/**
* Returns a hierarchical index of a cone.
*
* @param index Healpix index
* @param shape cone
* @return the pixel numbers as a hierarchical index
* @throws Exception Healpix Exception
*/
protected static HealpixMoc computeConeIndex(final HealpixIndex index, final Shape shape)
throws Exception {
final HealpixMoc moc = new HealpixMoc();
final Cone cone = (Cone) shape;
final RangeSet rangeSet =
index.queryDiscInclusive(cone.getCenter(), cone.getRadius(), TYPICAL_CHOICE_FACT);
final RangeSet.ValueIterator valueIter = rangeSet.valueIterator();
while (valueIter.hasNext()) {
final long pixNest = valueIter.next();
moc.add(new MocCell(index.getOrder(), pixNest));
}
return moc;
}
