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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: teal; |
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} |
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.bar:hover { |
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fill: #bf6e11; |
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} |
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.axis { |
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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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.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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var margin = {top: 10, right: 60, bottom: 60, left: 60}, |
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width = 740 - margin.left - margin.right, |
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height = 500 - margin.top - margin.bottom; |
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var x = d3.scale.ordinal() |
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.rangeRoundBands([0, width], .1); |
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var y = d3.scale.linear() |
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.range([height, 0]); |
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var xAxis = d3.svg.axis() |
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.scale(x) |
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.orient("bottom"); |
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var yAxis = d3.svg.axis() |
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.scale(y) |
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.orient("left") |
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.ticks(10, "%"); |
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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.xml("data.xml", function(error, data) { |
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if (error) throw error; |
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// Convert the XML document to an array of objects. |
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// Note that querySelectorAll returns a NodeList, not a proper Array, |
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// so we must use map.call to invoke array methods. |
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data = [].map.call(data.querySelectorAll("letter"), function(letter) { |
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return { |
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letter: letter.getAttribute("id"), |
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frequency: +letter.querySelector("frequency").textContent |
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}; |
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}); |
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x.domain(data.map(function(d) { return d.letter; })); |
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y.domain([0, d3.max(data, function(d) { return d.frequency; })]); |
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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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svg.append("g") |
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.attr("class", "y axis") |
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.call(yAxis) |
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.append("text") |
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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("Frequency"); |
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svg.selectAll(".bar") |
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.data(data) |
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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.letter); }) |
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.attr("width", x.rangeBand()) |
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.attr("y", function(d) { return y(d.frequency); }) |
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.attr("height", function(d) { return height - y(d.frequency); }); |
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}); |
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</script> |
