Add ol.geom.MultiLineString#getLineString

src/ol/geom/multilinestring.exports

@@ -2,6 +2,7 @@
 @exportProperty ol.geom.MultiLineString.prototype.clone
 @exportProperty ol.geom.MultiLineString.prototype.getCoordinateAtM
 @exportProperty ol.geom.MultiLineString.prototype.getCoordinates
+@exportProperty ol.geom.MultiLineString.prototype.getLineString
 @exportProperty ol.geom.MultiLineString.prototype.getLineStrings
 @exportProperty ol.geom.MultiLineString.prototype.getType
 @exportProperty ol.geom.MultiLineString.prototype.setCoordinates

src/ol/geom/multilinestring.js

@@ -131,6 +131,22 @@ ol.geom.MultiLineString.prototype.getEnds = function() {
 };
 
 
+/**
+ * @param {number} index Index.
+ * @return {ol.geom.LineString} LineString.
+ */
+ol.geom.MultiLineString.prototype.getLineString = function(index) {
+  goog.asserts.assert(0 <= index && index < this.ends_.length);
+  if (index < 0 || this.ends_.length <= index) {
+    return null;
+  }
+  var lineString = new ol.geom.LineString(null);
+  lineString.setFlatCoordinates(this.layout, this.flatCoordinates.slice(
+      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]));
+  return lineString;
+};
+
+
 /**
  * @return {Array.<ol.geom.LineString>} LineStrings.
  * @todo stability experimental

test/spec/ol/geom/multilinestring.test.js

@@ -142,6 +142,17 @@ describe('ol.geom.MultiLineString', function() {
       expect(multiLineString.getStride()).to.be(3);
     });
 
+    it('can return individual line strings', function() {
+      var lineString0 = multiLineString.getLineString(0);
+      expect(lineString0).to.be.an(ol.geom.LineString);
+      expect(lineString0.getLayout()).to.be(ol.geom.GeometryLayout.XYM);
+      expect(lineString0.getCoordinates()).to.eql([[1, 2, 3], [4, 5, 6]]);
+      var lineString1 = multiLineString.getLineString(1);
+      expect(lineString1).to.be.an(ol.geom.LineString);
+      expect(lineString1.getLayout()).to.be(ol.geom.GeometryLayout.XYM);
+      expect(lineString1.getCoordinates()).to.eql([[7, 8, 9], [10, 11, 12]]);
+    });
+
     describe('#getCoordinateAtM', function() {
 
       describe('with extrapolation and interpolation', function() {