Add ol.geom2 utility functions

test/spec/ol/geom2/geom2.test.js

@@ -0,0 +1,71 @@
+goog.provide('ol.test.geom2');
+
+
+describe('ol.geom2', function() {
+
+  var buf, dim;
+  beforeEach(function() {
+    buf = new ol.structs.Buffer([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], 12);
+    dim = 2;
+  });
+
+  describe('ol.geom2.getExtent', function() {
+
+    it('returns the expected extent', function() {
+      var extent = ol.geom2.getExtent(buf, dim);
+      expect(extent).to.eql([0, 10, 1, 11]);
+    });
+
+    it('returns the expect extent in three dimensions', function() {
+      var extent = ol.geom2.getExtent(buf, 3);
+      expect(extent).to.eql([0, 9, 1, 10, 2, 11]);
+    });
+
+    it('returns the expect extent in four dimensions', function() {
+      var extent = ol.geom2.getExtent(buf, 4);
+      expect(extent).to.eql([0, 8, 1, 9, 2, 10, 3, 11]);
+    });
+
+    it('returns the expect extent in six dimensions', function() {
+      var extent = ol.geom2.getExtent(buf, 6);
+      expect(extent).to.eql([0, 6, 1, 7, 2, 8, 3, 9, 4, 10, 5, 11]);
+    });
+
+  });
+
+  describe('ol.geom2.packPoints', function() {
+
+    it('packs points as expected', function() {
+      var arr = [];
+      var offset = ol.geom2.packPoints(arr, 0, [[0, 1], [2, 3], [4, 5]], 2);
+      expect(offset).to.be(6);
+      expect(arr).to.eql([0, 1, 2, 3, 4, 5]);
+    });
+
+    it('raises an exception if dimensions do not match', function() {
+      expect(function() {
+        ol.geom2.packPoints([], 0, [[0, 1, 2]], 2);
+      }).to.throwException();
+    });
+
+  });
+
+  describe('ol.geom2.unpackPoints', function() {
+
+    it('unpacks points in two dimensions', function() {
+      var unpackedPoints = ol.geom2.unpackPoints([0, 1, 2, 3, 4, 5], 0, 6, 2);
+      expect(unpackedPoints).to.eql([[0, 1], [2, 3], [4, 5]]);
+    });
+
+    it('unpacks points in three dimensions', function() {
+      var unpackedPoints = ol.geom2.unpackPoints([0, 1, 2, 3, 4, 5], 0, 6, 3);
+      expect(unpackedPoints).to.eql([[0, 1, 2], [3, 4, 5]]);
+    });
+
+  });
+
+});
+
+
+goog.require('ol.geom2');
+goog.require('ol.structs.Buffer');