This is a reimplementation of the Grouped Bar Chart by Mike Bostock. Although useful, I found the original's minimal comments and inverted axes hard to follow, so I created the version you see here.
Created
August 30, 2012 16:25
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Grouped bar
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| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> | |
| <html lang="en"> | |
| <head> | |
| <title>Grouped Bar Chart</title> | |
| <meta http-equiv="content-type" content="text/html; charset=utf-8"> | |
| <!-- JS --> | |
| <script type="text/javascript" src="http://code.jquery.com/jquery-1.7.min.js"></script> | |
| <script src="http://d3js.org/d3.v2.js"></script> | |
| <script type="text/javascript" src="main.js"></script> | |
| <script type="text/javascript"> | |
| $(document).ready(function () { | |
| main(); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <div id="vis"></div> | |
| </body> | |
| </html> |
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| function main() { | |
| // This is a reimplementation of the Grouped Bar Chart by Mike Bostock | |
| // (http://bl.ocks.org/882152). Although useful, I found the original's | |
| // minimal comments and inverted axes hard to follow, so I created the | |
| // version you see here. | |
| // First, we define sizes and colours... | |
| var outerW = 640; // outer width | |
| var outerH = 480; // outer height | |
| var padding = { t: 0, r: 0, b: 0, l: 0 }; | |
| var w = outerW - padding.l - padding.r; // inner width | |
| var h = outerH - padding.t - padding.b; // inner height | |
| var c = [ "#E41A1C", "#377EB8", "#4DAF4A" ]; // ColorBrewer Set 1 | |
| // Second, we define our data... | |
| // Create a two-dimensional array. | |
| // The first dimension has as many Array elements as there are series. | |
| // The second dimension has as many Number elements as there are groups. | |
| // It looks something like this... | |
| // var data = [ | |
| // [ 0.10, 0.09, 0.08, 0.07, 0.06, ... ], // series 1 | |
| // [ 0.10, 0.09, 0.08, 0.07, 0.06, ... ], // series 2 | |
| // [ 0.10, 0.09, 0.08, 0.07, 0.06, ... ] // series 3 | |
| // ]; | |
| var numberGroups = 10; // groups | |
| var numberSeries = 3; // series in each group | |
| var data = d3.range(numberSeries).map(function () { return d3.range(numberGroups).map(Math.random); }); | |
| // Third, we define our scales... | |
| // Groups scale, x axis | |
| var x0 = d3.scale.ordinal() | |
| .domain(d3.range(numberGroups)) | |
| .rangeBands([0, w], 0.2); | |
| // Series scale, x axis | |
| // It might help to think of the series scale as a child of the groups scale | |
| var x1 = d3.scale.ordinal() | |
| .domain(d3.range(numberSeries)) | |
| .rangeBands([0, x0.rangeBand()]); | |
| // Values scale, y axis | |
| var y = d3.scale.linear() | |
| .domain([0, 1]) // Because Math.random returns numbers between 0 and 1 | |
| .range([0, h]); | |
| // Visualisation selection | |
| var vis = d3.select("#vis") | |
| .append("svg:svg") | |
| .attr("width", outerW) | |
| .attr("height", outerH); | |
| // Series selection | |
| // We place each series into its own SVG group element. In other words, | |
| // each SVG group element contains one series (i.e. bars of the same colour). | |
| // It might be helpful to think of each SVG group element as containing one bar chart. | |
| var series = vis.selectAll("g.series") | |
| .data(data) | |
| .enter().append("svg:g") | |
| .attr("class", "series") // Not strictly necessary, but helpful when inspecting the DOM | |
| .attr("fill", function (d, i) { return c[i]; }) | |
| .attr("transform", function (d, i) { return "translate(" + x1(i) + ")"; }); | |
| // Groups selection | |
| var groups = series.selectAll("rect") | |
| .data(Object) // The second dimension in the two-dimensional data array | |
| .enter().append("svg:rect") | |
| .attr("x", 0) | |
| .attr("y", function (d) { return h - y(d); }) | |
| .attr("width", x1.rangeBand()) | |
| .attr("height", y) | |
| .attr("transform", function (d, i) { return "translate(" + x0(i) + ")"; }); | |
| } |
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