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annotate python/moving.py @ 23:5f2921ad4f7e

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made Trajectory indexable and timeinterval iterable
author Nicolas Saunier <nico@confins.net>
date Fri, 04 Dec 2009 13:47:22 -0500
parents 169cd4679366
children 28e546861263
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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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11
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12 #class MovingObject:
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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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23 def __iter__(self):
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24 self.iterInstantNum = 0
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25 return self
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26
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27 def next(self):
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28 if self.iterInstantNum >= self.length():
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29 raise StopIteration
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30 else:
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31 self.iterInstantNum += 1
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32 return self.first+self.iterInstantNum
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33
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34 def empty(self):
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35 '''
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36 >>> TimeInterval().empty()
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37 True
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38 >>> TimeInterval(0,1).empty()
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39 False
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40 '''
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41 return self.first > self.last
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42
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43 def length(self):
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44 '''Returns the length of the interval
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45
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46 >>> TimeInterval(0,1).length()
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47 2
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48 >>> TimeInterval(10,8).length()
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49 0
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50 '''
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51 return max(0,self.last-self.first+1)
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52
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53 def getList(self):
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54 return [self.first, self.last]
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55
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56 def contains(self, instant):
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57 return (self.first<=instant and self.last>=instant)
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58
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59 def inside(self, interval2):
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60 'indicates if the temporal interval of self is comprised in interval2'
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61 return (self.first >= interval2.first) and (self.last <= interval2.last)
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62
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63 def union(self, interval2):
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64 '''Largest interval comprising self and interval2'''
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65 return TimeInterval(min(self.first, interval2.first), max(self.last, interval2.last))
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66
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67 def intersection(self, interval2):
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68 '''Largest interval comprising self and interval2'''
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69 return TimeInterval(max(self.first, interval2.first), min(self.last, interval2.last))
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70
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71
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72 # class BoundingPolygon:
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73 # '''Class for a polygon bounding a set of points
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74 # with methods to create intersection, unions...
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75 # '''
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76 # We will use the polygon class of Shapely
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77
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78 class STObject:
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79 '''Class for spatio-temporal object
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80 i.e. with temporal and spatial existence
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81 (time interval and bounding polygon for positions (e.g. rectangle)).
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82 It does not mean that the object is defined
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83 for all time instants within the time interval'''
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84
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85 def __init__(self, num = None, timeInterval = None, boundingPolygon = None):
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86 self.num = num
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87 self.timeInterval = timeInterval
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88 self.boundingPolygon = boundingPolygon
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89
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90 def empty(self):
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91 return self.timeInterval.empty() or not self.boudingPolygon
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92
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93 def getFirstInstant(self):
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94 return self.timeInterval.first()
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95
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96 def getLastInstant(self):
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97 return self.timeInterval.first()
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98
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99 class Trajectory:
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100 '''Class for trajectories
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101 i.e. a temporal sequence of positions
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102
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103 the class is iterable.'''
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104
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105 def __init__(self, positions = None):
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106 # self.iterInstantNum = 0
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107 self.positions = positions
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108
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109 def __str__(self):
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110 return ' '.join(map(utils.printPoint, self.positions[0], self.positions[1]))
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111
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112 def __getitem__(self, i):
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113 return [self.positions[0][i], self.positions[1][i]]
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114
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115 def __iter__(self):
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116 self.iterInstantNum = 0
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117 return self
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118
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119 def next(self):
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120 if self.iterInstantNum >= self.length():
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121 raise StopIteration
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122 else:
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123 self.iterInstantNum += 1
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124 return self[self.iterInstantNum-1]
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125
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126 def addPosition(self, point):
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127 if not self.positions:
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128 self.positions = [[point[0]],[point[1]]]
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129 else:
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130 self.positions[0].append(point[0])
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131 self.positions[1].append(point[1])
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132
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133 def draw(self):
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134 from matplotlib.pylab import plot
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135 plot(self.positions[0], self.positions[1])
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136
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137 def length(self):
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138 return len(self.positions[0])
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139
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140 def getXCoordinates(self):
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141 return self.positions[0]
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142
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143 def getYCoordinates(self):
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144 return self.positions[1]
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145
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146 def xBounds(self):
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147 # look for function that does min and max in one pass
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148 return [min(self.getXCoordinates()), max(self.getXCoordinates())]
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149
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150 def yBounds(self):
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151 # look for function that does min and max in one pass
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152 return [min(self.getYCoordinates()), max(self.getYCoordinates())]
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153
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154 def norm(self):
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155 '''Returns the list of the norms at each instant'''
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156 # def add(x, y): return x+y
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157 # sq = map(add, [x*x for x in self.positions[0]], [y*y for y in self.positions[1]])
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158 # return sqrt(sq)
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159 return [hypot(x,y) for x,y in zip(self.positions[0], self.positions[1])]
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160
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161 def getTrajectoryInPolygon(self, polygon):
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162 'Returns the set of points inside the polygon'
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163 # use shapely polygon contains
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164 pass
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165
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166 class MovingObject(STObject):
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167 '''Class for moving objects
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168 i.e. with a trajectory and a geometry (volume)
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169 and a type (e.g. road user)
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170 '''
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171
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172 def __init__(self, num = None, timeInterval = None, positions = None, geometry = None, type = None):
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173 STObject.__init__(self, num, timeInterval)
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174 self.positions = positions
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175 self.geometry = geometry
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176 self.type = type
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177 # compute bounding polygon from trajectory
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178
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179 def length(self):
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180 return self.timeInterval.length()
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181
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182 def getXCoordinates(self):
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183 return self.positions.getXCoordinates()
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184
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185 def getYCoordinates(self):
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186 return self.positions.getYCoordinates()
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187
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188 def draw(self):
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189 self.positions.draw()
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190
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191 def getInstantPassingLane(self, p1, p2):
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192 '''Returns the instant(s) the object passes from one side of the segment to the other
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193 None if does not'''
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194 # parallel
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195
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196 # def computeVelocities(self):
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197
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198 # need for a class representing the indicators, their units, how to print them in graphs...
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199 class TemporalIndicator:
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200 '''Class for temporal indicators
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201 i.e. indicators that take a value at specific instants'''
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202 pass
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203
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204 if __name__ == "__main__":
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205 import doctest
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206 import unittest
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207 #suite = doctest.DocFileSuite('tests/ubc_utils.txt')
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208 suite = doctest.DocTestSuite()
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209 unittest.TextTestRunner().run(suite)
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210 #doctest.testmod()
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211 #doctest.testfile("example.txt")