code: function _drawParticles() {
              // Previous paths...
              let prev = ctx.globalCompositeOperation;
              ctx.globalCompositeOperation = 'destination-in';
              ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
              //ctx.globalCompositeOperation = 'source-over';
              ctx.globalCompositeOperation = prev;
  
              // fading paths...
              ctx.fillStyle = `rgba(0, 0, 0, ${self.options.fade})`;
              ctx.lineWidth = self.options.width;
              ctx.strokeStyle = self.options.color;
  
              // New paths
              paths.forEach(function(par) {
                  self._drawParticle(viewInfo, ctx, par);
              });
          }
docs: Draws the paths on each step