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comparison python/moving.py @ 245:bd8ab323c198

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corrected issue with predictPosiont static method
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Tue, 17 Jul 2012 13:25:34 -0400
parents 5027c174ab90
children 571ba5ed22e2
comparison
equal deleted inserted replaced
244:5027c174ab90 245:bd8ab323c198
189 if p1.x == p2.x or self.x <= xinters: 189 if p1.x == p2.x or self.x <= xinters:
190 counter+=1; 190 counter+=1;
191 p1=p2 191 p1=p2
192 return (counter%2 == 1); 192 return (counter%2 == 1);
193 193
194
195 @staticmethod 194 @staticmethod
196 def dot(p1, p2): 195 def dot(p1, p2):
197 'Scalar product' 196 'Scalar product'
198 return p1.x*p2.x+p1.y*p2.y 197 return p1.x*p2.x+p1.y*p2.y
199 198
209 @staticmethod 208 @staticmethod
210 def plotAll(points, color='r'): 209 def plotAll(points, color='r'):
211 from matplotlib.pyplot import scatter 210 from matplotlib.pyplot import scatter
212 scatter([p.x for p in points],[p.y for p in points], c=color) 211 scatter([p.x for p in points],[p.y for p in points], c=color)
213 212
214 @staticmethod 213
215 def predictPosition(nTimeSteps, initialPosition, initialVelocity, initialAcceleration = Point(0,0)): 214 def predictPosition(nTimeSteps, initialPosition, initialVelocity, initialAcceleration = Point(0,0)):
216 '''Predicts the position in nTimeSteps at constant speed/acceleration''' 215 '''Predicts the position in nTimeSteps at constant speed/acceleration'''
217 return initalPosition+velocity.multiply(nTimeSteps) + initialAcceleration.multiply(nTimeSteps**2) 216 return initalPosition+velocity.multiply(nTimeSteps) + initialAcceleration.multiply(nTimeSteps**2)
217
218 218
219 class FlowVector: 219 class FlowVector:
220 '''Class to represent 4-D flow vectors, 220 '''Class to represent 4-D flow vectors,
221 ie a position and a velocity''' 221 ie a position and a velocity'''
222 def __init__(self, position, velocity): 222 def __init__(self, position, velocity):
514 return [t+self.getFirstInstant() for t in indices] 514 return [t+self.getFirstInstant() for t in indices]
515 515
516 def predictPosition(self, instant, nTimeSteps, externalAcceleration = Point(0,0)): 516 def predictPosition(self, instant, nTimeSteps, externalAcceleration = Point(0,0)):
517 '''Predicts the position of object at instant+deltaT, 517 '''Predicts the position of object at instant+deltaT,
518 at constant speed''' 518 at constant speed'''
519 return Point.predictPosition(nTimeSteps, self.getPositionAtInstant(instant), self.getVelocityAtInstant(instant), externalAcceleration) 519 return predictPosition(nTimeSteps, self.getPositionAtInstant(instant), self.getVelocityAtInstant(instant), externalAcceleration)
520 520
521 @staticmethod 521 @staticmethod
522 def collisionCourseDotProduct(movingObject1, movingObject2, instant): 522 def collisionCourseDotProduct(movingObject1, movingObject2, instant):
523 'A positive result indicates that the road users are getting closer' 523 'A positive result indicates that the road users are getting closer'
524 deltap = movingObject1.getPositionAtInstant(instant)-movingObject2.getPositionAtInstant(instant) 524 deltap = movingObject1.getPositionAtInstant(instant)-movingObject2.getPositionAtInstant(instant)