Removed analog wheel detection and simplified code

lib/OpenLayers/Handler/MouseWheel.js

@@ -55,12 +55,6 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
      */
     cumulative: true,
     
-    /**
-     * Property: analogWheelPrecision
-     * {Integer} Adjust to get analog scroll wheel to feel right
-     */
-    analogWheelPrecision: 360,
-    
     /**
      * Constructor: OpenLayers.Handler.MouseWheel
      *
@@ -178,27 +172,15 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
                 
                 if (e.wheelDelta) {
                     delta = e.wheelDelta;
-                    
+                    if (delta % 160 === 0) {
-                    if (OpenLayers.BROWSER_NAME === "safari") {
+                        // opera have steps of 160 instead of 120
-                        // Safari has a value 10 times other browsers
+                        delta = delta * 0.75;
-                        delta = delta * 10;
-                    } else if (window.opera && window.opera.version() < 9.2) {
-                        delta = -delta;
-                    }
-                    
-                    var isAnalogScrollWheel = (delta % 40 !== 0 || Math.abs(delta) < 120);
-                    
-                    if (isAnalogScrollWheel) {
-                        delta = delta / this.analogWheelPrecision;
-                        if (OpenLayers.BROWSER_NAME === "safari") {
-                            // Undo the Safari multiplying for analog scrolling
-                            delta = delta / 10;
-                        }
-                    } else {
-                        delta = Math.round(delta / 120);
                     }
+                    delta = delta / 120;
                 } else if (e.detail) {
-                    delta = -e.detail / 3;
+                    // detail in Firefox on OS X is 1/3 of Windows
+                    // so force delta 1 / -1
+                    delta = - (e.detail / Math.abs(e.detail));
                 }
                 this.delta = this.delta + delta;