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#  Filename : qi1.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Draws lines hidden by one surface.
#             *** Quantitative Invisibility must have been 
#             enabled in the options dialog to use this style module ****

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

Operators.select(QuantitativeInvisibilityUP1D(1))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(1)))
shaders_list = [
    SamplingShader(5.0),
    ConstantThicknessShader(3),
    ConstantColorShader(0.5, 0.5, 0.5, 1)
    ]
Operators.create(TrueUP1D(), shaders_list)