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139 lines
4 KiB
C++
139 lines
4 KiB
C++
/*
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** License Applicability. Except to the extent portions of this file are
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** made subject to an alternative license as permitted in the SGI Free
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** Software License B, Version 1.1 (the "License"), the contents of this
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** file are subject only to the provisions of the License. You may not use
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** this file except in compliance with the License. You may obtain a copy
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** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
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** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
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**
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** http://oss.sgi.com/projects/FreeB
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**
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** Note that, as provided in the License, the Software is distributed on an
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** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
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** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
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** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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**
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** Original Code. The Original Code is: OpenGL Sample Implementation,
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** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
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** Copyright in any portions created by third parties is as indicated
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** elsewhere herein. All Rights Reserved.
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**
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** Additional Notice Provisions: The application programming interfaces
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** established by SGI in conjunction with the Original Code are The
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** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
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** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
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** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
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** Window System(R) (Version 1.3), released October 19, 1998. This software
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** was created using the OpenGL(R) version 1.2.1 Sample Implementation
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** published by SGI, but has not been independently verified as being
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** compliant with the OpenGL(R) version 1.2.1 Specification.
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*/
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/*
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* knotvector.c++
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*
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*/
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#include "glimports.h"
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#include "mystdio.h"
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#include "myassert.h"
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#include "knotvector.h"
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#include "defines.h"
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#ifdef __WATCOMC__
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#pragma warning 726 10
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#endif
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void Knotvector::init( long _knotcount, long _stride, long _order, INREAL *_knotlist )
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{
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knotcount = _knotcount;
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stride = _stride;
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order = _order;
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knotlist = new Knot[_knotcount];
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assert( knotlist != 0 );
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for( int i = 0; i != _knotcount; i++ )
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knotlist[i] = (Knot) _knotlist[i];
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}
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Knotvector::Knotvector( void )
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{
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knotlist = 0;
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}
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Knotvector::~Knotvector( void )
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{
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if( knotlist ) delete[] knotlist;
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}
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int Knotvector::validate( void )
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{
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/* kindex is used as an array index so subtract one first,
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* this propagates throughout the code so study carefully */
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long kindex = knotcount-1;
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if( order < 1 || order > MAXORDER ) {
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// spline order un-supported
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return( 1 );
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}
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if( knotcount < (2 * order) ) {
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// too few knots
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return( 2 );
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}
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if( identical( knotlist[kindex-(order-1)], knotlist[order-1]) ) {
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// valid knot range is empty
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return( 3 );
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}
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for( long i = 0; i < kindex; i++)
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if( knotlist[i] > knotlist[i+1] ) {
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// decreasing knot sequence
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return( 4 );
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}
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/* check for valid multiplicity */
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/* kindex is currently the index of the last knot.
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* In the next loop it is decremented to ignore the last knot
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* and the loop stops when kindex is 2 so as to ignore the first
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* knot as well. These knots are not used in computing
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* knot multiplicities.
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*/
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long multi = 1;
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for( ; kindex >= 1; kindex-- ) {
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if( knotlist[kindex] - knotlist[kindex-1] < TOLERANCE ) {
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multi++;
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continue;
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}
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if ( multi > order ) {
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// knot multiplicity greater than order of spline
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return( 5 );
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}
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multi = 1;
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}
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if ( multi > order ) {
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// knot multiplicity greater than order of spline
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return( 5 );
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}
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return 0;
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}
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void Knotvector::show( const char *msg )
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{
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#ifndef NDEBUG
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dprintf( "%s\n", msg );
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dprintf( "order = %ld, count = %ld\n", order, knotcount );
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for( int i=0; i<knotcount; i++ )
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dprintf( "knot[%d] = %g\n", i, knotlist[i] );
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#endif
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}
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