+
+ public static double calculateDistance(ReadGraph graph, Resource startVertex, Resource endVertex) throws DatabaseException {
+ Layer0 L0 = Layer0.getInstance(graph);
+ Resource startComposite = graph.getSingleObject(startVertex, L0.PartOf);
+ Resource endComposite = graph.getSingleObject(endVertex, L0.PartOf);
+ if (!startComposite.equalsResource(endComposite)) {
+ throw new DatabaseException("Can not calculate distance between vertices on different composites! " + startVertex + " -> " + endVertex);
+ }
+ Resource crs = graph.getSingleObject(startComposite, DistrictNetworkResource.getInstance(graph).HasSpatialRefSystem);
+
+ CRS crsClass = graph.adapt(crs, CRS.class);
+
+ double[] startCoords = graph.getRelatedValue2(startVertex, DiagramResource.getInstance(graph).HasLocation, Bindings.DOUBLE_ARRAY);
+ double[] endCoords = graph.getRelatedValue2(endVertex, DiagramResource.getInstance(graph).HasLocation, Bindings.DOUBLE_ARRAY);
+
+ return crsClass.calculateDistance(startCoords, endCoords);
+ }