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',
        'C40,30 40,70 25,100',
        'C20, 70, -20, 70, -25, 100',
        'C-40,70, -50,30,0, 0' 
      ],
      [
        'M0,0',
        'C0,10 0,30 20,40',
        'C20, 70, -20, 70, -25, 100',
        'C-40,70, -50,30,0, 0' 
      ],
      [
        'M0,0',
        'C50,30 50,70 0,100',
        'C-50,70, -50,30,0, 0' 
      ], 
                        [
        'M0,0',
        'C30,30 40,70 25,100',
        'L10,80',
        'L-5,100',
        'L-20,80',
        'L-35,100',
        'C-40,70, -40,30,0, 0'
      ],
                        [
        'M0,0',
        'C-20,10 -20,30 0,40',
        'C-20,60 -20,70 20,100',
        'C40,70 40,40 20,40',
        'C40,30 40,10 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,
        }
      });
      
      // set domain for scales
      const ratingExtent = d3.extent(movies, d => d.rating);
      const votesExtent = d3.extent(movies, d => d.votes);
      sizeScale.domain(ratingExtent);
      numPetalsScale.domain(votesExtent);
      
      // create a <g> for each flower
      // and translate+scale the whole flower
      // instead of individual petals
      let flowers = svg.selectAll('.flower')
        .data(movies).enter().append('g')
        .attr('transform', (d, i) => {
          const x = (Math.floor(i % 3) + 0.5) * 200;
          const y = (Math.floor(i / 3) + 0.5) * 200;
          const size = sizeScale(d.rating);
          return `translate(${x}, ${y})scale(${size})`;
        });
      
      // for each flower, calculate number of petals
      // and angle for each petal, and draw them
      let petals = flowers.selectAll('.petal')
        .data(d => {
          const numPetals = numPetalsScale(d.votes);
          return _.times(numPetals, i => {
            return {
              angle: i * (360 / numPetals),
              path: pathLookup[d.pg]
            };
          });
        }).enter().append('path')
        .attr('transform', (d) => `rotate(${d.angle})`)
        .attr('d', d => d.path)
        .attr('fill', '#e3c468')
        .attr('stroke', '#f1f1f1')
        .attr('stroke-width', 3)
    });
    
  </script>
</body>
​
    