D3 Examples - CO2 emissions data (visualization with scales and axes)

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Visualization using D3</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            body {
                background-color: white;
                font-family: Helvetica, Arial, sans-serif;
            }
​
            h1 {
                font-size: 22px;
                font-weight: bold;
                font-family: Helvetica;
                margin: 0;
                color: rgb(0, 0, 0);
            }
​
            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
​
            svg {
                background-color: white;
            }
​
            rect:hover {
                fill: red;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: gray;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
​
            .y.axis path,
            .y.axis line {
                opacity: 0;
            }
​
        </style>
    </head>
    <body>
​
        <h1>CO2 gas emissions by various countries for the year 1999</h1>
​
        <p>Source: Air and Green House Gas emissions, <a href="https://data.oecd.org/air/air-and-ghg-emissions.htm">OECD</a>, 2012</p>
​
        <script type="text/javascript">
​
            var strYear = '1999';
​
            var w = 1200;
            var h = 1000;
            var padding = [10, 60, 60, 140];  // top, right, bottom, left
​
            var widthScale = d3.scale.linear()
                                .range([0, w - padding[1] - padding[3]]);
            
            var heightScale = d3.scale.ordinal()
                                .rangeRoundBands([padding[0], h - padding[2]], 0.10); // separation of 10% between the bars
​
            var xAxis = d3.svg.axis()
                            .scale(widthScale)
                            .orient("bottom");
​
            var yAxis = d3.svg.axis()
                            .scale(heightScale)
                            .orient("left");
​
            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
​
            d3.csv("co2_emissions.csv", function(data) {
​
                data.sort(function(a, b) {
                    return d3.descending(+a[strYear], +b[strYear]);
                });
​
                widthScale.domain([0, d3.max(data, function(d) {
                    return +d[strYear];
                })]);
​
                heightScale.domain(data.map(function(d) { 
                    return d.Country;
                }));
​
                var rects = svg.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
​
                rects.attr("x", padding[3])
                    .attr("y", function(d) {
                        return heightScale(d.Country);
                    })
                    .attr("width", function(d) {
                        return widthScale(d[strYear]);
                    })
                    .attr("height", heightScale.rangeBand())
                    .attr("fill", "rgb(100, 100, 100)")
                    .append("title")
                    .text(function(d) {
                        return "CO2 emission by " + d.Country + " in the year " + strYear + " was " + d[strYear] + " million tonnes.";
                    });
​
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
                    .call(xAxis);
​
                svg.append("text")
                    .attr("class", "x label")
                    .attr("text-anchor", "middle")
                    .attr("x", w / 2)
                    .attr("y", h - padding[2] + 50)
                    .text("million tonnes")
​
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ", 0)")
                    .call(yAxis);
​
            });
​
        </script>
    </body>
</html>
    