INFRA: Set Up Project.

lib/widget/geoflutterfire/src/models/distance_doc_snapshot.dart

@@ -0,0 +1,11 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+
+class DistanceDocSnapshot<T> {
+  final DocumentSnapshot<T> documentSnapshot;
+  final double kmDistance;
+
+  DistanceDocSnapshot({
+    required this.documentSnapshot,
+    required this.kmDistance,
+  });
+}

lib/widget/geoflutterfire/src/models/point.dart

@@ -0,0 +1,60 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+
+import '../utils/math.dart';
+
+class GeoFirePoint {
+  static final MathUtils _util = MathUtils();
+  double latitude, longitude;
+
+  GeoFirePoint(this.latitude, this.longitude);
+
+  /// return geographical distance between two Co-ordinates
+  static double kmDistanceBetween({required Coordinates to, required Coordinates from}) {
+    return MathUtils.kmDistance(to, from);
+  }
+
+  /// return neighboring geo-hashes of [hash]
+  static List<String> neighborsOf({required String hash}) {
+    return _util.neighbors(hash);
+  }
+
+  /// return hash of [GeoFirePoint]
+  String get hash {
+    return _util.encode(latitude, longitude, 9);
+  }
+
+  /// return all neighbors of [GeoFirePoint]
+  List<String> get neighbors {
+    return _util.neighbors(hash);
+  }
+
+  /// return [GeoPoint] of [GeoFirePoint]
+  GeoPoint get geoPoint {
+    return GeoPoint(latitude, longitude);
+  }
+
+  Coordinates get coords {
+    return Coordinates(latitude, longitude);
+  }
+
+  /// return distance between [GeoFirePoint] and ([lat], [lng])
+  double kmDistance({required double lat, required double lng}) {
+    return kmDistanceBetween(from: coords, to: Coordinates(lat, lng));
+  }
+
+  Map<String, Object> get data {
+    return {'geopoint': geoPoint, 'geohash': hash};
+  }
+
+  /// haversine distance between [GeoFirePoint] and ([lat], [lng])
+  double haversineDistance({required double lat, required double lng}) {
+    return GeoFirePoint.kmDistanceBetween(from: coords, to: Coordinates(lat, lng));
+  }
+}
+
+class Coordinates {
+  double latitude;
+  double longitude;
+
+  Coordinates(this.latitude, this.longitude);
+}