<div class="title">
    <h3>PLASM.it - 2017</h3>
    <h1>ALIEN</h1>
    <h3>Deviation of microcosm</h3>
  </div>
  <div class="more-pens">
    <a target="_blank" href="https://codepen.io/plasm/" class="white-mode">VIEW OTHER PENS</a>
    <a target="_blank" href="https://codepen.io/collection/nZpPbz/" class="white-mode">VIEW OTHER PARTICLES</a>
  </div>

@import url('https://fonts.googleapis.com/css?family=Montserrat:200,300,400,600')
.more-pens
  position: fixed
  left: 20px
  bottom: 20px
  z-index: 10
  font-family: "Montserrat"
  font-size: 12px

a.white-mode, a.white-mode:link, a.white-mode:visited, a.white-mode:active
  font-family: "Montserrat"
  font-size: 12px
  text-decoration: none
  background: #212121
  padding: 4px 8px
  color: #f7f7f7
  &:hover
    background: #edf3f8
    color: #212121

body
  margin: 0
  padding: 0
  overflow: hidden
  width: 100%
  height: 100%
  background: #000000


.title
  z-index: 10
  position: absolute
  left: 50%
  top: 50%
  transform: translateX(-50%) translateY(-50%)
  font-family: "Montserrat"
  text-align: center
  width: 100%
  h1
    position: relative
    color: #EEEEEE
    font-weight: 600
    font-size: 60px
    padding: 0
    margin: 0
    line-height: 1
    text-shadow: 0 0 30px #000155

    span
      font-weight: 600
      padding: 0
      margin: 0
      color: #BBB

  h3
    font-weight: 200
    font-size: 20px
    padding: 0
    margin: 0
    line-height: 1
    color: #EEEEEE
    letter-spacing: 2px
    text-shadow: 0 0 30px #000155

let max_particles = 1000

var tela = document.createElement('canvas');
    tela.width = $(window).width();
    tela.height = $(window).height();
    $("body").append(tela);

var canvas = tela.getContext('2d');

class Particle{
  constructor(canvas, progress){
    let random = Math.random()
    this.progress = 0;
    this.canvas = canvas;

    this.x = ($(window).width()/2)  + (Math.random()*200 - Math.random()*200)
    this.y = ($(window).height()/2) + (Math.random()*200 - Math.random()*200)
    this.s = Math.random() * 1;
    this.a = 0
    this.w = $(window).width()
    this.h = $(window).height()
    this.radius = random > .2 ? Math.random()*1 : Math.random()*3
    this.color  = random > .2 ? "#2E4765" : "#b5ff00"
    this.radius = random > .8 ? Math.random()*2 : this.radius
    this.color  = random > .8 ? "#2E4765" : this.color

    // this.color  = random > .1 ? "#ffae00" : "#f0ff00" // Alien
    this.variantx1 = Math.random()*300
    this.variantx2 = Math.random()*400
    this.varianty1 = Math.random()*100
    this.varianty2 = Math.random()*120
  }

  render(){
    this.canvas.beginPath();
    this.canvas.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
    this.canvas.lineWidth = 2;
    this.canvas.fillStyle = this.color;
    this.canvas.fill();
    this.canvas.closePath();
  }

  move(){
    this.x += Math.cos(this.a) * this.s;
    this.y += Math.sin(this.a) * this.s;
    this.a += Math.random() * 0.8 - 0.4;

    if(this.x < 0 || this.x > this.w - this.radius){
      return false
    }

    if(this.y < 0 || this.y > this.h - this.radius){
      return false
    }
    this.render()
    this.progress++
    return true
  }
}

let particles = []
let init_num  = popolate(max_particles)
function popolate(num){
  for (var i = 0; i < num; i++) {
    setTimeout(
      function(){
        particles.push(new Particle(canvas, i))
      }.bind(this)
    ,i*20)
  }
  return particles.length
}

function clear(){
  canvas.globalAlpha=0.05;
  canvas.fillStyle='#000155';
  canvas.fillStyle='#000021'; // Alien
  canvas.fillRect(0, 0, tela.width, tela.height);
  canvas.globalAlpha=1;
}

function update(){
  particles = particles.filter(function(p) {
    return p.move()
  })
  if(particles.length < init_num){
    popolate(1)
  }
  clear();
  requestAnimationFrame(update.bind(this))
}
update()