Mercurial Hosting > traffic-intelligence
annotate python/moving.py @ 22:169cd4679366
made Trajectory iterable
author | Nicolas Saunier <nico@confins.net> |
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date | Fri, 04 Dec 2009 01:01:11 -0500 |
parents | 3c4629550f5f |
children | 5f2921ad4f7e |
rev | line source |
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1 #! /usr/bin/env python |
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2 '''Libraries for moving objects, trajectories...''' |
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3 |
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4 import utils; |
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5 |
16 | 6 from math import sqrt, hypot; |
7 | |
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8 from shapely.geometry import Polygon |
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9 |
0
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10 __metaclass__ = type |
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11 |
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12 #class MovingObject: |
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13 |
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14 class TimeInterval: |
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15 '''Temporal interval''' |
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16 def __init__(self, first=0, last=-1): |
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17 self.first=first |
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18 self.last=last |
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19 |
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20 def __str__(self): |
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21 return '%d %d'%(self.first, self.last) |
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22 |
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23 def empty(self): |
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24 ''' |
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25 >>> TimeInterval().empty() |
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26 True |
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27 >>> TimeInterval(0,1).empty() |
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28 False |
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29 ''' |
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30 return self.first > self.last |
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31 |
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32 def length(self): |
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33 '''Returns the length of the interval |
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34 |
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35 >>> TimeInterval(0,1).length() |
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36 2 |
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37 >>> TimeInterval(10,8).length() |
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38 0 |
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39 ''' |
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40 return max(0,self.last-self.first+1) |
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41 |
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42 def getList(self): |
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43 return [self.first, self.last] |
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44 |
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45 def contains(self, instant): |
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46 return (self.first<=instant and self.last>=instant) |
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47 |
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48 def inside(self, interval2): |
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49 'indicates if the temporal interval of self is comprised in interval2' |
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50 return (self.first >= interval2.first) and (self.last <= interval2.last) |
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51 |
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52 def union(self, interval2): |
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53 '''Largest interval comprising self and interval2''' |
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54 return TimeInterval(min(self.first, interval2.first), max(self.last, interval2.last)) |
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55 |
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56 def intersection(self, interval2): |
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57 '''Largest interval comprising self and interval2''' |
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58 return TimeInterval(max(self.first, interval2.first), min(self.last, interval2.last)) |
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59 |
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60 |
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61 # class BoundingPolygon: |
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62 # '''Class for a polygon bounding a set of points |
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63 # with methods to create intersection, unions... |
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64 # ''' |
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65 # We will use the polygon class of Shapely |
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66 |
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67 class STObject: |
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68 '''Class for spatio-temporal object |
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69 i.e. with temporal and spatial existence |
6 | 70 (time interval and bounding polygon for positions (e.g. rectangle)). |
71 It does not mean that the object is defined | |
72 for all time instants within the time interval''' | |
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73 |
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74 def __init__(self, num = None, timeInterval = None, boundingPolygon = None): |
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75 self.num = num |
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76 self.timeInterval = timeInterval |
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77 self.boundingPolygon = boundingPolygon |
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78 |
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79 def empty(self): |
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80 return self.timeInterval.empty() or not self.boudingPolygon |
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81 |
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82 def getFirstInstant(self): |
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83 return self.timeInterval.first() |
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84 |
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85 def getLastInstant(self): |
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86 return self.timeInterval.first() |
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87 |
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88 class Trajectory: |
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89 '''Class for trajectories |
22 | 90 i.e. a temporal sequence of positions |
91 | |
92 the class is iterable.''' | |
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93 |
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94 def __init__(self, positions = None): |
22 | 95 # self.iterInstantNum = 0 |
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96 self.positions = positions |
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97 |
16 | 98 def __str__(self): |
99 return ' '.join(map(utils.printPoint, self.positions[0], self.positions[1])) | |
100 | |
22 | 101 def __iter__(self): |
102 self.iterInstantNum = 0 | |
103 return self | |
104 | |
105 def next(self): | |
106 if self.iterInstantNum >= self.length(): | |
107 self.iterInstantNum = 0 | |
108 raise StopIteration | |
109 else: | |
110 self.iterInstantNum += 1 | |
111 return self.getPosition(self.iterInstantNum-1) | |
112 | |
113 def getPosition(self, i): | |
114 return [self.positions[0][i], self.positions[1][i]] | |
115 | |
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116 def addPosition(self, point): |
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117 if not self.positions: |
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118 self.positions = [[point[0]],[point[1]]] |
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119 else: |
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120 self.positions[0].append(point[0]) |
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121 self.positions[1].append(point[1]) |
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122 |
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123 def draw(self): |
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124 from matplotlib.pylab import plot |
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125 plot(self.positions[0], self.positions[1]) |
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126 |
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127 def length(self): |
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128 return len(self.getXCoordinates()) |
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129 |
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130 def getXCoordinates(self): |
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131 return self.positions[0] |
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132 |
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133 def getYCoordinates(self): |
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134 return self.positions[1] |
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135 |
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136 def xBounds(self): |
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137 # look for function that does min and max in one pass |
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138 return [min(self.getXCoordinates()), max(self.getXCoordinates())] |
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139 |
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140 def yBounds(self): |
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141 # look for function that does min and max in one pass |
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142 return [min(self.getYCoordinates()), max(self.getYCoordinates())] |
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143 |
16 | 144 def norm(self): |
145 '''Returns the list of the norms at each instant''' | |
146 # def add(x, y): return x+y | |
147 # sq = map(add, [x*x for x in self.positions[0]], [y*y for y in self.positions[1]]) | |
148 # return sqrt(sq) | |
149 return [hypot(x,y) for x,y in zip(self.positions[0], self.positions[1])] | |
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150 |
19 | 151 def getTrajectoryInPolygon(self, polygon): |
152 'Returns the set of points inside the polygon' | |
153 # use shapely polygon contains | |
154 pass | |
155 | |
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156 class MovingObject(STObject): |
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157 '''Class for moving objects |
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158 i.e. with a trajectory and a geometry (volume) |
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159 and a type (e.g. road user) |
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160 ''' |
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161 |
16 | 162 def __init__(self, num = None, timeInterval = None, positions = None, geometry = None, type = None): |
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163 STObject.__init__(self, num, timeInterval) |
16 | 164 self.positions = positions |
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165 self.geometry = geometry |
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166 self.type = type |
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167 # compute bounding polygon from trajectory |
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168 |
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169 def length(self): |
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170 return self.timeInterval.length() |
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171 |
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172 def getXCoordinates(self): |
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173 return self.positions.getXCoordinates() |
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174 |
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175 def getYCoordinates(self): |
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176 return self.positions.getYCoordinates() |
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177 |
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178 def draw(self): |
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179 self.positions.draw() |
22 | 180 |
181 def getInstantPassingLane(self, p1, p2): | |
182 '''Returns the instant(s) the object passes from one side of the segment to the other | |
183 None if does not''' | |
184 # parallel | |
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185 |
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186 # def computeVelocities(self): |
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187 |
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188 # need for a class representing the indicators, their units, how to print them in graphs... |
6 | 189 class TemporalIndicator: |
190 '''Class for temporal indicators | |
191 i.e. indicators that take a value at specific instants''' | |
192 pass | |
193 | |
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194 if __name__ == "__main__": |
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195 import doctest |
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196 import unittest |
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197 #suite = doctest.DocFileSuite('tests/ubc_utils.txt') |
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198 suite = doctest.DocTestSuite() |
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199 unittest.TextTestRunner().run(suite) |
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200 #doctest.testmod() |
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201 #doctest.testfile("example.txt") |