Mercurial Hosting > traffic-intelligence
view python/moving.py @ 26:54d9cb0c902b
generalized intervals
author | Nicolas Saunier <nico@confins.net> |
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date | Sat, 05 Dec 2009 12:31:28 -0500 |
parents | 28e546861263 |
children | 44689029a86f |
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#! /usr/bin/env python '''Libraries for moving objects, trajectories...''' import utils; from math import sqrt, hypot; from shapely.geometry import Polygon __metaclass__ = type #class MovingObject: class Interval: '''Generic Interval''' def __init__(self, first=0, last=-1, revert = False): 'Warning, do not revert if last<first, it contradicts the definition of empty' if revert and last<first: self.first=last self.last=first else: self.first=first self.last=last def __str__(self): return '%d %d'%(self.first, self.last) def __iter__(self): self.iterInstantNum = 0 return self def next(self): if self.iterInstantNum >= self.length(): raise StopIteration else: self.iterInstantNum += 1 return self.first+self.iterInstantNum def empty(self): ''' >>> Interval().empty() True >>> Interval(0,1).empty() False ''' return self.first > self.last def length(self): '''Returns the length of the interval >>> Interval(0,1).length() 1 >>> Interval(23.2,24.9).length() 1.6999999999999993 >>> Interval(10,8).length() 0 ''' return max(0,self.last-self.first) def getList(self): return [self.first, self.last] def contains(self, instant): return (self.first<=instant and self.last>=instant) def inside(self, interval2): 'indicates if the temporal interval of self is comprised in interval2' return (self.first >= interval2.first) and (self.last <= interval2.last) def union(self, interval2): '''Largest interval comprising self and interval2''' return TimeInterval(min(self.first, interval2.first), max(self.last, interval2.last)) def intersection(self, interval2): '''Largest interval comprising self and interval2''' return TimeInterval(max(self.first, interval2.first), min(self.last, interval2.last)) def TimeInterval(Interval): '''Temporal interval''' def __init__(self, first=0, last=-1): Interval.__init__(self, first, last, False) def length(self): '''Returns the length of the interval >>> TimeInterval(0,1).length() 2 >>> TimeInterval(10,8).length() 0 ''' return max(0,self.last-self.first+1) # class BoundingPolygon: # '''Class for a polygon bounding a set of points # with methods to create intersection, unions... # ''' # We will use the polygon class of Shapely class STObject: '''Class for spatio-temporal object i.e. with temporal and spatial existence (time interval and bounding polygon for positions (e.g. rectangle)). It does not mean that the object is defined for all time instants within the time interval''' def __init__(self, num = None, timeInterval = None, boundingPolygon = None): self.num = num self.timeInterval = timeInterval self.boundingPolygon = boundingPolygon def empty(self): return self.timeInterval.empty() or not self.boudingPolygon def getFirstInstant(self): return self.timeInterval.first() def getLastInstant(self): return self.timeInterval.first() class Point: def __init__(self, x, y): self.x = x self.y = y def __str__(self): return '(%f,%f)'%(self.x,self.y) def __repr__(self): return str(self) def __sub__(self, other): ''' >>> Point(3,4)-Point(1,7) (2.000000,-3.000000) ''' return Point(self.x-other.x, self.y-other.y) class Trajectory: '''Class for trajectories i.e. a temporal sequence of positions the class is iterable.''' def __init__(self, line1, line2): self.positions = [[float(n) for n in line1.split(' ')], [float(n) for n in line2.split(' ')]] def __str__(self): return ' '.join(map(utils.printPoint, self.positions[0], self.positions[1])) def __getitem__(self, i): return Point(self.positions[0][i], self.positions[1][i]) def __iter__(self): self.iterInstantNum = 0 return self def next(self): if self.iterInstantNum >= self.length(): raise StopIteration else: self.iterInstantNum += 1 return self[self.iterInstantNum-1] def addPosition(self, p): if not self.positions: self.positions = [[p.x],[p.y]] else: self.positions[0].append(p.x) self.positions[1].append(p.y) def draw(self, options = ''): from matplotlib.pylab import plot plot(self.positions[0], self.positions[1], options) def length(self): return len(self.positions[0]) def getXCoordinates(self): return self.positions[0] def getYCoordinates(self): return self.positions[1] def xBounds(self): # look for function that does min and max in one pass return [min(self.getXCoordinates()), max(self.getXCoordinates())] def yBounds(self): # look for function that does min and max in one pass return [min(self.getYCoordinates()), max(self.getYCoordinates())] def norm(self): '''Returns the list of the norms at each instant''' # def add(x, y): return x+y # sq = map(add, [x*x for x in self.positions[0]], [y*y for y in self.positions[1]]) # return sqrt(sq) return [hypot(x,y) for x,y in zip(self.positions[0], self.positions[1])] def getTrajectoryInPolygon(self, polygon): 'Returns the set of points inside the polygon' # use shapely polygon contains pass class MovingObject(STObject): '''Class for moving objects i.e. with a trajectory and a geometry (volume) and a type (e.g. road user) ''' def __init__(self, num = None, timeInterval = None, positions = None, geometry = None, type = None): STObject.__init__(self, num, timeInterval) self.positions = positions self.geometry = geometry self.type = type # compute bounding polygon from trajectory def length(self): return self.timeInterval.length() def getXCoordinates(self): return self.positions.getXCoordinates() def getYCoordinates(self): return self.positions.getYCoordinates() def draw(self, options = ''): self.positions.draw(options) def getInstantPassingLane(self, p1, p2): '''Returns the instant(s) the object passes from one side of the segment to the other empty list if not''' instants = [] lane = [[p1[0],p2[0]], [p1[1],p2[1]]] # refaire tout en points, marche pas # self.positions[i] self.positions[i+1] for i in xrange(self.length()-1): p = utils.segmentIntersection([self.positions[0][i:i+1],self.positions[1][i:i+1]], lane) if p: # interpolate the instant if self.positions[0][i] != self.positions[0][i+1]: ratio = (p[0]-self.positions[0][i])/(self.positions[0][i+1]-self.positions[0][i]) elif self.positions[1][i] != self.positions[1][i+1]: ratio = (p[1]-self.positions[1][i])/(self.positions[1][i+1]-self.positions[1][i]) else: ratio = 0 instants.append(self.timeInterval[i]*(1-ratio)+ratio*self.timeInterval[i+1]) return instants # def computeVelocities(self): # need for a class representing the indicators, their units, how to print them in graphs... class TemporalIndicator: '''Class for temporal indicators i.e. indicators that take a value at specific instants''' pass if __name__ == "__main__": import doctest import unittest #suite = doctest.DocFileSuite('tests/ubc_utils.txt') suite = doctest.DocTestSuite() unittest.TextTestRunner().run(suite) #doctest.testmod() #doctest.testfile("example.txt")