Pie Chart with Image Pattern

Using SVG patterns to create pie charts with image fills. It dynamically calculates the spacing for the pattern to allow for space between each pie chart (some work still needs to be done to perfect these calculations). Ideally we want to be able to give it the width/height of each, the initial x/y and the vertical/horizontal padding between each.

forked from tlfrd's block: Pie Chart with Image Pattern

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    .coin {
      stroke: black;
    }
    
    .pie-segment {
      stroke: black;
      fill: white;
    }
  </style>
</head>

<body>
  <script>
    var width = 960,
        height = 500;
    
    var imageURL = "https://www.thenewpoundcoin.com/images/layout/pound-coin.png";
    
    var circleSize = { width: 75, height: 75 },
        circlePos = { 
          x: circleSize.width * 1, 
          y: circleSize.height * 3 
        };
    
    var spacing = 30;
    
    var angles = [0.1, 0.37, 0.2, 0.25, 0.1, 0.05, ];
    
    var path = d3.arc()
    	.outerRadius(circleSize.width / 2)
    	.innerRadius(0)
    	.startAngle(0);
    
    var generateArc = function(fraction) {
      return path({endAngle: Math.PI * 2 * fraction})
    }
    
    var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)
    
    svg.append("defs")
    	.append("pattern")
    	.attr("id", "money")
    	.attr('patternUnits', 'userSpaceOnUse')
      .attr("width", circleSize.width + spacing)
      .attr("height", circleSize.height)
    	.attr("x", circlePos.x - (circleSize.width / 2) + (spacing / 2))
    	.attr("y", circleSize.height / 2)
      .append("image")
      .attr("xlink:href", imageURL)
      .attr("width", circleSize.width + spacing)
      .attr("height", circleSize.height);
    
    var cirlces = svg.selectAll("circle")
    	.data(angles)
    .enter().append("circle")
    	.attr("class", "coin")
    	.attr("cx", function(d, i) { return (circlePos.x + spacing) * (i + 1) })
    	.attr("cy", circlePos.y)
    	.attr("r", circleSize.width / 2)
    	.attr("fill", "url(#money)");
    
    var arcs = svg.selectAll("g")
      .data(angles)                      
     .enter().append("g")
    	.attr("transform", function(d, i) {
        return "translate(" + (circlePos.x + spacing) * (i + 1) + ", " + circlePos.y + ")";
      })
    	.append("path")
    	.attr("class", "pie-segment")
    	.attr("d", function(d) {
        this._current = 0.0001;
        return generateArc(this._current);
      });
    
    arcs
    .data(angles)
    .transition()
    .duration(1000)
    .attrTween("d", arcTween);
    
    function arcTween(a) {
      var i = d3.interpolate(this._current, a);
      this._current = i(0);
      return function(t) {
        return generateArc(i(t));
      };
    }
    
  </script>
</body>

https://d3js.org/d3.v4.min.js