118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
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// Copyright (c) 2003-2006 INRIA Sophia-Antipolis (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Mesh_2/include/CGAL/Delaunay_mesh_criteria_2.h $
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// $Id: Delaunay_mesh_criteria_2.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Laurent RINEAU
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#ifndef CGAL_DELAUNAY_MESH_CRITERIA_2_H
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#define CGAL_DELAUNAY_MESH_CRITERIA_2_H
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#include <CGAL/license/Mesh_2.h>
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#include <CGAL/disable_warnings.h>
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#include <CGAL/Mesh_2/Face_badness.h>
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#include <CGAL/number_utils.h>
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namespace CGAL {
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template <class Tr>
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class Delaunay_mesh_criteria_2
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{
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double B;
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protected:
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typedef typename Tr::Geom_traits Geom_traits;
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Geom_traits traits;
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public:
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typedef typename Tr::Face_handle Face_handle;
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Delaunay_mesh_criteria_2(const double bound = 0.125,
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const Geom_traits& traits = Geom_traits())
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: B(bound), traits(traits) {}
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typedef double Quality;
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inline
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double bound() const { return B; }
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inline
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void set_bound(const double bound) { B = bound; }
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class Is_bad
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{
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protected:
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const double B;
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const Geom_traits& traits;
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public:
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typedef typename Tr::Point Point_2;
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Is_bad(const double bound, const Geom_traits& traits)
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: B(bound), traits(traits) {}
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Mesh_2::Face_badness operator()(const Quality q) const
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{
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if( q < B )
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return Mesh_2::BAD;
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else
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return Mesh_2::NOT_BAD;
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}
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Mesh_2::Face_badness operator()(const Face_handle& fh,
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Quality& q) const
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{
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// return the *squared* sinus of the smallest angle of the triangle
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typedef typename Tr::Geom_traits Geom_traits;
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typedef typename Geom_traits::Compute_area_2 Compute_area_2;
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typedef typename Geom_traits::Compute_squared_distance_2
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Compute_squared_distance_2;
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Compute_area_2 area_2 =
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traits.compute_area_2_object();
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Compute_squared_distance_2 squared_distance =
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traits.compute_squared_distance_2_object();
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const Point_2& pa = fh->vertex(0)->point();
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const Point_2& pb = fh->vertex(1)->point();
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const Point_2& pc = fh->vertex(2)->point();
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double area = 2*CGAL::to_double(area_2(pa, pb, pc));
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area=area*area; // area = 4 * area^2(triangle)
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double a = CGAL::to_double(squared_distance(pb, pc));
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double b = CGAL::to_double(squared_distance(pc, pa));
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double c = CGAL::to_double(squared_distance(pa, pb));
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if(a<b)
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if(a<c)
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q = area/(b*c);
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else
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q = area/(a*b);
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else
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if(b<c)
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q = area/(a*c);
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else
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q = area/(a*b);
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return operator()(q);
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}
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};
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Is_bad is_bad_object() const
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{ return Is_bad(B, traits); }
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};
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} // end namespace CGAL
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#include <CGAL/enable_warnings.h>
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#endif
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