Basic US map using D3 and topojson. Each state gets colored and neighbors should never be the same color. Also has some mousein/mouseout functions for highlighting the state your cursor is over
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July 15, 2018 23:49
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D3 US Map with Hover
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .states { | |
| stroke: #000; | |
| fill-opacity: .7; | |
| } | |
| .symbol { | |
| fill: steelblue; | |
| fill-opacity: .8; | |
| stroke: #fff; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script src="http://d3js.org/queue.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var radius = d3.scale.sqrt() | |
| .domain([0, 1e6]) | |
| .range([0, 10]); | |
| var path = d3.geo.path(); | |
| var color = d3.scale.category20(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| queue() | |
| .defer(d3.json, "us.json") | |
| .defer(d3.json, "us-state-centroids.json") | |
| .await(ready); | |
| function ready(error, us, centroid) { | |
| var countries = topojson.feature(us, us.objects.states).features, | |
| neighbors = topojson.neighbors(us.objects.states.geometries); | |
| svg.selectAll("states") | |
| .data(countries) | |
| .enter().insert("path", ".graticule") | |
| .attr("class", "states") | |
| .attr("d", path) | |
| .style("fill", function(d, i) { return color(d.color = d3.max(neighbors[i], function(n) { return countries[n].color; }) + 1 | 0); }) | |
| .on('mouseover', function(d, i) { | |
| var currentState = this; | |
| d3.select(this).style('fill-opacity', 1); | |
| // var thoseStates = d3 | |
| // .selectAll('path')[0] | |
| // .filter(function(state) { | |
| // return state !== currentState; | |
| // }); | |
| // d3.selectAll(thoseStates) | |
| // .style({ | |
| // 'fill-opacity':.5 | |
| // }); | |
| // }) | |
| }) | |
| .on('mouseout', function(d, i) { | |
| d3.selectAll('path') | |
| .style({ | |
| 'fill-opacity':.7 | |
| }); | |
| }); | |
| // var paths = svg.append("path") | |
| // .attr("class", "states") | |
| // .datum(topojson.feature(us, us.objects.states)) | |
| // .attr("d", path) | |
| // .style("fill", function(d, i) { return color(d.color = d3.max(neighbors[i], function(n) { return countries[n].color; }) + 1 | 0); }) | |
| // .on('mouseover', function(d, i) { | |
| // | |
| // var currentState = this; | |
| // var thoseStates = d3 | |
| // .selectAll('path')[0] | |
| // .filter(function(state) { | |
| // return state !== currentState; | |
| // }); | |
| // | |
| // d3.selectAll(thoseStates) | |
| // .transition() | |
| // .duration(300) | |
| // .style({ | |
| // 'stroke-opacity': 1, | |
| // 'stroke': '#f00' | |
| // }); | |
| // | |
| // }); | |
| // svg.selectAll(".symbol") | |
| // .data(centroid.features.sort(function(a, b) { return b.properties.population - a.properties.population; })) | |
| // .enter().append("path") | |
| // .attr("class", "symbol") | |
| // .attr("d", path.pointRadius(function(d) { return radius(d.properties.population); })); | |
| // | |
| // } | |
| } | |
| </script> |
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