This example uses topojson.mesh to highlight California’s borders with its three neighboring states.
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Border Mesh
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| license: gpl-3.0 | |
| height: 600 | |
| border: no |
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| <!DOCTYPE html> | |
| <svg width="960" height="600" fill="none" stroke-linejoin="round" stroke-linecap="round"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"); | |
| var path = d3.geoPath(); | |
| d3.json("https://d3js.org/us-10m.v1.json", function(error, us) { | |
| if (error) throw error; | |
| svg.append("g") | |
| .attr("fill", "#000") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.states).features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .append("title") | |
| .text(function(d) { return d.id; }); | |
| svg.append("path") | |
| .attr("stroke", "#fff") | |
| .attr("stroke-width", 0.5) | |
| .attr("d", path(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))); | |
| // California-Nevada border | |
| svg.append("path") | |
| .attr("stroke", "cyan") | |
| .attr("stroke-width", 2.5) | |
| .attr("d", path(topojson.mesh(us, us.objects.states, border("06", "32")))); | |
| // California-Arizona border | |
| svg.append("path") | |
| .attr("stroke", "magenta") | |
| .attr("stroke-width", 2.5) | |
| .attr("d", path(topojson.mesh(us, us.objects.states, border("06", "04")))); | |
| // California-Oregon border | |
| svg.append("path") | |
| .attr("stroke", "yellow") | |
| .attr("stroke-width", 2.5) | |
| .attr("d", path(topojson.mesh(us, us.objects.states, border("06", "41")))); | |
| }); | |
| function border(id0, id1) { | |
| return function(a, b) { | |
| return a.id === id0 && b.id === id1 | |
| || a.id === id1 && b.id === id0; | |
| }; | |
| } | |
| </script> |
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