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:
10 ** http://oss.sgi.com/projects/FreeB
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.
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.
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.
38 * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
39 * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/knotvector.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
42 #include "glimports.h"
45 #include "knotvector.h"
49 void Knotvector::init( long _knotcount
, long _stride
, long _order
, INREAL
*_knotlist
)
51 knotcount
= _knotcount
;
54 knotlist
= new Knot
[_knotcount
];
55 assert( knotlist
!= 0 );
57 for( int i
= 0; i
!= _knotcount
; i
++ )
58 knotlist
[i
] = (Knot
) _knotlist
[i
];
61 Knotvector::Knotvector( void )
66 Knotvector::~Knotvector( void )
68 if( knotlist
) delete[] knotlist
;
71 int Knotvector::validate( void )
73 /* kindex is used as an array index so subtract one first,
74 * this propagates throughout the code so study carefully */
75 long kindex
= knotcount
-1;
77 if( order
< 1 || order
> MAXORDER
) {
78 // spline order un-supported
82 if( knotcount
< (2 * order
) ) {
87 if( identical( knotlist
[kindex
-(order
-1)], knotlist
[order
-1]) ) {
88 // valid knot range is empty
92 for( long i
= 0; i
< kindex
; i
++)
93 if( knotlist
[i
] > knotlist
[i
+1] ) {
94 // decreasing knot sequence
98 /* check for valid multiplicity */
100 /* kindex is currently the index of the last knot.
101 * In the next loop it is decremented to ignore the last knot
102 * and the loop stops when kindex is 2 so as to ignore the first
103 * knot as well. These knots are not used in computing
104 * knot multiplicities.
108 for( ; kindex
>= 1; kindex
-- ) {
109 if( knotlist
[kindex
] - knotlist
[kindex
-1] < TOLERANCE
) {
113 if ( multi
> order
) {
114 // knot multiplicity greater than order of spline
120 if ( multi
> order
) {
121 // knot multiplicity greater than order of spline
128 void Knotvector::show( char *msg
)
131 dprintf( "%s\n", msg
);
132 dprintf( "order = %ld, count = %ld\n", order
, knotcount
);
134 for( int i
=0; i
<knotcount
; i
++ )
135 dprintf( "knot[%d] = %g\n", i
, knotlist
[i
] );