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  * trimline.h
33  *
34  */
35 
36 #ifndef __glutrimline_h_
37 #define __glutrimline_h_
38 
39 class Arc;
40 class Backend;
41 
42 //#include "trimvertex.h"
43 #include "jarcloc.h"
44 
45 
46 class Trimline {
47 private:
48     TrimVertex**	pts;
49     long 		numverts;
50     long		i;
51     long		size;
52     Jarcloc		jarcl;
53     TrimVertex		t, b;
54     TrimVertex 		*tinterp, *binterp;
55     void		reset( void ) { numverts = 0; }
56     inline void		grow( long );
57     inline void		swap( void );
58     inline void		append( TrimVertex * );
59     static long		interpvert( TrimVertex *, TrimVertex *, TrimVertex *, REAL );
60 
61 
62 
63 public:
64 			Trimline();
65 			~Trimline();
66     void		init( TrimVertex * );
67     void		init( long, Arc_ptr, long );
68     void		getNextPt( void );
69     void		getPrevPt( void );
70     void		getNextPts( REAL, Backend & );
71     void		getPrevPts( REAL, Backend & );
72     void		getNextPts( Arc_ptr );
73     void		getPrevPts( Arc_ptr );
74     inline TrimVertex *	next( void );
75     inline TrimVertex *	prev( void );
76     inline TrimVertex *	first( void );
77     inline TrimVertex *	last( void );
78 };
79 
80 inline TrimVertex *
81 Trimline::next( void )
82 {
83     if( i < numverts) return pts[i++]; else return 0;
84 }
85 
86 inline TrimVertex *
87 Trimline::prev( void )
88 {
89     if( i >= 0 ) return pts[i--]; else return 0;
90 }
91 
92 inline TrimVertex *
93 Trimline::first( void )
94 {
95     i = 0; return pts[i];
96 }
97 
98 inline TrimVertex *
99 Trimline::last( void )
100 {
101     i = numverts; return pts[--i];
102 }
103 #endif /* __glutrimline_h_ */
104