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  * jarcloc.h
33  *
34  */
35 
36 #ifndef __glujarcloc_h_
37 #define __glujarcloc_h_
38 
39 #include "arc.h"
40 
41 class Jarcloc {
42 private:
43     Arc_ptr 		arc;
44     TrimVertex		*p;
45     TrimVertex		*plast;
46 public:
47     inline void		init( Arc_ptr a, long first, long last ) { arc = a; p=&a->pwlArc->pts[first]; plast = &a->pwlArc->pts[last]; }
48     inline TrimVertex *	getnextpt( void );
49     inline TrimVertex *	getprevpt( void );
50     inline void		reverse();
51 };
52 
53 inline void
54 Jarcloc::reverse()
55 {
56     if( plast == &arc->pwlArc->pts[0] )
57 	plast =  &arc->pwlArc->pts[arc->pwlArc->npts - 1];
58     else
59 	plast =  &arc->pwlArc->pts[0];
60 }
61 
62 inline TrimVertex *
63 Jarcloc::getnextpt()
64 {
65     assert( p <= plast );
66     if( p == plast ) {
67 	arc = arc->next;
68 	p = &arc->pwlArc->pts[0];
69 	plast = &arc->pwlArc->pts[arc->pwlArc->npts - 1];
70 	assert( p < plast );
71     }
72     return p++;
73 }
74 
75 inline TrimVertex *
76 Jarcloc::getprevpt()
77 {
78     assert( p >= plast );
79     if( p == plast ) {
80 	arc = arc->prev;
81 	p = &arc->pwlArc->pts[arc->pwlArc->npts - 1];
82 	plast = &arc->pwlArc->pts[0];
83 	assert( p > plast );
84     }
85     return p--;
86 }
87 #endif /* __glujarcloc_h_ */
88