arc.h

/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice including the dates of first publication and
 * either this permission notice or a reference to
 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Except as contained in this notice, the name of Silicon Graphics, Inc.
 * shall not be used in advertising or otherwise to promote the sale, use or
 * other dealings in this Software without prior written authorization from
 * Silicon Graphics, Inc.
 */

/*
 * arc.h
 *
 */

#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_ */