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Source Code for Module fuzzy.set.Triangle

  1  # -*- coding: utf-8 -*- 
  2  # 
  3  # Copyright (C) 2009  Rene Liebscher 
  4  # 
  5  # This program is free software; you can redistribute it and/or modify it under 
  6  # the terms of the GNU Lesser General Public License as published by the Free  
  7  # Software Foundation; either version 3 of the License, or (at your option) any 
  8  # later version. 
  9  # 
 10  # This program is distributed in the hope that it will be useful, but WITHOUT  
 11  # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
 12  # FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 
 13  # details. 
 14  #  
 15  # You should have received a copy of the GNU Lesser General Public License 
 16  # along with this program; if not, see <http://www.gnu.org/licenses/>.  
 17  # 
 18   
 19  """Realize a triangle-shaped fuzzy set.""" 
 20   
 21  __revision__ = "$Id: Triangle.py,v 1.20 2010-10-29 19:24:41 rliebscher Exp $" 
 22   
 23   
 24  from fuzzy.set.Polygon import Polygon 
 25  from fuzzy.utils import prop 
 26  from fuzzy.Exception import FuzzyException 
 27   
 28 -class Triangle(Polygon): 
 29      r"""Realize a triangle-shaped fuzzy set:: 
 30                ______  y_max 
 31                A 
 32               /|\ 
 33              / | \ 
 34             /  |  \ 
 35           _/   |   \_  y_min 
 36            |   m   | 
 37            |   |   | 
 38           alpha|beta 
 39   
 40      See also U{http://pyfuzzy.sourceforge.net/demo/set/Triangle.png} 
 41      """ 
 42   
 43 -    def __init__(self, m=0.0, alpha=1.0, beta=1.0, y_max=1.0, y_min=0.0): 
 44          """ 
 45          Initialize a triangle-shaped fuzzy set. 
 46   
 47          @param y_max:  y-value at top of the triangle (1.0) 
 48          @param y_min:  y-value outside the triangle (0.0) 
 49          @param m:      x-value of top of triangle (0.0) 
 50          @param alpha:  distance of left corner to m (1.0) 
 51          @param beta:   distance of right corner to m (1.0) 
 52          """ 
 53          super(Triangle, self).__init__() 
 54          self._y_max = float(y_max) 
 55          self._y_min = float(y_min) 
 56          self._m = float(m) 
 57          self._alpha = float(alpha) 
 58          self._beta = float(beta) 
 59          self._update() # update polygon 
 60   
 61      # pylint: disable=E0211,W0212 
 62      @prop 
 63 -    def y_max(): #@NoSelf 
 64          """y-value at top of the triangle 
 65          @type: float""" 
 66          def fget(self): # pylint: disable=W0612,C0111 
 67              return self._y_max 
 68          def fset(self, value): # pylint: disable=W0612,C0111 
 69              self._y_max = float(value) 
 70              self._update() 
 71          return locals() 
 72   
 73      # pylint: disable=E0211,W0212 
 74      @prop 
 75 -    def y_min(): #@NoSelf 
 76          """y-value outside the triangle 
 77          @type: float""" 
 78          def fget(self): # pylint: disable=W0612,C0111 
 79              return self._y_min 
 80          def fset(self, value): # pylint: disable=W0612,C0111 
 81              self._y_min = float(value) 
 82              self._update() 
 83          return locals() 
 84   
 85      # pylint: disable=E0211,W0212 
 86      @prop 
 87 -    def m(): #@NoSelf 
 88          """x-value of top of triangle 
 89          @type: float""" 
 90          def fget(self): # pylint: disable=W0612,C0111 
 91              return self._m 
 92          def fset(self, value): # pylint: disable=W0612,C0111 
 93              self._m = float(value) 
 94              self._update() 
 95          return locals() 
 96   
 97      # pylint: disable=E0211,W0212 
 98      @prop 
 99 -    def alpha(): #@NoSelf 
100          """distance of left corner to m 
101          @type: float""" 
102          def fget(self): # pylint: disable=W0612,C0111 
103              return self._alpha 
104          def fset(self, value): # pylint: disable=W0612,C0111 
105              self._alpha = float(value) 
106              self._update() 
107          return locals() 
108   
109      # pylint: disable=E0211,W0212 
110      @prop 
111 -    def beta(): #@NoSelf 
112          """distance of right corner to m 
113          @type: float""" 
114          def fget(self): # pylint: disable=W0612,C0111 
115              return self._beta 
116          def fset(self, value): # pylint: disable=W0612,C0111 
117              self._beta = float(value) 
118              self._update() 
119          return locals() 
120   
121 -    def _update(self): 
122          """update polygon""" 
123          p = super(Triangle, self) 
124          p.clear() 
125          p.add(self._m-self._alpha, self._y_min) 
126          p.add(self._m, self._y_max) 
127          p.add(self._m+self._beta, self._y_min) 
128   
129 -    def add(self, x, y, where=Polygon.END): 
130          """Don't let anyone destroy our triangle.""" 
131          raise FuzzyException() 
132   
133 -    def remove(self, x, where=Polygon.END): 
134          """Don't let anyone destroy our triangle.""" 
135          raise FuzzyException() 
136   
137 -    def clear(self): 
138          """Don't let anyone destroy our triangle.""" 
139          raise FuzzyException() 
140   
141 -    def __repr__(self): 
142          """Return representation of instance. 
143                      
144             @return: representation of instance 
145             @rtype: string 
146             """ 
147          return "%s.%s(m=%s, alpha=%s, beta=%s, y_max=%s, y_min=%s)" % ( 
148                  self.__class__.__module__, 
149                  self.__class__.__name__, 
150                  self._m, 
151                  self._alpha, 
152                  self._beta, 
153                  self._y_max, 
154                  self._y_min, 
155              ) 
156   

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