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#  Filename : backbone_stretcher.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Stretches the geometry of visible lines

from freestyle import BackboneStretcherShader, ChainSilhouetteIterator, ConstantColorShader, \
    Operators, QuantitativeInvisibilityUP1D, TextureAssignerShader, TrueUP1D
from logical_operators import NotUP1D

Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
shaders_list = [
    TextureAssignerShader(4),
    ConstantColorShader(0.5, 0.5, 0.5),
    BackboneStretcherShader(20),
    ]
Operators.create(TrueUP1D(), shaders_list)
