D3 Examples - Rects with Image Pattern

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    .note {
      stroke: purple;
      stroke-width: 0.5px;
    }
    
    .note-percent {
      fill: purple;
      opacity: 0.5;
      stroke: purple;
    }
  </style>
</head>
​
<body>
  <script>
    var width = 960,
        height = 500;
    
    var imageURL = "https://i.imgur.com/2yueu7S.png";
    
    var initialPosition = { x: 50, y: 50 };
    
    var rectSize = { width: 100, height: 50 };
    
    var spacing = {
      h: 30,
      v: 30
    }
    
    var gridLength = 6;
    var dataLength = 28;
    var data = d3.range(0, dataLength, 1);
    
    var dataGrid = [];
    
    data.forEach(function(a, i) {
      var dataObj = {
        percent: Math.random(),
        x: i % gridLength,
        y: Math.floor(i / gridLength)
      };
      dataGrid.push(dataObj);
    });
    
    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", rectSize.width + spacing.h)
      .attr("height", rectSize.height + spacing.v)
        .attr("x", initialPosition.x + rectSize.width + spacing.h)
        .attr("y", initialPosition.y + rectSize.height + spacing.v)
      .append("image")
      .attr("xlink:href", imageURL)
      .attr("width", rectSize.width)
      .attr("height", rectSize.height);
    
    var rects = svg.append("g").selectAll("rect")
        .data(dataGrid)
    .enter().append("rect")
        .attr("class", "note")
        .attr("x", function(d) { 
        return initialPosition.x + (rectSize.width + spacing.h) * d.x; 
      })
        .attr("y", function(d) {
        return initialPosition.y + (rectSize.height + spacing.v) * d.y;
      })
        .attr("width", rectSize.width)
        .attr("height", rectSize.height)
        .attr("fill", "url(#money)");
    
    var percentRects = svg.append("g").selectAll("rect")
        .data(dataGrid)
    .enter().append("rect")
        .attr("class", "note-percent")
        .attr("x", function(d) { 
        return initialPosition.x + (rectSize.width + spacing.h) * d.x; 
      })
        .attr("y", function(d) {
        return initialPosition.y + (rectSize.height + spacing.v) * d.y;
      })
        .attr("width", 0)
        .attr("height", rectSize.height);
    
    percentRects
        .transition()
        .duration(500)
      .attr("width", function(d) {
                return rectSize.width * d.percent
      })
    
  </script>
</body>
​
    