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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.chainingiterators import ChainSilhouetteIterator
from freestyle.predicates import (
    NotUP1D,
    QuantitativeInvisibilityUP1D,
    TrueUP1D,
    )
from freestyle.shaders import (
    ConstantColorShader,
    ConstantThicknessShader,
    SamplingShader,
    )
from freestyle.types import Operators


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)