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#  Filename : external_contour_smooth.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Draws a smooth external contour

from freestyle import ChainPredicateIterator, ExternalContourUP1D, IncreasingColorShader, \
    IncreasingThicknessShader, Operators, QuantitativeInvisibilityUP1D, SamplingShader, \
    SmoothingShader, TrueBP1D, TrueUP1D
from logical_operators import AndUP1D, NotUP1D

upred = AndUP1D(QuantitativeInvisibilityUP1D(0), ExternalContourUP1D())
Operators.select(upred)
bpred = TrueBP1D()
Operators.bidirectional_chain(ChainPredicateIterator(upred, bpred), NotUP1D(upred))
shaders_list = [
    SamplingShader(2),
    IncreasingThicknessShader(4,20),
    IncreasingColorShader(1.0, 0.0, 0.5,1, 0.5,1, 0.3, 1),
    SmoothingShader(100, 0.05, 0, 0.2, 0, 0, 0, 1),
    ]
Operators.create(TrueUP1D(), shaders_list)