D3 Examples - Film Flowers, Full Complete

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.13.1/lodash.js'></script>
  <link href='https://fonts.googleapis.com/css?family=Libre+Baskerville:400,700' rel='stylesheet' type='text/css'>
  
  <style>
    svg {
      width: 600px;
      height: 20000px;
    }
  </style>
</head>
​
<body>
  <svg></svg>
  
  <script>
    const width = 600;
    const height = 600;
    
    const petalPaths = [
      [
            'M0,0',
        'C50,40 50,62 20,117',
        'C-50,66 -106,40 0,0'
        ],
      [
            'M0,0',
        'C-40,-25 -60,-50 0,-75',
        'C70,-60 5,-25 0,0'
        ],
      [
       'M0,0',
        'C50,40 50,100 20,154',
        'C-50,66 -48,40 0,0'
      ],
      [
            'M0, 0',
        'C0,-70 90,-10 100,0',
        'C90,10 0,70 0,0',
        'C-5,0 -10,-10 79,-20',
        'C-10,-10 0,-5 0,0',
        'C-5,0 -10,10 100,20',
        'C-10,10 0,5 0,0'
        ]
    ];
    
    // instantiate scales and petal path lookup
    const sizeScale = d3.scaleLinear()
        .range([0.1, 1]);
    const numPetalsScale = d3.scaleQuantize()
        .range(_.range(5, 10));
    const pathLookup = {
      G: petalPaths[0],
      PG: petalPaths[1],
      'PG-13': petalPaths[2],
      R: petalPaths[3],
    };
    
    // grab svg
    const svg = d3.select(' svg');
    
    /*****************************************************
    ** get movie data
    ******************************************************/
    
    d3.json('movies.json', function(movies) {
      movies = _.map(movies, movie => {
        return {
          rating: ++movie.imdbRating,
          votes: parseInt(movie.imdbVotes.replace(/\,/g, '')),
          year: ++movie.Year,
          title: movie.Title,
          pg: movie.Rated,
        }
      });
      
      // 1. set domain for scales
      // size scale = rating
      // number of petals scale = number of votes
      const sizeExtent = d3.extent(movies, d => d.rating);
      const numPetalsExtent = d3.extent(movies, d => d.votes);
      // set domain on scales
      sizeScale.domain(sizeExtent);
      numPetalsScale.domain(numPetalsExtent);
​
      // 2. create a <g> for each flower
      // and translate+scale the whole flower
      // instead of individual petals
      const flowers = svg.selectAll('g')
        .data(movies).enter().append('g')
        .attr('transform', (d, i) => {
          const x = (i % 3 + 0.5) * 200;
          const y = (Math.floor(i / 3) + 0.5) * 200;
          const scale = sizeScale(d.rating);
          return `translate(${x},${y})scale(${scale})`;
        });
      
      // 2. for each flower calculate
      // number of petals and their angle of rotation
      // and draw them like before
      const petals = flowers.selectAll('path')
        .data(d => {
          const numPetals = numPetalsScale(d.votes);
          return _.times(numPetals, i => {
            return {
              rotate: (i / numPetals) * 360,
              path: pathLookup[d.pg],
              color: d3.interpolateRainbow(i / numPetals),
            }
          })
        }).enter().append('path')
        .attr('transform', d => `rotate(${d.rotate})`)
        .attr('d', d => d.path)
        .attr('fill', d => d.color)
        .attr('stroke-width', 12)
        .style('mix-blend-mode', 'multiply')
    });
    
  </script>
</body>
​
    