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# SPDX-License-Identifier: GPL-2.0-or-later
# Filename : qi0_not_external_contour.py
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : Draws the visible lines (chaining follows same nature lines)
# that do not belong to the external contour of the scene
from freestyle.chainingiterators import ChainSilhouetteIterator
from freestyle.predicates import (
AndUP1D,
ExternalContourUP1D,
NotUP1D,
QuantitativeInvisibilityUP1D,
TrueUP1D,
)
from freestyle.shaders import (
BackboneStretcherShader,
IncreasingColorShader,
IncreasingThicknessShader,
SamplingShader,
SpatialNoiseShader,
)
from freestyle.types import Operators
upred = AndUP1D(QuantitativeInvisibilityUP1D(0), ExternalContourUP1D())
Operators.select(upred)
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(upred))
shaders_list = [
SamplingShader(4),
SpatialNoiseShader(4, 150, 2, True, True),
IncreasingThicknessShader(2, 5),
BackboneStretcherShader(20),
IncreasingColorShader(1, 0, 0, 1, 0, 1, 0, 1),
]
Operators.create(TrueUP1D(), shaders_list)
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