Particles write text

index.html

<div class="title">
    <h3>A N O T H E R <strong>C O D E P E N</strong></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>

particles-write-text.markdown

Particles write text

A Pen by pedro on CodePen.

License.

script.babel

let particles = [];
let frequency = -1;
let p_n = 0;
let sig = 1;
// Popolate particles
setInterval(
  function(){
    popolate()
  }.bind(this),
  frequency
)

let c1 = createCanvas({width: $(window).width(), height: $(window).height()})
let c2 = createCanvas({width: $(window).width(), height: $(window).height()})
let c3 = createCanvas({width: $(window).width(), height: $(window).height()})

let tela   = c1.canvas;
let canvas = c1.context;

// $("body").append(tela);
$("body").append(c3.canvas);
writeText(c2.canvas, c2.context, "QUANTA\nPLÁSTICOS")


class Particle{
  constructor(canvas, options){
    let random = Math.random()
    this.canvas = canvas;
    this.x = options.x
    this.y = options.y
    this.s = (3 + Math.random());
    this.a = 0
    this.w = $(window).width()
    this.h = $(window).height()
    this.radius = 0.5 + Math.random()*20
    this.color  = this.randomColor(p_n += sig)
  }

  randomColor(rad) {
    
    console.log(rad)
    
    let colors = ["#808080", "#877979","#8e7273","#956b6c",
                 "#9d6365","#a45c5f", "#ab5558","#b24e51",
                  "#b9474b", "#c13f44", "#c8383d","#cf3137",
                  "#d62a30"
                 ];
    if(Math.abs(p_n) == colors.length - 1) {
      sig *= -1;
    }
    return colors[colors.length -1]
    //return colors[this.randomIntFromInterval(0,colors.length-1)];
  }

  randomIntFromInterval(min,max){
      return Math.floor(Math.random()*(max-min+1)+min);
  }

  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.swapColor()
    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()
    return true
  }
}

function createCanvas(properties){
  let canvas = document.createElement('canvas');
      canvas.width = properties.width;
      canvas.height = properties.height;
  let context = canvas.getContext('2d');
  return {
    canvas: canvas,
    context: context
  }
}

function writeText(canvas, context, text){
  let size = 100
  context.font = size + "px Montserrat";
  context.fillStyle = "#111111";
  context.textAlign = "center";
  let lineheight = 70
  let lines = text.split('\n');
  for(let i = 0; i<lines.length; i++){
    context.fillText(lines[i], canvas.width/2, canvas.height/2 + lineheight*i - (lineheight*(lines.length-1))/3);
  }
}

function maskCanvas(){
  c3.context.drawImage(c2.canvas, 0, 0, c2.canvas.width, c2.canvas.height);
  c3.context.globalCompositeOperation = 'source-atop';
  c3.context.drawImage(c1.canvas, 0, 0);
  blur(c1.context,c1.canvas, 2)
}

function blur(ctx,canvas, amt) {
  ctx.filter = `blur(${amt}px)`
  ctx.drawImage(canvas, 0, 0)
  ctx.filter = 'none'
}


/*
 * Function to clear layer canvas
 * @num:number number of particles
 */
function popolate(){
  particles.push(
    new Particle(canvas,{
      x: ($(window).width()/2),
      y: ($(window).height()/2)
    })
  )
  return particles.length
}

function clear(){
  canvas.globalAlpha=0.03;
  canvas.fillStyle='#111111';
  canvas.fillRect(0, 0, tela.width, tela.height);
  canvas.globalAlpha=1;
}

function update(){
  clear();
  particles = particles.filter(function(p) {
    return p.move()
  })
  maskCanvas()
  requestAnimationFrame(update.bind(this))
}

update()

scripts

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>

style.sass

@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: #111111


.title
  z-index: 10
  position: absolute
  left: 50%
  top: 50%
  height: 250px
  transform: translateX(-50%) translateY(-50%)
  font-family: "Montserrat"
  text-align: center
  width: 100%


  h3
    position: absolute
    bottom: 0
    width: 100%
    text-align: center
    font-weight: 200
    font-size: 20px
    padding: 0
    margin: 0
    line-height: 1
    color: #EEEEEE
    letter-spacing: 2px