This is an example of Nuts2json API showing European Union countries with D3.js with a coastal margin.
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December 24, 2019 09:54
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Coastal margin with CSS stroke-width
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| license: EUPL-1.2 | |
| height: 800 | |
| scrolling: no | |
| border: no | |
| redirect: https://observablehq.com/@jgaffuri/coastal-margin-with-css-stroke-width |
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| <!DOCTYPE html> | |
| <svg></svg> | |
| <link rel="stylesheet" type="text/css" href="style.css"> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <script src="https://d3js.org/d3-request.v1.min.js"></script> | |
| <script src="https://d3js.org/topojson.v3.min.js"></script> | |
| <script src="https://d3js.org/d3-color.v1.min.js"></script> | |
| <script src="https://d3js.org/d3-interpolate.v1.min.js"></script> | |
| <script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script> | |
| <script> | |
| d3.json("https://raw.githubusercontent.com/eurostat/Nuts2json/master/2016/3035/20M/0.json", | |
| function (error, nuts) { | |
| if (error) throw error; | |
| //prepare SVG element | |
| var width = 900, height = width * (nuts.bbox[3] - nuts.bbox[1]) / (nuts.bbox[2] - nuts.bbox[0]), | |
| svg = d3.select("svg").attr("width", width).attr("height", height), | |
| path = d3.geoPath().projection(d3.geoIdentity() | |
| .reflectY(true).fitSize([width, height], topojson.feature(nuts, nuts.objects.gra))); | |
| //draw coastal margin | |
| for (var i = 1; i >= 0; i -= 0.1) | |
| svg.append("g").selectAll("path").data(topojson.feature(nuts, nuts.objects.nutsbn).features) | |
| .enter().append("path")/*.filter(function(bn){ return bn.properties.co === 'T'; })*/.attr("d", path) | |
| .attr("class", "cmarg") | |
| .style("stroke-width", (i * 140) + "px") | |
| .style("stroke", d3.interpolateBlues(1-Math.sqrt(i))); | |
| //draw regions | |
| svg.append("g").selectAll("path").data(topojson.feature(nuts, nuts.objects.nutsrg).features) | |
| .enter().append("path").attr("d", path) | |
| .attr("class", "rg"); | |
| //draw boundaries | |
| svg.append("g").selectAll("path").data(topojson.feature(nuts, nuts.objects.nutsbn).features) | |
| .enter().append("path").filter(function (bn) { return bn.properties.co === 'F'; }).attr("d", path) | |
| .attr("class", "bn"); | |
| }); | |
| </script> |
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| .cmarg { | |
| fill: none; | |
| stroke-linecap: round; | |
| stroke-linejoin: round; | |
| } | |
| .rg { | |
| fill: #e9e9e9; | |
| } | |
| .rg:hover { | |
| fill: #ff7f00; | |
| } | |
| .bn { | |
| fill: none; | |
| stroke-width: 1px; | |
| stroke: rgb(75, 75, 75); | |
| } |
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