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Lucence Spatial Search 3.0.3
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| namespace LuceneExample | |
| { | |
| #region Namespaces | |
| using System; | |
| using Lucene.Net.Analysis; | |
| using Lucene.Net.Documents; | |
| using Lucene.Net.Index; | |
| using Lucene.Net.Search; | |
| using Lucene.Net.Spatial.Queries; | |
| using Lucene.Net.Spatial.Vector; | |
| using Lucene.Net.Store; | |
| using Spatial4n.Core.Context; | |
| using Spatial4n.Core.Shapes; | |
| #endregion | |
| public static class Program | |
| { | |
| private static readonly SpatialContext context = new SpatialContext(true); | |
| private static PointVectorStrategy strategy; | |
| private static void AddPoint(IndexWriter writer, string name, double lng, double lat) | |
| { | |
| Point shape = context.MakePoint(lng, lat); | |
| var doc = new Document(); | |
| foreach (var fld in strategy.CreateIndexableFields(shape)) | |
| { | |
| doc.Add(fld); | |
| } | |
| doc.Add(new Field("Name", name, Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS)); | |
| writer.AddDocument(doc); | |
| } | |
| private static void Main() | |
| { | |
| strategy = new PointVectorStrategy(context, "Location"); | |
| using (var dir = new RAMDirectory()) | |
| { | |
| using (var writer = new IndexWriter(dir, new SimpleAnalyzer(), true, IndexWriter.MaxFieldLength.UNLIMITED)) | |
| { | |
| AddPoint(writer, "London", -81.233040, 42.983390); | |
| AddPoint(writer, "East New York", -73.882360, 40.666770); | |
| AddPoint(writer, "Manhattan", -73.966250, 40.783430); | |
| AddPoint(writer, "New York City", -74.005970, 40.714270); | |
| AddPoint(writer, "Oslo", 10.746090, 59.912730); | |
| AddPoint(writer, "Bergen", 5.324150, 60.392990); | |
| AddPoint(writer, "Washington, D. C.", -77.036370, 38.895110); | |
| } | |
| // Origin point - Oslo Spektrum | |
| const double lat = 59.9138688; | |
| const double lng = 10.752245399999993; | |
| const double radius = 180; | |
| var query = strategy.MakeQuery(new SpatialArgs(SpatialOperation.IsWithin, context.MakeCircle(lng, lat, radius))); | |
| using (var searcher = new IndexSearcher(dir)) | |
| { | |
| var results = searcher.Search(query, null, 100); | |
| foreach (var topDoc in results.ScoreDocs) | |
| { | |
| var name = searcher.Doc(topDoc.Doc).Get("Name"); | |
| Console.WriteLine(name); | |
| } | |
| } | |
| } | |
| Console.ReadLine(); | |
| } | |
| } | |
| } |
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