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',
      'C50,40 50,70 20,100',
      'L0,85',
      'L-20,100',
      'C-50,70 -50,40 0,0'
    ],
        // ADD 3 MORE PETAL PATHS                   
      [
        'M50,0',
        'C80,30 120,70 75,100',
        'C65,80 35,80 25,100',
        'C-20,70 20,30 50,00',
        'Z'
      ],
      [
        'M50,0',
        'C80,30 120,70 65,100',
        'C55,50 40,50 35,90',
        'C-20,70 20,30 50,00',
        'Z'
      ],
            ['M50,0',
        'C80,30 120,70 75,100',
        'L50,85',
        'L25,100',
        'C-20,70 20,30 50,00',
        'Z'
      ],
    ];
    
    // 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 numPetals = numPetalsScale(movies[0].votes);
      const petalsData = _.times(numPetals, (i) => {
        const rotate = (i / numPetals) * 360;
//         return {
//           numPetals,
//           size: sizeScale(movies[0].rating),
//           path: pathLookup[movies[0].pg]
//         };
        return {
          numPetals,
          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('.petal')
        .data(petalsData).enter().append('path')
        .classed('petal', true)
        .attr('transform', (d, i) => {
          const angle = i * (360 / d.numPetals);
          return `translate(100, 100)rotate(${d.rotate})scale(${d.size})`;
        })
        .attr('d', d => d.path)
        .attr('fill', 'none')
        .attr('stroke', '#444')
        .attr('stroke-width', 2)
      
      const flowers = svg.selectAll('g')
        .data(movies).enter().append('g')
        .attr('transform', (d, i) => {
        const x = (i % 3 + 0.5)  * 200;
        const y = (Math.floor(i/3) + 0.5) * 200;
        const scale = sizeScale(d.rating);
        return `translate(${x},${y})scale(${scale})`;
      });
    
    const petals = flowers.selectAll('path')
        .data(d => {
                const numPetals = numPetalsScale(d.votes);
        return _.times(numPetals, i => {
          return {
            rotate: (i / numPetals) * 360,
            path: pathLookup[d.pg],
          }
        })
      }).enter().append('path')
        .attr('transform', d=> `rotate(${d.rotate})`)
    });
    
    
    
  </script>
</body>
​
    