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 * arc.h
33 *
34 */
35
36#ifndef __gluarc_h_
37#define __gluarc_h_
38
39#include "myassert.h"
40#include "bufpool.h"
41#include "mystdio.h"
42#include "types.h"
43#include "pwlarc.h"
44#include "trimvertex.h"
45
46class Bin;
47class Arc;
48struct BezierArc;
49
50typedef class Arc *Arc_ptr;
51
52enum arc_side { arc_none = 0, arc_right, arc_top, arc_left, arc_bottom };
53
54
55class Arc: public PooledObj { /* an arc, in two list, the trim list and bin */
56
57public:
58    static const int bezier_tag;
59    static const int arc_tag;
60    static const int tail_tag;
61    Arc_ptr		prev;		/* trim list pointer */
62    Arc_ptr		next;		/* trim list pointer */
63    Arc_ptr		link;		/* bin pointers */
64    BezierArc *		bezierArc;	/* associated bezier arc */
65    PwlArc *		pwlArc;	/* associated pwl arc */
66    long		type;		/* curve type */
67    long		nuid;
68
69    inline		Arc( Arc *, PwlArc * );
70    inline		Arc( arc_side, long );
71
72    Arc_ptr		append( Arc_ptr );
73    int			check( void );
74    int			isMonotone( void );
75    int			isDisconnected( void );
76    int			numpts( void );
77    void		markverts( void );
78    void		getextrema( Arc_ptr[4] );
79    void		print( void );
80    void		show( void );
81    void		makeSide( PwlArc *, arc_side );
82    inline int		isTessellated() { return pwlArc ? 1 : 0; }
83    inline long 	isbezier() 	{ return type & bezier_tag; }
84    inline void 	setbezier() 	{ type |= bezier_tag; }
85    inline void 	clearbezier() 	{ type &= ~bezier_tag; }
86    inline long		npts() 		{ return pwlArc->npts; }
87    inline TrimVertex *	pts() 		{ return pwlArc->pts; }
88    inline REAL * 	tail() 		{ return pwlArc->pts[0].param; }
89    inline REAL * 	head() 		{ return next->pwlArc->pts[0].param; }
90    inline REAL *	rhead() 	{ return pwlArc->pts[pwlArc->npts-1].param; }
91    inline long		ismarked()	{ return type & arc_tag; }
92    inline void		setmark()	{ type |= arc_tag; }
93    inline void		clearmark()	{ type &= (~arc_tag); }
94    inline void		clearside() 	{ type &= ~(0x7 << 8); }
95    inline void		setside( arc_side s ) { clearside(); type |= (((long)s)<<8); }
96    inline arc_side	getside() 	{ return (arc_side) ((type>>8) & 0x7); }
97    inline int		getitail()	{ return type & tail_tag; }
98    inline void		setitail()	{ type |= tail_tag; }
99    inline void		clearitail()	{ type &= (~tail_tag); }
100};
101
102/*--------------------------------------------------------------------------
103 * Arc - initialize a new Arc with the same type and uid of
104 *	    a given Arc and a given pwl arc
105 *--------------------------------------------------------------------------
106 */
107
108inline
109Arc::Arc( Arc *j, PwlArc *p )
110{
111    prev = NULL;
112    next = NULL;
113    link = NULL;
114    bezierArc = NULL;
115    pwlArc = p;
116    type = j->type;
117    nuid = j->nuid;
118}
119
120/*--------------------------------------------------------------------------
121 * Arc - initialize a new Arc with the same type and uid of
122 *	    a given Arc and a given pwl arc
123 *--------------------------------------------------------------------------
124 */
125
126inline
127Arc::Arc( arc_side side, long _nuid )
128{
129    prev = NULL;
130    next = NULL;
131    link = NULL;
132    bezierArc = NULL;
133    pwlArc = NULL;
134    type = 0;
135    setside( side );
136    nuid = _nuid;
137}
138
139#endif /* __gluarc_h_ */
140