Allow geometries to use a shared vertex array

The ol.geom.SharedVertices structure represents a flattened array of vertex coordinates.  This is intended to support optimal WebGL rendering.

test/spec/ol/geom/geometrycollection.test.js

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+goog.provide('ol.test.geom.GeometryCollection');
+
+describe('ol.geom.GeometryCollection', function() {
+
+  var outer = [[0, 0], [10, 0], [10, 10], [0, 10], [0, 0]],
+      inner1 = [[1, 1], [2, 1], [2, 2], [1, 2], [1, 1]],
+      inner2 = [[8, 8], [9, 8], [9, 9], [8, 9], [8, 8]];
+
+  describe('constructor', function() {
+
+
+    it('creates a geometry collection from an array of geometries', function() {
+      var point = new ol.geom.Point([10, 20]);
+      var line = new ol.geom.LineString([[10, 20], [30, 40]]);
+      var poly = new ol.geom.Polygon([outer, inner1, inner2]);
+      var multi = new ol.geom.GeometryCollection([point, line, poly]);
+      expect(multi).toBeA(ol.geom.GeometryCollection);
+      expect(multi).toBeA(ol.geom.Geometry);
+    });
+
+  });
+
+  describe('#components', function() {
+
+    it('is an array of geometries', function() {
+      var point = new ol.geom.Point([10, 20]);
+      var line = new ol.geom.LineString([[10, 20], [30, 40]]);
+      var poly = new ol.geom.Polygon([outer, inner1, inner2]);
+      var multi = new ol.geom.GeometryCollection([point, line, poly]);
+
+      expect(multi.components.length).toBe(3);
+      expect(multi.components[0]).toBeA(ol.geom.Point);
+      expect(multi.components[1]).toBeA(ol.geom.LineString);
+      expect(multi.components[2]).toBeA(ol.geom.Polygon);
+    });
+
+  });
+
+  describe('#dimension', function() {
+
+    it('can be 2', function() {
+      var point = new ol.geom.Point([10, 20]);
+      var line = new ol.geom.LineString([[10, 20], [30, 40]]);
+      var poly = new ol.geom.Polygon([outer, inner1, inner2]);
+      var multi = new ol.geom.GeometryCollection([point, line, poly]);
+      expect(multi.dimension).toBe(2);
+    });
+
+    it('can be 3', function() {
+      var multi = new ol.geom.GeometryCollection([
+        new ol.geom.Point([30, 40, 50])
+      ]);
+      expect(multi.dimension).toBe(3);
+    });
+
+  });
+
+  describe('#getBounds()', function() {
+
+    it('returns the bounding extent', function() {
+      var point = new ol.geom.Point([10, 2]);
+      var line = new ol.geom.LineString([[1, 20], [30, 40]]);
+      var multi = new ol.geom.GeometryCollection([point, line]);
+      var bounds = multi.getBounds();
+      expect(bounds.minX).toBe(1);
+      expect(bounds.minY).toBe(2);
+      expect(bounds.maxX).toBe(30);
+      expect(bounds.maxY).toBe(40);
+    });
+
+  });
+
+});
+
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryCollection');
+goog.require('ol.geom.LineString');
+goog.require('ol.geom.Point');
+goog.require('ol.geom.Polygon');