add method OpenLayers.LonLat.fromArray for API-consistency. r=bartvde, p=me (closes #3443)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@12197 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/BaseTypes/LonLat.js

@@ -190,3 +190,22 @@ OpenLayers.LonLat.fromString = function(str) {
     var pair = str.split(",");
     return new OpenLayers.LonLat(pair[0], pair[1]);
 };
+
+/** 
+ * Function: fromArray
+ * Alternative constructor that builds a new <OpenLayers.LonLat> from an 
+ *     array of two numbers that represent lon- and lat-values.
+ * 
+ * Parameters:
+ * arr - {Array(Float)} Array of lon/lat values (e.g. [5,-42])
+ * 
+ * Returns:
+ * {<OpenLayers.LonLat>} New <OpenLayers.LonLat> object built from the 
+ *                       passed-in array.
+ */
+OpenLayers.LonLat.fromArray = function(arr) {
+    var gotArr = OpenLayers.Util.isArray(arr),
+        lon = gotArr && arr[0],
+        lat = gotArr && arr[1];
+    return new OpenLayers.LonLat(lon, lat);
+};