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#  Filename : sketchy_multiple_parameterization.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Builds sketchy strokes whose topology relies on a 
#             parameterization that covers the complete lines (visible+invisible)
#             whereas only the visible portions are actually drawn

from ChainingIterators import pySketchyChainSilhouetteIterator
from freestyle import IncreasingColorShader, IncreasingThicknessShader, Operators, \
    QuantitativeInvisibilityUP1D, SamplingShader, SmoothingShader, SpatialNoiseShader, \
    TextureAssignerShader, TrueUP1D
from shaders import pyHLRShader

Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectional_chain(pySketchyChainSilhouetteIterator(3, False))
shaders_list = [
    SamplingShader(2),
    SpatialNoiseShader(15, 120, 2, True, True),
    IncreasingThicknessShader(5, 30),
    SmoothingShader(100, 0.05, 0, 0.2, 0, 0, 0, 1),
    IncreasingColorShader(0, 0.2, 0, 1, 0.2, 0.7, 0.2, 1),
    TextureAssignerShader(6),
    pyHLRShader(),
    ]
Operators.create(TrueUP1D(), shaders_list)