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# SPDX-License-Identifier: GPL-2.0-or-later
# Filename : haloing.py
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : This style module selects the lines that
# are connected (in the image) to a specific
# object and trims them in order to produce
# a haloing effect around the target shape
from freestyle.chainingiterators import ChainSilhouetteIterator
from freestyle.predicates import (
AndUP1D,
NotUP1D,
QuantitativeInvisibilityUP1D,
TrueUP1D,
pyIsOccludedByUP1D,
)
from freestyle.shaders import (
IncreasingColorShader,
IncreasingThicknessShader,
SamplingShader,
TipRemoverShader,
pyTVertexRemoverShader,
)
from freestyle.types import Id, Operators
# id corresponds to the id of the target object
# (accessed by SHIFT+click)
id = Id(3, 0)
upred = AndUP1D(QuantitativeInvisibilityUP1D(0), pyIsOccludedByUP1D(id))
Operators.select(upred)
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(upred))
shaders_list = [
IncreasingThicknessShader(3, 5),
IncreasingColorShader(1, 0, 0, 1, 0, 1, 0, 1),
SamplingShader(1.0),
pyTVertexRemoverShader(),
TipRemoverShader(3.0),
]
Operators.create(TrueUP1D(), shaders_list)
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