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

   1 /*
   2 ** License Applicability. Except to the extent portions of this file are
   3 ** made subject to an alternative license as permitted in the SGI Free
   4 ** Software License B, Version 1.1 (the "License"), the contents of this
   5 ** file are subject only to the provisions of the License. You may not use
   6 ** this file except in compliance with the License. You may obtain a copy
   7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
   9 **
  10 ** http://oss.sgi.com/projects/FreeB
  11 **
  12 ** Note that, as provided in the License, the Software is distributed on an
  13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  17 **
  18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  21 ** Copyright in any portions created by third parties is as indicated
  22 ** elsewhere herein. All Rights Reserved.
  23 **
  24 ** Additional Notice Provisions: The application programming interfaces
  25 ** established by SGI in conjunction with the Original Code are The
  26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  31 ** published by SGI, but has not been independently verified as being
  32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  33 */
  34
  35 /*
  36  * trimline.h
  37  *
  38  */
  39
  40 #ifndef __glutrimline_h_
  41 #define __glutrimline_h_
  42
  43 class Arc;
  44 class Backend;
  45
  46 #include "trimvertex.h"
  47 #include "jarcloc.h"
  48
  49
  50 class Trimline {
  51 private:
  52     TrimVertex**        pts;
  53     long                numverts;
  54     long                i;
  55     long                size;
  56     Jarcloc             jarcl;
  57     TrimVertex          t, b;
  58     TrimVertex          *tinterp, *binterp;
  59     void                reset( void ) { numverts = 0; }
  60     inline void         grow( long );
  61     inline void         swap( void );
  62     inline void         append( TrimVertex * );
  63     static long         interpvert( TrimVertex *, TrimVertex *, TrimVertex *, REAL );
  64
  65
  66
  67 public:
  68                         Trimline();
  69                         ~Trimline();
  70     void                init( TrimVertex * );
  71     void                init( long, Arc_ptr, long );
  72     void                getNextPt( void );
  73     void                getPrevPt( void );
  74     void                getNextPts( REAL, Backend & );
  75     void                getPrevPts( REAL, Backend & );
  76     void                getNextPts( Arc_ptr );
  77     void                getPrevPts( Arc_ptr );
  78     inline TrimVertex * next( void );
  79     inline TrimVertex * prev( void );
  80     inline TrimVertex * first( void );
  81     inline TrimVertex * last( void );
  82 };
  83
  84 inline TrimVertex *
  85 Trimline::next( void )
  86 {
  87     if( i < numverts) return pts[i++]; else return 0;
  88 }
  89
  90 inline TrimVertex *
  91 Trimline::prev( void )
  92 {
  93     if( i >= 0 ) return pts[i--]; else return 0;
  94 }
  95
  96 inline TrimVertex *
  97 Trimline::first( void )
  98 {
  99     i = 0; return pts[i];
 100 }
 101
 102 inline TrimVertex *
 103 Trimline::last( void )
 104 {
 105     i = numverts; return pts[--i];
 106 }
 107 #endif /* __glutrimline_h_ */