2009-09-19 22:02:15 +00:00
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#
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# Filename : curvature2d.py
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# Author : Stephane Grabli
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# Date : 04/08/2005
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# Purpose : The stroke points are colored in gray levels and depending
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# on the 2d curvature value
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#
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#############################################################################
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#
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# Copyright (C) : Please refer to the COPYRIGHT file distributed
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# with this source distribution.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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#############################################################################
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from freestyle_init import *
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from logical_operators import *
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from PredicatesB1D import *
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from shaders import *
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class py2DCurvatureColorShader(StrokeShader):
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def getName(self):
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return "py2DCurvatureColorShader"
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def shade(self, stroke):
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it = stroke.strokeVerticesBegin()
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it_end = stroke.strokeVerticesEnd()
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func = Curvature2DAngleF0D()
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while it.isEnd() == 0:
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it0D = it.castToInterface0DIterator()
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sv = it.getObject()
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att = sv.attribute()
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c = func(it0D)
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if (c<0):
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2009-09-27 00:58:38 +00:00
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print("negative 2D curvature")
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2009-09-19 22:02:15 +00:00
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color = 10.0 * c/3.1415
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att.setColor(color,color,color);
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it.increment()
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Operators.select(QuantitativeInvisibilityUP1D(0))
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Operators.bidirectionalChain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
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shaders_list = [
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StrokeTextureShader("smoothAlpha.bmp", Stroke.OPAQUE_MEDIUM, 0),
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ConstantThicknessShader(5),
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py2DCurvatureColorShader()
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]
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Operators.create(TrueUP1D(), shaders_list)
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