Refactoring to set the constraints to the map

src/ol/interaction/mousewheelzoom.js

@@ -3,17 +3,15 @@ goog.provide('ol.interaction.MouseWheelZoom');
 goog.require('goog.events.MouseWheelEvent');
 goog.require('goog.events.MouseWheelHandler.EventType');
 goog.require('ol.MapBrowserEvent');
-goog.require('ol.interaction.Constraints');
 
 
 
 /**
  * @constructor
  * @extends {ol.interaction.Interaction}
- * @param {ol.interaction.Constraints} constraints Constraints.
  */
-ol.interaction.MouseWheelZoom = function(constraints) {
-  goog.base(this, constraints);
+ol.interaction.MouseWheelZoom = function() {
+  goog.base(this);
 };
 goog.inherits(ol.interaction.MouseWheelZoom, ol.interaction.Interaction);
 
@@ -29,13 +27,14 @@ ol.interaction.MouseWheelZoom.prototype.handleMapBrowserEvent =
     var mouseWheelEvent = /** @type {goog.events.MouseWheelEvent} */
         mapBrowserEvent.browserEvent;
     goog.asserts.assert(mouseWheelEvent instanceof goog.events.MouseWheelEvent);
-    if (mouseWheelEvent.deltaY !== 0) {
-      var delta = mouseWheelEvent.deltaY < 0 ? 1 : -1;
-      var resolution = map.getResolution();
-      var anchor = mapBrowserEvent.getCoordinate();
-      this.zoom(map, resolution, delta, anchor);
-      mapBrowserEvent.preventDefault();
-      mouseWheelEvent.preventDefault();
+    var anchor = mapBrowserEvent.getCoordinate();
+    var oldResolution = map.getResolution();
+    var factor = Math.exp(Math.log(2) / 4);
+    if (mouseWheelEvent.deltaY < 0) {
+      factor = 1 / factor;
     }
+    map.zoomToResolution(oldResolution * factor, anchor);
+    mapBrowserEvent.preventDefault();
+    mouseWheelEvent.preventDefault();
   }
 };