header file for merge.c

   see qh-merge.htm and merge.c

   copyright (c) 1993-2002, The Geometry Center

#ifndef qhDEFmerge
#define qhDEFmerge 1

/*============ -constants- ==============*/


    indicates redundant merge in mergeT->angle
#define qh_ANGLEredundant 6.0

    indicates degenerate facet in mergeT->angle
#define qh_ANGLEdegen     5.0

    offset to indicate concave facets in mergeT->angle
    concave facets are assigned the range of [2,4] in mergeT->angle
    roundoff error may make the angle less than 2
#define qh_ANGLEconcave  1.5

  MRG... (mergeType)
    indicates the type of a merge (mergeT->type)
typedef enum {	/* in sort order for facet_mergeset */
  MRGnone= 0,
  MRGcoplanar,		/* centrum coplanar */
  MRGanglecoplanar,	/* angle coplanar */
  			/* could detect half concave ridges */
  MRGconcave,		/* concave ridge */
  MRGflip,		/* flipped facet. facet1 == facet2 */
  MRGridge,		/* duplicate ridge (qh_MERGEridge) */
                        /* degen and redundant go onto degen_mergeset */
  MRGdegen,		/* degenerate facet (not enough neighbors) facet1 == facet2 */
  MRGredundant,		/* redundant facet (vertex subset) */
  			/* merge_degenredundant assumes degen < redundant */
  MRGmirror,	        /* mirror facet from qh_triangulate */
} mergeType;

    flag for qh_mergefacet() to indicate an apex merge  
#define qh_MERGEapex     True

/*============ -structures- ====================*/

    structure used to merge facets

typedef struct mergeT mergeT;
struct mergeT {		/* initialize in qh_appendmergeset */
  realT   angle;        /* angle between normals of facet1 and facet2 */
  facetT *facet1; 	/* will merge facet1 into facet2 */
  facetT *facet2;
  mergeType type;

/*=========== -macros- =========================*/

  FOREACHmerge_( merges ) {...}
    assign 'merge' to each merge in merges
    uses 'mergeT *merge, **mergep;'
    if qh_mergefacet(),
      restart since qh.facet_mergeset may change
    see FOREACHsetelement_
#define FOREACHmerge_( merges ) FOREACHsetelement_(mergeT, merges, merge)

/*============ prototypes in alphabetical order after pre/postmerge =======*/

void    qh_premerge (vertexT *apex, realT maxcentrum, realT maxangle);
void    qh_postmerge (char *reason, realT maxcentrum, realT maxangle, 
             boolT vneighbors);
void    qh_all_merges (boolT othermerge, boolT vneighbors);
void    qh_appendmergeset(facetT *facet, facetT *neighbor, mergeType mergetype, realT *angle);
setT   *qh_basevertices( facetT *samecycle);
void    qh_checkconnect (void /* qh new_facets */);
boolT   qh_checkzero (boolT testall);
void    qh_copynonconvex (ridgeT *atridge);
void    qh_degen_redundant_facet (facetT *facet);
void   	qh_degen_redundant_neighbors (facetT *facet, facetT *delfacet);
vertexT *qh_find_newvertex (vertexT *oldvertex, setT *vertices, setT *ridges);
void    qh_findbest_test (boolT testcentrum, facetT *facet, facetT *neighbor,
           facetT **bestfacet, realT *distp, realT *mindistp, realT *maxdistp);
facetT *qh_findbestneighbor(facetT *facet, realT *distp, realT *mindistp, realT *maxdistp);
void 	qh_flippedmerges(facetT *facetlist, boolT *wasmerge);
void 	qh_forcedmerges( boolT *wasmerge);
void	qh_getmergeset(facetT *facetlist);
void 	qh_getmergeset_initial (facetT *facetlist);
void    qh_hashridge (setT *hashtable, int hashsize, ridgeT *ridge, vertexT *oldvertex);
ridgeT *qh_hashridge_find (setT *hashtable, int hashsize, ridgeT *ridge, 
              vertexT *vertex, vertexT *oldvertex, int *hashslot);
void 	qh_makeridges(facetT *facet);
void    qh_mark_dupridges(facetT *facetlist);
void    qh_maydropneighbor (facetT *facet);
int     qh_merge_degenredundant (void);
void    qh_merge_nonconvex( facetT *facet1, facetT *facet2, mergeType mergetype);
void    qh_mergecycle (facetT *samecycle, facetT *newfacet);
void    qh_mergecycle_all (facetT *facetlist, boolT *wasmerge);
void    qh_mergecycle_facets( facetT *samecycle, facetT *newfacet);
void    qh_mergecycle_neighbors(facetT *samecycle, facetT *newfacet);
void    qh_mergecycle_ridges(facetT *samecycle, facetT *newfacet);
void    qh_mergecycle_vneighbors( facetT *samecycle, facetT *newfacet);
void 	qh_mergefacet(facetT *facet1, facetT *facet2, realT *mindist, realT *maxdist, boolT mergeapex);
void    qh_mergefacet2d (facetT *facet1, facetT *facet2);
void 	qh_mergeneighbors(facetT *facet1, facetT *facet2);
void 	qh_mergeridges(facetT *facet1, facetT *facet2);
void    qh_mergesimplex(facetT *facet1, facetT *facet2, boolT mergeapex);
void    qh_mergevertex_del (vertexT *vertex, facetT *facet1, facetT *facet2);
void    qh_mergevertex_neighbors(facetT *facet1, facetT *facet2);
void	qh_mergevertices(setT *vertices1, setT **vertices);
setT   *qh_neighbor_intersections (vertexT *vertex);
void    qh_newvertices (setT *vertices);
boolT   qh_reducevertices (void);
vertexT *qh_redundant_vertex (vertexT *vertex);
boolT   qh_remove_extravertices (facetT *facet);
vertexT *qh_rename_sharedvertex (vertexT *vertex, facetT *facet);
void	qh_renameridgevertex(ridgeT *ridge, vertexT *oldvertex, vertexT *newvertex);
void    qh_renamevertex(vertexT *oldvertex, vertexT *newvertex, setT *ridges,
			facetT *oldfacet, facetT *neighborA);
boolT 	qh_test_appendmerge (facetT *facet, facetT *neighbor);
boolT   qh_test_vneighbors (void /* qh newfacet_list */);
void    qh_tracemerge (facetT *facet1, facetT *facet2);
void    qh_tracemerging (void);
void    qh_updatetested( facetT *facet1, facetT *facet2);
setT   *qh_vertexridges (vertexT *vertex);
void    qh_vertexridges_facet (vertexT *vertex, facetT *facet, setT **ridges);
void    qh_willdelete (facetT *facet, facetT *replace);

#endif /* qhDEFmerge */