topojson.merge topojson.mesh about topogram HOT 3 CLOSED

Great, i got it working.

first defining, almost exactly as you suggested
collection = {type: "FeatureCollection", features: thecarto.features};
topology = topojson.topology({collection: collection});

then drawing/coloring the regions
mapg.selectAll(".subunit2").data(thecarto.features).enter().append("path") .attr("class","subunit2") .attr("d", carto.path) .attr('fill',function(d){return getcolor(coldata[d.id]);});

then i loop over all countries, merging the regions, and drawing the country borders
// countrylist Array [ "AT", "BE", "BG", "CY", "CZ", "DE", "DK", "EE", "ES", "FI", 18 more… ]
countrylist.forEach(function(d) {
var ctr = topojson.mergeArcs(topology,topology.objects.collection.geometries.filter(function(z) {return (z.id.substring(0,2) == d);}));
mapg.append("path").datum(topojson.mesh(topology,ctr)).attr("d", carto.path).attr("class", "cartoctrborder").style("stroke", "black").style("stroke-width", bordersize_ctr).style("fill", "none");
});

thanks a bunch!

from topogram.

Yeah, I think the problem is that TopoJSON won't work with the plain old Feature objects that topogram returns. You should be able to recreate a topology with something like:

var collection = {type: 'FeatureCollection', features: features};
var topology = topojson.topology(collection);

And then you can run topojson.merge() and/or topojson.mesh() on the resulting topology. Let me know if that works!

from topogram.

No problem!

from topogram.