/**
* make sure outer ring is CCW and holes are CW for all the polygons in the Geometry
*
* @param mp set of polygons to check
*/
MultiPolygon makeGoodSHAPEMultiPolygon(MultiPolygon mp) {
MultiPolygon result;
Polygon[] ps = new Polygon[mp.getNumGeometries()];
// check each sub-polygon
for (int t = 0; t < mp.getNumGeometries(); t++) {
ps[t] = makeGoodSHAPEPolygon((Polygon) mp.getGeometryN(t));
}
result = new MultiPolygon(ps, new PrecisionModel(), 0);
return result;
}
public Geobuf.Data.Geometry multiPolyToGeobuf(MultiPolygon poly) {
Geobuf.Data.Geometry.Builder builder =
Geobuf.Data.Geometry.newBuilder().setType(Geobuf.Data.Geometry.Type.MULTIPOLYGON);
// first we specify the number of polygons
builder.addLengths(poly.getNumGeometries());
for (int i = 0; i < poly.getNumGeometries(); i++) {
Polygon p = (Polygon) poly.getGeometryN(i);
// how many rings there are
builder.addLengths(p.getNumInteriorRing() + 1);
Stream<LineString> interiorRings =
IntStream.range(0, p.getNumInteriorRing()).<LineString>mapToObj(p::getInteriorRingN);
Stream.concat(Stream.of(p.getExteriorRing()), interiorRings)
.forEach(r -> addRing(r, builder));
}
return builder.build();
}