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#
# Filename : multiple_parameterization.py
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : The thickness and the color of the strokes vary continuously
# independently from occlusions although only
# visible lines are actually drawn. This is equivalent
# to assigning the thickness using a parameterization covering
# the complete silhouette (visible+invisible) and drawing
# the strokes using a second parameterization that only
# covers the visible portions.
#
#############################################################################
#
# Copyright (C) : Please refer to the COPYRIGHT file distributed
# with this source distribution.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
#############################################################################
from Freestyle import *
from logical_operators import *
from ChainingIterators import *
from shaders import *
Operators.select(QuantitativeInvisibilityUP1D(0))
## Chain following the same nature, but without the restriction
## of staying inside the selection (0).
Operators.bidirectionalChain(ChainSilhouetteIterator(0))
shaders_list = [
SamplingShader(20),
IncreasingThicknessShader(1.5, 30),
ConstantColorShader(0.0,0.0,0.0),
IncreasingColorShader(1,0,0,1,0,1,0,1),
TextureAssignerShader(-1),
pyHLRShader() ## this shader draws only visible portions
]
Operators.create(TrueUP1D(), shaders_list)
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