initial rod app

lib/services/location_polygon_service.dart

@@ -0,0 +1,32 @@
+import 'package:geojson/geojson.dart';
+import 'package:http/http.dart' as http;
+
+class LocationPolygonervice{
+
+   static Future<GeoJsonFeature?> loadLocationLines() async {
+    final geo = GeoJson();
+    GeoJsonFeature? fs;
+
+    String url = 'http://localhost:8100/api/location_polygon/';
+    final response = await http.get(Uri.parse(url),
+      headers: <String, String>{
+        'Content-Type': 'application/json; charset=UTF-8',
+      },
+    );
+
+    if (response.statusCode == 200) {
+
+      geo.processedFeatures.listen((fst) {
+        fs = fst;
+      });
+
+      await geo.parse(response.body, verbose:true);
+
+      return fs;
+
+    } else {
+      throw Exception('Failed to create album.');
+    }
+  }
+
+}