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# SPDX-License-Identifier: GPL-2.0-or-later
# Filename : anisotropic_diffusion.py
# Author : Fredo Durand
# Date : 12/08/2004
# Purpose : Smooth lines using an anisotropic diffusion scheme
from freestyle.chainingiterators import ChainPredicateIterator
from freestyle.predicates import (
AndUP1D,
ExternalContourUP1D,
NotUP1D,
QuantitativeInvisibilityUP1D,
TrueBP1D,
TrueUP1D,
)
from freestyle.shaders import (
ConstantThicknessShader,
IncreasingColorShader,
SamplingShader,
pyDiffusion2Shader,
)
from freestyle.types import Operators, Stroke
# pyDiffusion2Shader parameters
offset = 0.25
nbIter = 30
upred = AndUP1D(QuantitativeInvisibilityUP1D(0), ExternalContourUP1D())
Operators.select(upred)
bpred = TrueBP1D()
Operators.bidirectional_chain(ChainPredicateIterator(upred, bpred), NotUP1D(upred))
shaders_list = [
ConstantThicknessShader(4),
SamplingShader(2),
pyDiffusion2Shader(offset, nbIter),
IncreasingColorShader(1, 0, 0, 1, 0, 1, 0, 1),
]
Operators.create(TrueUP1D(), shaders_list)
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