D3 Examples - How much is thirteen to twenty-seven?

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>How much is thirteen to twenty-seven?</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.min.js"></script>
        <style type="text/css">
            
            body {
                background-color: white;
                font-family: Verdana;
            }
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            svg {
                background-color: white;
            }
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            circle {
                fill: rgb(60, 161, 189);
            }
​
            circle:hover { 
                fill: rgb(33, 93, 109);
            }
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            text {
                fill: black;
            }
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            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
​
        </style>
    </head>
    <body>
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        <h2>How much is thirteen to twenty-seven?</h2>
        <p>This dataset gives an insight about the mathematics skills of boys and girls across 37 OECD countries. Each circle represent a country, placed according to boys' score on y axis and girls' score on x axis. </p>
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        <script type="text/javascript"> 
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            var w = 500
            var h = 500
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            var padding = [ 50, 50, 50, 50 ];  //Top, right, bottom, left
​
​
            var xScale = d3.scale.linear()
                            .range ([ 0, w - padding[1] - padding[3] ]);
​
            var yScale = d3.scale.linear()
                            .range ([ 0, h - padding[0] - padding[2] ]);
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            var xAxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom")
                            .ticks(15);
​
            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .orient("left")
                            .ticks(15);
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
​
​
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            d3.csv("OECD_ISA_2012.csv", function(data) {
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                data.sort(function(a,b){
                    return d3.ascending (a.mathGirls, b.mathGirls);
                })
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                xScale.domain([ 
                    d3.min(data, function(d) {
                        return +d.mathGirls;
                    }), 
                    d3.max(data, function(d) {
                        return +d.mathBoys;
                    })
                ]);
​
                yScale.domain([
                    d3.max(data, function(d) {
                        return +d.mathBoys;
                    }),
                    d3.min(data, function(d) {
                        return +d.mathGirls;
                    })
                ]);
​
            svg.append("line")
                .attr("x1", padding[3])
                .attr("y1", (h - padding[2]))
                .attr("x2", (w - padding[1])) 
                .attr("y2", padding[0])
                .attr("stroke", "black")
                .attr("stroke-width","1");
​
            svg.append("text")
                .attr("x", (padding[3] + 20))
                .attr("y", (padding[0] + 12))
                .attr("text-anchor", "start")
                .attr("font-size", 12)
                .text("Boys performed better")
​
​
            svg.append("text")
                .attr("x", (w - padding[1]))
                .attr("y", (h - padding[2] - 20))
                .attr("text-anchor", "end")
                .attr("font-size", 12)
                .text("Girls performed better")
​
            svg.append("g")
                .attr("class", "x axis")
                .attr("transform", "translate(" + (padding[3]) + "," + (h - padding[0]) + ")")
                .call(xAxis);
​
            svg.append("g")
                .attr("class", "y axis")
                .attr("transform", "translate(" + (padding[3]) + ", " + (padding[0]) + ")")
                .call(yAxis);
​
            var circles = svg.selectAll("circle")
                    .data(data)
                    .enter()
                    .append("circle")
​
​
                circles.attr("cx", function(d){
                        return xScale(d.mathGirls)+padding[3];
                    })
                    .attr("cy", function(d, i){
                        return yScale(d.mathBoys)+padding[2];
                    })
                    .attr("r", 4)
                    .append("title")
                    .text(function(d){
                        return d.country+": girls scored "+d.mathGirls+" points ; boys scored "+d.mathBoys+" points"
                    });
​
            // var labels = svg.selectAll("text")
            //      .data(data)
            //      .enter()
            //      .append("text")
​
            //  labels.attr("x", 10)
            //      .attr("y", function(d, i){
            //          return i * heightScale.rangeBand()+heightScale.rangeBand()*0.7;
            //      })
            //      .attr("font-size", function(d){
            //          return heightScale.rangeBand()*0.7;
            //      })
            //      .text(function(d){
            //          return d.country;
            //      })
​
            });
​
        </script>
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    </body>
</html>
    