From d0233600d5b364b768fd19c0f5ce85d9383e2003 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Tue, 17 Jul 2012 22:38:55 +0200
Subject: [PATCH] Add ol.TileGrid.getTileBoundsExtent

---
 src/ol/tilegrid.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/ol/tilegrid.js b/src/ol/tilegrid.js
index 189d4b9c0a..a0b7b88987 100644
--- a/src/ol/tilegrid.js
+++ b/src/ol/tilegrid.js
@@ -195,6 +195,23 @@ ol.TileGrid.prototype.getTileCoordCenter = function(tileCoord) {
 };
 
 
+/**
+ * @param {number} z Z.
+ * @param {ol.TileBounds} tileBounds Tile bounds.
+ * @return {ol.Extent} Extent.
+ */
+ol.TileGrid.prototype.getTileBoundsExtent = function(z, tileBounds) {
+  var origin = this.getOrigin(z);
+  var resolution = this.getResolution(z);
+  var tileSize = this.tileSize_;
+  var minX = origin.x + tileBounds.minX * tileSize.width * resolution;
+  var minY = origin.y + tileBounds.minY * tileSize.height * resolution;
+  var maxX = origin.x + (tileBounds.maxX + 1) * tileSize.width * resolution;
+  var maxY = origin.y + (tileBounds.maxY + 1) * tileSize.height * resolution;
+  return new ol.Extent(minX, minY, maxX, maxY);
+};
+
+
 /**
  * @param {ol.TileCoord} tileCoord Tile coordinate.
  * @return {ol.Extent} Extent.