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<!DOCTYPE html> |
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<head> |
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<meta charset="utf-8"> |
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<script src="https://d3js.org/d3.v4.min.js"></script> |
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<style> |
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body { margin:0; position:fixed; top:0; right:0; bottom:0; left:0; } |
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.surplus-deficit-area { |
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fill: black; |
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opacity: 0.1; |
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} |
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.surplus-deficit-line { |
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fill: none; |
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stroke: black; |
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} |
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.title { |
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font-family: sans-serif; |
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} |
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</style> |
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</head> |
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<body> |
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<script> |
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var margin = {top: 100, right: 100, bottom: 100, left: 100}; |
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var 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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var defs = svg.append("defs"); |
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var parseYear = d3.timeParse("%Y"); |
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var x = d3.scaleTime() |
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.range([0, width]); |
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var y = d3.scaleLinear() |
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.range([height, 0]); |
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var xAxis = d3.axisBottom() |
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.scale(x); |
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var yAxis = d3.axisLeft() |
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.scale(y); |
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function parse(d) { |
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return { |
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date: parseYear(d.year), |
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deficit: +d.deficit_percent |
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}; |
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} |
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var area = d3.area() |
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.x(function(d) { return x(d.date); }) |
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.y1(function(d) { return y(d.deficit); }); |
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var line = d3.line() |
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.x(function(d) { return x(d.date); }) |
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.y(function(d) { return y(d.deficit); }); |
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d3.queue() |
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.defer(d3.csv, "budget-deficit-gdp.csv", parse) |
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.await(ready); |
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function ready(error, data) { |
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if (error) throw error; |
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x.domain(d3.extent(data, function(d) { return d.date; })); |
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y.domain([Math.floor(d3.min(data, function(d) { return d.deficit; })), |
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Math.ceil(d3.max(data, function(d) { return d.deficit; }))]); |
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area.y0(y(0)); |
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defs.append("mask") |
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.attr("id", "mask1") |
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.append("path") |
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.attr("d", function() { |
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return area(data); |
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}) |
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.attr("fill", "white") |
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.attr("opacity", 0.5) |
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svg.append("rect") |
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.attr("x", 0) |
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.attr("y", 0) |
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.attr("width", width) |
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.attr("height", y(0)) |
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.attr("fill", "green") |
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.attr("mask", "url(#mask1)"); |
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svg.append("rect") |
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.attr("x", 0) |
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.attr("y", y(0)) |
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.attr("width", width) |
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.attr("height", y.range()[0] - y(0)) |
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.attr("fill", "red") |
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.attr("mask", "url(#mask1)"); |
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svg.append("path") |
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.datum(data) |
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.attr("class", "surplus-deficit-line") |
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.attr("d", line) |
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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("text") |
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.attr("class", "title") |
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.attr("transform", "translate(" + width / 2 + ",0)") |
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.attr("dy", "-2em") |
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.attr("text-anchor", "middle") |
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.text("UK government deficit / surplus as percentage of GDP"); |
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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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} |
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</script> |
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</body> |
