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#  Filename : curvature2d.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : The stroke points are colored in gray levels and depending
#             on the 2d curvature value

from freestyle import ChainSilhouetteIterator, ConstantThicknessShader, Operators, \
    QuantitativeInvisibilityUP1D, Stroke, StrokeTextureShader, TrueUP1D
from logical_operators import NotUP1D
from shaders import py2DCurvatureColorShader

Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
shaders_list = [
    StrokeTextureShader("smoothAlpha.bmp", Stroke.OPAQUE_MEDIUM, False),
    ConstantThicknessShader(5),
    py2DCurvatureColorShader()
    ]
Operators.create(TrueUP1D(), shaders_list)
