A Pen by Michael Shapiro

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This awesome code was written by shapiromichael, you can see more from this user in the personal repository.
You can find the original code on Codepen.io
Copyright shapiromichael ©
  • HTML
  • CSS
  • JavaScript
<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  <title>A Pen by  Michael Shapiro</title>
  
  
  
      <link rel="stylesheet" href="css/style.css">

  
</head>

<body>

  <div id="container"></div>
  
  

    <script  src="js/index.js"></script>




</body>

</html>

/*Downloaded from https://www.codeseek.co/shapiromichael/a-pen-by-michael-shapiro-aBDAo */
html, body {
  background: #222;
}

/*Downloaded from https://www.codeseek.co/shapiromichael/a-pen-by-michael-shapiro-aBDAo */
window.onload = goodStuff;

function goodStuff () {
    var circles = [];

    var COLORS = [
        //'#B1BE86', '#EADA8C', '#D0837D', '#24679B', '#03374C',
        'rgba(255,255,255,.05)'
    ];

    var ONE_RAD = Math.PI / 180;

    var Circle = Class.extend({
        
        init : function () {
            this.x = 0.0;
            this.y = 0.0;
            this.radius = 1;
            this.color = 'red';

            this.force = 0.0;
            this.theta = random(TWO_PI);

            this.vx = 0.0;  // vector x
            this.vy = 0.0;  // vector y
            this.va = ONE_RAD; // vector angle

            this.reverse = false;
        },
      
        move : function () {
            this.vx = Math.sin(this.theta) * this.force;
            this.vy = Math.cos(this.theta) * this.force;

            if (this.reverse) {
                this.force -= 0.015;
                this.radius *= 0.995;
            } 
            else {
                this.force += 0.015;
                this.radius *= 1.005;
            }

            this.x += this.vx; 
            this.y += this.vy;

            this.theta += this.va;

            if (Math.abs(this.force) > 2) {
                this.reverse = !this.reverse;
            }
        },
      
        draw : function (ctx) {
            ctx.beginPath();
            ctx.arc( this.x, this.y, this.radius, 0, TWO_PI );
            ctx.fillStyle = this.color;
            ctx.fill();
        }
    })

    var pad = Sketch.create({
        container : document.getElementById('container'),
    });
  
    pad.update = function () {    
        var i, m, circle;

        for (i = 0, m = circles.length; i < m; i++) {
            circle = circles[i];            
            circle.move();
        }
    };

    pad.draw = function () {
        var i, m;

        pad.globalCompositeOperation  = 'lighter';

        for (i = 0, m = circles.length; i < m; i++) {
          circles[i].draw(pad);
        }
  
        if(circles.length <= 100) {
          pad.addOne();
        }
    }

    pad.addOne = function () {
      var circle = new Circle();
      
      circle.init();
      circle.x = pad.width / 2;
      circle.y = pad.height / 2;
      circle.va = random(ONE_RAD, ONE_RAD * 3);
      circle.force = random(-2, 5);
      circle.radius = random(1, 6);
      circle.color = random(COLORS);
      circles.push( circle );
    };
}

//////////////////////////////
//////// Dependencies ////////
//////////////////////////////

/* Simple JavaScript Inheritance
 * By John Resig http://ejohn.org/
 * MIT Licensed.
 */
// Inspired by base2 and Prototype
(function(){
  var initializing = false, fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;
 
  // The base Class implementation (does nothing)
  this.Class = function(){};
 
  // Create a new Class that inherits from this class
  Class.extend = function(prop) {
    var _super = this.prototype;
   
    // Instantiate a base class (but only create the instance,
    // don't run the init constructor)
    initializing = true;
    var prototype = new this();
    initializing = false;
   
    // Copy the properties over onto the new prototype
    for (var name in prop) {
      // Check if we're overwriting an existing function
      prototype[name] = typeof prop[name] == "function" &&
        typeof _super[name] == "function" && fnTest.test(prop[name]) ?
        (function(name, fn){
          return function() {
            var tmp = this._super;
           
            // Add a new ._super() method that is the same method
            // but on the super-class
            this._super = _super[name];
           
            // The method only need to be bound temporarily, so we
            // remove it when we're done executing
            var ret = fn.apply(this, arguments);        
            this._super = tmp;
           
            return ret;
          };
        })(name, prop[name]) :
        prop[name];
    }
   
    // The dummy class constructor
    function Class() {
      // All construction is actually done in the init method
      if ( !initializing && this.init )
        this.init.apply(this, arguments);
    }
   
    // Populate our constructed prototype object
    Class.prototype = prototype;
   
    // Enforce the constructor to be what we expect
    Class.prototype.constructor = Class;
 
    // And make this class extendable
    Class.extend = arguments.callee;
   
    return Class;
  };
})();

/* Copyright (C) 2013 Justin Windle, https://soulwire.co.uk */
var Sketch=function(){"use strict";function e(e){return"[object Array]"==Object.prototype.toString.call(e)}function t(e){return"function"==typeof e}function n(e){return"number"==typeof e}function o(e){return"string"==typeof e}function r(e){return E[e]||String.fromCharCode(e)}function i(e,t,n){for(var o in t)(n||!e.hasOwnProperty(o))&&(e[o]=t[o]);return e}function u(e,t){return function(){e.apply(t,arguments)}}function a(e){var n={};for(var o in e)n[o]=t(e[o])?u(e[o],e):e[o];return n}function c(e){function n(n){t(n)&&n.apply(e,[].splice.call(arguments,1))}function u(e){for(_=0;_<J.length;_++)G=J[_],o(G)?O[(e?"add":"remove")+"EventListener"].call(O,G,k,!1):t(G)?k=G:O=G}function c(){L(T),T=I(c),U||(n(e.setup),U=t(e.setup),n(e.resize)),e.running&&!j&&(e.dt=(B=+new Date)-e.now,e.millis+=e.dt,e.now=B,n(e.update),e.autoclear&&K&&e.clear(),n(e.draw)),j=++j%e.interval}function l(){O=Y?e.style:e.canvas,D=Y?"px":"",e.fullscreen&&(e.height=w.innerHeight,e.width=w.innerWidth),O.height=e.height+D,O.width=e.width+D,e.retina&&K&&X&&(O.height=e.height*X,O.width=e.width*X,O.style.height=e.height+"px",O.style.width=e.width+"px",e.scale(X,X)),U&&n(e.resize)}function s(e,t){return N=t.getBoundingClientRect(),e.x=e.pageX-N.left-w.scrollX,e.y=e.pageY-N.top-w.scrollY,e}function f(t,n){return s(t,e.element),n=n||{},n.ox=n.x||t.x,n.oy=n.y||t.y,n.x=t.x,n.y=t.y,n.dx=n.x-n.ox,n.dy=n.y-n.oy,n}function g(e){if(e.preventDefault(),W=a(e),W.originalEvent=e,W.touches)for(M.length=W.touches.length,_=0;_<W.touches.length;_++)M[_]=f(W.touches[_],M[_]);else M.length=0,M[0]=f(W,V);return i(V,M[0],!0),W}function h(t){for(t=g(t),q=(Q=J.indexOf(z=t.type))-1,e.dragging=/down|start/.test(z)?!0:/up|end/.test(z)?!1:e.dragging;q;)o(J[q])?n(e[J[q--]],t):o(J[Q])?n(e[J[Q++]],t):q=0}function p(t){F=t.keyCode,H="keyup"==t.type,Z[F]=Z[r(F)]=!H,n(e[t.type],t)}function v(t){e.autopause&&("blur"==t.type?b:C)(),n(e[t.type],t)}function C(){e.now=+new Date,e.running=!0}function b(){e.running=!1}function P(){(e.running?b:C)()}function A(){K&&e.clearRect(0,0,e.width,e.height)}function S(){R=e.element.parentNode,_=x.indexOf(e),R&&R.removeChild(e.element),~_&&x.splice(_,1),u(!1),b()}var T,k,O,R,N,_,D,B,G,W,z,F,H,q,Q,j=0,M=[],U=!1,X=w.devicePixelRatio,Y=e.type==m,K=e.type==d,V={x:0,y:0,ox:0,oy:0,dx:0,dy:0},J=[e.element,h,"mousedown","touchstart",h,"mousemove","touchmove",h,"mouseup","touchend",h,"click",y,p,"keydown","keyup",w,v,"focus","blur",l,"resize"],Z={};for(F in E)Z[E[F]]=!1;return i(e,{touches:M,mouse:V,keys:Z,dragging:!1,running:!1,millis:0,now:0/0,dt:0/0,destroy:S,toggle:P,clear:A,start:C,stop:b}),x.push(e),e.autostart&&C(),u(!0),l(),c(),e}for(var l,s,f="E LN10 LN2 LOG2E LOG10E PI SQRT1_2 SQRT2 abs acos asin atan ceil cos exp floor log round sin sqrt tan atan2 pow max min".split(" "),g="__hasSketch",h=Math,d="canvas",p="webgl",m="dom",y=document,w=window,x=[],v={fullscreen:!0,autostart:!0,autoclear:!0,autopause:!0,container:y.body,interval:1,globals:!0,retina:!1,type:d},E={8:"BACKSPACE",9:"TAB",13:"ENTER",16:"SHIFT",27:"ESCAPE",32:"SPACE",37:"LEFT",38:"UP",39:"RIGHT",40:"DOWN"},C={CANVAS:d,WEB_GL:p,WEBGL:p,DOM:m,instances:x,install:function(t){if(!t[g]){for(var o=0;o<f.length;o++)t[f[o]]=h[f[o]];i(t,{TWO_PI:2*h.PI,HALF_PI:h.PI/2,QUATER_PI:h.PI/4,random:function(t,o){return e(t)?t[~~(h.random()*t.length)]:(n(o)||(o=t||1,t=0),t+h.random()*(o-t))},lerp:function(e,t,n){return e+n*(t-e)},map:function(e,t,n,o,r){return(e-t)/(n-t)*(r-o)+o}}),t[g]=!0}},create:function(e){return e=i(e||{},v),e.globals&&C.install(self),l=e.element=e.element||y.createElement(e.type===m?"div":"canvas"),s=e.context=e.context||function(){switch(e.type){case d:return l.getContext("2d",e);case p:return l.getContext("webgl",e)||l.getContext("experimental-webgl",e);case m:return l.canvas=l}}(),e.container.appendChild(l),C.augment(s,e)},augment:function(e,t){return t=i(t||{},v),t.element=e.canvas||e,t.element.className+=" sketch",i(e,t,!0),c(e)}},b=["ms","moz","webkit","o"],P=self,A=0,S="AnimationFrame",T="request"+S,k="cancel"+S,I=P[T],L=P[k],O=0;O<b.length&&!I;O++)I=P[b[O]+"Request"+S],L=P[b[O]+"Cancel"+T];return P[T]=I=I||function(e){var t=+new Date,n=h.max(0,16-(t-A)),o=setTimeout(function(){e(t+n)},n);return A=t+n,o},P[k]=L=L||function(e){clearTimeout(e)},C}();

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