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/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
*/
/*
* arc.h
*
* $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
* $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/arc.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
*/
#ifndef __gluarc_h_
#define __gluarc_h_
#include "myassert.h"
#include "bufpool.h"
#include "mystdio.h"
#include "types.h"
#include "pwlarc.h"
#include "trimvertex.h"
class Bin;
class Arc;
struct BezierArc;
typedef class Arc *Arc_ptr;
enum arc_side { arc_none = 0, arc_right, arc_top, arc_left, arc_bottom };
class Arc: public PooledObj { /* an arc, in two list, the trim list and bin */
public:
static const int bezier_tag;
static const int arc_tag;
static const int tail_tag;
Arc_ptr prev; /* trim list pointer */
Arc_ptr next; /* trim list pointer */
Arc_ptr link; /* bin pointers */
BezierArc * bezierArc; /* associated bezier arc */
PwlArc * pwlArc; /* associated pwl arc */
long type; /* curve type */
long nuid;
inline Arc( Arc *, PwlArc * );
inline Arc( arc_side, long );
Arc_ptr append( Arc_ptr );
int check( void );
int isMonotone( void );
int isDisconnected( void );
int numpts( void );
void markverts( void );
void getextrema( Arc_ptr[4] );
void print( void );
void show( void );
void makeSide( PwlArc *, arc_side );
inline int isTessellated() { return pwlArc ? 1 : 0; }
inline long isbezier() { return type & bezier_tag; }
inline void setbezier() { type |= bezier_tag; }
inline void clearbezier() { type &= ~bezier_tag; }
inline long npts() { return pwlArc->npts; }
inline TrimVertex * pts() { return pwlArc->pts; }
inline REAL * tail() { return pwlArc->pts[0].param; }
inline REAL * head() { return next->pwlArc->pts[0].param; }
inline REAL * rhead() { return pwlArc->pts[pwlArc->npts-1].param; }
inline long ismarked() { return type & arc_tag; }
inline void setmark() { type |= arc_tag; }
inline void clearmark() { type &= (~arc_tag); }
inline void clearside() { type &= ~(0x7 << 8); }
inline void setside( arc_side s ) { clearside(); type |= (((long)s)<<8); }
inline arc_side getside() { return (arc_side) ((type>>8) & 0x7); }
inline int getitail() { return type & tail_tag; }
inline void setitail() { type |= tail_tag; }
inline void clearitail() { type &= (~tail_tag); }
};
/*--------------------------------------------------------------------------
* Arc - initialize a new Arc with the same type and uid of
* a given Arc and a given pwl arc
*--------------------------------------------------------------------------
*/
inline
Arc::Arc( Arc *j, PwlArc *p )
{
bezierArc = NULL;
pwlArc = p;
type = j->type;
nuid = j->nuid;
}
/*--------------------------------------------------------------------------
* Arc - initialize a new Arc with the same type and uid of
* a given Arc and a given pwl arc
*--------------------------------------------------------------------------
*/
inline
Arc::Arc( arc_side side, long _nuid )
{
bezierArc = NULL;
pwlArc = NULL;
type = 0;
setside( side );
nuid = _nuid;
}
#endif /* __gluarc_h_ */
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