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# SPDX-License-Identifier: GPL-2.0-or-later
# Filename : split_at_tvertices.py
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : Draws strokes that starts and stops at Tvertices (visible or not)
from freestyle.chainingiterators import ChainSilhouetteIterator
from freestyle.predicates import (
NotUP1D,
QuantitativeInvisibilityUP1D,
TrueUP1D,
pyVertexNatureUP0D,
)
from freestyle.shaders import (
ConstantThicknessShader,
IncreasingColorShader,
)
from freestyle.types import Nature, Operators
Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
start = pyVertexNatureUP0D(Nature.T_VERTEX)
# use the same predicate to decide where to start and where to stop
# the strokes:
Operators.sequential_split(start, start, 10)
shaders_list = [
ConstantThicknessShader(5),
IncreasingColorShader(1, 0, 0, 1, 0, 1, 0, 1),
]
Operators.create(TrueUP1D(), shaders_list)
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