guge_linear.h Source File

00001 /* LIBGUL - Geometry Utility Library
00002  * Copyright (C) 1998-1999 Norbert Irmer
00003  *
00004  * This library is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Library General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2 of the License, or (at your option) any later version.
00008  *
00009  * This library is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Library General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Library General Public
00015  * License along with this library; if not, write to the
00016  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00017  * Boston, MA 02111-1307, USA.
00018  */
00019  
00020 #ifndef GUGE_LINEAR_H
00021 #define GUGE_LINEAR_H
00022 
00023 namespace guge {
00024 
00025 using gul::Ptr;
00026 
00027 /*--------------------------------------------------------------------------
00028   check, if a curve (given by its homogeneous control points), can be 
00029   approximated with a line through its endpoints
00030 ---------------------------------------------------------------------------*/
00031 template< class T, class HP, class EP >
00032 bool IsLinear( const int n, const Ptr< HP >& Pw, 
00033                const T tol );
00034 /*-------------------------------------------------------------------------
00035   check, if a surface can be approximated with two triangles through its
00036   four corners
00037 ---------------------------------------------------------------------------*/
00038 template< class T, class HP >
00039 bool IsPlanar( const int nu, const int nv, const Ptr< Ptr< HP > >& Pw,
00040                const T tol );
00041 /*-------------------------------------------------------------------------
00042   check if a polyline forms a rectangle
00043 -------------------------------------------------------------------------*/
00044 template< class T >
00045 GULAPI bool isRectangle( int nP, const Ptr< gul::point2<T> >& P,
00046                          T& u1, T& u2, T& v1, T& v2 );
00047 
00048 }
00049 
00050 #endif