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annotate python/moving.py @ 22:169cd4679366

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made Trajectory iterable
author Nicolas Saunier <nico@confins.net>
date Fri, 04 Dec 2009 01:01:11 -0500
parents 3c4629550f5f
children 5f2921ad4f7e
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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
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6 from math import sqrt, hypot;
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7
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8 from shapely.geometry import Polygon
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9
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10 __metaclass__ = type
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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
2
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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
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70 (time interval and bounding polygon for positions (e.g. rectangle)).
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71 It does not mean that the object is defined
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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
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90 i.e. a temporal sequence of positions
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91
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92 the class is iterable.'''
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93
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94 def __init__(self, positions = None):
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95 # self.iterInstantNum = 0
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96 self.positions = positions
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97
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98 def __str__(self):
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99 return ' '.join(map(utils.printPoint, self.positions[0], self.positions[1]))
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100
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101 def __iter__(self):
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102 self.iterInstantNum = 0
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103 return self
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104
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105 def next(self):
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106 if self.iterInstantNum >= self.length():
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107 self.iterInstantNum = 0
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108 raise StopIteration
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109 else:
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110 self.iterInstantNum += 1
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111 return self.getPosition(self.iterInstantNum-1)
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112
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113 def getPosition(self, i):
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114 return [self.positions[0][i], self.positions[1][i]]
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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
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144 def norm(self):
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145 '''Returns the list of the norms at each instant'''
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146 # def add(x, y): return x+y
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147 # sq = map(add, [x*x for x in self.positions[0]], [y*y for y in self.positions[1]])
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148 # return sqrt(sq)
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149 return [hypot(x,y) for x,y in zip(self.positions[0], self.positions[1])]
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150
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151 def getTrajectoryInPolygon(self, polygon):
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152 'Returns the set of points inside the polygon'
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153 # use shapely polygon contains
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154 pass
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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
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162 def __init__(self, num = None, timeInterval = None, positions = None, geometry = None, type = None):
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163 STObject.__init__(self, num, timeInterval)
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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()
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180
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181 def getInstantPassingLane(self, p1, p2):
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182 '''Returns the instant(s) the object passes from one side of the segment to the other
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183 None if does not'''
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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...
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189 class TemporalIndicator:
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190 '''Class for temporal indicators
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191 i.e. indicators that take a value at specific instants'''
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192 pass
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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")