This tweak to my original example uses a Mercator projection rather than Albers USA, which straightens out many of the state borders and puts Alaska and Hawaii in their right places.
Created
February 27, 2014 21:14
Geo thumbnails (Mercator)
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>d3 geo thumbnails</title> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <style> | |
| svg.thumb { | |
| width: 90px; | |
| height: 94px; | |
| display: block; | |
| float: left; | |
| margin: 5px 0 0 5px; | |
| } | |
| path { | |
| vector-effect: non-scaling-stroke; | |
| stroke-width: 1; | |
| } | |
| .thumb .bg, | |
| .thumb use { | |
| fill: #ddd; | |
| stroke: #ccc; | |
| } | |
| .thumb .fg { | |
| fill: #8cba3d; | |
| stroke: none; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="thumbnails"></div> | |
| <svg id="shared"> | |
| </svg> | |
| <script> | |
| var root = d3.select("#thumbnails"), | |
| proj = d3.geo.mercator() | |
| .center([-98, 38]), | |
| path = d3.geo.path() | |
| .projection(proj), | |
| // how much space to give the features from | |
| // the edge of their container | |
| margin = 10; | |
| d3.json("us-states.json", function(error, topology) { | |
| var collection = topojson.feature(topology, topology.objects["states"]); | |
| // draw the whole collection once to a path in the shared <defs> | |
| d3.select("#shared") | |
| .append("defs") | |
| .append("path") | |
| .datum(collection) | |
| .attr("id", "states-bg") | |
| .attr("d", path); | |
| // sort the states by name | |
| collection.features.sort(function(a, b) { | |
| return d3.ascending(a.properties.name, b.properties.name); | |
| }); | |
| // filter out the territories & DC | |
| var states = collection.features.filter(function(d) { | |
| return +d.id <= 70 && d.id != 11; | |
| }); | |
| var svg = root.selectAll(".thumb") | |
| .data(states) | |
| .enter() | |
| .append("svg") | |
| .attr("id", function(d) { | |
| return d.properties.name; | |
| }) | |
| .attr("class", "thumb") | |
| .attr("viewBox", function(d) { | |
| // get the projected bounds | |
| var bounds = path.bounds(d), | |
| width = bounds[1][0] - bounds[0][0], | |
| height = bounds[1][1] - bounds[0][1], | |
| // get the proportion of the bounds' longest side | |
| // to the container's shortest side | |
| scale = Math.max(width, height) / Math.min(this.offsetWidth, this.offsetHeight), | |
| // and multiply the desired margin by this | |
| m = margin * scale; | |
| return [ | |
| bounds[0][0] - m, | |
| bounds[0][1] - m, | |
| width + m * 2, | |
| height + m * 2 | |
| ].join(" "); | |
| }); | |
| // place the shared states path here | |
| svg.append("use") | |
| .attr("xlink:href", "#states-bg"); | |
| // and draw the individual states on top | |
| svg.append("path") | |
| .attr("class", "fg") | |
| .attr("d", path); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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