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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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body { |
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font: 10px sans-serif; |
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} |
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.bar rect { |
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fill: steelblue; |
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shape-rendering: crispEdges; |
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} |
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.bar text { |
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fill: #fff; |
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} |
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.axis path, .axis line { |
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fill: none; |
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stroke: #000; |
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shape-rendering: crispEdges; |
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} |
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</style> |
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<body> |
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<script src="http://d3js.org/d3.v2.min.js?2.10.0"></script> |
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<script> |
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// Generate an Irwin–Hall distribution of 10 random variables. |
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var values = d3.range(50) |
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.map(d3.random.irwinHall(10)) |
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.map(function(d){ return {score: d, name: "John Smith" + d}; }); |
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// A formatter for counts. |
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var formatCount = d3.format(",.0f"); |
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var margin = {top: 10, right: 30, bottom: 30, left: 30}, |
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width = 960 - margin.left - margin.right, |
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height = 500 - margin.top - margin.bottom; |
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var x = d3.scale.linear() |
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.domain([0, 1]) |
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.range([0, width]); |
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// Generate a histogram using twenty uniformly-spaced bins. |
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var data = d3.layout.histogram() |
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.bins(x.ticks(20)) |
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(values.map(function(d){ return d.score; })); |
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var y = d3.scale.linear() |
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.domain([0, d3.max(data, function(d) { return d.y; })]) |
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.range([height, 0]); |
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var xAxis = d3.svg.axis() |
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.scale(x) |
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.orient("bottom"); |
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var svg = d3.select("body").append("svg") |
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.attr("width", width + margin.left + margin.right) |
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.attr("height", height + margin.top + margin.bottom) |
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.append("g") |
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
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var bar = svg.selectAll(".bar") |
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.data(data) |
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.enter().append("g") |
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.attr("class", "bar") |
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.attr("transform", function(d) { return "translate(" + x(d.x) + "," + y(d.y) + ")"; }); |
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bar.append("rect") |
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.attr("x", 1) |
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.attr("width", x(data[0].dx) - 1) |
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.attr("height", function(d) { return height - y(d.y); }) |
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.on('mouseover',function(d){ |
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console.log('data bound to bars ' + d); |
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console.log('names in bar ' + |
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values.filter(function(record){ return d.x <= record.score && record.score < d.x + d.dx; }) |
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.map(function(record){ return record.name; })); |
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}); |
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bar.append("text") |
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.attr("dy", ".75em") |
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.attr("y", 6) |
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.attr("x", x(data[0].dx) / 2) |
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.attr("text-anchor", "middle") |
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.text(function(d) { return formatCount(d.y); }); |
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svg.append("g") |
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.attr("class", "x axis") |
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.attr("transform", "translate(0," + height + ")") |
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.call(xAxis); |
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</script> |
