reactos/dll/win32/glu32/libnurbs/internals/arcsorter.cc

   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  * arcsorter.c++
  37  *
  38  * $Date$ $Revision: 1.1 $
  39  * $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libnurbs/internals/arcsorter.cc,v 1.1 2004/02/02 16:39:10 navaraf Exp $
  40  */
  41
  42 #ifndef __gluarcsorter_c_
  43 #define __gluarcsorter_c_
  44
  45 #include "glimports.h"
  46 #include "arc.h"
  47 #include "arcsorter.h"
  48 #include "subdivider.h"
  49
  50 ArcSorter::ArcSorter(Subdivider &s) : Sorter( sizeof( Arc ** ) ), subdivider(s)
  51 {
  52 }
  53
  54 int
  55 ArcSorter::qscmp( char *, char * )
  56 {
  57     dprintf( "ArcSorter::qscmp: pure virtual called\n" );
  58     return 0;
  59 }
  60
  61 void
  62 ArcSorter::qsort( Arc **a, int n )
  63 {
  64     Sorter::qsort( (void *) a, n );
  65 }
  66
  67 void
  68 ArcSorter::qsexc( char *i, char *j )// i<-j, j<-i
  69 {
  70     Arc **jarc1 = (Arc **) i;
  71     Arc **jarc2 = (Arc **) j;
  72     Arc *tmp = *jarc1;
  73     *jarc1 = *jarc2;
  74     *jarc2 = tmp;
  75 }
  76
  77 void
  78 ArcSorter::qstexc( char *i, char *j, char *k )// i<-k, k<-j, j<-i
  79 {
  80     Arc **jarc1 = (Arc **) i;
  81     Arc **jarc2 = (Arc **) j;
  82     Arc **jarc3 = (Arc **) k;
  83     Arc *tmp = *jarc1;
  84     *jarc1 = *jarc3;
  85     *jarc3 = *jarc2;
  86     *jarc2 = tmp;
  87 }
  88
  89
  90 ArcSdirSorter::ArcSdirSorter( Subdivider &s ) : ArcSorter(s)
  91 {
  92 }
  93
  94 int
  95 ArcSdirSorter::qscmp( char *i, char *j )
  96 {
  97     Arc *jarc1 = *(Arc **) i;
  98     Arc *jarc2 = *(Arc **) j;
  99
 100     int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1));
 101     int v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1));
 102
 103     REAL diff =  jarc1->pwlArc->pts[v1].param[1] -
 104                  jarc2->pwlArc->pts[v2].param[1];
 105
 106     if( diff < 0.0)
 107         return -1;
 108     else if( diff > 0.0)
 109         return 1;
 110     else {
 111         if( v1 == 0 ) {
 112             if( jarc2->tail()[0] < jarc1->tail()[0] ) {
 113                 return subdivider.ccwTurn_sl( jarc2, jarc1 ) ? 1 : -1;
 114             } else {
 115                 return subdivider.ccwTurn_sr( jarc2, jarc1 ) ? -1 : 1;
 116             }
 117         } else {
 118             if( jarc2->head()[0] < jarc1->head()[0] ) {
 119                 return subdivider.ccwTurn_sl( jarc1, jarc2 ) ? -1 : 1;
 120             } else {
 121                 return subdivider.ccwTurn_sr( jarc1, jarc2 ) ? 1 : -1;
 122             }
 123         }
 124     }
 125 }
 126
 127 ArcTdirSorter::ArcTdirSorter( Subdivider &s ) : ArcSorter(s)
 128 {
 129 }
 130
 131 /*----------------------------------------------------------------------------
 132  * ArcTdirSorter::qscmp -
 133   *                compare two axis monotone arcs that are incident
 134  *                 to the line T == compare_value. Determine which of the
 135  *                 two intersects that line with a LESSER S value.  If
 136  *                 jarc1 does, return 1.  If jarc2 does, return -1.
 137  *----------------------------------------------------------------------------
 138  */
 139 int
 140 ArcTdirSorter::qscmp( char *i, char *j )
 141 {
 142     Arc *jarc1 = *(Arc **) i;
 143     Arc *jarc2 = *(Arc **) j;
 144
 145     int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1));
 146     int v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1));
 147
 148     REAL diff =  jarc1->pwlArc->pts[v1].param[0] -
 149                  jarc2->pwlArc->pts[v2].param[0];
 150
 151     if( diff < 0.0)
 152         return 1;
 153     else if( diff > 0.0)
 154         return -1;
 155     else {
 156         if( v1 == 0 ) {
 157             if (jarc2->tail()[1] < jarc1->tail()[1]) {
 158                 return subdivider.ccwTurn_tl( jarc2, jarc1 ) ? 1 : -1;
 159             } else {
 160                 return subdivider.ccwTurn_tr( jarc2, jarc1 ) ? -1 : 1;
 161             }
 162         } else {
 163             if( jarc2->head()[1] < jarc1->head()[1] )  {
 164                 return subdivider.ccwTurn_tl( jarc1, jarc2 ) ? -1 : 1;
 165             } else {
 166                 return subdivider.ccwTurn_tr( jarc1, jarc2 ) ? 1 : -1;
 167             }
 168         }
 169     }
 170 }
 171
 172
 173
 174 #endif /* __gluarcsorter_c_ */