Added normalizeScale and getResolutionFromScale to Util.js.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1160 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -6,9 +6,6 @@
 */
 OpenLayers.Util = new Object();
 
-
-
-
 /**
 * @class This class represents a screen coordinate, in x and y coordinates
 */
@@ -1130,3 +1127,18 @@ OpenLayers.INCHES_PER_UNIT = { // borrowed from MapServer mapscale.c
 
 /** sensible default */
 OpenLayers.DOTS_PER_INCH = 72;
+
+OpenLayers.Util.normalizeScale = function (scale) {
+    if (scale > 1.0)
+        return 1.0 / scale;
+    else
+        return scale;
+};
+
+OpenLayers.Util.getResolutionFromScale = function (scale, units) {
+    if (!units) units = "degrees";
+    scale = OpenLayers.Util.normalizeScale(scale);
+    return 1 / (scale * OpenLayers.INCHES_PER_UNIT[units]
+                      * OpenLayers.DOTS_PER_INCH);
+};
+