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comparison python/moving.py @ 79:5d487f183fe2

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added method to test points in polygons and tests
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Fri, 11 Mar 2011 18:12:29 -0500
parents d3e1a7cf3375
children 41da2cdcd91c
comparison
equal deleted inserted replaced
78:99e807c29753 79:5d487f183fe2
137 return sqrt(self.norm2Squared()) 137 return sqrt(self.norm2Squared())
138 138
139 def aslist(self): 139 def aslist(self):
140 return [self.x, self.y] 140 return [self.x, self.y]
141 141
142 def inPolygon(self, poly):
143 '''Returns if the point x, y is inside the polygon.
144 The polygon is defined by the ordered list of points in poly
145
146 taken from http://www.ariel.com.au/a/python-point-int-poly.html'''
147
148 n = len(poly);
149 counter = 0;
150
151 p1 = poly[0];
152 for i in range(n+1):
153 p2 = poly[i % n];
154 if self.y > min(p1.y,p2.y):
155 if self.y <= max(p1.y,p2.y):
156 if self.x <= max(p1.x,p2.x):
157 if p1.y != p2.y:
158 xinters = (self.y-p1.y)*(p2.x-p1.x)/(p2.y-p1.y)+p1.x;
159 if p1.x == p2.x or self.x <= xinters:
160 counter+=1;
161 p1=p2
162 return (counter%2 == 1);
163
164
142 @staticmethod 165 @staticmethod
143 def dot(p1, p2): 166 def dot(p1, p2):
144 return p1.x*p2.x+p1.y*p2.y 167 return p1.x*p2.x+p1.y*p2.y
145 168
146 @staticmethod 169 @staticmethod
156 '''Class for trajectories 179 '''Class for trajectories
157 i.e. a temporal sequence of positions 180 i.e. a temporal sequence of positions
158 181
159 the class is iterable.''' 182 the class is iterable.'''
160 183
161 def __init__(self, positions): 184 def __init__(self, positions=None):
162 self.positions = positions 185 self.positions = positions
163 186
164 @staticmethod 187 @staticmethod
165 def load(line1, line2): 188 def load(line1, line2):
166 return Trajectory([[float(n) for n in line1.split(' ')], 189 return Trajectory([[float(n) for n in line1.split(' ')],
192 else: 215 else:
193 self.positions[0].append(x) 216 self.positions[0].append(x)
194 self.positions[1].append(y) 217 self.positions[1].append(y)
195 218
196 def addPosition(self, p): 219 def addPosition(self, p):
197 self.addPosition(p.x, p.y) 220 self.addPositionXY(p.x, p.y)
198 221
199 def draw(self, options = ''): 222 def draw(self, options = ''):
200 from matplotlib.pylab import plot 223 from matplotlib.pylab import plot
201 plot(self.positions[0], self.positions[1], options) 224 plot(self.positions[0], self.positions[1], options)
202 225
256 return Trajectory([self.positions[0][inter.first:inter.last], 279 return Trajectory([self.positions[0][inter.first:inter.last],
257 self.positions[1][inter.first:inter.last]]) 280 self.positions[1][inter.first:inter.last]])
258 else: 281 else:
259 return None 282 return None
260 283
261 def getTrajectoryInPolygon(self, polygon): 284 def getTrajectoryInPolygon1(self, polygon):
262 'Returns the set of points inside the polygon' 285 'Returns the set of points inside the polygon'
263 # use shapely polygon contains 286 t = Trajectory()
264 pass 287 for i in xrange(self.length()):
288 p = self.__getitem__(i)
289 if p.inPolygon(polygon):
290 t.addPosition(p)
291 if t.length()>0:
292 return t
293 else:
294 return None
295
296 # version 2: use shapely polygon contains
265 297
266 ################## 298 ##################
267 # Moving Objects 299 # Moving Objects
268 ################## 300 ##################
269 301