Merge pull request #5080 from probins/geomcoll

Fix geojson write GeometryCollection

src/ol/format/geojsonformat.js

@@ -211,7 +211,9 @@ ol.format.GeoJSON.writeGeometryCollectionGeometry_ = function(
   goog.asserts.assertInstanceof(geometry, ol.geom.GeometryCollection,
       'geometry should be an ol.geom.GeometryCollection');
   var geometries = geometry.getGeometriesArray().map(function(geometry) {
-    return ol.format.GeoJSON.writeGeometry_(geometry, opt_options);
+    var options = ol.object.assign({}, opt_options);
+    delete options.featureProjection;
+    return ol.format.GeoJSON.writeGeometry_(geometry, options);
   });
   return /** @type {GeoJSONGeometryCollection} */ ({
     type: 'GeometryCollection',

test/spec/ol/format/geojsonformat.test.js

@@ -725,6 +725,28 @@ describe('ol.format.GeoJSON', function() {
           .to.be.lessThan(0.0000001);
     });
 
+    it('transforms and encodes geometry collection', function() {
+      var collection = new ol.geom.GeometryCollection([
+        new ol.geom.Point([2, 3]),
+        new ol.geom.LineString([[3, 2], [2, 1]])
+      ]);
+      var geojson = format.writeGeometry(collection, {
+        featureProjection: 'EPSG:3857'
+      });
+      var got = format.readGeometry(geojson, {
+        featureProjection: 'EPSG:3857'
+      });
+      var gotGeometries = got.getGeometries();
+      var geometries = collection.getGeometries();
+      expect(geometries[0].getCoordinates()[0]).to.roughlyEqual(
+          gotGeometries[0].getCoordinates()[0], 1e-8);
+      expect(geometries[0].getCoordinates()[1]).to.roughlyEqual(
+          gotGeometries[0].getCoordinates()[1], 1e-8);
+      expect(geometries[1].getCoordinates()[0][0]).to.roughlyEqual(
+          gotGeometries[1].getCoordinates()[0][0], 1e-8);
+      expect(geometries[1].getCoordinates()[0][1]).to.roughlyEqual(
+          gotGeometries[1].getCoordinates()[0][1], 1e-8);
+    });
   });
 
 });