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#  Filename : invisible_lines.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Draws all lines whose Quantitative Invisibility 
#             is different from 0

from freestyle import ChainSilhouetteIterator, ConstantColorShader, ConstantThicknessShader, \
    Operators, QuantitativeInvisibilityUP1D, SamplingShader, TrueUP1D
from logical_operators import NotUP1D

upred = NotUP1D(QuantitativeInvisibilityUP1D(0))
Operators.select(upred)
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(upred))
shaders_list = [
    SamplingShader(5.0),
    ConstantThicknessShader(3.0),
    ConstantColorShader(0.7, 0.7, 0.7),
    ]
Operators.create(TrueUP1D(), shaders_list)
