requirebin sketch

index.js

var hypotrochoid = require('hypotrochoid')
  , d3 = require('d3')

var ranged = range(0, 500, 1)
var points = ranged.map(function(t) {
  return hypotrochoid(70, [50, 70, 82.5], t)
})

function range(start, end, inc) {
  var a = []
  for (var i = start; i < end; i += inc) a[a.length] = i
  return a
}

var line = d3.svg.line()
  .interpolate('basis')
  .x(function(d) { return d[0] })
  .y(function(d) { return d[1] })

var svg = d3.select('body').append('svg')
  .attr('width', 512)
  .attr('height', 512)

var stamp = svg.append('g')
  .attr('transform', 'translate(256,256)')

var path = stamp.append('path')
    .attr('d', line(points))
    .attr('stroke', '#000')
    .attr('fill', 'none')

setInterval(function() {
  var a = Math.random() * 190 + 10
  var b = Math.random() * 190 + 10
  var c = Math.random() * 190 + 10
  var h = 30 + Math.random() * 60
  ranged.forEach(function(t, i) {
    points[i] = hypotrochoid(h, [a, b, c], t)
  })

  path.transition()
    .duration(2500)
    .attr('d', line(points))
}, 2500)

minified.js

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package.json

{
  "name": "requirebin-sketch",
  "version": "1.0.0",
  "dependencies": {
    "hypotrochoid": "0.0.1",
    "d3": "3.4.4"
  }
}

page-head.html

<style type='text/css'>html, body { margin: 0; padding: 0; border: 0; }
body, html { height: 100%; width: 100%; }</style>

requirebin.md

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