repo/traffic-intelligence: python/moving.py comparison

added functionalities to indicator maps

author	Nicolas Saunier <nicolas.saunier@polymtl.ca>
date	Sat, 23 Jul 2011 02:18:16 -0400
parents	680d4c82886d
children	ad21db62b785

comparison

equal deleted inserted replaced

-:680d4c82886d
+:550556378466
 indicatorMap[(i,j)] = [indicatorValues[k]]
 for k in indicatorMap.keys():
 indicatorMap[k] = mean(indicatorMap[k])
 return indicatorMap
+def indicatorMapFromPolygon(value, polygon, squareSize):
+'''Fills an indicator map with the value within the polygon
+(array of Nx2 coordinates of the polygon vertices)'''
+import matplotlib.nxutils as nx
+from numpy.core.multiarray import array, arange
+from numpy import floor
+points = []
+for x in arange(min(polygon[:,0])+squareSize/2, max(polygon[:,0]), squareSize):
+for y in arange(min(polygon[:,1])+squareSize/2, max(polygon[:,1]), squareSize):
+points.append([x,y])
+inside = nx.points_inside_poly(array(points), polygon)
+indicatorMap = {}
+for i in xrange(len(inside)):
+if inside[i]:
+indicatorMap[(floor(points[i][0]/squareSize), floor(points[i][1]/squareSize))] = 0
+return indicatorMap
+def indicatorMapFromAxis(value, limits, squareSize):
+'''axis = [xmin, xmax, ymin, ymax] '''
+from numpy.core.multiarray import arange
+from numpy import floor
+indicatorMap = {}
+for x in arange(limits[0], limits[1], squareSize):
+for y in arange(limits[2], limits[3], squareSize):
+indicatorMap[(floor(x/squareSize), floor(y/squareSize))] = value
+return indicatorMap
 def combineIndicatorMaps(maps, squareSize, combinationFunction):
 '''Puts many indicator maps together
 (averaging the values in each cell
 if more than one maps has a value)'''
 #from numpy import mean

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