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: 600px;
      height: 20000px;
    }
  </style>
</head>
​
<body>
  <svg></svg>
  
  <script>
    const width = 600;
    const height = 600;
    
    const petalPaths = [
        [
        'M0,0',
      "C50,50 50,100 0,100",
      "C-50,100 -50,50 0,0"
    ],
      
      [
        'M-5,0',
        'C-5,50 -5,50 -25,50',
        'C0,100 0,100 25,50',
        'C5,50 5,50 5,0',
        'L-5,0',
        'C-5,30 -5,30 -25,30',
        'C0,100 0,100 25,30',
        'C5,30 5,30 5,0',
        'L-5,0',
        'C-5,10 -5,10 -25,10',
        'C0,100 0,100 25,10',
        'C5,10 5,10 5,0',
        'M0,0',
        'L0,87'
      ],
      [
        'M0,0',
        'C50,40 50,70 20,100',
        'L0,0',
        'L-20,100',
        'C-50,70 -50,40 0,0',
        'M25,25',
        'L30,90',
        'M-25,25',
        'L-30,90',
        'M0,0',
        'L-22,100',
        'M0,0',
        'L18,100',
      ],
      [
        'M-5,0',
        'L-5,50',
        'L-25,20',
        'L-25,100',
        'C-5,50 5,50 25,100',
        'M-25,100',
        'C-10,50 10,50 25,100',
        'M-25,100',
        'C-20,40 20,40 25,100',
        'M-25,100',
        'C-30,30 30,30 25,100',
        'M-25,100',
        'C-40,20 40,20 25,100',
        'M-25,100',
        'C-50,10 50,10 25,100',
        'L25,20',
        'L5,50',
        'L5,0',
                'L-5,0'
      ]
    ];
    
    // 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
      const ratingExtent = d3.extent(movies, d => d.rating);
      const votesExtent = d3.extent(movies, d => d.votes);
      sizeScale.domain(ratingExtent);
      numPetalsScale.domain(votesExtent);
      // 2. create petal data for just the first movie
      const groups = svg.selectAll('g')
        .data(movies).enter().append('g')
        .attr('transform', (d, i) => `translate(${i % 3 * 200},${Math.floor(i/3) * 200})`);
      const circles = groups.selectAll('.petal')
        .data(d => {
          const numPetals = numPetalsScale(d);
          const petalsData = _.times(numPetals, (i) => {
            return {
              numPetals,
              size: sizeScale(d.rating),
              path: pathLookup[d.pg],
              color: d3.interpolateRainbow(i/numPetals)
            };
          });
          return petalsData;
        }).enter().append('path')
      
        .classed('petal', true)
        .attr('transform', (d, i) => {
          const angle = i * (360 / d.numPetals);
          return `translate(100, 100)rotate(${angle})scale(${d.size})`;
        })
        .attr('d', d => d.path)
        .attr('fill', 'none')
        .attr('stroke', d => d.color)
        .attr('stroke-width', 2)
​
//       // 3. draw the petals using d3's data-binding and enter-append
//       // (hint: use SVG transform for translation, rotation, and scale)
        
//       svg.selectAll('.petal')
//          .data(petalsData).enter().append('path')
//          .classed('petal', true)
//          .attr('transform', (d, i) => {
//           const angle = i * (360 / d.numPetals);
//           return `translate(100, 100)rotate(${angle})scale(${d.size})`;
//         })
//          .attr('d', d => d.path)
//          .attr('fill', 'none')
//          .attr('stroke', '#444')
//          .attr('stroke-width', 2)
    });
    
    
  </script>
</body>
​
    