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⚡ Electric SVG Loader ⚡

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HTML

            
              <svg class="electric-loader" viewBox="0 0 100 100">
  <defs>
    <filter id="goo">
      <feGaussianBlur in="SourceGraphic" stdDeviation="4" result="blur" />
      <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 17 -2.15"  result="goo" />
      <feComposite in="SourceGraphic" in2="goo" operator="over" />
    </filter>
  </defs>
  <g filter="url(#goo)"></g>
</svg>
!

CSS

            
              .electric-loader {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  margin: auto;
  width: 80%;
  width: 80vw;
  height: auto;
  max-width: 600px;
}

.electric-loader path { 
  fill: none;
  stroke: #A5F2E7; 
  stroke-width: 0.6; 

  stroke-dasharray: 300;
  stroke-dashoffset: -300;
  
  animation: 
    stroke-anim 2s steps(40) infinite, 
    stroke-color 0.6s steps(10)  alternate infinite;
}

@keyframes stroke-anim { to { stroke-dashoffset: 0; } }
@keyframes stroke-color { to { stroke: #49BEB7; } }

html { height: 100%; width: 100%; background: #000; }
!

JS

            
              console.clear();

var svgns = "http://www.w3.org/2000/svg";
var twoPI = Math.PI * 2;

function ElectricLine(radius = 48, startOffset = 0){

  var path = document.createElementNS(svgns, 'path');

  var coords = [];
  var centerX = 50;
  var centerY = 50;

  for (var i = 0; i <= twoPI + 0.1; i += 0.1 ){
    coords.push( 
      centerX + ( Math.sin( i + startOffset ) * radius ), 
      centerY + ( Math.cos( i + startOffset ) * radius )
    );
  }

  // Slightly randomize the points
  function updateElectricLine(){
    path.setAttribute(
      'd', 
      coords.map((point,i)=>{ 
        return ( 
          i == 0 ? 'M' : 
          i % 2 == 0 ? 'L' : 
          ',' 
        )
         + Math.round( ( point + Math.random() * 3 ) * 100 ) / 100 
      }).join('')); 
  }

  path.style.animationDelay = '0s, ' + ( -Math.random() ) + 's';
  //path.style.animationDuration = (1.5 + Math.random()) + 's, ' + 0.2 + ( Math.random() * 0.4 ) + 's';

  updateElectricLine();

  // Have to get it in the dom for `getTotalLength` to work
  var tempSVG = document.createElementNS(svgns, 'svg');
  tempSVG.appendChild(path);
  document.body.appendChild(tempSVG);

  // Get the line length
  var length = path.getTotalLength();
  document.body.removeChild(tempSVG);

  // Set an accurate strokeDasharray & offset for the animation
  path.style.strokeDasharray = length/2; //( length * 0.48 ) + ' ' + ( length * 0.52 );
  path.style.strokeDashoffset = -length;

  return {
    el: path,
    update: updateElectricLine
  }
}


var lines = [
  new ElectricLine( 35 , Math.PI * 0.0 ),
  new ElectricLine( 34.5 , Math.PI * 1.0 ),
  new ElectricLine( 34 , Math.PI * 0.25 ),
  new ElectricLine( 33.5 , Math.PI * 1.25),
  new ElectricLine( 33 , Math.PI * 0.5 ),
  new ElectricLine( 32.5 , Math.PI * 1.5 )
];

var svg = document.querySelector('.electric-loader g');
lines.forEach( line => { svg.appendChild(line.el); });

var t = 0;
function update(){
  requestAnimationFrame(update);
  if ( t % 7 == 0 ) { 
    lines.forEach( line => { line.update(); })
  }
  t++;
}

update();
!
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