Base ol.Extent on ol.Rectangle instead of goog.math.Box

src/ol/extent.js

@@ -1,40 +1,29 @@
 goog.provide('ol.Extent');
 
-goog.require('goog.math.Box');
+goog.require('ol.Rectangle');
 goog.require('ol.TransformFunction');
 
 
 
 /**
  * @constructor
- * @extends {goog.math.Box}
+ * @extends {ol.Rectangle}
- * @param {number} top Top.
+ * @param {number} minX Minimum X.
- * @param {number} right Right.
+ * @param {number} minY Minimum Y.
- * @param {number} bottom Bottom.
+ * @param {number} maxX Maximum X.
- * @param {number} left Left.
+ * @param {number} maxY Maximum Y.
  */
-ol.Extent = function(top, right, bottom, left) {
+ol.Extent = function(minX, minY, maxX, maxY) {
-
+  goog.base(this, minX, minY, maxX, maxY);
-  goog.base(this, top, right, bottom, left);
-
 };
-goog.inherits(ol.Extent, goog.math.Box);
+goog.inherits(ol.Extent, ol.Rectangle);
 
 
 /**
  * @return {ol.Extent} Extent.
  */
 ol.Extent.prototype.clone = function() {
-  return new ol.Extent(this.top, this.right, this.bottom, this.left);
+  return new ol.Extent(this.minX, this.minY, this.maxX, this.maxY);
-};
-
-
-/**
- * @return {goog.math.Coordinate} Center.
- */
-ol.Extent.prototype.getCenter = function() {
-  return new goog.math.Coordinate(
-      (this.left + this.right) / 2, (this.top + this.bottom) / 2);
 };
 
 
@@ -43,7 +32,7 @@ ol.Extent.prototype.getCenter = function() {
  * @return {ol.Extent} Extent.
  */
 ol.Extent.prototype.transform = function(transform) {
-  var topRight = transform(new goog.math.Coordinate(this.right, this.top));
+  var min = transform(new goog.math.Coordinate(this.minX, this.minY));
-  var bottomLeft = transform(new goog.math.Coordinate(this.left, this.bottom));
+  var max = transform(new goog.math.Coordinate(this.maxX, this.maxY));
-  return new ol.Extent(topRight.y, topRight.x, bottomLeft.y, bottomLeft.x);
+  return new ol.Extent(min.x, min.y, max.x, max.y);
 };

src/ol/extent_test.js

@@ -1,16 +1,29 @@
+goog.require('goog.math.Coordinate');
 goog.require('goog.testing.jsunit');
 goog.require('ol.Extent');
 goog.require('ol.Projection');
 
 
+function testClone() {
+  var extent = new ol.Extent(1, 2, 3, 4);
+  var clonedExtent = extent.clone();
+  assertTrue(clonedExtent instanceof ol.Extent);
+  assertFalse(clonedExtent === extent);
+  assertEquals(extent.minX, clonedExtent.minX);
+  assertEquals(extent.minY, clonedExtent.minY);
+  assertEquals(extent.maxX, clonedExtent.maxX);
+  assertEquals(extent.maxY, clonedExtent.maxY);
+}
+
+
 function testTransform() {
   var transform = ol.Projection.getTransformFromCodes('EPSG:4326', 'EPSG:3857');
-  var sourceExtent = new ol.Extent(60, 45, -30, -15);
+  var sourceExtent = new ol.Extent(-15, -30, 45, 60);
   var destinationExtent = sourceExtent.transform(transform);
   assertNotNullNorUndefined(destinationExtent);
   // FIXME check values with third-party tool
-  assertRoughlyEquals(8399737.889818361, destinationExtent.top, 1e-9);
+  assertRoughlyEquals(-1669792.3618991037, destinationExtent.minX, 1e-9);
-  assertRoughlyEquals(5009377.085697311, destinationExtent.right, 1e-9);
+  assertRoughlyEquals(-3503549.843504376, destinationExtent.minY, 1e-9);
-  assertRoughlyEquals(-3503549.843504376, destinationExtent.bottom, 1e-9);
+  assertRoughlyEquals(5009377.085697311, destinationExtent.maxX, 1e-9);
-  assertRoughlyEquals(-1669792.3618991037, destinationExtent.left, 1e-9);
+  assertRoughlyEquals(8399737.889818361, destinationExtent.maxY, 1e-9);
 }