D3 Examples - Film Flowers, Single Starter

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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'
    ], 
    [
        'M0,100',
        'L100,100',
        'C150,50 100,50 50,0',
        'C0,50 -50,50, 0,100'
      ],
      [
        'M0,0',
        'C100,0 100,50 50,100',
        'C20,80 20,70 30,60',
        'C60,30 40,10 0,0'
      ],
      [
        'M0,0',
        'C50,25 50,25 100,0',
        'C50,50 50,50 50,100',
        'C50,50 50,50 0,0'
      ]
    ];
    
    // petal lookup for PG ratings
    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,
        }
      });
      
      // instantiate scales and petal path lookup
        const sizeScale = d3.scaleLinear()
        .domain([0, 10])
            .range([0.1, 1]);
        const numPetalsScale = d3.scaleQuantize()
            .domain(d3.extent(movies, d => d.votes))
            .range(_.range(5, 10));
      
      // 1. create petal data for just the first movie
      const pos = Math.floor(Math.random()*movies.length)
      const movie = movies[pos];
      console.log(movie)
      
      const numberPetals = numPetalsScale(movie.votes)
      
      const petalData = _.times(numberPetals, i => {
        return {
          rotate: 360 / numberPetals * i,
          path: pathLookup[movie.pg].join(' '),
          size: sizeScale(movie.rating)
        }
      })
      
      // 2. draw the petals using d3's data-binding and enter-append
      
      svg.selectAll()
            .data(petalData)
        .enter().append('path')
        .attr('stroke', '#000')
            .attr('stroke-width', 2)
            .attr('fill', (d, i) => d3.interpolateRainbow(i/numberPetals))
            .attr('d', d => d.path)
        .attr('transform', (d,i) => 
              `translate(200,200) rotate(${d.rotate}) scale(${d.size})`)
      
      svg.selectAll('text')
        .data([movie.title])
        .enter().append('text')
        .attr('x', 100)
        .attr('y', 350)
        .text(d => d)
    });
        
  </script>
</body>
​
    