<canvas resize="true" id="canvas"></canvas>

<!-- I wrote the code in paperscript, but could not find a way to use in codepen, so the js code is up here. -->

<script resize="true" type="text/paperscript" canvas="canvas">
  ////////////
  // CLASSES
  ////////////
  function Hex(position, targetRadius, color) {
      var subs = 3;

      this.radius = targetRadius;
      this.sides = randomIndex([4, 6, 8, 10, 12]);
      this.targetHex = new Path.RegularPolygon(position, this.sides, targetRadius);
      this.paths = [];

      for (var i = 0; i < subs; i++) {
          var h = new Path.RegularPolygon(position, this.sides, 0);

          if (i === 0) {
              h.strokeColor = color;
          }
          else {
              h.strokeColor = new Color({
                  hue:color.hue,
                  saturation:color.saturation,
                  lightness:randomRange(0.4, 0.6),
                  alpha:1
              });
          }

          h.strokeWidth = 24;
          h.shadowBlur = 64;
          h.shadowColor = h.strokeColor;

          this.paths.push(h);
      }

      this.color = this.paths[subs - 1].strokeColor;

      this.speed = 125;
  }
  Hex.prototype = {
      animate:function() {
          var tl = new TimelineMax({
              onComplete:function() {
                  this.paths.forEach(function(p) {
                      p.remove();
                  });
              },
              onCompleteScope:this
          });

          var duration = this.radius / this.speed,
              offset = 0,
              ease = Cubic.easeOut;

          this.paths.forEach(function(h) {
              var from, to;

              for (var i = 0; i < h.segments.length; i++) {
                  from = h.segments[i].point;
                  to = this.targetHex.segments[i].point;

                  tl.to(from, duration, {x:to.x, y:to.y, ease:ease}, offset);
                  tl.to(h, duration, {strokeWidth:0, ease:ease}, offset);
              }

              offset += 0.2;

          }, this);

          return tl;
      }
  };

  function Line(start, angle, length, color) {
      this.start = start;
      this.end = new Point();

      this.end.setAngle(angle);
      this.end.setLength(length);
      this.end += this.start;

      this.path = new Path();
      this.path.add(this.start, this.end);
      this.color = this.path.strokeColor = color;
      this.path.visible = false;
      this.path.strokeWidth = 2;
      this.path.strokeCap = 'round';
      this.path.shadowBlur = 32;
      this.path.shadowColor = this.color;

      this.speed = 250;
  }
  Line.prototype = {
      animate:function() {
          var tl = new TimelineMax({
              onStart:function() {
                  this.path.visible = true;
              },
              onStartScope:this,
              onComplete:function() {
                  this.path.remove();
              },
              onCompleteScope:this
          });

          var start = this.path.segments[0].point,
              end = this.path.segments[1].point;

          var duration = this.path.length / this.speed,
              ease = Cubic;

          tl.from(end, duration, {x:start.x, y:start.y, ease:ease.easeInOut});
          tl.to(start, duration * 0.75, {x:end.x, y:end.y, ease:ease.easeOut}, '-=0.5');

          return tl;
      }
  };

  function createFirework() {
      var tl = new TimelineMax();

      var startPoint = new Point(view.size.width * Math.random(), view.size.height),
          angle = 270,
          length = view.size.height * 0.5,
          size = randomRange(64, 396),
          color = getRandomColor();

      var trail = new Line(startPoint, angle, length, color),
          hex = new Hex(trail.end, size, color);

      tl.add(trail.animate());
      tl.add('trailDone');

      tl.add(hex.animate(), 'trailDone');

      for (var i = 0; i < hex.sides; i++) {

          var point = hex.targetHex.segments[i].point,
              localPoint = point - hex.targetHex.position;

          var spark = new Line(trail.end, localPoint.angle, size * 2, color);

          tl.add(spark.animate(), 'trailDone');
      }

      return tl;
  }

  ////////////
  // UPDATE
  ////////////

  function onFrame(e) {
      if (e.count % 60 === 0) {
          createFirework();
      }
  }

  ////////////
  // utils
  ////////////

  function getRandomColor() {
      return new Color({
          hue:randomRange(0, 100),
          saturation:0.75,
          lightness:0.5
      })
  }

  function randomIndex(arr) {
      return arr[randomRange(0, arr.length, true)];
  }

  function randomRange(min, max, floor) {
      var v = min + Math.random() * (max - min);
      floor = floor || false;
      return floor ? (v | 0) : v;
  }
</script>