Created
March 14, 2012 05:24
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Histogram with a normal distribution
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> | |
| <title>Histogram</title> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.v2.min.js"></script> | |
| <style type="text/css"> | |
| body { | |
| margin: 3em; | |
| } | |
| line { | |
| stroke: #ccc; | |
| stroke-width: 1px; | |
| } | |
| circle { | |
| fill: steelblue; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| // data generator | |
| var min = 0, | |
| max = 80000, | |
| stddev = 12000, | |
| bins = 18, | |
| generator = (function() { | |
| var gen = d3.random.normal(max/2, stddev); | |
| return function() { | |
| return ~~Math.max(min, Math.min(gen(), max)); | |
| } | |
| }()); | |
| var data = d3.range(bins).map(function() { return [] }); | |
| // chart | |
| var speed = 800, | |
| w = 300, | |
| h = 300, | |
| bw = w/bins, | |
| r = 3, | |
| padding = 3; | |
| var chart = d3.select('body').append('svg:svg') | |
| .attr('width', w+4) | |
| .attr('height', h+4) | |
| .append('svg:g') | |
| .attr('transform', 'translate(2,2)'); | |
| chart.append('svg:line') | |
| .attr('x1', 0) | |
| .attr('x2', w) | |
| .attr('y1', h) | |
| .attr('y2', h); | |
| chart.selectAll('line.v') | |
| .data(d3.range(bins+2)) | |
| .enter().append('svg:line') | |
| .attr('class', 'v') | |
| .attr('x1', function(d) { return d * bw }) | |
| .attr('x2', function(d) { return d * bw }) | |
| .attr('y1', 0) | |
| .attr('y2', h); | |
| var binCols = chart.selectAll('g.bin') | |
| .data(data) | |
| .enter().append('svg:g') | |
| .attr('class', 'bin') | |
| .attr('transform', function(d,i) { return 'translate(' + (i * bw) + ',0)' }); | |
| function redraw() { | |
| var dots = binCols.selectAll('circle') | |
| .data(function(d) { return d }); | |
| dots.enter().append('svg:circle') | |
| .attr('cx', bw/2) | |
| .attr('cy', 0) | |
| .attr('r', r); | |
| dots.transition() | |
| .duration(speed) | |
| .ease('bounce') | |
| .attr('cy', function(d,i) { | |
| return h - (i * (r*2 + padding) + padding*2) | |
| }); | |
| } | |
| var target = 100, | |
| counter = 0, | |
| intervalId = setInterval(function() { | |
| var number = generator(); | |
| // console.log(number); | |
| bin = ~~(number / max * bins); | |
| data[bin].push(number); | |
| redraw(); | |
| if (++counter > target) { | |
| clearInterval(intervalId); | |
| } | |
| }, speed); | |
| </script> | |
| </body> | |
| </html> |
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Nice work! I was wondering if you could advise on how to include a normally distributed radius 'r' (which I've worked out), but also how to include the individual 'r' values in the stacking height (can't seem to work that out). Many thanks for any suggestions.