--- a/python/moving.py	Thu Dec 04 19:07:55 2014 -0500
+++ b/python/moving.py	Wed Dec 10 14:12:06 2014 -0500
@@ -924,7 +924,8 @@
 
 class MovingObject(STObject):
     '''Class for moving objects: a spatio-temporal object 
-    with a trajectory and a geometry (constant volume over time) and a usertype (e.g. road user) coded as a number (see 
+    with a trajectory and a geometry (constant volume over time) 
+    and a usertype (e.g. road user) coded as a number (see userTypeNames)
     '''
 
     def __init__(self, num = None, timeInterval = None, positions = None, velocities = None, geometry = None, userType = userType2Num['unknown']):
@@ -1277,6 +1278,24 @@
         return Point.cosine(movingObject1.getPositionAtInstant(instant)-movingObject2.getPositionAtInstant(instant), #deltap
                             movingObject2.getVelocityAtInstant(instant)-movingObject1.getVelocityAtInstant(instant)) #deltav
 
+
+##################
+# Annotations
+##################
+
+class BBAnnotation(MovingObject):
+    '''Class for : a series of ground truth annotations using bounding boxes
+    Its center is the center of the containing shape
+    '''
+
+    def __init__(self, num = None, timeInterval = None, topPositions = None, bottomPositions = None, userType = userType2Num['unknown']):
+        super(BBAnnotation, self).__init__(num, timeInterval, Trajectory(), userType = userType)
+        self.topPositions = topPositions.getPositions()
+        self.bottomPositions = bottomPositions.getPositions()
+        for i in xrange(int(topPositions.length())):
+            self.positions.addPosition((topPositions.getPositionAt(i) + bottomPositions.getPositionAt(i)).multiply(0.5))
+        
+
 def plotRoadUsers(objects, colors):
     '''Colors is a PlottingPropertyValues instance'''
     from matplotlib.pyplot import figure, axis