From b30d0c314be07e942047e972258a8901501af45d Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Sat, 14 Jul 2012 19:54:41 +0200
Subject: [PATCH] Add pixel to/from coordinate transforms

---
 src/ol/map.js | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/ol/map.js b/src/ol/map.js
index 11af7869a7..399116d78b 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -128,6 +128,23 @@ ol.Map.prototype.getCenter = function() {
 };
 
 
+/**
+ * @param {goog.math.Coordinate} pixel Pixel.
+ * @return {goog.math.Coordinate} Coordinate.
+ */
+ol.Map.prototype.getCoordinateFromPixel = function(pixel) {
+  var center = this.getCenter();
+  goog.asserts.assert(goog.isDef(center));
+  var resolution = this.getResolution();
+  goog.asserts.assert(goog.isDef(resolution));
+  var size = this.getSize();
+  goog.asserts.assert(goog.isDef(size));
+  var x = center.x + resolution * (pixel.x - size.width / 2);
+  var y = center.y - resolution * (pixel.y - size.height / 2);
+  return new goog.math.Coordinate(x, y);
+};
+
+
 /**
  * @return {ol.Extent|undefined} Extent.
  */
@@ -144,6 +161,23 @@ ol.Map.prototype.getLayers = function() {
 };
 
 
+/**
+ * @param {goog.math.Coordinate} coordinate Coordinate.
+ * @return {goog.math.Coordinate} Pixel.
+ */
+ol.Map.prototype.getPixelFromCoordinate = function(coordinate) {
+  var center = this.getCenter();
+  goog.asserts.assert(goog.isDef(center));
+  var resolution = this.getResolution();
+  goog.asserts.assert(goog.isDef(resolution));
+  var size = this.getSize();
+  goog.asserts.assert(goog.isDef(size));
+  var x = (coordinate.x - center.x) / resolution + size.width / 2;
+  var y = (center.y - coordinate.y) / resolution + size.height / 2;
+  return new goog.math.Coordinate(x, y);
+};
+
+
 /**
  * @return {ol.Projection} Projection.
  */