An example of how to project coordinates of geodata features and then use those for d3.svg.line to take advantage of built-in line interpolators.
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| <html xmlns="http://www.w3.org/1999/xhtml"> | |
| <head> | |
| <title>Interpolating Geodata</title> | |
| <meta charset="utf-8" /> | |
| </head> | |
| <style> | |
| html,body { | |
| height: 100%; | |
| width: 100%; | |
| margin: 0; | |
| } | |
| #map { | |
| height: 100%; | |
| width: 100%; | |
| position: absolute; | |
| } | |
| svg { | |
| height: 100%; | |
| width: 100%; | |
| position: absolute; | |
| } | |
| </style> | |
| <script> | |
| function inter() { | |
| d3.json("http://bl.ocks.org/emeeks/raw/c970c9ee3e242e90004b/world.geojson", function(data) {createMap(data)}); | |
| function createMap(countries) { | |
| width = 500; | |
| height = 500; | |
| projection = d3.geo.mercator() | |
| .scale(80) | |
| .translate([width / 2, height / 2]) | |
| geoPath = d3.geo.path().projection(projection); | |
| roundedCountries = []; | |
| for (x in countries.features) { | |
| for (y in countries.features[x].geometry.coordinates) { | |
| if (countries.features[x].geometry.coordinates[y].length > 1) { | |
| roundedCountries.push(countries.features[x].geometry.coordinates[y].map(function(d) {return projection(d)})) | |
| } | |
| else { | |
| roundedCountries.push(countries.features[x].geometry.coordinates[y][0].map(function(d) {return projection(d)})) | |
| } | |
| } | |
| } | |
| d3.select("svg").append("text").attr("id", "inter").attr("x", 40).attr("y", 40) | |
| d3.select("svg").selectAll("path").data(roundedCountries) | |
| .enter() | |
| .append("path") | |
| .style("stroke-width", 1) | |
| .style("stroke", "black") | |
| .style("fill-opacity", .5) | |
| interpolateMethods = ["linear", "cardinal", "basis", "monotone", "step-before"] | |
| var l = 0; | |
| reinterpolate(); | |
| function reinterpolate() { | |
| colorScale = ["#7fc97f","#beaed4","#fdc086","#ffff99","#386cb0"]; | |
| if (l == 5) { | |
| l = 0; | |
| } | |
| countryDraw = d3.svg.line().x(function(d){ return d[0]}).y(function(d){return d[1]}).interpolate(interpolateMethods[l]) | |
| d3.select("#inter").text(interpolateMethods[l]) | |
| d3.select("svg").selectAll("path") | |
| .attr("d", countryDraw) | |
| .style("fill", colorScale[l]); | |
| setTimeout(reinterpolate,2000); | |
| l++; | |
| } | |
| } | |
| } | |
| </script> | |
| <body onload="inter()"> | |
| <div id="map"><svg></svg></div> | |
| <footer> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8" type="text/javascript"></script> | |
| <script src="http://d3js.org/d3.geo.projection.v0.min.js" type="text/javascript"> | |
| </script> | |
| </footer> | |
| </body> | |
| </html> |
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