From aa9f820723f696f1b8868d5f1e24884b15b77357 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <eric.lemoine@gmail.com>
Date: Tue, 29 Jan 2013 15:41:27 +0100
Subject: [PATCH] Add scale to ol.Rectangle

---
 src/ol/rectangle.js            | 13 +++++++++++++
 test/spec/ol/rectangle.test.js | 11 +++++++++++
 2 files changed, 24 insertions(+)

diff --git a/src/ol/rectangle.js b/src/ol/rectangle.js
index a459d04603..c7d9cab121 100644
--- a/src/ol/rectangle.js
+++ b/src/ol/rectangle.js
@@ -124,3 +124,16 @@ ol.Rectangle.prototype.normalize = function(coordinate) {
 ol.Rectangle.prototype.toString = function() {
   return '(' + [this.minX, this.minY, this.maxX, this.maxY].join(', ') + ')';
 };
+
+
+/**
+ * @param {number} value Value.
+ */
+ol.Rectangle.prototype.scale = function(value) {
+  var deltaX = (this.getWidth() / 2.0) * (value - 1);
+  var deltaY = (this.getHeight() / 2.0) * (value - 1);
+  this.minX -= deltaX;
+  this.minY -= deltaY;
+  this.maxX += deltaX;
+  this.maxY += deltaY;
+};
diff --git a/test/spec/ol/rectangle.test.js b/test/spec/ol/rectangle.test.js
index 55d8882e54..5f882621ca 100644
--- a/test/spec/ol/rectangle.test.js
+++ b/test/spec/ol/rectangle.test.js
@@ -98,6 +98,17 @@ describe('ol.Rectangle', function() {
     });
   });
 
+  describe('scale', function() {
+    it('scales the extent', function() {
+      var rectangle = new ol.Rectangle(1, 1, 3, 3);
+      rectangle.scale(2);
+      expect(rectangle.minX).toEqual(0);
+      expect(rectangle.minY).toEqual(0);
+      expect(rectangle.maxX).toEqual(4);
+      expect(rectangle.maxY).toEqual(4);
+    });
+  });
+
 });
 
 goog.require('ol.Coordinate');