area.hpp 3.65 KB
Newer Older
Pierre Kraemer's avatar
Pierre Kraemer committed
1 2 3
/*******************************************************************************
 * CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
 * version 0.1                                                                  *
4
 * Copyright (C) 2009-2011, IGG Team, LSIIT, University of Strasbourg           *
Pierre Kraemer's avatar
Pierre Kraemer committed
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
 *                                                                              *
 * This library is free software; you can redistribute it and/or modify it      *
 * under the terms of the GNU Lesser General Public License as published by the *
 * Free Software Foundation; either version 2.1 of the License, or (at your     *
 * option) any later version.                                                   *
 *                                                                              *
 * This library 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 Lesser General Public License  *
 * for more details.                                                            *
 *                                                                              *
 * You should have received a copy of the GNU Lesser General Public License     *
 * along with this library; if not, write to the Free Software Foundation,      *
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.           *
 *                                                                              *
20
 * Web site: http://cgogn.u-strasbg.fr/                                         *
Pierre Kraemer's avatar
Pierre Kraemer committed
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70
 * Contact information: cgogn@unistra.fr                                        *
 *                                                                              *
 *******************************************************************************/

#include "Geometry/basic.h"
#include "Algo/Geometry/centroid.h"

namespace CGoGN
{

namespace Algo
{

namespace Geometry
{

template <typename PFP>
typename PFP::REAL triangleArea(typename PFP::MAP& map, Dart d, const typename PFP::TVEC3& position)
{
	typename PFP::VEC3 p1 = position[d];
	typename PFP::VEC3 p2 = position[map.phi1(d)];
	typename PFP::VEC3 p3 = position[map.phi_1(d)];

	return Geom::triangleArea(p1, p2, p3) ;
}

template <typename PFP>
typename PFP::REAL convexFaceArea(typename PFP::MAP& map, Dart d, const typename PFP::TVEC3& position)
{
	typedef typename PFP::VEC3 VEC3;

	if(map.isFaceTriangle(d))
		return triangleArea<PFP>(map, d, position) ;
	else
	{
		float area = 0.0f ;
		VEC3 centroid = Algo::Geometry::faceCentroid<PFP>(map, d, position) ;
		Dart it = d ;
		do
		{
			VEC3 p1 = position[it];
			VEC3 p2 = position[map.phi1(it)];
			area += Geom::triangleArea(p1, p2, centroid) ;
			it = map.phi1(it) ;
		} while (it != d) ;
		return area ;
	}
}

template <typename PFP>
Sylvain Thery's avatar
Sylvain Thery committed
71
typename PFP::REAL totalArea(typename PFP::MAP& map, const typename PFP::TVEC3& position, const FunctorSelect& select, unsigned int th)
Pierre Kraemer's avatar
Pierre Kraemer committed
72 73
{
	float area = 0.0f ;
Sylvain Thery's avatar
Sylvain Thery committed
74
	DartMarker mark(map,th) ;
Pierre Kraemer's avatar
Pierre Kraemer committed
75 76 77 78
	for(Dart d = map.begin(); d != map.end(); map.next(d))
	{
		if(select(d) && !mark.isMarked(d))
		{
79
			mark.markOrbit(FACE, d) ;
Pierre Kraemer's avatar
Pierre Kraemer committed
80 81 82 83 84 85 86 87 88
			area += convexFaceArea<PFP>(map, d, position) ;
		}
	}
	return area ;
}

template <typename PFP>
void computeAreaFaces(typename PFP::MAP& map, const typename PFP::TVEC3& position, typename PFP::TREAL& face_area, const FunctorSelect& select)
{
89
	CellMarker marker(map, FACE);
Pierre Kraemer's avatar
Pierre Kraemer committed
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104
	for(Dart d = map.begin(); d != map.end(); map.next(d))
	{
		if(select(d) && !marker.isMarked(d))
		{
			marker.mark(d);
			face_area[d] = convexFaceArea<PFP>(map, d, position) ;
		}
	}
}

} // namespace Geometry

} // namespace Algo

} // namespace CGoGN