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# SPDX-License-Identifier: GPL-2.0-or-later
# Filename : japanese_bigbrush.py
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : Simulates a big brush fr oriental painting
from freestyle.chainingiterators import ChainSilhouetteIterator
from freestyle.functions import pyInverseCurvature2DAngleF0D
from freestyle.predicates import (
NotUP1D,
QuantitativeInvisibilityUP1D,
pyDensityUP1D,
pyHigherLengthUP1D,
pyHigherNumberOfTurnsUP1D,
pyLengthBP1D,
pyParameterUP0D,
)
from freestyle.shaders import (
BezierCurveShader,
ConstantColorShader,
ConstantThicknessShader,
SamplingShader,
TipRemoverShader,
pyNonLinearVaryingThicknessShader,
pySamplingShader,
)
from freestyle.types import IntegrationType, Operators
Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
# Splits strokes at points of highest 2D curvature
# when there are too many abrupt turns in it
func = pyInverseCurvature2DAngleF0D()
Operators.recursive_split(func, pyParameterUP0D(0.2, 0.8), NotUP1D(pyHigherNumberOfTurnsUP1D(3, 0.5)), 2)
# Keeps only long enough strokes
Operators.select(pyHigherLengthUP1D(100))
# Sorts so as to draw the longest strokes first
# (this will be done using the causal density)
Operators.sort(pyLengthBP1D())
shaders_list = [
pySamplingShader(10),
BezierCurveShader(30),
SamplingShader(50),
ConstantThicknessShader(10),
pyNonLinearVaryingThicknessShader(4, 25, 0.6),
ConstantColorShader(0.2, 0.2, 0.2, 1.0),
TipRemoverShader(10),
]
# Use the causal density to avoid cluttering
Operators.create(pyDensityUP1D(8, 0.4, IntegrationType.MEAN), shaders_list)
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