From 7a4672d429f1f377e858a149bc20eac98389b782 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Tue, 9 Apr 2013 15:50:54 +0200
Subject: [PATCH] Add ol.TileRange.createOrUpdate

---
 src/ol/tilerange.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/ol/tilerange.js b/src/ol/tilerange.js
index b428e07c89..bace42fe15 100644
--- a/src/ol/tilerange.js
+++ b/src/ol/tilerange.js
@@ -64,6 +64,27 @@ ol.TileRange.boundingTileRange = function(var_args) {
 };
 
 
+/**
+ * @param {number} minX Minimum X.
+ * @param {number} minY Minimum Y.
+ * @param {number} maxX Maximum X.
+ * @param {number} maxY Maximum Y.
+ * @param {ol.TileRange|undefined} tileRange TileRange.
+ * @return {ol.TileRange} Tile range.
+ */
+ol.TileRange.createOrUpdate = function(minX, minY, maxX, maxY, tileRange) {
+  if (goog.isDef(tileRange)) {
+    tileRange.minX = minX;
+    tileRange.minY = minY;
+    tileRange.maxX = maxX;
+    tileRange.maxY = maxY;
+    return tileRange;
+  } else {
+    return new ol.TileRange(minX, minY, maxX, maxY);
+  }
+};
+
+
 /**
  * @param {ol.TileCoord} tileCoord Tile coordinate.
  * @return {boolean} Contains tile coordinate.