add nested geometry example

synw · Oct 14, 2020 · b87633b · b87633b
1 parent c3d4a47
commit b87633b
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diff --git a/example/dart/functions.dart b/example/dart/functions.dart
@@ -1,4 +1,5 @@
 import 'dart:io';
+
 import 'package:geojson/geojson.dart';
 
 // data is from http://www.naturalearthdata.com
@@ -7,6 +8,7 @@ void main() async {
   await multipolygons();
   await lines();
   await smallData();
+  await nestedGeometryCollection();
 }
 
 Future<void> smallData() async {
@@ -47,3 +49,15 @@ Future<void> lines() async {
         "${feature.geometry.geoSerie.geoPoints.length} geopoints");
   }
 }
+
+Future<void> nestedGeometryCollection() async {
+  final file = File("../data/nested_geometry_collection.geojson");
+  final features = await featuresFromGeoJsonFile(file, nameProperty: "name");
+  for (final feature in features.collection) {
+    final dynamic geometry = feature.geometry;
+
+    if (geometry is GeoJsonGeometryCollection) {
+      print("${geometry.name}: " + "${geometry.geometries.length} collections");
+    }
+  }
+}
diff --git a/example/data/nested_geometry_collection.geojson b/example/data/nested_geometry_collection.geojson
@@ -0,0 +1,59 @@
+{
+    "type": "FeatureCollection",
+    "features": [
+        {
+            "type": "Feature",
+            "properties": {
+                "name": "collection"
+            },
+            "geometry": {
+                "type": "GeometryCollection",
+                "geometries": [
+                    {
+                        "type": "GeometryCollection",
+                        "geometries": [
+                            {
+                                "type": "Point",
+                                "coordinates": [
+                                    0,
+                                    0
+                                ]
+                            },
+                            {
+                                "type": "GeometryCollection",
+                                "geometries": [
+                                    {
+                                        "type": "GeometryCollection",
+                                        "geometries": [
+                                            {
+                                                "type": "Point",
+                                                "coordinates": [
+                                                    0,
+                                                    0
+                                                ]
+                                            }
+                                        ]
+                                    },
+                                    {
+                                        "type": "Point",
+                                        "coordinates": [
+                                            1,
+                                            1
+                                        ]
+                                    }
+                                ]
+                            }
+                        ]
+                    },
+                    {
+                        "type": "Point",
+                        "coordinates": [
+                            1,
+                            1
+                        ]
+                    }
+                ]
+            }
+        }
+    ]
+}