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# SPDX-License-Identifier: GPL-2.0-or-later
# Filename : long_anisotropically_dense.py
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : Selects the lines that are long and have a high anisotropic
# a priori density and uses causal density
# to draw without cluttering. Ideally, half of the
# selected lines are culled using the causal density.
#
# ********************* WARNING *************************************
# ******** The Directional a priori density maps must ******
# ******** have been computed prior to using this style module ******
from freestyle.chainingiterators import ChainSilhouetteIterator
from freestyle.functions import DensityF1D
from freestyle.predicates import (
NotUP1D,
QuantitativeInvisibilityUP1D,
UnaryPredicate1D,
pyHighDensityAnisotropyUP1D,
pyHigherLengthUP1D,
pyLengthBP1D,
)
from freestyle.shaders import (
ConstantColorShader,
ConstantThicknessShader,
SamplingShader,
)
from freestyle.types import IntegrationType, Operators
# custom density predicate
class pyDensityUP1D(UnaryPredicate1D):
def __init__(self, wsize, threshold, integration=IntegrationType.MEAN, sampling=2.0):
UnaryPredicate1D.__init__(self)
self._wsize = wsize
self._threshold = threshold
self._integration = integration
self._func = DensityF1D(self._wsize, self._integration, sampling)
self._func2 = DensityF1D(self._wsize, IntegrationType.MAX, sampling)
def __call__(self, inter):
c = self._func(inter)
m = self._func2(inter)
if c < self._threshold:
return 1
if m > 4 * c:
if c < 1.5 * self._threshold:
return 1
return 0
Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
Operators.select(pyHigherLengthUP1D(40))
# selects lines having a high anisotropic a priori density
Operators.select(pyHighDensityAnisotropyUP1D(0.3, 4))
Operators.sort(pyLengthBP1D())
shaders_list = [
SamplingShader(2.0),
ConstantThicknessShader(2),
ConstantColorShader(0.2, 0.2, 0.25, 1),
]
# uniform culling
Operators.create(pyDensityUP1D(3.0, 2.0e-2, IntegrationType.MEAN, 0.1), shaders_list)
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