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#  Filename : apriori_and_causal_density.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Selects the lines with high a priori density and 
#             subjects them to the causal density so as to avoid 
#             cluttering

from freestyle import ChainPredicateIterator, ConstantColorShader, ConstantThicknessShader, IntegrationType, \
    Operators, QuantitativeInvisibilityUP1D, TrueBP1D
from PredicatesU1D import pyDensityUP1D, pyHighViewMapDensityUP1D
from logical_operators import AndUP1D, NotUP1D

upred = AndUP1D(QuantitativeInvisibilityUP1D(0), pyHighViewMapDensityUP1D(0.3, IntegrationType.LAST))
Operators.select(upred)
bpred = TrueBP1D()
Operators.bidirectional_chain(ChainPredicateIterator(upred, bpred), NotUP1D(QuantitativeInvisibilityUP1D(0)))
shaders_list = [
    ConstantThicknessShader(2),
    ConstantColorShader(0, 0, 0, 1),
    ]
Operators.create(pyDensityUP1D(1, 0.1, IntegrationType.MEAN), shaders_list)
