add: polygon to map, markers gone...

app/lib/main.dart

@@ -173,7 +173,20 @@ class _DefaultPageState extends State<DefaultPage> {
                         );
                       }).toList(),
                     ),
-
+                    PolygonLayer(
+                      polygons: [
+                        Polygon(
+                          points: [
+                            LatLng(60.7600, 10.8000),
+                            LatLng(60.7600, 11.0000),
+                            LatLng(60.7000, 11.0000),
+                            LatLng(60.7000, 10.8000),
+                          ],
+                          color: Colors.blue,
+                          isFilled: true,
+                        ),
+                      ],
+                    ),
                   ],
                 ),
               ),