Visualising Ratios

Experimenting with ways to visualise ratios for a story exploring the pay ratios between the lowest and highest paid at a company.

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    text {
      font-family: monospace;
    }
    
    rect {
      stroke: #a5b98c;
    }
  </style>
</head>

<body>
  <script>
		var margin = {top: 70, right: 20, bottom: 20, left: 20};
    
    var width = 960 - margin.left - margin.right,
    		height = 500 - margin.top - margin.bottom;
    
    var svg = d3.select("body").append("svg")
          .attr("width", width + margin.left + margin.right)
          .attr("height", height + margin.top + margin.bottom)
        .append("g")
          .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
    
    var ratios = [
      {min: 34, median: 8},
      {min: 14.1, median: 7.6},
      {min: 15, median: 9},
      {min: 12.9, median: 5.8},
      {min: 10.6, median: 4.2},
      {min: 40, median: 5.9},
      {min: 14.3, median: 5.58}
    ];

// might use this at some point
		// ratios.sort(function(a, b) {
		// 	return b.min - a.min;
		// })
    
    var xSpacing = 20,
        ySpacing = 30;
    
    var legend = svg.append("g").attr("class", "legend");
    legend.append("text")
    	.attr("x", margin.left)
    	.attr("y", 0)
    	.text("For every -- the lowest paid employee earns the highest earns");
    
    legend.append("rect")
    	.attr("x", margin.left + 81)
    	.attr("y", -10.5)
      .attr("width", 15)
    	.attr("height", 12)
    	.attr("fill", "#6c7c59")
    
    legend.append("text")
      .attr("x", margin.left + 84.5)
    	.attr("y", -0.5)
    	.text("£")
    	.style("font-size", 10)
    
    legend.append("g").selectAll("rect")
    	.data([0, 1, 2])
    .enter().append("rect")
    	.attr("x", function(d) { return margin.left + 500 + (d * xSpacing)})
    	.attr("y", -10.5)
      .attr("width", 15)
    	.attr("height", 12)
    	.attr("fill", "#e1e7d8")
    
    legend.append("g").selectAll("text")
    	.data([0, 1, 2])
    .enter().append("text")
    	.attr("x", function(d) { return margin.left + 503.5 + (d * xSpacing)})
    	.attr("y", -0.5)
    	.text("£")
    	.style("font-size", 10);
    
    var ratioGroups = svg.append("g")
    	.attr("class", "ratio-groups")
    	.selectAll("g")
    	.data(ratios)
    .enter().append("g")
    	.attr("class", "ratio");
   	
    var counter = 0;
    
    // add rectangles and fade in
    ratioGroups.selectAll("rect")
    	.data(function(d, i) { 
      	var range = d3.range(0, Math.round(d.min) + 1, 1);
      	return range.map(function(x) {
          return {x: x, i: i};
        })
    	})
    .enter().append("rect")
      .attr("x", function(d) { 
      	if (d.x == 0) {
          return margin.left;
        } else {
      		return margin.left + 10 + d.x * xSpacing;
        }
    	})
    	.attr("y", function(d) { return margin.top + d.i * ySpacing })
    	.attr("width", 15)
    	.attr("height", 12)
    	.attr("fill", function(d) {
      	if (d.x == 0) {
          return "#6c7c59";
        } else {
          return "#e1e7d8";
        }
    	})
    	.attr("opacity", function(d) {
      	if (d.x == 0) {
          return 1;
        } else {
          return 0;
        }
    	})
    	.transition()
    	.delay(function(d) {
				return (d.x * 25) + (d.i * 100);
    	})
      .attr("opacity", 1);
    
    // add text and fade in
    ratioGroups.selectAll("text")
    	.data(function(d, i) { 
      	var range = d3.range(0, Math.round(d.min) + 1, 1);
      	return range.map(function(x) {
          return {x: x, i: i};
        })
    	})
    	.enter().append("text")
      .attr("x", function(d) { 
      	if (d.x == 0) {
          return margin.left;
        } else {
      		return margin.left + 10 + d.x * xSpacing;
        }
    	})
    	.attr("y", function(d) { return margin.top + d.i * ySpacing })
    	.attr("dx", xSpacing / 5)
    	.attr("dy", ySpacing / 3)
    	.style("font-size", 10)
    	.attr("opacity", function(d) {
      	if (d.x == 0) {
          return 1;
        } else {
          return 0;
        }
    	})
    	.text("£")
      .transition()
    	.delay(function(d) {
				return (d.x * 25) + (d.i * 100);
    	})
      .attr("opacity", 1)
    
    // delay by the amount of time each ratio takes to animate
    ratioGroups
    	.append("text")
    	.attr("x", function(d) { return margin.left + 10 + (Math.round(d.min) + 1) * xSpacing})
    	.attr("y", function(d, i) { return margin.top + i * ySpacing })
    	.attr("dx", "0.7em")
    	.attr("dy", "0.8em")
    	.text(function(d) { return d.min + ":1"; })
     	.attr("opacity", 0)
     	.transition()
     	.delay(function(d, i) { return (Math.round(d.min) * 25) + (i * 100) })
     	.attr("opacity", 1);
    
    ratioGroups
    	.append("text")
    	.attr("x", margin.left + 10)
    	.attr("y", function(d, i) { return margin.top + i * ySpacing })
      .attr("dx", "0.6em")
    	.attr("dy", "0.7em")
    	.text(":")
    	
    
  </script>
</body>

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