arc.h

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/*
 * 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 )
{
    prev = NULL;
    next = NULL;
    link = NULL;
    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 )
{
    prev = NULL;
    next = NULL;
    link = NULL;
    bezierArc = NULL;
    pwlArc = NULL;
    type = 0;
    setside( side );
    nuid = _nuid;
}
 
#endif /* __gluarc_h_ */