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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<svg width="960" height="500"></svg> |
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<script src="//d3js.org/d3.v4.min.js"></script> |
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<script> |
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// Commented version of |
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// https://bl.ocks.org/mbostock/3885211 |
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// Variables |
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var svg = d3.select("svg"), |
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margin = {top: 20, right: 20, bottom: 30, left: 50}, |
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width = svg.attr("width") - margin.left - margin.right, |
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height = svg.attr("height") - margin.top - margin.bottom; |
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// Date Parser takes in Date string and returns JS Data Object |
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var parseDate = d3.timeParse("%Y %b %d"); |
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// Define x, y, and z (color) scales |
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var x = d3.scaleTime().range([0, width]), |
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y = d3.scaleLinear().range([height, 0]), |
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z = d3.scaleOrdinal(d3.schemeCategory10); |
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// Define D3 Stack generator function |
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var stack = d3.stack(); |
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// Define D3 Area generator function |
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// "d" will come from the stack generator function |
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var area = d3.area() |
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.x(function(d, i) { return x(d.data.date); }) |
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.y0(function(d) { return y(d[0]); }) |
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.y1(function(d) { return y(d[1]); }); |
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// SVG G to provide D3 Margin Convention |
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var g = svg.append("g") |
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
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// Define variable to give us access to AJAX callback function data |
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var outsideData; |
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// CSV AJAX call to ingest data |
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// data file requested: data.csv |
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// function to process data: type |
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// - note function hoisting - type function is at the bottom |
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// function to be used on call back: function(error, data) {...} |
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d3.tsv("data.tsv", type, function(error, data) { |
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if (error) throw error; |
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// assign internal data variable to outsideData variable so we can see data |
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// once the AJAX callback function has been run. |
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outsideData = data; |
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// Get the keys by taking a slice off of the column headings |
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var keys = data.columns.slice(1); |
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// X axis domain is all the dates represented in the data |
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x.domain(d3.extent(data, function(d) { return d.date; })); |
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// Z color scale needs colors defined so use the keys |
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z.domain(keys); |
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// Use the keys array to define the keys operator of the stack generator function |
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stack.keys(keys); |
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// Data join |
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// Binds value returned from passing the data into stack generator function |
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// We are generating layers |
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// So each browser gets it's own layer. |
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var layer = g.selectAll(".layer") |
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.data(stack(data)) |
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.enter().append("g") |
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.attr("class", "layer"); |
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// For each "g.layer" element above, append a path |
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// Then use the area function to create the area shape based on the bound data |
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layer.append("path") |
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.attr("class", "area") |
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.style("fill", function(d) { return z(d.key); }) |
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.attr("d", area); |
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// Given data filter out any laayrs that are large enough to warrant labeling |
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// Then append text such that it inherits the __data__ property |
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// Then use that data property to place the text as well as create text designating the browser |
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layer.filter(function(d) { return d[d.length - 1][1] - d[d.length - 1][0] > 0.01; }) |
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.append("text") |
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.attr("x", width - 6) |
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.attr("y", function(d) { return y((d[d.length - 1][0] + d[d.length - 1][1]) / 2); }) |
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.attr("dy", ".35em") |
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.style("font", "10px sans-serif") |
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.style("text-anchor", "end") |
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.text(function(d) { return d.key; }); |
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// Create the X Axis |
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g.append("g") |
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.attr("class", "axis axis--x") |
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.attr("transform", "translate(0," + height + ")") |
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.call(d3.axisBottom(x)); |
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// Create the Y Axis |
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g.append("g") |
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.attr("class", "axis axis--y") |
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.call(d3.axisLeft(y).ticks(10, "%")); |
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}); |
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// Function to process the data when it gets ingested by the AJAX call |
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function type(d, i, columns) { |
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d.date = parseDate(d.date); |
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for (var i = 1, n = columns.length; i < n; ++i) d[columns[i]] = d[columns[i]] / 100; |
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return d; |
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} |
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</script> |
