Add ol.geom.MultiPolygon#getSimplifiedGeometryInternal

src/ol/geom/multipolygon.js

@@ -3,6 +3,7 @@ goog.provide('ol.geom.MultiPolygon');
 goog.require('ol.geom.Geometry');
 goog.require('ol.geom.Polygon');
 goog.require('ol.geom.flat');
+goog.require('ol.geom.simplify');
 
 
 
@@ -90,6 +91,24 @@ ol.geom.MultiPolygon.prototype.getInteriorPoints = function() {
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.geom.MultiPolygon.prototype.getSimplifiedGeometryInternal =
+    function(squaredTolerance) {
+  var simplifiedFlatCoordinates = [];
+  var simplifiedEndss = [];
+  simplifiedFlatCoordinates.length =
+      ol.geom.simplify.douglasPeuckerss(this.flatCoordinates, 0,
+          this.endss_, this.stride, squaredTolerance, simplifiedFlatCoordinates,
+          0, simplifiedEndss);
+  var simplifiedMultiPolygon = new ol.geom.MultiPolygon(null);
+  simplifiedMultiPolygon.setFlatCoordinates(
+      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates, simplifiedEndss);
+  return simplifiedMultiPolygon;
+};
+
+
 /**
  * @return {Array.<ol.geom.Polygon>} Polygons.
  */

test/spec/ol/geom/multipolygon.test.js

@@ -10,6 +10,30 @@ describe('ol.geom.MultiPolygon', function() {
     }).not.to.throwException();
   });
 
+  describe('with a simple MultiPolygon', function() {
+
+    var multiPolygon;
+    beforeEach(function() {
+      multiPolygon = new ol.geom.MultiPolygon([
+        [[[0, 0], [0, 2], [1, 1], [2, 0]]],
+        [[[3, 0], [4, 1], [5, 2], [5, 0]]]
+      ]);
+    });
+
+    describe('#getSimplifiedGeometry', function() {
+
+      it('returns the expected result', function() {
+        var simplifiedGeometry = multiPolygon.getSimplifiedGeometry(1);
+        expect(simplifiedGeometry).to.be.an(ol.geom.MultiPolygon);
+        expect(simplifiedGeometry.getCoordinates()).to.eql([
+          [[[0, 0], [0, 2], [2, 0]]],
+          [[[3, 0], [5, 2], [5, 0]]]
+        ]);
+      });
+    });
+
+  });
+
 });