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Mapping Nebraska school districts with D3 v4
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| <!DOCTYPE html> | |
| <style> | |
| .districts { | |
| fill: steelblue; | |
| } | |
| .districts :hover { | |
| fill: red; | |
| } | |
| .district-borders { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 0.5px; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| pointer-events: none; | |
| } | |
| </style> | |
| <svg width="960" height="600"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v2.min.js"></script> | |
| <script src="https://d3js.org/d3-queue.v3.min.js"></script> | |
| <script> | |
| var svg = d3.select('svg'); | |
| var projection = d3.geoConicConformal() | |
| .parallels([40, 43]) | |
| .rotate([100, 0]); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| d3.json("ne-district-id-topo.json", function(error, ne) { | |
| if (error) throw error; | |
| var featureCollection = topojson.feature(ne, ne.objects.districts); | |
| projection.fitSize([960,580],featureCollection); | |
| svg.append("g") | |
| .attr("class", "districts") | |
| .selectAll("path") | |
| .data(featureCollection.features) | |
| .enter().append("path") | |
| .attr("d", path); | |
| svg.append("path") | |
| .attr("class", "district-borders") | |
| .attr("d", path(topojson.mesh(ne, ne.objects.districts, function(a, b) { return a !== b; }))); | |
| }); | |
| function round(value, precision) { | |
| var multiplier = Math.pow(10, precision || 0); | |
| return Math.round(value * multiplier) / multiplier; | |
| } | |
| </script> |
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