D3 Examples - Film Flowers, Single Starter Code

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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: 800px;
      height: 1600px;
    }
  </style>
</head>
​
<body>
  <svg></svg>
  
  <script>
    const width = 800;
    const height = 800;
    
    const petalPaths = [[
        'M0,0',
      'C50,40 50,70 20,100',
      'L0,85',
      'L-20,100',
      'C-50,70 -50,40 0,0'
    ],
        [
        'M0,0',
        'C25,10 70,150 0,90',
        'C-70,150 -25,10 0,0'
      ],
      [
        'M0,0',
        'C-15,50 50,50 10,100',
        'C5,95 -5,95 -10,100',
        'C-60,65 -15,10 0,0'
      ],
      [
        'M-5,0',
        'L5,0',
        'C70,80 5,95 0,120',
        'C-5,95 -70,80 -5,0',
      ]                 
    ];
    
    // instantiate scales and petal path lookup
    const sizeScale = d3.scaleLinear()
        .range([0.1, 1]);
    const numPetalsScale = d3.scaleQuantize()
        .range(_.range(5, 13));
​
    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,
          genre: movie.Genre
        }
      });
    
    console.log(movies)
    // map rating -> sizeScale
    var ratingExtent = d3.extent(movies, m => m.rating)
    sizeScale.domain(ratingExtent)
    // map votes -> numPetalsScale
    var votesExtent = d3.extent(movies, m => m.votes)
    numPetalsScale.domain(votesExtent)
    
    var flowers = svg.selectAll('.flower')
        .data(movies)
        .enter().append('g')
        .classed('flower', true)
        .attr('transform', function(d, i) {
        var x = (i % 4 + 0.5) * 200;
        var y = (Math.floor(i / 4) + 0.5) * 200;
        var size = sizeScale(d.rating)
        return `translate(${x}, ${y}) scale(${size})`;
      })
    
    
    flowers.selectAll('.petal')
      .data(d => {
          var numPetals = numPetalsScale(d.votes);
          return _.times(numPetals, i => {
            return {
              angle: 360 / numPetals * i,
              path: pathLookup[d.pg]
            }
          });
        })
      .enter().append('path')
      .classed('petal', true)
        .attr('stroke', '#000')
        .attr('stroke-width', 2)
        .attr('fill', 'rgba(222,206,120, 0.8)')
        .attr('d', (d) => d.path)
        .attr('transform', (d) => `rotate(${d.angle})`)
    });
    
  </script>
</body>
​
    