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#  Filename : thickness_fof_depth_discontinuity.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Assigns to strokes a thickness that depends on the depth discontinuity

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

Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
shaders_list = [
    SamplingShader(1),
    ConstantThicknessShader(3),
    ConstantColorShader(0.0, 0.0, 0.0),
    pyDepthDiscontinuityThicknessShader(0.8, 6),
    ]
Operators.create(TrueUP1D(), shaders_list)