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#  Filename : near_lines.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Draws the lines that are "closer" than a threshold 
#             (between 0 and 1)

from freestyle import ChainSilhouetteIterator, ConstantColorShader, ConstantThicknessShader, \
    IntegrationType, Operators, QuantitativeInvisibilityUP1D, TextureAssignerShader, TrueUP1D
from PredicatesU1D import pyZSmallerUP1D
from logical_operators import AndUP1D, NotUP1D

upred = AndUP1D(QuantitativeInvisibilityUP1D(0), pyZSmallerUP1D(0.5, IntegrationType.MEAN))
Operators.select(upred)
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(upred))
shaders_list = [
    TextureAssignerShader(-1),
    ConstantThicknessShader(5),
    ConstantColorShader(0.0, 0.0, 0.0),
    ]
Operators.create(TrueUP1D(), shaders_list)
