Stress test for topojson.merge, new in TopoJSON 1.6.
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February 9, 2016 01:57
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Merging Counties III
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .land { | |
| fill: #eee; | |
| } | |
| .border--counties { | |
| fill: none; | |
| stroke: #fff; | |
| } | |
| .land--counties { | |
| fill-opacity: .2; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 600; | |
| var color = d3.scale.category10(); | |
| var projection = d3.geo.albersUsa() | |
| .scale(1280) | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
| if (error) throw error; | |
| svg.append("path") | |
| .datum(topojson.feature(us, us.objects.land)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| svg.append("path") | |
| .datum(topojson.mesh(us, us.objects.counties, function(a, b) { return a !== b; })) | |
| .attr("class", "border border--counties") | |
| .attr("d", path); | |
| (function transition() { | |
| var g = svg.append("g") | |
| .datum(topojson.merge(us, us.objects.counties.geometries.filter(function() { return Math.random() > .5; }))) | |
| .attr("class", "land--counties") | |
| .style("opacity", 0); | |
| g.selectAll("path") | |
| .data(function(d) { return d.coordinates; }) | |
| .enter().append("path") | |
| .datum(function(d) { return {type: "Polygon", coordinates: d}; }) | |
| .style("fill", function(d, i) { return color(i); }) | |
| .style("stroke", function(d, i) { return d3.lab(color(i)).darker(); }) | |
| .attr("d", path); | |
| g.transition() | |
| .duration(750) | |
| .style("opacity", 1) | |
| .transition() | |
| .duration(2500) | |
| .transition() | |
| .duration(750) | |
| .style("opacity", 0) | |
| .each("end", transition) | |
| .remove(); | |
| })(); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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