Move rotate from View2D to Interaction

src/ol/interaction/interaction.js

@@ -43,3 +43,59 @@ ol.interaction.Interaction.pan = function(
     view.setCenter([currentCenter[0] + delta[0], currentCenter[1] + delta[1]]);
   }
 };
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.View2D} view View.
+ * @param {number|undefined} rotation Rotation.
+ * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
+ * @param {number=} opt_duration Duration.
+ */
+ol.interaction.Interaction.rotate =
+    function(map, view, rotation, opt_anchor, opt_duration) {
+  rotation = view.constrainRotation(rotation, 0);
+  ol.interaction.Interaction.rotateWithoutConstraints(
+      map, view, rotation, opt_anchor, opt_duration);
+};
+
+
+/**
+ * @param {ol.Map} map Map.
+ * @param {ol.View2D} view View.
+ * @param {number|undefined} rotation Rotation.
+ * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
+ * @param {number=} opt_duration Duration.
+ */
+ol.interaction.Interaction.rotateWithoutConstraints =
+    function(map, view, rotation, opt_anchor, opt_duration) {
+  if (goog.isDefAndNotNull(rotation)) {
+    var currentRotation = view.getRotation();
+    var currentCenter = view.getCenter();
+    if (goog.isDef(currentRotation) && goog.isDef(currentCenter) &&
+        goog.isDef(opt_duration)) {
+      map.requestRenderFrame();
+      map.addPreRenderFunction(ol.animation.rotate({
+        rotation: currentRotation,
+        duration: opt_duration,
+        easing: ol.easing.easeOut
+      }));
+      if (goog.isDef(opt_anchor)) {
+        map.addPreRenderFunction(ol.animation.pan({
+          source: currentCenter,
+          duration: opt_duration,
+          easing: ol.easing.easeOut
+        }));
+      }
+    }
+    if (goog.isDefAndNotNull(opt_anchor)) {
+      var center = view.calculateCenterRotate(rotation, opt_anchor);
+      map.withFrozenRendering(function() {
+        view.setCenter(center);
+        view.setRotation(rotation);
+      });
+    } else {
+      view.setRotation(rotation);
+    }
+  }
+};