Drag the globe to rotate it, countries are re-colored based on their graphical area. Sorry, Europe, your countries are too small to see any difference.
Created
October 22, 2016 23:09
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d3.geoPath.area recoloring on drag
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| <html> | |
| <head> | |
| <style> | |
| path.graticule { | |
| fill: none; | |
| stroke-width: 1; | |
| stroke: #9A8B7A; | |
| } | |
| path.graticule.outline { | |
| fill: none; | |
| stroke: #9A8B7A; | |
| } | |
| </style> | |
| </head> | |
| <script src="https://d3js.org/d3.v4.js" type="text/JavaScript"></script> | |
| <script src="https://d3js.org/d3-geo-projection.v1.min.js"></script> | |
| <body> | |
| <div id="vizcontainer"> | |
| <svg style="width:500px;height:500px;" /> | |
| </div> | |
| <script type="text/javascript"> | |
| d3.json("world.geojson", createMap) | |
| function createMap(countries) { | |
| var projection = d3.geoOrthographic() | |
| .scale(200) | |
| .translate([250,250]) | |
| .center([0,0]) | |
| .rotate([0,0]) | |
| var geoPath = d3.geoPath().projection(projection); | |
| var featureSize = d3.extent(countries.features, function(d) { return geoPath.area(d)}) | |
| var countryColor = d3.scaleQuantize() | |
| .domain(featureSize).range(["#cdc597","#a4b77d","#72972f","#36611b","#113719"]); | |
| d3.select("svg").selectAll("path").data(countries.features) | |
| .enter() | |
| .append("path") | |
| .attr("d", geoPath) | |
| .attr("class", "countries") | |
| .style("fill", function(d) { return countryColor(geoPath.area(d))}) | |
| .style("stroke", function(d) { return d3.rgb(countryColor(geoPath.area(d))).darker()}) | |
| var graticule = d3.geoGraticule(); | |
| d3.select("svg").insert("path", "path.countries") | |
| .datum(graticule) | |
| .attr("class", "graticule line") | |
| .attr("d", geoPath) | |
| d3.select("svg").insert("path", "path.countries") | |
| .datum(graticule.outline) | |
| .attr("class", "graticule outline") | |
| .attr("d", geoPath) | |
| var mapZoom = d3.zoom() | |
| .on("zoom", zoomed) | |
| var zoomSettings = d3.zoomIdentity | |
| .translate(0, 0) | |
| .scale(200) | |
| var rotateScale = d3.scaleLinear() | |
| .domain([-500, 0, 500]) | |
| .range([-180, 0, 180]); | |
| d3.select("svg") | |
| .call(mapZoom) | |
| .call(mapZoom.transform, zoomSettings) | |
| function zoomed() { | |
| var e = d3.event | |
| var currentRotate = rotateScale(e.transform.x) % 360 | |
| projection | |
| .rotate([currentRotate, 0]) | |
| .scale(e.transform.k) | |
| d3.selectAll("path.graticule").attr("d", geoPath); | |
| d3.selectAll("path.countries").attr("d", geoPath) | |
| .style("fill", function(d) { return countryColor(geoPath.area(d))}) | |
| .style("stroke", function(d) { return d3.rgb(countryColor(geoPath.area(d))).darker()}) | |
| } | |
| } | |
| </script> | |
| </body> | |
| <footer> | |
| </html> | |
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