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|
# PyEPL: vr/randomposition.py
#
# Copyright (C) 2003-2005 Michael J. Kahana
# Authors: Ian Schleifer, Per Sederberg, Aaron Geller, Josh Jacobs
# URL: http://memory.psych.upenn.edu/programming/pyepl
#
# Distributed under the terms of the GNU Lesser General Public License
# (LGPL). See the license.txt that came with this file.
"""
"""
import random
import numpy
import math
class RPMutableSpace:
"""
"""
def __init__(self, *shapes):
"""
"""
self.shapes = list(shapes)
def add(self, *shapes):
"""
"""
self.shapes.extend(shapes)
def remove(self, *shapes):
"""
"""
for shape in shapes:
self.shapes.remove(shape)
def getTotalWeight(self):
"""
"""
return sum(map(lambda x: x.getTotalWeight(), self.shapes))
def generatePosition(self):
"""
"""
return self.generatePositionAndSource()[0]
def generatePositionAndSource(self):
"""
"""
x = random.uniform(0.0, self.getTotalWeight())
for shape in self.shapes:
x -= shape.getTotalWeight()
if x <= 0:
return shape.generatePosition(), shape
raise ValueError, "Space has zero weight."
class RPSpace:
"""
"""
def getTotalWeight(self):
"""
"""
return 0.0
def generatePosition(self):
"""
"""
raise ValueError, "Space has zero weight."
#...
#...
class RPPoint(RPSpace):
"""
"""
def __init__(self, weight, point):
"""
"""
self.point = point
self.weight = weight
def getTotalWeight(self):
"""
"""
return self.weight
def generatePosition(self):
"""
"""
return point
#...
class RPLineSegment(RPSpace):
"""
"""
def __init__(self, density, point1, point2):
"""
"""
self.point = numpy.array(point1)
self.vector = numpy.array(point2) - self.point
self.weight = density * math.sqrt(numpy.sum(self.vector * self.vector))
def getTotalWeight(self):
"""
"""
return self.weight
def generatePosition(self):
"""
"""
return self.point + self.vector * random.random()
#...
#...
|
