DS July: Code 3 by sxywu

index.html

<!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>
  
  <style>
    svg {
      width: 1200px;
      height: 10000px;
    }
  </style>
</head>

<body>
  <svg>
  </svg>
  <script>
    var padding = 20;
    var svg = d3.select('svg')
    	.append('g')
    	.attr('transform', 'translate(' + [padding, padding] + ')');
    
    var flowerSize = 300;
		var petalPaths = [[
    	'M0,0',
      "C50,50 50,100 0,100",
      "C-50,100 -50,50 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'
    ],
    [
      'M0,0',
      'C50,25 50,75 0,100',
      'C-50,75 -50,25 0,0'
    ]];
    var numPetals = _.range(1, 11);
    
    var sections = svg.selectAll('g.section')
    	.data(numPetals).enter().append('g')
    	.classed('section', true)
    	.attr('transform', function(d, i) {
        return 'translate(0,' + (i * flowerSize) + ')';
      });
    
    var flowers = sections.selectAll('g.flower')
    	.data(function(d) {
        return _.map(petalPaths, function(path) {
          return {
            numPetals: d,
            path: path
          }
        });
      }).enter().append('g')
    	.classed('flower', true)
    	.attr('transform', function(d, i) {
      	var x = (i % 4) * flowerSize;
      	var y = Math.floor(i / 4) * flowerSize;
      	return 'translate(' + x + ',' + y + ')';
      });
    
    flowers.selectAll('path')
    	.data(function(d) {
      	// for each flower, draw the petal 6 times
      	return _.times(d.numPetals, function(i) {
          return {
            angle: (360/d.numPetals) * i,
            path: d.path
          }
        });
      }).enter().append('path')
    	.attr('stroke', '#000')
    	.attr('stroke-width', 2)
    	.attr('fill', 'none')
    	.attr('d', function(d) {return d.path})
    	.attr('transform', function(d) {
      	var cx = flowerSize / 2;
      	var cy = flowerSize / 2;
      	return 'translate(' + [cx, cy] +
          ')rotate(' + [d.angle] + ')';
      });
  </script>
</body>