/*
** 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.
*/

/*
 * bin.h
 *
 * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
 * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/bin.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
 */

#ifndef __glubin_h_
#define __glubin_h_

#include "myassert.h"
#include "arc.h"
#include "defines.h"

class Bin 
{ /* a linked list of jordan arcs */
private:
    Arc_ptr head;/*first arc on list */
    Arc_ptr		current;	/* current arc on list */
public:
    			Bin();
			~Bin();
    inline Arc_ptr	firstarc( void );
    inline Arc_ptr	nextarc( void );
    inline Arc_ptr	removearc( void );
    inline int		isnonempty( void ) { return (head ? 1 : 0); }
    inline void		addarc( Arc_ptr );
    void 		remove_this_arc( Arc_ptr );
    int			numarcs( void );
    void 		adopt( void );
    void		markall( void );
    void		show( char * );
    void		listBezier( void );
};

/*----------------------------------------------------------------------------
 * Bin::addarc - add an Arc_ptr to head of linked list of Arc_ptr
 *----------------------------------------------------------------------------
 */

inline void
Bin::addarc( Arc_ptr jarc )
{
   jarc->link = head;
   head = jarc;
}

/*----------------------------------------------------------------------------
 * Bin::removearc - remove first Arc_ptr from bin
 *----------------------------------------------------------------------------
 */

inline Arc_ptr
Bin::removearc( void )
{
    Arc_ptr jarc = head;

    if( jarc ) head = jarc->link;
    return jarc;
}


/*----------------------------------------------------------------------------
 * BinIter::nextarc - return current arc in bin and advance pointer to next arc
 *----------------------------------------------------------------------------
 */

inline Arc_ptr
Bin::nextarc( void )
{
    Arc_ptr jarc = current;

#ifdef DEBUG
    assert( jarc->check() != 0 );
#endif

    if( jarc ) current = jarc->link;
    return jarc;
}

/*----------------------------------------------------------------------------
 * BinIter::firstarc - set current arc to first arc of bin advance to next arc
 *----------------------------------------------------------------------------
 */

inline Arc_ptr
Bin::firstarc( void )
{
    current = head;
    return nextarc( );
}

#endif /* __glubin_h_ */
