gunu_raise_degree.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 GUNU_RAISE_DEGREE_H
00021 #define GUNU_RAISE_DEGREE_H
00022 
00023 namespace gunu {
00024 
00025 using gul::Ptr;
00026 
00027 /*-------------------------------------------------------------------------*//**
00028   raise the degree 'p' of a curve to 'p+t'. this function doesn't reserves
00029   memory for Uh and Q, in the worst case for Q: p + (n-p+1)*(t+1), and for
00030   Uh: 2*p + (n-p+2)*(t+1) elements are needed, the function returns the new 
00031   number of controlpoints - 1                                                 */
00032 /*----------------------------------------------------------------------------*/
00033 template< class T, class HP >
00034 int ElevateCurveDegree( int n, int p, Ptr<T>& U, Ptr<HP>& Pw, int t,
00035                         Ptr<T>& Uh, Ptr<HP>& Qw );
00036 
00037 
00038 /*-------------------------------------------------------------------------*//**
00039   raise the degree 'pu' or 'pv' of a surface by 't'. this function doesn't
00040   reserves memory for Uh,Vh and Qw, they must be dimensioned in u or v 
00041   direction like for curves.                                                  */
00042 /*----------------------------------------------------------------------------*/
00043 template< class T, class HP >
00044 void ElevateSurfaceDegreeU( 
00045          int nu, int pu, const Ptr<T>& U, int nv, int pv, const Ptr<T>& V,
00046          const Ptr< Ptr<HP> >& Pw, int t,
00047          int *nhu, Ptr<T>& Uh, int *nhv, Ptr<T>& Vh,
00048          Ptr< Ptr<HP> >& Qw );
00049 
00050 template< class T, class HP >
00051 void ElevateSurfaceDegreeV( 
00052          int nu, int pu, const Ptr<T>& U, int nv, int pv, const Ptr<T>& V,
00053          const Ptr< Ptr<HP> >& Pw, int t,
00054          int *nhu, Ptr<T>& Uh, int *nhv, Ptr<T>& Vh,
00055          Ptr< Ptr<HP> >& Qw );
00056 
00057 template< class T, class HP >
00058 void ElevateSurfaceDegree( 
00059                  int nu, int pu, Ptr<T>& U, int nv, int pv, Ptr<T>& V,
00060                  Ptr< Ptr<HP> >& Pw, int t, int dir,
00061                  int *nhu, Ptr<T>& Uh, int *nhv, Ptr<T>& Vh,
00062                  Ptr< Ptr<HP> >& Qw )
00063 {
00064   if( dir == gul::u_direction )
00065     ElevateSurfaceDegreeU( nu,pu,U,nv,pv,V,Pw,t,nhu,Uh,nhv,Vh,Qw );
00066   else
00067     ElevateSurfaceDegreeV( nu,pu,U,nv,pv,V,Pw,t,nhu,Uh,nhv,Vh,Qw );
00068 }
00069 
00070 
00071 
00072 }
00073 
00074 #endif
00075 
00076 
00077 
00078 
00079