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 * knotvector.h 33 * 34 */ 35 36 #ifndef __gluknotvector_h_ 37 #define __gluknotvector_h_ 38 39 #include "types.h" 40 41 struct Knotvector { /* a knot vector */ 42 Knotvector( void ); 43 ~Knotvector( void ); 44 void init( long, long, long, INREAL * ); 45 int validate( void ); 46 void show( const char * ); 47 48 long order; /* order of spline */ 49 long knotcount; /* number of knots */ 50 long stride; /* bytes between points */ 51 Knot * knotlist; /* global knot vector */ 52 }; 53 54 /* tolerance to test knot coincidence */ 55 #define TOLERANCE 1.0e-5 56 57 inline int 58 identical( Knot x, Knot y ) 59 { 60 return ((x-y) < TOLERANCE) ? 1 : 0; 61 } 62 #endif /* __gluknotvector_h_ */ 63