Add ol.Extent.transform

src/ol/extent.js

@@ -1,6 +1,7 @@
 goog.provide('ol.Extent');
 
 goog.require('goog.math.Box');
+goog.require('ol.TransformFunction');
 
 
 
@@ -26,3 +27,14 @@ goog.inherits(ol.Extent, goog.math.Box);
 ol.Extent.prototype.clone = function() {
   return new ol.Extent(this.top, this.right, this.bottom, this.left);
 };
+
+
+/**
+ * @param {ol.TransformFunction} transform Transform.
+ * @return {ol.Extent} Extent.
+ */
+ol.Extent.prototype.transform = function(transform) {
+  var topRight = transform(new goog.math.Coordinate(this.right, this.top));
+  var bottomLeft = transform(new goog.math.Coordinate(this.left, this.bottom));
+  return new ol.Extent(topRight.y, topRight.x, bottomLeft.y, bottomLeft.x);
+};

src/ol/extent_test.js

@@ -0,0 +1,16 @@
+goog.require('goog.testing.jsunit');
+goog.require('ol.Extent');
+goog.require('ol.Projection');
+
+
+function testTransform() {
+  var transform = ol.Projection.getTransformFromCodes('EPSG:4326', 'EPSG:3857');
+  var sourceExtent = new ol.Extent(60, 45, -30, -15);
+  var destinationExtent = sourceExtent.transform(transform);
+  assertNotNullNorUndefined(destinationExtent);
+  // FIXME check values with third-party tool
+  assertRoughlyEquals(8399737.889818361, destinationExtent.top, 1e-9);
+  assertRoughlyEquals(5009377.085697311, destinationExtent.right, 1e-9);
+  assertRoughlyEquals(-3503549.843504376, destinationExtent.bottom, 1e-9);
+  assertRoughlyEquals(-1669792.3618991037, destinationExtent.left, 1e-9);
+}