#
#  Filename : anisotropic_diffusion.py
#  Author   : Fredo Durand
#  Date     : 12/08/2004
#  Purpose  : Smoothes lines using an anisotropic diffusion scheme
#
#############################################################################  
#
#  Copyright (C) : Please refer to the COPYRIGHT file distributed 
#  with this source distribution. 
#
#  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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
#############################################################################

from freestyle_init import *
from logical_operators import *
from shaders import *

# pyDiffusion2Shader parameters
offset = 0.25
nbIter = 30

upred = AndUP1D(QuantitativeInvisibilityUP1D(0), ExternalContourUP1D())
Operators.select( upred )
bpred = TrueBP1D()
Operators.bidirectionalChain(ChainPredicateIterator(upred, bpred), NotUP1D(upred) )
shaders_list = [
    ConstantThicknessShader(4),
    StrokeTextureShader("smoothAlpha.bmp", Stroke.OPAQUE_MEDIUM, 0),
    SamplingShader(2),
    pyDiffusion2Shader(offset, nbIter), 
    IncreasingColorShader(1, 0, 0, 1, 0, 1, 0, 1)
    ]
Operators.create(TrueUP1D(), shaders_list)