src/glu/sgi/libnurbs/internals/arc.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  * arc.h
  33  *
  34  * $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
  35  * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/arc.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
  36  */
  37
  38 #ifndef __gluarc_h_
  39 #define __gluarc_h_
  40
  41 #include "myassert.h"
  42 #include "bufpool.h"
  43 #include "mystdio.h"
  44 #include "types.h"
  45 #include "pwlarc.h"
  46 #include "trimvertex.h"
  47
  48 class Bin;
  49 class Arc;
  50 struct BezierArc;
  51
  52 typedef class Arc *Arc_ptr;
  53
  54 enum arc_side { arc_none = 0, arc_right, arc_top, arc_left, arc_bottom };
  55
  56
  57 class Arc: public PooledObj { /* an arc, in two list, the trim list and bin */
  58
  59 public:
  60     static const int bezier_tag;
  61     static const int arc_tag;
  62     static const int tail_tag;
  63     Arc_ptr             prev;           /* trim list pointer */
  64     Arc_ptr             next;           /* trim list pointer */
  65     Arc_ptr             link;           /* bin pointers */
  66     BezierArc *         bezierArc;      /* associated bezier arc */
  67     PwlArc *            pwlArc; /* associated pwl arc */
  68     long                type;           /* curve type */
  69     long                nuid;
  70
  71     inline              Arc( Arc *, PwlArc * );
  72     inline              Arc( arc_side, long );
  73
  74     Arc_ptr             append( Arc_ptr );
  75     int                 check( void );
  76     int                 isMonotone( void );
  77     int                 isDisconnected( void );
  78     int                 numpts( void );
  79     void                markverts( void );
  80     void                getextrema( Arc_ptr[4] );
  81     void                print( void );
  82     void                show( void );
  83     void                makeSide( PwlArc *, arc_side );
  84     inline int          isTessellated() { return pwlArc ? 1 : 0; }
  85     inline long         isbezier()      { return type & bezier_tag; }
  86     inline void         setbezier()     { type |= bezier_tag; }
  87     inline void         clearbezier()   { type &= ~bezier_tag; }
  88     inline long         npts()          { return pwlArc->npts; }
  89     inline TrimVertex * pts()           { return pwlArc->pts; }
  90     inline REAL *       tail()          { return pwlArc->pts[0].param; }
  91     inline REAL *       head()          { return next->pwlArc->pts[0].param; }
  92     inline REAL *       rhead()         { return pwlArc->pts[pwlArc->npts-1].param; }
  93     inline long         ismarked()      { return type & arc_tag; }
  94     inline void         setmark()       { type |= arc_tag; }
  95     inline void         clearmark()     { type &= (~arc_tag); }
  96     inline void         clearside()     { type &= ~(0x7 << 8); }
  97     inline void         setside( arc_side s ) { clearside(); type |= (((long)s)<<8); }
  98     inline arc_side     getside()       { return (arc_side) ((type>>8) & 0x7); }
  99     inline int          getitail()      { return type & tail_tag; }
 100     inline void         setitail()      { type |= tail_tag; }
 101     inline void         clearitail()    { type &= (~tail_tag); }
 102 };
 103
 104 /*--------------------------------------------------------------------------
 105  * Arc - initialize a new Arc with the same type and uid of
 106  *          a given Arc and a given pwl arc
 107  *--------------------------------------------------------------------------
 108  */
 109
 110 inline
 111 Arc::Arc( Arc *j, PwlArc *p )
 112 {
 113     bezierArc = NULL;
 114     pwlArc = p;
 115     type = j->type;
 116     nuid = j->nuid;
 117 }
 118
 119 /*--------------------------------------------------------------------------
 120  * Arc - initialize a new Arc with the same type and uid of
 121  *          a given Arc and a given pwl arc
 122  *--------------------------------------------------------------------------
 123  */
 124
 125 inline
 126 Arc::Arc( arc_side side, long _nuid )
 127 {
 128     bezierArc = NULL;
 129     pwlArc = NULL;
 130     type = 0;
 131     setside( side );
 132     nuid = _nuid;
 133 }
 134
 135 #endif /* __gluarc_h_ */