D3 Examples - Comparison of two-wheeled traffic counts in the East Midlands from 2007 to 2011 with scaled colours

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Two-wheeled vehicle traffic counts in the East Midlands from 2007 - 2011</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;
            }
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            h1 {
                font-size: 24px;
                margin: 0;
            }
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            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
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            svg {
                background-color: white;
            }
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            rect:hover {
                fill: white;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
            
            .axis2 path,
            .axis2 line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis2 text {
                font-family: sans-serif;
                font-size: 11px;
            }
            
            .y.axis path,
            .y.axis line {
                opacity: 0;
            }
            .y.axis2 path,
            .y.axis2 line {
                opacity: 0;
            }
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        </style>
    </head>
    <body>
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        <h1>Two-wheeled vehicle traffic counts in the East Midlands from 2007 - 2011</h1>
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        <p>Comparison of bicycle and motorbike traffic counts in the East Midlands at different times of day in the period from 2007 - 2011. Source: <a href="https://data.gov.uk/dataset/gb-road-traffic-counts/resource/8d49272c-e525-495e-a60c-a93d62aedd6e">gov.uk</a></p>
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        <script type="text/javascript">     
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​
            var w = window.innerWidth;
            var h = window.innerHeight/1.25;
            var padding = [ 20, 10, 30, 120 ];  //Top, right, bottom, left
​
​
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            var widthScale = d3.scale.linear()
                                .range([ 0, w/4 - padding[1] - padding[3] ]);
            
            var heightScale = d3.scale.ordinal()
                                .rangeRoundBands([ padding[0], h - padding[2] ], 0.4);
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            var widthScale2 = d3.scale.linear()
                                .range([ w/4 - padding[1] - padding[3], 0 ]);
                                
            var widthScale3 = d3.scale.linear()
                                .range([ w/4 - padding[1] - padding[3], 0 ]);
            
            var heightScale2 = d3.scale.ordinal()
                                .rangeRoundBands([ padding[0], h - padding[2] ], 0.4);              
                                
            var xAxis = d3.svg.axis()
                            .scale(widthScale)
                            .orient("bottom");
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            var yAxis = d3.svg.axis()
                            .scale(heightScale)
                            .orient("left");
            
            var xAxis2 = d3.svg.axis()
                            .scale(widthScale3)
                            .orient("bottom");
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            var yAxis2 = d3.svg.axis()
                            .scale(heightScale2)
                            .orient("right");
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
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            d3.csv("traffic counts in the East Midlands 2007 - 2011 by hour on urban roads.csv", function(data) {
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                widthScale.domain([ 0, d3.max(data, function(d) {
                    return +d.bicycleCount;
                }) ]);
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                heightScale.domain(data.map(function(d) { return d.Row; } ));
                
                var datalength = d3.max(data, function(d) {
                    return +d.bicycleCount;
                })
                
                var colorScale = d3.scale.linear().domain([0, datalength ]).range(['#ddd', 'pink']);
                
                var rects = svg.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
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                rects.attr("x", padding[3])
                    .attr("y", function(d) {
                        return heightScale(d.Row);
                    })
                    .attr("width", function(d) {
                        return widthScale(d.bicycleCount);
                    })
                    .attr("height", heightScale.rangeBand())
                    .attr("fill", function(d,i) {
                    return colorScale(Math.round(d.bicycleCount))
                    })
                    .attr("stroke", function(d,i) {
                    return colorScale(Math.round(d.bicycleCount))
                    })
                    .append("title")
                    .text(function(d) {
                        return d3.round(d.bicycleCount,1) + " bicycles were recorded on average in the hour after" + " " + d.Hour + ":00 " + "on" + " " + d.RCat + " " + "roads";
                    });
                
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
                    .call(xAxis);
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                svg.append("g")
                .data(data)
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
                    
                svg.append("g")
                .append("text")
                .attr("transform", "translate(" + padding[3] + "," + (h/10 - padding[2]) + ")")
                .text("bicycles");
                    
            });
            
            d3.csv("traffic counts in the East Midlands 2007 - 2011 by hour on urban roads.csv", function(data1) {
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                widthScale2.domain([ d3.max(data1, function(d) {
                    return +d.motorbikeCount;
                }), 0 ]);
                widthScale3.domain([ 0, d3.max(data1, function(d) {
                    return +d.motorbikeCount;
                }) ]);
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                heightScale2.domain(data1.map(function(d) { return d.Row; } ));
                
                var datalength2 = d3.max(data1, function(d) {
                    return +d.motorbikeCount;
                })
                
                var colorScale2 = d3.scale.linear().domain([0, datalength2]).range(['#ddd', 'red']);
                
                var rects1 = svg.selectAll("rect1")
                                .data(data1)
                                .enter()
                                .append("rect");
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                rects1.attr("x", function(d) {
                        return (w/2 - widthScale2(d.motorbikeCount));
                    })
                    .attr("y", function(d) {
                        return heightScale2(d.Row);
                    })
                    .attr("width", function(d) {
                        return widthScale2(d.motorbikeCount);
                    })
                    .attr("height", heightScale2.rangeBand())
                    .attr("fill", function(d,i) {
                    return colorScale2(Math.round(d.motorbikeCount))
                    })
                    .attr("stroke", function(d,i) {
                    return colorScale2(Math.round(d.motorbikeCount))
                    })
                    .append("title")
                    .text(function(d) {
                        return d3.round(d.motorbikeCount,1) + " motorbikes were recorded on average in the hour after" + " " + d.Hour + ":00 " + "on" + " " + d.RCat + " " + "roads";
                    });
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                    var xtranslation = w/4 + padding[1] + padding[3]
                    var ytranslation = w/2
                    var ytranslation2 = w/2 - padding[3] + (padding[1] * 4)
                    
                svg.append("g")
                    .attr("class", "x axis2")
                    .attr("transform", "translate(" + xtranslation + "," + (h - padding[2]) + ")")
                    .call(xAxis2);
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                svg.append("g")
                .data(data1)
                    .attr("class", "y axis2")
                    .attr("transform", "translate(" + ytranslation + ",0)")
                    .call(yAxis2);
                
                svg.append("g")
                .append("text")
                .attr("transform", "translate(" + ytranslation2 + "," + (h/10 - padding[2]) + ")")
                .text("motorbikes");
                
            });
        </script>
​
    </body>
</html>
    