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comparison python/moving.py @ 623:ce7133cbcdf3

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implemented function to concatenate objects
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Tue, 23 Dec 2014 14:56:13 -0500
parents dc8490726d06
children bac66bd536c5
comparison
equal deleted inserted replaced
622:dc8490726d06 623:ce7133cbcdf3
192 return Point(self.y, -self.x) 192 return Point(self.y, -self.x)
193 193
194 def multiply(self, alpha): 194 def multiply(self, alpha):
195 'Warning, returns a new Point' 195 'Warning, returns a new Point'
196 return Point(self.x*alpha, self.y*alpha) 196 return Point(self.x*alpha, self.y*alpha)
197
198 def divide(self, alpha):
199 'Warning, returns a new Point'
200 return Point(self.x/alpha, self.y/alpha)
197 201
198 def plot(self, options = 'o', **kwargs): 202 def plot(self, options = 'o', **kwargs):
199 from matplotlib.pylab import plot 203 from matplotlib.pylab import plot
200 plot([self.x], [self.y], options, **kwargs) 204 plot([self.x], [self.y], options, **kwargs)
201 205
946 def generate(p, v, timeInterval): 950 def generate(p, v, timeInterval):
947 positions, velocities = Trajectory.generate(p, v, int(timeInterval.length())) 951 positions, velocities = Trajectory.generate(p, v, int(timeInterval.length()))
948 return MovingObject(timeInterval = timeInterval, positions = positions, velocities = velocities) 952 return MovingObject(timeInterval = timeInterval, positions = positions, velocities = velocities)
949 953
950 @staticmethod 954 @staticmethod
951 def concatenate(obj1, obj2): 955 def concatenate(obj1, obj2, num = None):
952 ''' ''' 956 '''Concatenates two objects supposed to overlap temporally '''
953 pass 957 commonTimeInterval = obj1.commonTimeInterval(obj2)
958 if commonTimeInterval.empty():
959 print('The two objects\' time intervals do not overlap: obj1 {} and obj2 {}'.format(obj1.getTimeInterval(), obj2.getTimeInterval()))
960 return None
961 else:
962 if num == None:
963 newNum = obj1.getNum()
964 else:
965 newNum = num
966 newTimeInterval = TimeInterval.union(obj1.getTimeInterval(), obj2.getTimeInterval())
967 # positions
968 positions = Trajectory()
969 for t in newTimeInterval:
970 p = Point(0.,0.)
971 n = 0.
972 if obj1.existsAtInstant(t):
973 p += obj1.getPositionAtInstant(t)
974 n += 1.
975 if obj2.existsAtInstant(t):
976 p += obj2.getPositionAtInstant(t)
977 n += 1.
978 assert n>0, 'there should be at least one point for each instant'
979 positions.addPosition(p.divide(n))
980 # velocities: if any
981 if hasattr(obj1, 'velocities') and hasattr(obj2, 'velocities'):
982 velocities = Trajectory()
983 for t in newTimeInterval:
984 p = Point(0.,0.)
985 n = 0.
986 if obj1.existsAtInstant(t):
987 p += obj1.getVelocityAtInstant(t)
988 n += 1.
989 if obj2.existsAtInstant(t):
990 p += obj2.getVelocityAtInstant(t)
991 n += 1.
992 assert n>0, 'there should be at least one point for each instant'
993 velocities.addPosition(p.divide(n))
994 else:
995 velocities = None
996 # TODO object envelop (polygon)
997 # user type
998 if obj1.getUserType() != obj2.getUserType():
999 print('The two moving objects have different user types: obj1 {} obj2 {}'.format(userTypeNames[obj1.getUserType()], userTypeNames[obj2.getUserType()]))
1000
1001 return MovingObject(newNum, newTimeInterval, positions, velocities, userType = obj1.getUserType())
954 1002
955 def getObjectInTimeInterval(self, inter): 1003 def getObjectInTimeInterval(self, inter):
956 '''Returns a new object extracted from self, 1004 '''Returns a new object extracted from self,
957 restricted to time interval inter''' 1005 restricted to time interval inter'''
958 intersection = TimeInterval.intersection(inter, self.getTimeInterval()) 1006 intersection = TimeInterval.intersection(inter, self.getTimeInterval())