This example is out-of-date; I prefer this newer histogram example that places the tick marks between bars. However, the implementation still stands as an example of the reusable chart module pattern.
forked from mbostock's block: Histogram Chart
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June 5, 2017 20:08
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Histogram Chart
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| license: gpl-3.0 |
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| function histogramChart() { | |
| var margin = {top: 0, right: 0, bottom: 20, left: 0}, | |
| width = 960, | |
| height = 500; | |
| var histogram = d3.layout.histogram(), | |
| x = d3.scale.ordinal(), | |
| y = d3.scale.linear(), | |
| xAxis = d3.svg.axis().scale(x).orient("bottom").tickSize(6, 0); | |
| function chart(selection) { | |
| selection.each(function(data) { | |
| // Compute the histogram. | |
| data = histogram(data); | |
| // Update the x-scale. | |
| x .domain(data.map(function(d) { return d.x; })) | |
| .rangeRoundBands([0, width - margin.left - margin.right], .1); | |
| // Update the y-scale. | |
| y .domain([0, d3.max(data, function(d) { return d.y; })]) | |
| .range([height - margin.top - margin.bottom, 0]); | |
| // Select the svg element, if it exists. | |
| var svg = d3.select(this).selectAll("svg").data([data]); | |
| // Otherwise, create the skeletal chart. | |
| var gEnter = svg.enter().append("svg").append("g"); | |
| gEnter.append("g").attr("class", "bars"); | |
| gEnter.append("g").attr("class", "x axis"); | |
| // Update the outer dimensions. | |
| svg .attr("width", width) | |
| .attr("height", height); | |
| // Update the inner dimensions. | |
| var g = svg.select("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| // Update the bars. | |
| var bar = svg.select(".bars").selectAll(".bar").data(data); | |
| bar.enter().append("rect"); | |
| bar.exit().remove(); | |
| bar .attr("width", x.rangeBand()) | |
| .attr("x", function(d) { return x(d.x); }) | |
| .attr("y", function(d) { return y(d.y); }) | |
| .attr("height", function(d) { return y.range()[0] - y(d.y); }) | |
| .order(); | |
| // Update the x-axis. | |
| g.select(".x.axis") | |
| .attr("transform", "translate(0," + y.range()[0] + ")") | |
| .call(xAxis); | |
| }); | |
| } | |
| chart.margin = function(_) { | |
| if (!arguments.length) return margin; | |
| margin = _; | |
| return chart; | |
| }; | |
| chart.width = function(_) { | |
| if (!arguments.length) return width; | |
| width = _; | |
| return chart; | |
| }; | |
| chart.height = function(_) { | |
| if (!arguments.length) return height; | |
| height = _; | |
| return chart; | |
| }; | |
| // Expose the histogram's value, range and bins method. | |
| d3.rebind(chart, histogram, "value", "range", "bins"); | |
| // Expose the x-axis' tickFormat method. | |
| d3.rebind(chart, xAxis, "tickFormat"); | |
| return chart; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| .bars rect { | |
| fill: steelblue; | |
| } | |
| .axis text { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="histogram-chart.js"></script> | |
| <script> | |
| d3.select("body") | |
| .datum(irwinHallDistribution(10000, 10)) | |
| .call(histogramChart() | |
| .bins(d3.scale.linear().ticks(20)) | |
| .tickFormat(d3.format(".02f"))); | |
| function irwinHallDistribution(n, m) { | |
| var distribution = []; | |
| for (var i = 0; i < n; i++) { | |
| for (var s = 0, j = 0; j < m; j++) { | |
| s += Math.random(); | |
| } | |
| distribution.push(s / m); | |
| } | |
| return distribution; | |
| } | |
| </script> | |
| <body> | |
| </html> |
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