Only look at the deltaY and deltaX for the lowestDelta and floor values

that are greater than or equal to 1

Author: brandonaaron

jquery.mousewheel.js

@@ -19,10 +19,11 @@
     }
 }(function ($) {
 
-    var toFix  = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'];
-    var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];
-    var slice  = Array.prototype.slice;
-    var lowestDelta, lowestDeltaXY;
+    var toFix  = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'],
+        toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
+                    ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
+        slice  = Array.prototype.slice,
+        lowestDelta;
 
     if ( $.event.fixHooks ) {
         for ( var i = toFix.length; i; ) {
@@ -69,9 +70,7 @@
             delta      = 0,
             deltaX     = 0,
             deltaY     = 0,
-            absDelta   = 0,
-            absDeltaXY = 0,
-            fn;
+            absDelta   = 0;
         event = $.event.fix(orgEvent);
         event.type = 'mousewheel';
 
@@ -103,17 +102,16 @@
         // No change actually happened, no reason to go any further
         if ( deltaY === 0 && deltaX === 0 ) { return; }
 
-        // Look for lowest delta to normalize the delta values
-        absDelta = Math.abs(delta);
-        if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }
-        absDeltaXY = Math.max(Math.abs(deltaY), Math.abs(deltaX));
-        if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }
-
-        // Get a whole value for the deltas
-        fn     = delta > 0 ? 'floor' : 'ceil';
-        delta  = Math[fn](delta  / lowestDelta);
-        deltaX = Math[fn](deltaX / lowestDeltaXY);
-        deltaY = Math[fn](deltaY / lowestDeltaXY);
+        // Store lowest absolute delta to normalize the delta values
+        absDelta = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
+        if ( !lowestDelta || absDelta < lowestDelta ) {
+          lowestDelta = absDelta;
+        }
+
+        // Get a whole, normalized value for the deltas
+        delta  = Math[ delta  >= 1 ? 'floor' : 'ceil' ](delta  / lowestDelta);
+        deltaX = Math[ deltaX >= 1 ? 'floor' : 'ceil' ](deltaX / lowestDelta);
+        deltaY = Math[ deltaY >= 1 ? 'floor' : 'ceil' ](deltaY / lowestDelta);
 
         // Add event and delta to the front of the arguments
         args.unshift(event, delta, deltaX, deltaY);