127 lines
4.2 KiB
C++
Executable File
127 lines
4.2 KiB
C++
Executable File
// Copyright (c) 2006-2008 Fernando Luis Cacciola Carballal. All rights reserved.
|
|
//
|
|
// This file is part of CGAL (www.cgal.org).
|
|
// 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 3 of the License, or (at your option) any later version.
|
|
//
|
|
// Licensees holding a valid commercial license may use this file in
|
|
// accordance with the commercial license agreement provided with the software.
|
|
//
|
|
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
|
|
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
//
|
|
// $URL$
|
|
// $Id$
|
|
// SPDX-License-Identifier: GPL-3.0+
|
|
//
|
|
// Author(s) : Fernando Cacciola <fernando_cacciola@ciudad.com.ar>
|
|
//
|
|
#ifndef CGAL_COMPUTE_OUTER_FRAME_MARGIN_H
|
|
#define CGAL_COMPUTE_OUTER_FRAME_MARGIN_H
|
|
|
|
#include <CGAL/license/Straight_skeleton_2.h>
|
|
|
|
|
|
#include <vector>
|
|
#include <algorithm>
|
|
|
|
#include <boost/shared_ptr.hpp>
|
|
#include <boost/optional/optional.hpp>
|
|
|
|
#include <CGAL/algorithm.h>
|
|
#include <CGAL/Polygon_offset_builder_traits_2.h>
|
|
|
|
namespace CGAL {
|
|
|
|
template<class ForwardPointIterator, class Traits>
|
|
boost::optional< typename Traits::FT > compute_outer_frame_margin ( ForwardPointIterator aBegin
|
|
, ForwardPointIterator aEnd
|
|
, typename Traits::FT aOffset
|
|
, Traits const& aTraits
|
|
)
|
|
{
|
|
typedef typename Traits::Kernel Kernel ;
|
|
typedef typename Traits::FT FT ;
|
|
typedef typename Traits::Point_2 Point_2 ;
|
|
typedef typename Traits::Segment_2 Segment_2 ;
|
|
typedef typename Traits::Trisegment_2_ptr Trisegment_2_ptr ;
|
|
|
|
Kernel kernel ;
|
|
|
|
typename Kernel::Equal_2 equal = kernel.equal_2_object();
|
|
typename Kernel::Collinear_2 collinear = kernel.collinear_2_object();
|
|
typename Kernel::Compute_squared_distance_2 squared_distance = kernel.compute_squared_distance_2_object();
|
|
typename Kernel::Construct_segment_2 construct_segment = kernel.construct_segment_2_object();
|
|
|
|
typedef boost::optional<Point_2> OptionalPoint_2 ;
|
|
|
|
FT lMaxSDist(0.0) ;
|
|
|
|
ForwardPointIterator lLast = CGAL::cpp11::prev(aEnd) ;
|
|
|
|
bool lOverflow = false ;
|
|
|
|
for ( ForwardPointIterator lCurr = aBegin ; lCurr != aEnd ; ++ lCurr )
|
|
{
|
|
ForwardPointIterator lPrev = ( lCurr == aBegin ? lLast : CGAL::cpp11::prev (lCurr) ) ;
|
|
ForwardPointIterator lNext = ( lCurr == lLast ? aBegin : CGAL::cpp11::next (lCurr) ) ;
|
|
|
|
if ( !equal(*lPrev,*lCurr) && !equal(*lCurr,*lNext) && !collinear(*lPrev,*lCurr,*lNext) )
|
|
{
|
|
Segment_2 lLEdge = construct_segment(*lPrev,*lCurr);
|
|
Segment_2 lREdge = construct_segment(*lCurr,*lNext);
|
|
|
|
OptionalPoint_2 lP = Construct_offset_point_2(aTraits)(aOffset,lLEdge,lREdge, Trisegment_2_ptr() );
|
|
|
|
if ( !lP )
|
|
{
|
|
lOverflow = true ;
|
|
break ;
|
|
}
|
|
|
|
FT lSDist = squared_distance(*lCurr,*lP);
|
|
|
|
if ( ! CGAL_NTS is_valid ( lSDist )
|
|
|| ! CGAL_NTS is_finite( lSDist )
|
|
)
|
|
{
|
|
lOverflow = true ;
|
|
break ;
|
|
}
|
|
|
|
if ( lSDist > lMaxSDist )
|
|
lMaxSDist = lSDist ;
|
|
}
|
|
}
|
|
|
|
if ( ! lOverflow )
|
|
{
|
|
FT lDist = CGAL_SS_i::inexact_sqrt(lMaxSDist) ;
|
|
|
|
return boost::optional<FT>( lDist + ( aOffset * FT(1.05) ) ) ; // Add a %5 gap
|
|
}
|
|
else
|
|
return boost::optional<FT>();
|
|
|
|
}
|
|
|
|
template<class ForwardPointIterator, class FT>
|
|
boost::optional<FT> compute_outer_frame_margin ( ForwardPointIterator aBegin, ForwardPointIterator aEnd, FT aOffset )
|
|
{
|
|
typedef typename std::iterator_traits<ForwardPointIterator>::value_type Point_2 ;
|
|
|
|
typedef typename Kernel_traits<Point_2>::Kernel K;
|
|
|
|
Polygon_offset_builder_traits_2<K> traits ;
|
|
|
|
return compute_outer_frame_margin(aBegin,aEnd,aOffset,traits);
|
|
}
|
|
|
|
} // end namespace CGAL
|
|
|
|
#endif // CGAL_COMPUTE_OUTER_FRAME_MARGIN_H //
|
|
// EOF //
|
|
|
|
|