D3 Examples - The number of CCTV cameras by region in Seoul, Korea

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Scale and Axis</title>
    <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
    <style type="text/css">
            
            body {
                background-color: white;
                font-family: Helvetica, Arial, sans-serif;
            }
​
            h1 {
                font-size: 24px;
                margin: 0;
            }
​
            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
​
            svg {
                background-color: white;
            }
​
            rect:hover {
                fill: #18709C;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: #aaaaaa;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
​
            .y.axis path,
            .y.axis line {
                opacity: 0;
            }
​
        </style>
</head>
<body>
    <h1>The number of CCTV cameras by region in Seoul, Korea</h1>
    <script type="text/javascript">
    var w = 800;
    var h = 600;
    var padding = [ 30, 30, 30, 100 ]; 
​
​
​
    var widthScale = d3.scale.linear()
                    .range([ 0, w - padding[1] - padding[3] ]);
            
    var heightScale = d3.scale.ordinal()
                    .rangeRoundBands([ padding[0], h - padding[2] ], 0.3);
​
​
​
    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("data.csv", function(error, data) { 
    
    data.sort(function(a, b) {
                    return d3.descending(+a.value, +b.value);
                });
​
                widthScale.domain([ 0, d3.max(data, function(d) {
                    return +d.value;
                }) ]);
​
                heightScale.domain(data.map(function(d) { return d.area; } ));
​
                var rects = svg.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
​
                rects.attr("x", padding[3])
                    .attr("y", function(d) {
                        return heightScale(d.area);
                    })
                    .attr("width", function(d) {
                        return widthScale(d.value);
                    })
                    .attr("height", heightScale.rangeBand())
                    .attr("fill","#4DAAAB");
​
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
                    .call(xAxis);
​
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
​
                var texts = svg.selectAll(".datatext")
                .data(data)
                .enter()
                .append("text");
​
                texts.attr("x", function(d) {
                    return widthScale(d.value)+ padding[3]+5;
                    })
                    .attr("y", function(d) {
                        return heightScale(d.area)+10;
                    })
                    .attr("fill","#777777")
                    .text(function(d) { return d.value;})
                    .attr("font-size","11px");
    });
    </script>
</body>
</html>
    