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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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.bar { |
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fill: #5AC; |
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opacity: 0.6; |
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} |
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.axis { |
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font: 12px sans-serif; |
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} |
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.axis path, |
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.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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.brush .extent { |
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stroke: #fff; |
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fill-opacity: .125; |
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shape-rendering: crispEdges; |
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} |
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.fname { |
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font: 12px sans-serif; |
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font-weight: bold; |
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} |
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.modetext { |
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font: 12px sans-serif; |
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} |
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</style> |
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<body> |
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<script src="http://d3js.org/d3.v3.min.js"></script> |
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<script> |
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/* Given the raw bins (the distribution) and a point, estimate |
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* the total population up to that point. |
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*/ |
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function sum(rawBins, value, trapInterpolateMode) { |
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var total = 0; |
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for (var i = 0; i < rawBins.length; i++) { |
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var bin = rawBins[i]; |
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if ((bin.exact && value >= bin.mean) || value >= bin.next) { |
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total += bin.pop; |
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} else if (!bin.exact && value > bin.prev && value <= bin.mean) { |
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var range = (bin.mean - value) / (bin.mean - bin.prev); |
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var area = 1 - range; |
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// Optionally, square the area for trapezoidal interpolation |
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if (trapInterpolateMode) area = area * area; |
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total += area * bin.pop / 2; |
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} else if (value > bin.mean && value <= bin.next) { |
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var range = (value - bin.mean) / (bin.next - bin.mean); |
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var area = 1 - range; |
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// Optionally, square the area for trapezoidal interpolation |
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if (trapInterpolateMode) area = area * area; |
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total += bin.pop / 2 + (1 - area) * bin.pop / 2; |
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} |
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} |
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return total; |
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} |
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/* Loads the distribution into a convenient format. */ |
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function loadRawBins(data) { |
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var bins = []; |
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if ("bins" in data.summary) { |
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var sbins = data.summary.bins; |
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minimum = data.summary.minimum; |
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maximum = data.summary.maximum; |
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for (var i = 0; i < sbins.length; i++) { |
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var bin = {mean: sbins[i][0], pop: sbins[i][1]}; |
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if (bin.pop == 1 || bin.mean == minimum || bin.mean == maximum) { |
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bin.exact = true; |
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} else { |
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bin.exact = false; |
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if (i > 0) { |
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bin.prev = sbins[i-1][0]; |
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} else { |
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bin.prev = minimum; |
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} |
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if (i < sbins.length - 1) { |
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bin.next = sbins[i+1][0]; |
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} else { |
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bin.next = maximum; |
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} |
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} |
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bins[i] = bin; |
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} |
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} else { |
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sbins = data.summary.counts; |
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for (var i = 0; i < sbins.length; i++) { |
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var bin = {mean: sbins[i][0], pop: sbins[i][1], exact: true}; |
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bins[i] = bin; |
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} |
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} |
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return bins; |
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} |
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/* Build equidistant bins for visualization given the |
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* raw bins and a range. |
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*/ |
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function buildViz(rawBins, range, vizBinCount, roundMode, trapInterpolateMode) { |
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var vizBins = []; |
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var maxPop = 0; |
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var inc = (range[1] - range[0]) / vizBinCount; |
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// Using a slight shift to act like a closed interval |
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var shift = 0.0000001; |
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var prev = range[0] - shift; |
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var prevPop = sum(rawBins, prev, trapInterpolateMode); |
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for (var i = 0; i < vizBinCount; i++) { |
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var next = prev + inc; |
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var nextPop = sum(rawBins, next, trapInterpolateMode); |
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var pop = nextPop - prevPop; |
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if (roundMode) { |
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pop = Math.round(pop); |
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} |
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maxPop = Math.max(maxPop, pop); |
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vizBins[i] = {range: [prev + shift, next], pop: pop}; |
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prev = next; |
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prevPop = nextPop; |
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} |
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return {bins: vizBins, maxPop: maxPop, range: range}; |
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} |
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function capitalize(term) { |
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return term.charAt(0).toUpperCase() + term.slice(1); |
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} |
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function trimRange(fullRange, rawBins, buffer, segments) { |
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var total = 0; |
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for (var i = 0; i < rawBins.length; i++) { |
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total += rawBins[i].pop; |
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} |
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var interval = (fullRange[1] - fullRange[0]) / segments; |
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var start = fullRange[0]; |
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var startThreshold = total * buffer; |
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for (var i = 0; i < segments; i++) { |
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if (sum(rawBins, start, false) > startThreshold) break; |
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start += interval; |
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} |
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if (start > fullRange[0]) start -= interval; |
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var end = fullRange[1]; |
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var endThreshold = total - (total * buffer); |
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for (var i = 0; i < segments; i++) { |
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if (sum(rawBins, end, false) < endThreshold) break; |
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end -= interval; |
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} |
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if (end < fullRange[1]) end += interval; |
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return [start, end]; |
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} |
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/* Add a small buffer to either side of the requested range */ |
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function bufferRange(range, vizBinCount) { |
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var buffer = 0.5 * (range[1] - range[0]) / vizBinCount; |
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return [range[0] - buffer, range[1] + buffer]; |
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} |
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var margin = {top: 30, right: 40, bottom: 30, left: 40}, |
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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 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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d3.json("hist.json", function(error, data) { |
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var rawBins = loadRawBins(data); |
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var x, y; |
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var xAxis, yAxis; |
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var xAxisG, yAxisG; |
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var vizBinCount = 32; |
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var baseRange = [data.summary.minimum, data.summary.maximum]; |
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var initRange = bufferRange(baseRange, vizBinCount); |
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var trimmedInitRange = trimRange(baseRange, rawBins, 0.01, vizBinCount); |
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trimmedInitRange = bufferRange(trimmedInitRange, vizBinCount); |
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// By default trim the edges of the distribution |
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var trimMode = true; |
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var resetRange = trimmedInitRange; |
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var roundMode = false; |
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var trapInterpolateMode = false; |
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var viz = buildViz(rawBins, resetRange, vizBinCount, roundMode, trapInterpolateMode); |
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init(); |
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function init() { |
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x = d3.scale.linear() |
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.domain(viz.range) |
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.range([0, width], .1); |
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y = d3.scale.linear() |
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.domain([0, viz.maxPop]) |
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.range([height, 0]); |
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svg.selectAll(".bar") |
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.data(viz.bins) |
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.enter().append("rect") |
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.attr("class", "bar") |
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.attr("x", function(d) { return x(d.range[0]) + 1; }) |
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.attr("width", function(d) { return x(d.range[1]) - x(d.range[0]) - 2; }) |
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.attr("y", function(d) { return y(d.pop);}) |
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.attr("height", function(d) { return height - y(d.pop); }); |
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xAxis = d3.svg.axis() |
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.ticks(Math.round(width / 60)) |
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.scale(x) |
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.orient("bottom"); |
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yAxis = d3.svg.axis() |
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.ticks(Math.round(height / 30)) |
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.scale(y) |
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.orient("left"); |
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xAxisG = 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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xAxisG.append("text") |
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.attr("class", "fname") |
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.attr("y", -16) |
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.attr("x", width) |
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.attr("dy", ".71em") |
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.style("text-anchor", "end") |
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.text(capitalize(data.name)); |
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yAxisG = svg.append("g") |
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.attr("class", "y axis") |
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.call(yAxis); |
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yAxisG.append("text") |
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.attr("class", "fname") |
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.attr("transform", "rotate(-90)") |
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.attr("y", 6) |
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.attr("dy", ".71em") |
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.style("text-anchor", "end") |
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.text("Population"); |
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var trimText = svg.append("text") |
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.attr("class", "modetext") |
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.attr("x", width - 150) |
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.attr("y", 10) |
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.style("text-anchor", "start") |
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.text("(T)rimming: On"); |
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var roundText = svg.append("text") |
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.attr("class", "modetext") |
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.attr("x", width - 150) |
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.attr("y", 25) |
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.style("text-anchor", "start") |
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.text("(R)ounding: Off"); |
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var interpolateText = svg.append("text") |
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.attr("class", "modetext") |
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.attr("x", width - 150) |
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.attr("y", 40) |
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.style("text-anchor", "start") |
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.text("(I)nterpolation: Linear"); |
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d3.select("body") |
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.on("keydown", function(d) { |
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if (d3.event.keyCode == 84) { |
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// t = 84 |
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trimMode = !trimMode; |
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if (trimMode) { |
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resetRange = trimmedInitRange; |
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trimText.text("(T)rimming: On"); |
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} else { |
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resetRange = initRange; |
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trimText.text("(T)rimming: Off"); |
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} |
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update(rawBins, resetRange, vizBinCount); |
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} else if (d3.event.keyCode == 82) { |
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// r = 82 |
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roundMode = !roundMode; |
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if (roundMode) { |
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roundText.text("(R)ounding: On"); |
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} else { |
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roundText.text("(R)ounding: Off"); |
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} |
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update(rawBins, viz.range, vizBinCount); |
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} else if (d3.event.keyCode == 73) { |
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// i = 73 |
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trapInterpolateMode = !trapInterpolateMode; |
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if (trapInterpolateMode) { |
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interpolateText.text("(I)nterpolation: Trapezoidal"); |
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} else { |
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interpolateText.text("(I)nterpolation: Linear"); |
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} |
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update(rawBins, viz.range, vizBinCount); |
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} |
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}); |
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} |
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function update(rawBins, range, vizBinCount) { |
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var animationDuration = 700; |
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viz = buildViz(rawBins, range, vizBinCount, roundMode, trapInterpolateMode); |
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x = d3.scale.linear() |
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.domain(viz.range) |
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.range([0, width], .1); |
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y = d3.scale.linear() |
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.domain([0, viz.maxPop]) |
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.range([height, 0], .1); |
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svg.selectAll(".bar") |
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.data(viz.bins) |
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.transition().duration(animationDuration) |
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.attr("y", function(d) { return y(d.pop);}) |
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.attr("height", function(d) { return height - y(d.pop); }); |
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xAxis = d3.svg.axis() |
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.ticks(Math.round(width / 60)) |
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.scale(x) |
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.orient("bottom"); |
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yAxis = d3.svg.axis() |
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.ticks(Math.round(height / 30)) |
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.scale(y) |
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.orient("left"); |
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xAxisG.transition().duration(animationDuration).call(xAxis); |
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yAxisG.transition().duration(animationDuration).call(yAxis); |
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} |
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var brushX = d3.scale.identity().domain([0, width]); |
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var brushExtent; |
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var brush = d3.svg.brush() |
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.x(brushX) |
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.on("brush", brushed) |
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.on("brushend", brushended); |
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var gBrush = svg.append("g") |
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.attr("class", "brush") |
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.call(brush) |
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.call(brush.event); |
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gBrush.selectAll("rect") |
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.attr("height", height); |
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function brushed() { |
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brushExtent = brush.extent(); |
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} |
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function brushended() { |
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if (!d3.event.sourceEvent) return; // only transition after input |
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var start = x.invert(brushExtent[0]); |
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var end = x.invert(brushExtent[1]); |
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d3.select(this).call(brush.extent([[0], [0]])); |
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if (start == end) { |
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update(rawBins, resetRange, vizBinCount); |
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} else { |
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update(rawBins, bufferRange([start, end], vizBinCount), vizBinCount); |
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} |
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} |
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}); |
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</script> |
