Dancing through the 1983 State Plane zone projections in the continental US.
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July 3, 2016 04:27
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The State Plane Shuffle
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| stroke-linejoin: round; | |
| fill: none; | |
| stroke: #444; | |
| stroke-width: 1px; | |
| } | |
| text { | |
| font: 32px sans-serif; | |
| font-weight: bold; | |
| } | |
| .highlight { | |
| fill: #f0f; | |
| stroke: none; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.14/d3.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("stateplane.topo.json",function(err,stateplane){ | |
| var inner = topojson.mesh(stateplane,stateplane.objects.stateplane,function(a, b) { return a !== b; }), | |
| zones = topojson.feature(stateplane,stateplane.objects.stateplane).features; | |
| outer = topojson.merge(stateplane,stateplane.objects.stateplane.geometries); | |
| zones.forEach(function(zone){ | |
| var fn = d3.geo[zone.properties.type]().rotate(zone.properties.rotate); | |
| if (zone.properties.parallels) { | |
| fn.parallels(zone.properties.parallels); | |
| } | |
| zone.properties.path = scaledPath(fn); | |
| }); | |
| d3.shuffle(zones); | |
| svg.append("path") | |
| .attr("class","outer") | |
| .datum(outer); | |
| var highlight = svg.append("path") | |
| .attr("class","highlight") | |
| .datum(zones[0]); | |
| svg.append("path") | |
| .attr("class","inner") | |
| .datum(inner); | |
| var paths = d3.selectAll("path") | |
| .attr("d",zones[0].properties.path); | |
| var text = svg.append("text") | |
| .attr("x",0) | |
| .attr("y",height) | |
| .attr("dy","-1em") | |
| .text(zones[0].properties.name); | |
| morph(); | |
| function morph() { | |
| var current = zones[0], | |
| next = zones.pop(); | |
| zones.unshift(next); | |
| highlight.datum(next) | |
| .attr("d",current.properties.path); | |
| text.transition() | |
| .delay(100) | |
| .duration(0) | |
| .each("end",function(){ | |
| text.text(next.properties.name); | |
| }); | |
| paths.transition() | |
| .delay(100) | |
| .duration(1200) | |
| .attr("d",next.properties.path) | |
| .each("end",function(d,i){ | |
| if (i === 2) { | |
| morph(); | |
| } | |
| }); | |
| } | |
| function scaledPath(projection) { | |
| var p = d3.geo.path().projection(projection); | |
| // Auto-scale a la http://bl.ocks.org/mbostock/4707858 | |
| projection | |
| .scale(1) | |
| .translate([0, 0]); | |
| var b = p.bounds(outer), | |
| s = .95 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height), | |
| t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2]; | |
| projection | |
| .scale(s) | |
| .translate(t); | |
| return p; | |
| } | |
| }); | |
| </script> |
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