An animated "arithmopleth" map of UK unemployement rates (where available).
Inspired by Andrew Mollica's Arithmopleth Map
Last active
July 24, 2017 13:16
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Arithmopleth Map
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <style> | |
| html { | |
| font-family: monospace; | |
| } | |
| .constituency { | |
| fill: none; | |
| stroke-width: 0.25; | |
| stroke: #c9c9c9; | |
| } | |
| text { | |
| opacity: 0.8; | |
| cursor: default; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var svgWidth = 960, | |
| svgHeight = 500; | |
| var margin = {top: 20, right: 10, bottom: 20, left: 10}; | |
| var width = svgWidth - margin.left - margin.right, | |
| height = svgHeight - margin.top - margin.bottom; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var dataUrl = "https://raw.githubusercontent.com/ft-interactive/ge2017-dataset/master/financialTimes_ge2017_dataset.csv" | |
| d3.queue() | |
| .defer(d3.csv, dataUrl) | |
| .defer(d3.json, "topo_wpc.json") | |
| .await(ready); | |
| function ready(error, data, uk) { | |
| if (error) throw error; | |
| var dataObject = {}; | |
| data.forEach(function(d, i) { | |
| dataObject[d.PCON15CD] = d; | |
| }); | |
| var constituencies = topojson.feature(uk, uk.objects.wpc).features; | |
| var projection = d3.geoAlbers() | |
| .fitSize([width, height], topojson.feature(uk, uk.objects.wpc)); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| var centroids = []; | |
| constituencies.map(function(d) { | |
| var centroid = path.centroid(d); | |
| var info = dataObject[d.id]; | |
| var attr = "econ_unemploymentRate_2015"; | |
| if (info) { | |
| if (info[attr] != "NA") { | |
| var datum = { | |
| x: centroid[0], | |
| y: centroid[1], | |
| value: +info[attr] | |
| } | |
| centroids.push(datum); | |
| } | |
| } | |
| }); | |
| var range = d3.extent(centroids, function(d) { return Math.round(d.value)} ); | |
| var colour = d3.scaleSequential(d3.interpolateMagma) | |
| .domain(range); | |
| svg.selectAll("path") | |
| .data(constituencies) | |
| .enter().append("path") | |
| .attr("class", "constituency") | |
| .attr("d", path); | |
| var numbers = svg.selectAll("text") | |
| .data(centroids) | |
| .enter().append("text") | |
| .attr("class", "values") | |
| .attr("x", function(d) { return d.x }) | |
| .attr("y", -25) | |
| .style("text-anchor", "middle") | |
| .style("font-size", "8px") | |
| .style("fill", function(d) { return colour(Math.round(d.value)); }) | |
| .text(function(d) { return Math.round(d.value) }) | |
| .on("mouseover", function() { | |
| d3.select(this) | |
| .transition() | |
| .style("font-size", "16px"); | |
| }) | |
| .on("mouseout", function() { | |
| d3.select(this) | |
| .transition() | |
| .style("font-size", "8px"); | |
| }) | |
| numbers | |
| .transition() | |
| .duration(1000) | |
| .delay(function(d, i) { return i * 5 }) | |
| .attr("x", function(d) { return d.x }) | |
| .attr("y", function(d) { return d.y }) | |
| } | |
| </script> | |
| </body> |
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