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<!DOCTYPE html> |
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<html> |
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<head> |
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<meta charset="utf-8"> |
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<title>Dancing percentage streamgraph</title> |
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<style type="text/css"> |
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text { |
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font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; |
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} |
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.title { |
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font-size: 20px; |
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} |
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.legend-row { |
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font-size: 18px; |
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} |
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.axis { |
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font-size: 12px; |
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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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.line { |
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fill: none; |
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stroke: #AAA; |
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stroke-width: 1px; |
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stroke-dasharray: 5,2; |
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stroke-linejoin: round; |
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stroke-linecap: round; |
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} |
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</style> |
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</head> |
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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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var margin = {top: 30, right: 30, bottom: 40, left: 50}, |
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width = 960 - margin.left - margin.right, |
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height = 500 - margin.top - margin.bottom, |
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legendWidth = 150, |
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legendHeight = 200, |
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OTHER = "Other"; |
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d3.csv("statistics.csv", ready) |
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.row(function(d) { return {year: +d.Year, nationality: d.Nationality, players: +d.Players}; }); |
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function ready(error, data) { |
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if (error) throw error; |
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// Group data by years. |
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var dataByYears = d3.map(); |
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data.forEach(function(d) { |
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if (!dataByYears.has(d.year)) { |
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dataByYears.set(d.year, { |
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countries: d3.map(), |
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totalPlayers: 0 |
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}); |
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} |
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if (dataByYears.get(d.year).countries.has(d.nationality)) { |
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throw new Error("Data error. Year " + d.year + " has 2 records for country " + d.nationality); |
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} |
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dataByYears.get(d.year).countries.set(d.nationality, { count: d.players }); // Later will store percentage. |
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dataByYears.get(d.year).totalPlayers += d.players; |
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}); |
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// Calculate percentage for each year/nationality. |
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dataByYears.forEach(function(year, yearData) { |
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yearData.countries.forEach(function(country, countryRecord) { |
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countryRecord.percentage = countryRecord.count / yearData.totalPlayers; |
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}); |
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}); |
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// Find max percentage for each encountered nationality. |
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var maxNationalityPercentage = d3.map(); |
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dataByYears.forEach(function(year, yearData) { |
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yearData.countries.forEach(function(country, countryRecord) { |
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var percentage = countryRecord.percentage; |
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if (!maxNationalityPercentage.has(country) |
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|| (percentage > maxNationalityPercentage.get(country).value)) { |
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maxNationalityPercentage.set(country, { value: percentage, year: year }); |
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} |
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}); |
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}); |
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// Convert the dictionary into array to display in table and to arrange countries. |
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var maxNationalityPercentageArray = []; |
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maxNationalityPercentage.forEach(function(country, record) { |
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maxNationalityPercentageArray.push({ |
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country: country, |
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value: record.value, |
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year: record.year |
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}); |
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}); |
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maxNationalityPercentageArray.sort(function(country1, country2) { |
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return country2.value - country1.value; |
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}); |
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// For investigating. |
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//showCountryMaxPercentageParticipation(maxNationalityPercentageArray); |
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// Select what countries to show separately, what to group into Other. |
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var countriesToShow = []; |
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maxNationalityPercentageArray.forEach(function(record) { |
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if (record.value >= 0.05) { |
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countriesToShow.push(record.country); |
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} |
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}); |
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var actualCountriesSet = d3.set(countriesToShow); |
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countriesToShow.push(OTHER); |
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// Get all years because cannot use years range because of skipped 2004-2005 season |
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// https://en.wikipedia.org/wiki/2004%E2%80%9305_NHL_season |
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var years = dataByYears.keys(); |
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years.sort(); |
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var layersData = d3.map(); |
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countriesToShow.forEach(function(country) { |
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layersData.set(country, { |
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key: country, |
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values: [] |
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}); |
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}); |
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// Populate each layer for each year. |
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years.forEach(function(year) { |
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var yearData = dataByYears.get(year); |
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var layerYearData = d3.map(); |
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// Init year data. |
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countriesToShow.forEach(function(country) { |
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layerYearData.set(country, { year: year, value: 0.0 }); |
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}); |
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// Put data in appropriate layers. |
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yearData.countries.forEach(function(country, countryRecord) { |
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var layerToIncrement = actualCountriesSet.has(country) ? country : OTHER; |
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layerYearData.get(layerToIncrement).value += countryRecord.percentage; |
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}); |
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// Collect year data into layersData. |
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layerYearData.forEach(function(country, countryLayerData) { |
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layersData.get(country).values.push(countryLayerData); |
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}); |
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}); |
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// Convert layer data into array in correct order. |
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var graphData = []; |
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countriesToShow.forEach(function(country) { |
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graphData.push(layersData.get(country)); |
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}); |
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var colorScale = d3.scale.category10(); |
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var stack = d3.layout.stack() |
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.values(function(d) { return d.values; }) |
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.x(function(d) { return d.year; }) |
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.y(function(d) { return d.value; }) |
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.offset(function(data, baselineLayer) { |
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var j = -1, |
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i = 0, |
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m = data[0].length, |
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y0 = []; |
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while (++j < m) { |
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var offset = 0; |
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for (i = 0; i < baselineLayer; i++) { |
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offset += data[i][j][1]; |
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} |
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y0[j] = -offset; |
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} |
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return y0; |
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}); |
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var stackedData = stack(graphData, 0); |
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var xScale = d3.scale.ordinal() |
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.domain(years) |
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.rangePoints([0, width - legendWidth - 20], 0); |
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var yScale = d3.scale.linear() |
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.domain([0.0, 1.0]) |
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.range([height/2, 0]); // Make the range so that smallest values are at the bottom. |
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// Make yAxisScale twice as bigger to cover negative values. |
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var yAxisScale = d3.scale.linear() |
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.domain([-1.0, 1.0]) |
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.range([height, 0]); |
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var area = d3.svg.area() |
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.x(function(d) { return xScale(d.year); }) |
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.y0(function(d) { return yScale(d.y0); }) |
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.y1(function(d) { return yScale(d.y0 + d.value); }); |
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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 graphGroup = svg.append("g"); |
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var updateGraph = function(baselineLayer, suppressAnimation) { |
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var graphPaths = graphGroup.selectAll("path") |
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.data(stack(graphData, baselineLayer)); |
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graphPaths.enter().append("path"); |
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graphPaths |
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.on("click", function(d, i) { |
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updateGraph(i); |
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}); |
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graphPaths |
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.transition().duration(suppressAnimation ? 0 : 750) |
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.attr("d", function(d) { return area(d.values); }) |
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.style("fill", function(d, i) { return colorScale(i); }); |
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}; |
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updateGraph(0, /*suppressAnimation =*/true); |
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// Axes. |
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var xAxis = d3.svg.axis() |
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.scale(xScale) |
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.orient("bottom") |
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.tickValues(yearTickValues(years)) |
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svg.append("g") |
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.attr("class", "axis x-axis") |
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.attr("transform", "translate(0, " + height/2 + ")") |
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.call(xAxis); |
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var yAxis = d3.svg.axis() |
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.scale(yAxisScale) |
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.orient("left") |
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.tickFormat(d3.format(".0%")); |
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svg.append("g") |
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.attr("class", "axis y-axis") |
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.call(yAxis); |
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// Grid lines. |
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var yGridValues = yAxisScale.ticks(yAxis.ticks()); |
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yGridValues = yGridValues.filter(function(d) { return (0 < d) && (d < 1.0); }); |
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var gridData = []; |
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var xRange = xScale.range(); |
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xRangeMin = xRange[0], |
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xRangeMax = xRange[xRange.length - 1]; |
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yGridValues.forEach(function(yGridTick) { |
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gridData.push([ |
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[xRangeMin, yAxisScale(yGridTick)], |
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[xRangeMax, yAxisScale(yGridTick)] |
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]); |
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}); |
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svg.append("g").selectAll("path") |
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.data(gridData) |
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.enter().append("path") |
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.attr("class", "line") |
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.attr("d", d3.svg.line()); |
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// Legend. |
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var legendYScale = d3.scale.linear() |
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.domain([0, countriesToShow.length]) |
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.range([0, legendHeight]); |
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var legendGroup = svg.append("g") |
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.attr("transform", "translate(" + (width - legendWidth) + ", 0)"); |
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var legendRows = legendGroup.selectAll(".legend-row") |
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.data(countriesToShow) |
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.enter().append("g") |
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.attr("class", "legend-row") |
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.attr("transform", function(d, i) { return "translate(0, " + legendYScale(i) + ")"; }); |
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legendRows.append("rect") |
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.attr({x: 0, y: 0, width: 20, height: 20}) |
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.style("fill", function(d, i) { return colorScale(i); }); |
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legendRows.append("text") |
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.attr({x: 30, y: 17}) |
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.text(function(d) { return d; }); |
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legendRows.selectAll("rect") |
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.on("click", function(d, rectIndexInRow, rowIndex) { |
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updateGraph(rowIndex); |
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}); |
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// Title. |
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svg.append("text") |
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.attr("x", (xRangeMax + xRangeMin) / 2) |
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.attr("y", -margin.top / 2) |
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.attr("text-anchor", "middle") |
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.attr("class", "title") |
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.text("NHL Players by Nationality"); |
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} |
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// Helper function to investigate countries below which threshold should be put in Other category. |
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function showCountryMaxPercentageParticipation(maxNationalityPercentageArray) { |
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var table = d3.select("body").append("table"); |
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var rows = table.selectAll("tr") |
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.data(maxNationalityPercentageArray) |
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.enter() |
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.append("tr"); |
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rows.append("td").html(function(d) { return d.country; }); |
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rows.append("td").html(function(d) { return d.value; }); |
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rows.append("td").html(function(d) { return d.year; }); |
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} |
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function yearTickValues(years) { |
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var result = [years[0]]; |
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years.forEach(function(year) { |
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if (year % 10 == 0) { |
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result.push(year); |
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} |
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}); |
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result.push(years[years.length - 1]); |
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return result; |
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} |
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</script> |
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</body> |
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</html> |
