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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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.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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.bar { |
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fill: steelblue; |
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} |
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.x.axis path { |
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display: none; |
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} |
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</style> |
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<body> |
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<script src="//d3js.org/d3.v3.min.js"></script> |
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<script> |
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// Update to accept width and height |
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// put redraw into a method |
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class BarChart { |
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constructor(filename, width, height) { |
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this.width = width; |
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this.height = height; |
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this.filename = filename; |
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this.setup(); |
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} |
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start() { |
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this.grabData(this.filename, this.update.bind(this)) |
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} |
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grabData(filename, cb) { |
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d3.tsv(filename, type, cb) |
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} |
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setup() { |
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var margin = {top: 20, right: 30, bottom: 30, left: 40}; |
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this.width = this.width - margin.left - margin.right, |
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this.height = this.height - margin.top - margin.bottom; |
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this.x = d3.scale.ordinal() |
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.rangeRoundBands([0, this.width], 0.1, 0.2); |
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this.y = d3.scale.linear() |
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.range([this.height, 0]); |
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this.svg = d3.select("body").append("svg") |
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.attr("width", this.width + margin.left + margin.right) |
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.attr("height", this.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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} |
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update(error, letters) { |
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console.log(error); |
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// need to pull these out for d3 overwrites `this` in all of its callbacks |
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var x = this.x; |
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var y = this.y; |
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var height = this.height; |
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x.domain(letters.map(function (d) { |
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return d.letter; |
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})); |
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y.domain([0, d3.max(letters, function (d) { |
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return d.frequency; |
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})]); |
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this.svg.append("g") |
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.attr("class", "x axis") |
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.attr("transform", "translate(0," + this.height + ")") |
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.call(d3.svg.axis().scale(x).orient("bottom")); |
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this.svg.append("g") |
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.attr("class", "y axis") |
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.call(d3.svg.axis().scale(y).orient("left")); |
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this.svg.selectAll(".bar") |
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.data(letters) |
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.enter().append("rect") |
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.attr("class", "bar") |
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.attr("x", function (d) { |
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return x(d.letter); |
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}) |
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.attr("width", this.x.rangeBand()) |
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.attr("y", function (d) { |
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return y(d.frequency); |
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}) |
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.attr("height", function (d) { |
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return height - y(d.frequency); |
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}); |
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} |
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} |
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function type(d) { |
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d.frequency = +d.frequency; |
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return d; |
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} |
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var chart = new BarChart("letter-frequency.tsv", 960, 500); |
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chart.start(); |
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</script> |
