text: # ##### BEGIN GPL LICENSE BLOCK #####
  #
  #  This program is free software; you can redistribute it and/or
  #  modify it under the terms of the GNU General Public License
  #  as published by the Free Software Foundation; either version 2
  #  of the License, or (at your option) any later version.
  #
  #  This program is distributed in the hope that it will be useful,
  #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #  GNU General Public License for more details.
  #
  #  You should have received a copy of the GNU General Public License
  #  along with this program; if not, write to the Free Software Foundation,
  #  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  #
  # ##### END GPL LICENSE BLOCK #####
  
  #  Filename : near_lines.py
  #  Author   : Stephane Grabli
  #  Date     : 04/08/2005
  #  Purpose  : Draws the lines that are "closer" than a threshold
  #             (between 0 and 1)
  
  from freestyle.chainingiterators import ChainSilhouetteIterator
  from freestyle.predicates import (
      AndUP1D,
      NotUP1D,
      QuantitativeInvisibilityUP1D,
      TrueUP1D,
      pyZSmallerUP1D,
  )
  from freestyle.shaders import (
      ConstantColorShader,
      ConstantThicknessShader,
  )
  from freestyle.types import IntegrationType, Operators
  
  
  upred = AndUP1D(QuantitativeInvisibilityUP1D(0), pyZSmallerUP1D(0.5, IntegrationType.MEAN))
  Operators.select(upred)
  Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(upred))
  shaders_list = [
      ConstantThicknessShader(5),
      ConstantColorShader(0.0, 0.0, 0.0),
  ]
  Operators.create(TrueUP1D(), shaders_list)
  