gesture recognizer: Recognizer rotation gestures.

ui/base/gestures/gesture_sequence.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_BASE_GESTURES_GESTURE_SEQUENCE_H_
 #define UI_BASE_GESTURES_GESTURE_SEQUENCE_H_
 
 #include "base/timer.h"
 #include "ui/base/events/event_constants.h"
 #include "ui/base/gestures/gesture_point.h"
@@ skipping 102 matching lines @@
   // Pinch gestures.
   void AppendPinchGestureBegin(const GesturePoint& p1,
                                const GesturePoint& p2,
                                Gestures* gestures);
   void AppendPinchGestureEnd(const GesturePoint& p1,
                              const GesturePoint& p2,
                              float scale,
                              Gestures* gestures);
   void AppendPinchGestureUpdate(const GesturePoint& point,
                                 float scale,
+                                float rotation,
                                 Gestures* gestures);
   void AppendSwipeGesture(const GesturePoint& point,
                           int swipe_x,
                           int swipe_y,
                           Gestures* gestures);
   void AppendTwoFingerTapGestureEvent(Gestures* gestures);
 
   void set_state(const GestureState state) { state_ = state; }
 
   // Various GestureTransitionFunctions for a signature.
@@ skipping 46 matching lines @@
 
   // ui::EventFlags.
   int flags_;
 
   // We maintain the smallest axis-aligned rectangle that contains all the
   // current touch-points. The 'distance' represents the diagonal distance.
   // This box is updated after every touch-event.
   gfx::Rect bounding_box_;
   gfx::Point bounding_box_last_center_;
 
+  // The angle of the diagonal of the bounding box with the X axis (in radians).
+  float bounding_box_diagonal_angle_;
+
   // For pinch, the 'distance' represents the diagonal distance of
   // |bounding_box_|.
 
   // The distance between the two points at PINCH_START.
   float pinch_distance_start_;
 
   // This distance is updated after each PINCH_UPDATE.
   float pinch_distance_current_;
 
   // This is the time when second touch down was received. Used for determining
@@ skipping 10 matching lines @@
   gfx::Point last_touch_location_;
 
   GestureEventHelper* helper_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureSequence);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_GESTURES_GESTURE_SEQUENCE_H_