gini curves

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<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 14px sans-serif;
}

.axis path,
  
.axis line {
  fill: none;
  stroke: #e5e5e5;
  shape-rendering: crispEdges;
}

.axis path {
  display: none;
}

.line {
  fill: none;
  stroke-width: 1px;
  opacity: 1;
}

.androgs {
  fill: none;
  stroke: #aaa;
  stroke-linejoin: round;
  stroke-linecap: round;
  stroke-width: 1.5px;
}
  
.androg--hover {
  stroke: #000;
  stroke-width: 20px
}
  
  
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 60, right: 80, bottom: 60, left: 80},
    width = 700 - margin.left - margin.right,
    height = 460 - margin.top - margin.bottom;

var x = d3.scale.linear()
    .range([0, width])
	  .domain([12,1]);

var y = d3.scale.linear()
    .range([height, 0])
	.domain([0,1]);

var color = d3.scale.ordinal()
	.range(["#e4b31f", "#9d1422", "#f9db9e", "#f4a3a5", "#f1624f"])
	.domain(["A","B","C","D","E"]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
	.tickFormat(d3.format("d"));

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
	.ticks(5)
	.tickSize(-width, 0, 0);

var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.rank); })
    .y(function(d) { return y(d.cohort); });

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 + ")");

d3.csv("wins.txt", function(error, data) {
  if (error) throw error;
  
  data.forEach(function (d,i) {
	  d.rank = +d.rank;
	  d.A = +d.A;
	  d.B = +d.B;
	  d.C = +d.C;
    d.D = +d.D;
    d.E = +d.E;
  })

//Append axes
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis);

//Append the lines
  	var lines = svg.selectAll(".lines")
      	.data(cohortLines)
    	.enter().append("g")
      	.attr("class", "lines");

//Very thick barely visible line
	lines.append("path")
		.attr("class", "line")
		.attr("d", function(d) { return line(d.values); })
		.style("stroke", function(d) { return color(d.name); })
		.style("stroke-width", 10)
		.style("opacity", 0.05)
       .on("mouseover", function() {
  d3.select(this)
      .style("stroke-width", 20)
		  .classed("androg--hover", true ) 
})
  .on("mouseout",  function() {
  d3.select(this)
     .style("stroke-width", 10)
		 .classed("androg--hover", true)
  })
  ;
		
	//Thick rather difficult to see line
	lines.append("path")
      	.attr("class", "line")
      	.attr("d", function(d) { return line(d.values); })
      	.style("stroke", function(d) { return color(d.name); })
		.style("stroke-width", 6)
		.style("opacity", 0.1)
  ;
			
	//Actual full opacity thin line		
	lines.append("path")
	      	.attr("class", "line")
	      	.attr("d", function(d) { return line(d.values); })
	      	.style("stroke", function(d) { return color(d.name); })
			.style("stroke-width", 1.5)
 ;

});

</script>

https://d3js.org/d3.v3.min.js