src/glu/sgi/libnurbs/internals/jarcloc.h

   1 /*
   2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice including the dates of first publication and
  13  * either this permission notice or a reference to
  14  * http://oss.sgi.com/projects/FreeB/
  15  * shall be included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  21  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  22  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Except as contained in this notice, the name of Silicon Graphics, Inc.
  26  * shall not be used in advertising or otherwise to promote the sale, use or
  27  * other dealings in this Software without prior written authorization from
  28  * Silicon Graphics, Inc.
  29  */
  30
  31 /*
  32  * jarcloc.h
  33  *
  34  */
  35
  36 #ifndef __glujarcloc_h_
  37 #define __glujarcloc_h_
  38
  39 #include "arc.h"
  40
  41 class Jarcloc {
  42 private:
  43     Arc_ptr             arc;
  44     TrimVertex          *p;
  45     TrimVertex          *plast;
  46 public:
  47     inline void         init( Arc_ptr a, long first, long last ) { arc = a; p=&a->pwlArc->pts[first]; plast = &a->pwlArc->pts[last]; }
  48     inline TrimVertex * getnextpt( void );
  49     inline TrimVertex * getprevpt( void );
  50     inline void         reverse();
  51 };
  52
  53 inline void
  54 Jarcloc::reverse()
  55 {
  56     if( plast == &arc->pwlArc->pts[0] )
  57         plast =  &arc->pwlArc->pts[arc->pwlArc->npts - 1];
  58     else
  59         plast =  &arc->pwlArc->pts[0];
  60 }
  61
  62 inline TrimVertex *
  63 Jarcloc::getnextpt()
  64 {
  65     assert( p <= plast );
  66     if( p == plast ) {
  67         arc = arc->next;
  68         p = &arc->pwlArc->pts[0];
  69         plast = &arc->pwlArc->pts[arc->pwlArc->npts - 1];
  70         assert( p < plast );
  71     }
  72     return p++;
  73 }
  74
  75 inline TrimVertex *
  76 Jarcloc::getprevpt()
  77 {
  78     assert( p >= plast );
  79     if( p == plast ) {
  80         arc = arc->prev;
  81         p = &arc->pwlArc->pts[arc->pwlArc->npts - 1];
  82         plast = &arc->pwlArc->pts[0];
  83         assert( p > plast );
  84     }
  85     return p--;
  86 }
  87 #endif /* __glujarcloc_h_ */