D3 Examples - D3-course-oct-2015 Renewable Energy

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Bar Chart, Framed</title>
        <script type="text/javascript" src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
        <link href="style.css" rel="stylesheet" type="text/css" />
        
    </head>
    <body>
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        <div id="container">
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            <h1>Use of renewable energy</h1>
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            <p>Use of renewable energy in % of total energy generation. <strong>Source:</strong> <a href="https://data.oecd.org/energy/renewable-energy.htm#indicator-chart" target="_blank">OECD</a>, 2015</h3></a></p>
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        </div>
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        <script type="text/javascript">     
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            var w = 700;
            var h = 900;
            var padding = [ 20, 10, 30, 100 ];  //Top, right, bottom, left
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            var widthScale = d3.scale.linear()
                                .range([ 0, w - padding[1] - padding[3] ]);
            
            var heightScale = d3.scale.ordinal()
                                .rangeRoundBands([ padding[0], h - padding[2] ], 0.1);
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            var xAxis = d3.svg.axis()
                            .scale(widthScale)
                            .orient("bottom");
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            var yAxis = d3.svg.axis()
                            .scale(heightScale)
                            .orient("left");
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            //Now SVG goes into #container instead of body
            var svg = d3.select("#container")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
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            d3.csv("renewable-energy.csv", function(data) {
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                data.sort(function(a, b) {
                    return d3.descending(+a.y2012, +b.y2012);
                });
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                widthScale.domain([ 0, d3.max(data, function(d) {
                    return +d.y2012;
                }) ]);
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                heightScale.domain(data.map(function(d) { return d.country; } ));
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                //Bind data to groups (not bars directly)
                var groups = svg.selectAll("g")
                                .data(data)
                                .enter()
                                .append("g")
                                .attr("class", "bar");
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                //Add a rect to each group
                var rects = groups.append("rect")
                    .attr("x", padding[3])
                    .attr("y", function(d) {
                        return heightScale(d.country);
                    })
                    .attr("width", 0)
                    .attr("height", heightScale.rangeBand())
                    .attr("fill", "#fff");
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                //Add a text element to each group
                groups.append("text")
                    .attr("x", function(d) {
                        return padding[3] + widthScale(d.y2012) - 3;
                    })
                    .attr("y", function(d) {
                        return heightScale(d.country) + 11;
                    })
                    .text(function(d) {
                        return d.y2012;
                    });
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                rects.transition()
                    .delay(function(d, i) {
                        return i * 50;
                    })
                    .duration(1000)
                    .attr("width", function(d) {
                        return widthScale(d.y2012);
                    });
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                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
                    .call(xAxis);
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                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
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            });
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        </script>
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    </body>
</html>
    