private List createSubgraphs(PlanarGraph graph) {
List subgraphList = new ArrayList();
for (Iterator i = graph.getNodes().iterator(); i.hasNext(); ) {
Node node = (Node) i.next();
if (!node.isVisited()) {
BufferSubgraph subgraph = new BufferSubgraph();
subgraph.create(node);
subgraphList.add(subgraph);
}
}
/**
* Sort the subgraphs in descending order of their rightmost coordinate. This ensures that when
* the Polygons for the subgraphs are built, subgraphs for shells will have been built before
* the subgraphs for any holes they contain.
*/
Collections.sort(subgraphList, Collections.reverseOrder());
return subgraphList;
}
public Geobuf.Data makeFeatureCollection(Collection<GeobufFeature> featureCollection) {
Geobuf.Data.Builder data =
Geobuf.Data.newBuilder()
.setPrecision(this.precision)
// TODO don't hardwire
.setDimensions(2);
Geobuf.Data.FeatureCollection.Builder fc = Geobuf.Data.FeatureCollection.newBuilder();
// deduplicate keys
List<String> keys = new ArrayList<>();
featureCollection.stream().map(f -> this.makeFeature(f, keys)).forEach(fc::addFeatures);
fc.addAllValues(Collections.emptyList());
fc.addAllCustomProperties(Collections.emptyList());
data.setFeatureCollection(fc);
data.addAllKeys(keys);
return data.build();
}