D3 Examples - Film Flowers, Full 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',
      'C50,25 50,75 0,100',
      'C-50,75 -50,25 0,0'
    ],
    [
        'M0,0',
      'C50,40 50,70 20,100',
      'L0,85',
      'L-20,100',
      'C-50,70 -50,40 0,0'
    ],
    [
            'M-35,0',
      'C-25,25 25,25 35,0',
      'C50,25 25,75 0,100',
      'C-25,75 -50,25 -35,0'
    ],
    [
      'M0,0',
      'C50,40 50,70 20,100',
      'L0,85',
      'L-20,100',
      'C-50,70 -50,40 0,0'
    ]                   
    ];
    
    var color = d3.scaleLinear()
    .domain([0, 360])
    .range(["pink", "lightblue"]);
    
    // instantiate scales and petal path lookup
    const sizeScale = d3.scaleLinear()
        .range([0.5, 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
​
      // 2. create a <g> for each flower
      // and translate+scale the whole flower
      // instead of individual petals
      
      // 2. for each flower calculate
      // number of petals and their angle of rotation
      // and draw them like before
      
      // 1. set domain for scales
      var ratingExtent = d3.extent(movies, d => d.rating);
      sizeScale.domain(ratingExtent);
      
      var numberRatingsExtent = d3.extent(movies, d => d.votes);
      numPetalsScale.domain(numberRatingsExtent);
      
      var firstMovie = movies[0];
      var data = movies.map(movie => {
          var numPetals = numPetalsScale(firstMovie);
        var data = _.times(numPetals, (i) => {
          var degrees = i/numPetals * 360;
          return {
            degrees,
            scale: sizeScale(movie.rating),
            path: pathLookup[movie.pg],
            color: d3.interpolateRainbow(i/ numPetals),
          }
        });
        return data;
      })
      console.log('data', data)
      
      // 3. draw the petals using d3's data-binding and enter-append
      // (hint: use SVG transform for translation, rotation, and scale)
            var groups = svg.selectAll('g')
        .data(data).enter().append('g')
        .attr('transform', (d, i) => {
          var x = (i%3) * 200;
          var y = Math.floor(i/3) * 200;
          return `translate(${x}, ${y})`;
        });
      
      groups.selectAll('path')
        .data(d => d).enter().append('path')
        .attr('stroke', '#000')
        .attr('stroke-width', 2)
        .attr('fill', d => d.color)
        .attr('fill-opacity', .5)
        .attr('d', function(d) {return d.path})
        .attr('transform', function(d, i) {
          var x = 150;
          var y = 150;
          return `translate(${x}, ${y}) rotate(${d.degrees}) scale(${d.scale})`;
        })
    });
    
  </script>
</body>
​
    