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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
#
#############################################################################
#
# 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_init import *
from logical_operators import *
from PredicatesB1D import *
from shaders import *
class py2DCurvatureColorShader(StrokeShader):
def getName(self):
return "py2DCurvatureColorShader"
def shade(self, stroke):
it = stroke.strokeVerticesBegin()
it_end = stroke.strokeVerticesEnd()
func = Curvature2DAngleF0D()
while it.isEnd() == 0:
it0D = it.castToInterface0DIterator()
sv = it.getObject()
att = sv.attribute()
c = func(it0D)
if (c<0):
print("negative 2D curvature")
color = 10.0 * c/3.1415
att.setColor(color,color,color);
it.increment()
Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectionalChain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
shaders_list = [
StrokeTextureShader("smoothAlpha.bmp", Stroke.OPAQUE_MEDIUM, 0),
ConstantThicknessShader(5),
py2DCurvatureColorShader()
]
Operators.create(TrueUP1D(), shaders_list)
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