Add ol.control.ResolutionConstraint.createContinuous

src/ol/control/resolutionconstraint.js

@@ -11,6 +11,26 @@ goog.require('ol.array');
 ol.control.ResolutionConstraintType;
 
 
+/**
+ * @param {number} power Power.
+ * @param {number} maxResolution Maximum resolution.
+ * @param {number=} opt_minResolution Minimum resolution.
+ * @return {ol.control.ResolutionConstraintType} Zoom function.
+ */
+ol.control.ResolutionConstraint.createContinuous =
+    function(power, maxResolution, opt_minResolution) {
+  var minResolution = opt_minResolution || 0;
+  return function(resolution, delta) {
+    if (goog.isDef(resolution)) {
+      resolution /= Math.pow(power, delta);
+      return goog.math.clamp(resolution, minResolution, maxResolution);
+    } else {
+      return undefined;
+    }
+  };
+};
+
+
 /**
  * @param {Array.<number>} resolutions Resolutions.
  * @return {ol.control.ResolutionConstraintType} Zoom function.