D3 Examples - Film Flowers, Single Scaled 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 50,70 20,100',
        'L0,85',
        'L-20,100',
        'C-50,70 -50,40 0,0'
      ],
       [
        'M0,0',
        'C0,50 -50,50 -50,100',
        'C-50,120 -35,120 -20,110',
        'C-10,100 10,100 20,110',
        'C 35,120 50,120 50,100',
        'C 50,50 0,50 0,0'
      ],
      [
        'M0,0',
        'C0,0 0,70 60,100',
        'L20,100',
        'C10,120 -10,120 -20,100',
        'L-60,100',
        'C0,70 0,0 0,0'
      ],
      [
        'M0, 0',
        'C0,-70 90,-10 100,0',
        'C90,10 0,70 0,0',
        'C-5,0 -10,-10 100,-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 petal data for just the first movie
      function drawFlowers(index){};
      const numPetals = numPetalsScale(movies[0].votes)
      const petalData = _.times(numPetals, (i) => {
        // 1. rotation of the petal
        const rotate = (i / numPetals) * 360;
        // 2. path of petal (pg)
        // 3. size of petals (IMDB ratings)
        return {
          rotate,
          path: pathLookup[movies[0].pg],
          size: sizeScale(movies[0].rating),
        }
      });
      
      // 3. draw the petals using d3's data-binding and enter-append
      // (hint: use SVG transform for translation, rotation, and scale)
      svg.selectAll('path')
        .data(petalData).enter().append('path')
        .attr('transform', d => {
            return `translate(100,100)rotate(${d.rotate})scale(${d.size})`
        })
        .attr('d', d => d.path)
        .attr('fill', 'none')
        .attr('stroke', '#000');
    });
   
    var index = 0;
    setInterval(() => {
    //petalData(data[index % 3]);
      index += 1;
      //console.log(index);
    }, 500);
    
  </script>
</body>
​
    