / 2,
|
z: 0
|
},
|
upd: function () {
|
cam.dist.x = cam.dest.x - cam.obj.x;
|
cam.dist.y = cam.dest.y - cam.obj.y;
|
cam.dist.z = cam.dest.z - cam.obj.z;
|
cam.ang.cplane = -cam.dist.z / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
|
cam.ang.splane = cam.dist.x / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z);
|
cam.ang.ctheta = Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.z * cam.dist.z) / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
|
cam.ang.stheta = -cam.dist.y / Math.sqrt(cam.dist.x * cam.dist.x + cam.dist.y * cam.dist.y + cam.dist.z * cam.dist.z);
|
}
|
};
|
|
var trans = {
|
parts: {
|
sz: function (p, sz) {
|
return {
|
x: p.x * sz.x,
|
y: p.y * sz.y,
|
z: p.z * sz.z
|
};
|
},
|
rot: {
|
x: function (p, rot) {
|
return {
|
x: p.x,
|
y: p.y * Math.cos(dtr(rot.x)) - p.z * Math.sin(dtr(rot.x)),
|
z: p.y * Math.sin(dtr(rot.x)) + p.z * Math.cos(dtr(rot.x))
|
};
|
},
|
y: function (p, rot) {
|
return {
|
x: p.x * Math.cos(dtr(rot.y)) + p.z * Math.sin(dtr(rot.y)),
|
y: p.y,
|
z: -p.x * Math.sin(dtr(rot.y)) + p.z * Math.cos(dtr(rot.y))
|
};
|
},
|
z: function (p, rot) {
|
return {
|
x: p.x * Math.cos(dtr(rot.z)) - p.y * Math.sin(dtr(rot.z)),
|
y: p.x * Math.sin(dtr(rot.z)) + p.y * Math.cos(dtr(rot.z)),
|
z: p.z
|
};
|
}
|
},
|
pos: function (p, pos) {
|
return {
|
x: p.x + pos.x,
|
y: p.y + pos.y,
|
z: p.z + pos.z
|
};
|
}
|
},
|
pov: {
|
plane: function (p) {
|
return {
|
x: p.x * cam.ang.cplane + p.z * cam.ang.splane,
|
y: p.y,
|
z: p.x * -cam.ang.splane + p.z * cam.ang.cplane
|
};
|
},
|
theta: function (p) {
|
return {
|
x: p.x,
|
y: p.y * cam.ang.ctheta - p.z * cam.ang.stheta,
|
z: p.y * cam.ang.stheta + p.z * cam.ang.ctheta
|
};
|
},
|
set: function (p) {
|
return {
|
x: p.x - cam.obj.x,
|
y: p.y - cam.obj.y,
|
z: p.z - cam.obj.z
|
};
|
}
|
},
|
persp: function (p) {
|
return {
|
x: p.x * cam.dist.z / p.z * cam.zoom,
|
y: p.y * cam.dist.z / p.z * cam.zoom,
|
z: p.z * cam.zoom,
|
p: cam.dist.z / p.z
|
};
|
},
|
disp: function (p, disp) {
|
return {
|
x: p.x + disp.x,
|
y: -p.y + disp.y,
|
z: p.z + disp.z,
|
p: p.p
|
};
|
},
|
steps: function (_obj_, sz, rot, pos, disp) {
|
var _args = trans.parts.sz(_obj_, sz);
|
_args = trans.parts.rot.x(_args, rot);
|
_args = trans.parts.rot.y(_args, rot);
|
_args = trans.parts.rot.z(_args, rot);
|
_args = trans.parts.pos(_args, pos);
|
_args = trans.pov.plane(_args);
|
_args = trans.pov.theta(_args);
|
_args = trans.pov.set(_args);
|
_args = trans.persp(_args);
|
_args = trans.disp(_args, disp);
|
return _args;
|
}
|
};
|
|
(function () {
|
|
var threeD = function (param) {
|
this.transIn = {};
|
this.transOut = {};
|
this.transIn.vtx = (param.vtx);
|
this.transIn.sz = (param.sz);
|
this.transIn.rot = (param.rot);
|
this.transIn.pos = (param.pos);
|
};
|
|
threeD.prototype.vupd = function () {
|
this.transOut = trans.steps(
|
this.transIn.vtx,
|
this.transIn.sz,
|
this.transIn.rot,
|
this.transIn.pos,
|
cam.disp
|
);
|
};
|
|
var Build = function () {
|
this.vel = 0.04;
|
this.lim = 360;
|
this.diff = 200;
|
this.initPos = 100;
|
this.toX = _x;
|
this.toY = _y;
|
this.go();
|
};
|
|
Build.prototype.go = function () {
|
this.canvas = document.getElementById("bg-canvas");
|
this.canvas.width = window.innerWidth;
|
this.canvas.height = window.innerHeight;
|
this.$ = this.canvas.getContext("2d");
|
this.$.globalCompositeOperation = 'source-over';
|
this.varr = [];
|
this.dist = [];
|
this.calc = [];
|
|
for (var i = 0, len = num; i < len; i++) {
|
this.add();
|
}
|
|
this.rotObj = {
|
x: 0,
|
y: 0,
|
z: 0
|
};
|
this.objSz = {
|
x: w / 5,
|
y: h / 5,
|
z: w / 5
|
};
|
};
|
|
Build.prototype.add = function () {
|
this.varr.push(new threeD({
|
vtx: {
|
x: rnd(),
|
y: rnd(),
|
z: rnd()
|
},
|
sz: {
|
x: 0,
|
y: 0,
|
z: 0
|
},
|
rot: {
|
x: 20,
|
y: -20,
|
z: 0
|
},
|
pos: {
|
x: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
|
y: this.diff * Math.sin(360 * Math.random() * Math.PI / 180),
|
z: this.diff * Math.sin(360 * Math.random() * Math.PI / 180)
|
}
|
}));
|
this.calc.push({
|
x: 360 * Math.random(),
|
y: 360 * Math.random(),
|
z: 360 * Math.random()
|
});
|
};
|
|
Build.prototype.upd = function () {
|
cam.obj.x += (this.toX - cam.obj.x) * 0.05;
|
cam.obj.y += (this.toY - cam.obj.y) * 0.05;
|
};
|
|
Build.prototype.draw = function () {
|
this.$.clearRect(0, 0, this.canvas.width, this.canvas.height);
|
cam.upd();
|
this.rotObj.x += 0.1;
|
this.rotObj.y += 0.1;
|
this.rotObj.z += 0.1;
|
|
for (var i = 0; i < this.varr.length; i++) {
|
for (var val in this.calc[i]) {
|
if (this.calc[i].hasOwnProperty(val)) {
|
this.calc[i][val] += this.vel;
|
if (this.calc[i][val] > this.lim) this.calc[i][val] = 0;
|
}
|
}
|
|
this.varr[i].transIn.pos = {
|
x: this.diff * Math.cos(this.calc[i].x * Math.PI / 180),
|
y: this.diff * Math.sin(this.calc[i].y * Math.PI / 180),
|
z: this.diff * Math.sin(this.calc[i].z * Math.PI / 180)
|
};
|
this.varr[i].transIn.rot = this.rotObj;
|
this.varr[i].transIn.sz = this.objSz;
|
this.varr[i].vupd();
|
if (this.varr[i].transOut.p < 0) continue;
|
var g = this.$.createRadialGradient(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p, this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2);
|
this.$.globalCompositeOperation = 'lighter';
|
g.addColorStop(0, 'hsla(255, 255%, 255%, 1)');
|
g.addColorStop(.5, 'hsla(' + (i + 2) + ',85%, 40%,1)');
|
g.addColorStop(1, 'hsla(' + (i) + ',85%, 40%,.5)');
|
this.$.fillStyle = g;
|
this.$.beginPath();
|
this.$.arc(this.varr[i].transOut.x, this.varr[i].transOut.y, this.varr[i].transOut.p * 2, 0, Math.PI * 2, false);
|
this.$.fill();
|
this.$.closePath();
|
}
|
};
|
Build.prototype.anim = function () {
|
window.requestAnimationFrame = (function () {
|
return window.requestAnimationFrame ||
|
function (callback, element) {
|
window.setTimeout(callback, 1000 / 60);
|
};
|
})();
|
var anim = function () {
|
this.upd();
|
this.draw();
|
window.requestAnimationFrame(anim);
|
}.bind(this);
|
window.requestAnimationFrame(anim);
|
};
|
|
Build.prototype.run = function () {
|
this.anim();
|
|
window.addEventListener('mousemove', function (e) {
|
this.toX = (e.clientX - this.canvas.width / 2) * -0.8;
|
this.toY = (e.clientY - this.canvas.height / 2) * 0.8;
|
}.bind(this));
|
window.addEventListener('touchmove', function (e) {
|
e.preventDefault();
|
this.toX = (e.touches[0].clientX - this.canvas.width / 2) * -0.8;
|
this.toY = (e.touches[0].clientY - this.canvas.height / 2) * 0.8;
|
}.bind(this));
|
window.addEventListener('mousedown', function (e) {
|
for (var i = 0; i < 100; i++) {
|
this.add();
|
}
|
}.bind(this));
|
window.addEventListener('touchstart', function (e) {
|
e.preventDefault();
|
for (var i = 0; i < 100; i++) {
|
this.add();
|
}
|
}.bind(this));
|
};
|
var app = new Build();
|
app.run();
|
})();
|
window.addEventListener('resize', function () {
|
canvas.width = w = window.innerWidth;
|
canvas.height = h = window.innerHeight;
|
}, false);
|
}
|
}
|
