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@snwfdhmp snwfdhmp/animated_bg.html
Last active May 13, 2017

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Animated background (credits : jack@greensock.com (more: see sources))
<!-- PLEASE GO TO LINE 10 FOR CREDITS -->
<div id='animated-background' class='animated-background'>
<canvas id='animated-background-canvas'></canvas>
</div>
<script>
/*!
* @author: Jack Doyle, jack@greensock.com
* @author: Erik Möller
* @author: Paul Irish
* @author: Tino Zijdel
*/
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s,n,r,a,o=this._time,l=this._duration,h=this._rawPrevTime;if(t>=l)this._totalTime=this._time=l,this.ratio=this._ease._calcEnd?this._ease.getRatio(1):1,this._reversed||(s=!0,n="onComplete"),0===l&&(this._initted||!this.vars.lazy||i)&&(this._startTime===this._timeline._duration&&(t=0),(0===t||0>h||h===_)&&h!==t&&(i=!0,h>_&&(n="onReverseComplete")),this._rawPrevTime=a=!e||t||h===t?t:_);else if(1e-7>t)this._totalTime=this._time=0,this.ratio=this._ease._calcEnd?this._ease.getRatio(0):0,(0!==o||0===l&&h>0&&h!==_)&&(n="onReverseComplete",s=this._reversed),0>t?(this._active=!1,0===l&&(this._initted||!this.vars.lazy||i)&&(h>=0&&(i=!0),this._rawPrevTime=a=!e||t||h===t?t:_)):this._initted||(i=!0);else if(this._totalTime=this._time=t,this._easeType){var u=t/l,f=this._easeType,m=this._easePower;(1===f||3===f&&u>=.5)&&(u=1-u),3===f&&(u*=2),1===m?u*=u:2===m?u*=u*u:3===m?u*=u*u*u:4===m&&(u*=u*u*u*u),this.ratio=1===f?1-u:2===f?u:.5>t/l?u/2:1-u/2}else this.ratio=this._ease.getRatio(t/l);if(this._time!==o||i){if(!this._initted){if(this._init(),!this._initted||this._gc)return;if(!i&&this._firstPT&&(this.vars.lazy!==!1&&this._duration||this.vars.lazy&&!this._duration))return this._time=this._totalTime=o,this._rawPrevTime=h,O.push(this),this._lazy=t,void 0;this._time&&!s?this.ratio=this._ease.getRatio(this._time/l):s&&this._ease._calcEnd&&(this.ratio=this._ease.getRatio(0===this._time?0:1))}for(this._lazy!==!1&&(this._lazy=!1),this._active||!this._paused&&this._time!==o&&t>=0&&(this._active=!0),0===o&&(this._startAt&&(t>=0?this._startAt.render(t,e,i):n||(n="_dummyGS")),this.vars.onStart&&(0!==this._time||0===l)&&(e||this.vars.onStart.apply(this.vars.onStartScope||this,this.vars.onStartParams||T))),r=this._firstPT;r;)r.f?r.t[r.p](r.c*this.ratio+r.s):r.t[r.p]=r.c*this.ratio+r.s,r=r._next;this._onUpdate&&(0>t&&this._startAt&&this._startTime&&this._startAt.render(t,e,i),e||(this._time!==o||s)&&this._onUpdate.apply(this.vars.onUpdateScope||this,this.vars.onUpdateParams||T)),n&&(!this._gc||i)&&(0>t&&this._startAt&&!this._onUpdate&&this._startTime&&this._startAt.render(t,e,i),s&&(this._timeline.autoRemoveChildren&&this._enabled(!1,!1),this._active=!1),!e&&this.vars[n]&&this.vars[n].apply(this.vars[n+"Scope"]||this,this.vars[n+"Params"]||T),0===l&&this._rawPrevTime===_&&a!==_&&(this._rawPrevTime=0))}},r._kill=function(t,e){if("all"===t&&(t=null),null==t&&(null==e||e===this.target))return this._lazy=!1,this._enabled(!1,!1);e="string"!=typeof e?e||this._targets||this.target:I.selector(e)||e;var i,s,n,r,a,o,l,h;if((m(e)||E(e))&&"number"!=typeof e[0])for(i=e.length;--i>-1;)this._kill(t,e[i])&&(o=!0);else{if(this._targets){for(i=this._targets.length;--i>-1;)if(e===this._targets[i]){a=this._propLookup[i]||{},this._overwrittenProps=this._overwrittenProps||[],s=this._overwrittenProps[i]=t?this._overwrittenProps[i]||{}:"all";break}}else{if(e!==this.target)return!1;a=this._propLookup,s=this._overwrittenProps=t?this._overwrittenProps||{}:"all"}if(a){l=t||a,h=t!==s&&"all"!==s&&t!==a&&("object"!=typeof t||!t._tempKill);for(n in l)(r=a[n])&&(r.pg&&r.t._kill(l)&&(o=!0),r.pg&&0!==r.t._overwriteProps.length||(r._prev?r._prev._next=r._next:r===this._firstPT&&(this._firstPT=r._next),r._next&&(r._next._prev=r._prev),r._next=r._prev=null),delete a[n]),h&&(s[n]=1);!this._firstPT&&this._initted&&this._enabled(!1,!1)}}return o},r.invalidate=function(){return this._notifyPluginsOfEnabled&&I._onPluginEvent("_onDisable",this),this._firstPT=null,this._overwrittenProps=null,this._onUpdate=null,this._startAt=null,this._initted=this._active=this._notifyPluginsOfEnabled=this._lazy=!1,this._propLookup=this._targets?{}:[],this},r._enabled=function(t,e){if(o||a.wake(),t&&this._gc){var i,s=this._targets;if(s)for(i=s.length;--i>-1;)this._siblings[i]=$(s[i],this,!0);else this._siblings=$(this.target,this,!0)}return C.prototype._enabled.call(this,t,e),this._notifyPluginsOfEnabled&&this._firstPT?I._onPluginEvent(t?"_onEnable":"_onDisable",this):!1},I.to=function(t,e,i){return new I(t,e,i)},I.from=function(t,e,i){return i.runBackwards=!0,i.immediateRender=0!=i.immediateRender,new I(t,e,i)},I.fromTo=function(t,e,i,s){return s.startAt=i,s.immediateRender=0!=s.immediateRender&&0!=i.immediateRender,new I(t,e,s)},I.delayedCall=function(t,e,i,s,n){return new I(e,0,{delay:t,onComplete:e,onCompleteParams:i,onCompleteScope:s,onReverseComplete:e,onReverseCompleteParams:i,onReverseCompleteScope:s,immediateRender:!1,useFrames:n,overwrite:0})},I.set=function(t,e){return new I(t,0,e)},I.getTweensOf=function(t,e){if(null==t)return[];t="string"!=typeof t?t:I.selector(t)||t;var i,s,n,r;if((m(t)||E(t))&&"number"!=typeof t[0]){for(i=t.length,s=[];--i>-1;)s=s.concat(I.getTweensOf(t[i],e));for(i=s.length;--i>-1;)for(r=s[i],n=i;--n>-1;)r===s[n]&&s.splice(i,1)}else for(s=$(t).concat(),i=s.length;--i>-1;)(s[i]._gc||e&&!s[i].isActive())&&s.splice(i,1);return s},I.killTweensOf=I.killDelayedCallsTo=function(t,e,i){"object"==typeof e&&(i=e,e=!1);for(var s=I.getTweensOf(t,e),n=s.length;--n>-1;)s[n]._kill(i,t)};var J=v("plugins.TweenPlugin",function(t,e){this._overwriteProps=(t||"").split(","),this._propName=this._overwriteProps[0],this._priority=e||0,this._super=J.prototype},!0);if(r=J.prototype,J.version="1.10.1",J.API=2,r._firstPT=null,r._addTween=function(t,e,i,s,n,r){var a,o;return null!=s&&(a="number"==typeof s||"="!==s.charAt(1)?Number(s)-i:parseInt(s.charAt(0)+"1",10)*Number(s.substr(2)))?(this._firstPT=o={_next:this._firstPT,t:t,p:e,s:i,c:a,f:"function"==typeof t[e],n:n||e,r:r},o._next&&(o._next._prev=o),o):void 0},r.setRatio=function(t){for(var e,i=this._firstPT,s=1e-6;i;)e=i.c*t+i.s,i.r?e=Math.round(e):s>e&&e>-s&&(e=0),i.f?i.t[i.p](e):i.t[i.p]=e,i=i._next},r._kill=function(t){var e,i=this._overwriteProps,s=this._firstPT;if(null!=t[this._propName])this._overwriteProps=[];else for(e=i.length;--e>-1;)null!=t[i[e]]&&i.splice(e,1);for(;s;)null!=t[s.n]&&(s._next&&(s._next._prev=s._prev),s._prev?(s._prev._next=s._next,s._prev=null):this._firstPT===s&&(this._firstPT=s._next)),s=s._next;return!1},r._roundProps=function(t,e){for(var i=this._firstPT;i;)(t[this._propName]||null!=i.n&&t[i.n.split(this._propName+"_").join("")])&&(i.r=e),i=i._next},I._onPluginEvent=function(t,e){var i,s,n,r,a,o=e._firstPT;if("_onInitAllProps"===t){for(;o;){for(a=o._next,s=n;s&&s.pr>o.pr;)s=s._next;(o._prev=s?s._prev:r)?o._prev._next=o:n=o,(o._next=s)?s._prev=o:r=o,o=a}o=e._firstPT=n}for(;o;)o.pg&&"function"==typeof o.t[t]&&o.t[t]()&&(i=!0),o=o._next;return i},J.activate=function(t){for(var e=t.length;--e>-1;)t[e].API===J.API&&(U[(new t[e])._propName]=t[e]);return!0},d.plugin=function(t){if(!(t&&t.propName&&t.init&&t.API))throw"illegal plugin definition.";var e,i=t.propName,s=t.priority||0,n=t.overwriteProps,r={init:"_onInitTween",set:"setRatio",kill:"_kill",round:"_roundProps",initAll:"_onInitAllProps"},a=v("plugins."+i.charAt(0).toUpperCase()+i.substr(1)+"Plugin",function(){J.call(this,i,s),this._overwriteProps=n||[]},t.global===!0),o=a.prototype=new J(i);o.constructor=a,a.API=t.API;for(e in r)"function"==typeof t[e]&&(o[r[e]]=t[e]);return a.version=t.version,J.activate([a]),a},s=t._gsQueue){for(n=0;s.length>n;n++)s[n]();for(r in p)p[r].func||t.console.log("GSAP encountered missing dependency: com.greensock."+r)}o=!1}})("undefined"!=typeof module&&module.exports&&"undefined"!=typeof global?global:this||window,"TweenLite");
var _gsScope = "undefined" != typeof module && module.exports && "undefined"!=typeof global ? global : this || window;
(_gsScope._gsQueue || (_gsScope._gsQueue=[])).push(
function()
{
"use strict";
_gsScope._gsDefine(
"easing.Back",
["easing.Ease"],
function(t)
{
var e,
i,
s,
r = _gsScope.GreenSockGlobals || _gsScope,
n = r.com.greensock,
a = 2*Math.PI,
o = Math.PI/2,
h = n._class,
l = function(e,i)
{
var s = h("easing."+e, function(){}, !0),
r = s.prototype = new t;
return r.constructor = s, r.getRatio=i, s
},
_ = t.register || function(){},
u = function(t,e,i,s)
{
var r = h(
"easing."+t,
{
easeOut:new e,
easeIn:new i,
easeInOut:new s
},
!0
);
return _(r,t),
r
},
c = function(t,e,i)
{
this.t = t,
this.v = e,
i && (
this.next = i,
i.prev = this,
this.c = i.v-e,
this.gap = i.t-t
)
},
p = function(e,i)
{
var s = h
(
"easing."+e,
function(t)
{
this._p1 = t || 0===t ? t : 1.70158,
this._p2 = 1.525*this._p1
},
!0
),
r = s.prototype = new t;
return r.constructor = s,
r.getRatio = i,
r.config = function(t)
{
return new s(t)
},
s
},
f = u
(
"Back",
p
(
"BackOut",
function(t)
{
return (t-=1)*t*((this._p1+1)*t+this._p1)+1
}
),
p
(
"BackIn",
function(t)
{
return t*t*((this._p1+1)*t-this._p1)
}
),
p
(
"BackInOut",
function(t)
{
return 1>(t*=2) ? .5*t*t*((this._p2+1)*t-this._p2) : .5*((t-=2)*t*((this._p2+1)*t+this._p2)+2)
}
)
),
m = h
(
"easing.SlowMo",
function(t,e,i)
{
e = e || 0===e ? e : .7,
null == t ? t=.7 : t>1&&(t=1),
this._p = 1 !== t ? e : 0,
this._p1 = (1-t)/2,
this._p2 = t,
this._p3 = this._p1+this._p2,
this._calcEnd = i=== !0
},
!0
),
d = m.prototype = new t;
return d.constructor = m,
d.getRatio = function(t)
{
var e = t+(.5-t)*this._p;
return this._p1 > t ? this._calcEnd ? 1-(t=1-t/this._p1)*t : e-(t=1-t/this._p1)*t*t*t*e : t>this._p3?this._calcEnd ? 1-(t=(t-this._p3)/this._p1)*t : e+(t-e)*(t=(t-this._p3)/this._p1)*t*t*t : this._calcEnd?1 : e
},
m.ease = new m(.7,.7),
d.config = m.config = function(t,e,i)
{
return new m(t,e,i)
},
e = h
(
"easing.SteppedEase",
function(t)
{
t=t || 1,
this._p1 = 1/t,
this._p2 = t+1
},
!0
),
d = e.prototype = new t,
d.constructor = e,
d.getRatio = function(t)
{
return 0>t ? t=0 : t>=1&&(t=.999999999),
(this._p2*t>>0)*this._p1
},
d.config = e.config = function(t)
{
return new e(t)
},
i = h
(
"easing.RoughEase",
function(e)
{
e = e||{};
for
(
var i,
s,
r,
n,
a,
o,
h = e.taper||"none",
l = [],
_ = 0,
u = 0|(e.points||20),
p = u,
f = e.randomize !== !1,
m = e.clamp === !0,
d = e.template instanceof t ? e.template : null,
g = "number" == typeof e.strength ? .4*e.strength : .4
;
--p > -1
;
)
i = f ? Math.random() : 1/u*p,
s = d ? d.getRatio(i) : i,
"none" === h ? r=g : "out" === h ? (n=1-i , r=n*n*g) : "in" === h ? r = i*i*g : .5 > i ? (n=2*i , r=.5*n*n*g) : (n=2*(1-i) , r=.5*n*n*g),
f ? s+=Math.random()*r-.5*r : p%2 ? s+=.5*r : s-=.5*r,
m && (s>1 ? s=1 : 0 > s && (s = 0)),
l[_++] = {x:i , y:s};
for
(
l.sort
(
function(t,e)
{
return t.x-e.x
}
),
o = new c
(
1,
1,
null
),
p=u
;
--p > -1
;
)
a = l[p],
o = new c
(
a.x,
a.y,
o
);
this._prev = new c
(
0,
0,
0 !== o.t ? o : o.next
)
},
!0
),
d = i.prototype = new t,
d.constructor = i,
d.getRatio = function(t)
{
var e = this._prev;
if(t>e.t)
{
for
(
;
e.next && t >= e.t
;
)
e = e.next;
e = e.prev
}
else for(;
e.prev&&e.t>=t;
)e=e.prev;
return this._prev=e,e.v+(t-e.t)/e.gap*e.c},d.config=function(t){return new i(t)},i.ease=new i,u("Bounce",l("BounceOut",function(t){return 1/2.75>t?7.5625*t*t:2/2.75>t?7.5625*(t-=1.5/2.75)*t+.75:2.5/2.75>t?7.5625*(t-=2.25/2.75)*t+.9375:7.5625*(t-=2.625/2.75)*t+.984375}),l("BounceIn",function(t){return 1/2.75>(t=1-t)?1-7.5625*t*t:2/2.75>t?1-(7.5625*(t-=1.5/2.75)*t+.75):2.5/2.75>t?1-(7.5625*(t-=2.25/2.75)*t+.9375):1-(7.5625*(t-=2.625/2.75)*t+.984375)}),l("BounceInOut",function(t){var e=.5>t;
return t=e?1-2*t:2*t-1,t=1/2.75>t?7.5625*t*t:2/2.75>t?7.5625*(t-=1.5/2.75)*t+.75:2.5/2.75>t?7.5625*(t-=2.25/2.75)*t+.9375:7.5625*(t-=2.625/2.75)*t+.984375,e?.5*(1-t):.5*t+.5})),u("Circ",l("CircOut",function(t){return Math.sqrt(1-(t-=1)*t)}),l("CircIn",function(t){return-(Math.sqrt(1-t*t)-1)}),l("CircInOut",function(t){return 1>(t*=2)?-.5*(Math.sqrt(1-t*t)-1):.5*(Math.sqrt(1-(t-=2)*t)+1)})),s=function(e,i,s){var r=h("easing."+e,function(t,e){this._p1=t||1,this._p2=e||s,this._p3=this._p2/a*(Math.asin(1/this._p1)||0)},!0),n=r.prototype=new t;
return n.constructor=r,n.getRatio=i,n.config=function(t,e){return new r(t,e)},r},u("Elastic",s("ElasticOut",function(t){return this._p1*Math.pow(2,-10*t)*Math.sin((t-this._p3)*a/this._p2)+1},.3),s("ElasticIn",function(t){return-(this._p1*Math.pow(2,10*(t-=1))*Math.sin((t-this._p3)*a/this._p2))},.3),s("ElasticInOut",function(t){return 1>(t*=2)?-.5*this._p1*Math.pow(2,10*(t-=1))*Math.sin((t-this._p3)*a/this._p2):.5*this._p1*Math.pow(2,-10*(t-=1))*Math.sin((t-this._p3)*a/this._p2)+1},.45)),u("Expo",l("ExpoOut",function(t){return 1-Math.pow(2,-10*t)}),l("ExpoIn",function(t){return Math.pow(2,10*(t-1))-.001}),l("ExpoInOut",function(t){return 1>(t*=2)?.5*Math.pow(2,10*(t-1)):.5*(2-Math.pow(2,-10*(t-1)))})),u("Sine",l("SineOut",function(t){return Math.sin(t*o)}),l("SineIn",function(t){return-Math.cos(t*o)+1}),l("SineInOut",function(t){return-.5*(Math.cos(Math.PI*t)-1)})),h("easing.EaseLookup",{find:function(e){return t.map[e]}},!0),_(r.SlowMo,"SlowMo","ease,"),_(i,"RoughEase","ease,"),_(e,"SteppedEase","ease,"),f},!0)}),_gsScope._gsDefine&&_gsScope._gsQueue.pop()();
(function() {
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
|| window[vendors[x]+'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function(callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function() { callback(currTime + timeToCall); },
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function(id) {
clearTimeout(id);
};
}());
(function() {
var width, height, largeHeader, canvas, ctx, points, target, animateHeader = true;
// Main
initHeader();
initAnimation();
addListeners();
function initHeader() {
width = window.innerWidth;
height = window.innerHeight;
target = {x: width/2, y: height/2};
largeHeader = document.getElementById('animated-background');
largeHeader.style.height = height+'px';
canvas = document.getElementById('animated-background-canvas');
canvas.width = width;
canvas.height = height;
ctx = canvas.getContext('2d');
// create points
points = [];
for(var x = 0; x < width; x = x + width/20) {
for(var y = 0; y < height; y = y + height/20) {
var px = x + Math.random()*width/20;
var py = y + Math.random()*height/20;
var p = {x: px, originX: px, y: py, originY: py };
points.push(p);
}
}
// for each point find the 5 closest points
for(var i = 0; i < points.length; i++) {
var closest = [];
var p1 = points[i];
for(var j = 0; j < points.length; j++) {
var p2 = points[j]
if(!(p1 == p2)) {
var placed = false;
for(var k = 0; k < 5; k++) {
if(!placed) {
if(closest[k] == undefined) {
closest[k] = p2;
placed = true;
}
}
}
for(var k = 0; k < 5; k++) {
if(!placed) {
if(getDistance(p1, p2) < getDistance(p1, closest[k])) {
closest[k] = p2;
placed = true;
}
}
}
}
}
p1.closest = closest;
}
// assign a circle to each point
for(var i in points) {
var c = new Circle(points[i], 2+Math.random()*2, 'rgba(255,255,255,0.3)');
points[i].circle = c;
}
}
// Event handling
function addListeners() {
if(!('ontouchstart' in window)) {
window.addEventListener('mousemove', mouseMove);
}
window.addEventListener('scroll', scrollCheck);
window.addEventListener('resize', resize);
}
function mouseMove(e) {
target.x = e.x;
target.y = e.y;
}
function scrollCheck() {
animateHeader = true;
}
function resize() {
width = window.innerWidth;
height = window.innerHeight;
largeHeader.style.height = height+'px';
canvas.width = width;
canvas.height = height;
}
// animation
function initAnimation() {
animate();
for(var i in points) {
shiftPoint(points[i]);
}
}
function animate() {
if(animateHeader) {
ctx.clearRect(0,0,width,height);
for(var i in points) {
// detect points in range
if(Math.abs(getDistance(target, points[i])) < 4000) {
points[i].active = 0.3;
points[i].circle.active = 0.6;
} else if(Math.abs(getDistance(target, points[i])) < 20000) {
points[i].active = 0.1;
points[i].circle.active = 0.3;
} else if(Math.abs(getDistance(target, points[i])) < 40000) {
points[i].active = 0.02;
points[i].circle.active = 0.1;
} else {
points[i].active = 0;
points[i].circle.active = 0;
}
drawLines(points[i]);
points[i].circle.draw();
}
}
requestAnimationFrame(animate);
}
function shiftPoint(p) {
TweenLite.to(p, 1+1*Math.random(), {x:p.originX-50+Math.random()*100,
y: p.originY-50+Math.random()*100, ease:Circ.easeInOut,
onComplete: function() {
shiftPoint(p);
}});
}
// Canvas manipulation
function drawLines(p) {
if(!p.active) return;
for(var i in p.closest) {
ctx.beginPath();
ctx.moveTo(p.x, p.y);
ctx.lineTo(p.closest[i].x, p.closest[i].y);
ctx.strokeStyle = 'rgba(156,217,249,'+ p.active+')';
ctx.stroke();
}
}
function Circle(pos,rad,color) {
var _this = this;
// constructor
(function() {
_this.pos = pos || null;
_this.radius = rad || null;
_this.color = color || null;
})();
this.draw = function() {
if(!_this.active) return;
ctx.beginPath();
ctx.arc(_this.pos.x, _this.pos.y, _this.radius, 0, 2 * Math.PI, false);
ctx.fillStyle = 'rgba(156,217,249,'+ _this.active+')';
ctx.fill();
};
}
// Util
function getDistance(p1, p2) {
return Math.pow(p1.x - p2.x, 2) + Math.pow(p1.y - p2.y, 2);
}
})();
</script>
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