text: /*<html><pre>  -<a                             href="qh-io.htm"
    >-------------------------------</a><a name="TOP">-</a>
  
     io.h 
     declarations of Input/Output functions
  
     see README, qhull.h and io.c
  
     copyright (c) 1993-2002, The Geometry Center
  */
  
  #ifndef qhDEFio
  #define qhDEFio 1
  
  /*============ constants and flags ==================*/
  
  /*-<a                             href="qh-io.htm#TOC"
    >--------------------------------</a><a name="qh_MAXfirst">-</a>
    
    qh_MAXfirst
      maximum length of first two lines of stdin
  */
  #define qh_MAXfirst  200
  
  /*-<a                             href="qh-io.htm#TOC"
    >--------------------------------</a><a name="qh_MINradius">-</a>
    
    qh_MINradius
      min radius for Gp and Gv, fraction of maxcoord
  */
  #define qh_MINradius 0.02
  
  /*-<a                             href="qh-io.htm#TOC"
    >--------------------------------</a><a name="qh_GEOMepsilon">-</a>
    
    qh_GEOMepsilon
      adjust outer planes for 'lines closer' and geomview roundoff.  
      This prevents bleed through.
  */
  #define qh_GEOMepsilon 2e-3
  
  /*-<a                             href="qh-io.htm#TOC"
    >--------------------------------</a><a name="qh_WHITESPACE">-</a>
    
    qh_WHITESPACE
      possible values of white space
  */
  #define qh_WHITESPACE " \n\t\v\r\f"
  
  
  /*-<a                             href="qh-io.htm#TOC"
    >--------------------------------</a><a name="RIDGE">-</a>
    
    qh_RIDGE
      to select which ridges to print in qh_eachvoronoi
  */
  typedef enum
  {
      qh_RIDGEall = 0, qh_RIDGEinner, qh_RIDGEouter
  }
  qh_RIDGE;
  
  /*-<a                             href="qh-io.htm#TOC"
    >--------------------------------</a><a name="printvridgeT">-</a>
    
    printvridgeT
      prints results of qh_printvdiagram
  
    see:
      <a href="io.c#printvridge">qh_printvridge</a> for an example
  */
  typedef void (*printvridgeT)(FILE *fp, vertexT *vertex, vertexT *vertexA, setT *centers, boolT unbounded);
  
  /*============== -prototypes in alphabetical order =========*/
  
  void    dfacet( unsigned id);
  void    dvertex( unsigned id);
  void    qh_countfacets (facetT *facetlist, setT *facets, boolT printall, 
                int *numfacetsp, int *numsimplicialp, int *totneighborsp, 
                int *numridgesp, int *numcoplanarsp, int *numnumtricoplanarsp);
  pointT *qh_detvnorm (vertexT *vertex, vertexT *vertexA, setT *centers, realT *offsetp);
  setT   *qh_detvridge (vertexT *vertex);
  setT   *qh_detvridge3 (vertexT *atvertex, vertexT *vertex);
  int     qh_eachvoronoi (FILE *fp, printvridgeT printvridge, vertexT *atvertex, boolT visitall, qh_RIDGE innerouter, boolT inorder);
  int     qh_eachvoronoi_all (FILE *fp, printvridgeT printvridge, boolT isupper, qh_RIDGE innerouter, boolT inorder);
  void	qh_facet2point(facetT *facet, pointT **point0, pointT **point1, realT *mindist);
  setT   *qh_facetvertices (facetT *facetlist, setT *facets, boolT allfacets);
  void    qh_geomplanes (facetT *facet, realT *outerplane, realT *innerplane);
  void    qh_markkeep (facetT *facetlist);
  setT   *qh_markvoronoi (facetT *facetlist, setT *facets, boolT printall, boolT *islowerp, int *numcentersp);
  void    qh_order_vertexneighbors(vertexT *vertex);
  void	qh_printafacet(FILE *fp, int format, facetT *facet, boolT printall);
  void    qh_printbegin (FILE *fp, int format, facetT *facetlist, setT *facets, boolT printall);
  void 	qh_printcenter (FILE *fp, int format, char *string, facetT *facet);
  void    qh_printcentrum (FILE *fp, facetT *facet, realT radius);
  void    qh_printend (FILE *fp, int format, facetT *facetlist, setT *facets, boolT printall);
  void    qh_printend4geom (FILE *fp, facetT *facet, int *num, boolT printall);
  void    qh_printextremes (FILE *fp, facetT *facetlist, setT *facets, int printall);
  void    qh_printextremes_2d (FILE *fp, facetT *facetlist, setT *facets, int printall);
  void    qh_printextremes_d (FILE *fp, facetT *facetlist, setT *facets, int printall);
  void	qh_printfacet(FILE *fp, facetT *facet);
  void	qh_printfacet2math(FILE *fp, facetT *facet, int notfirst);
  void	qh_printfacet2geom(FILE *fp, facetT *facet, realT color[3]);
  void    qh_printfacet2geom_points(FILE *fp, pointT *point1, pointT *point2,
  			       facetT *facet, realT offset, realT color[3]);
  void	qh_printfacet3math (FILE *fp, facetT *facet, int notfirst);
  void	qh_printfacet3geom_nonsimplicial(FILE *fp, facetT *facet, realT color[3]);
  void	qh_printfacet3geom_points(FILE *fp, setT *points, facetT *facet, realT offset, realT color[3]);
  void	qh_printfacet3geom_simplicial(FILE *fp, facetT *facet, realT color[3]);
  void	qh_printfacet3vertex(FILE *fp, facetT *facet, int format);
  void	qh_printfacet4geom_nonsimplicial(FILE *fp, facetT *facet, realT color[3]);
  void	qh_printfacet4geom_simplicial(FILE *fp, facetT *facet, realT color[3]);
  void	qh_printfacetNvertex_nonsimplicial(FILE *fp, facetT *facet, int id, int format);
  void	qh_printfacetNvertex_simplicial(FILE *fp, facetT *facet, int format);
  void    qh_printfacetheader(FILE *fp, facetT *facet);
  void    qh_printfacetridges(FILE *fp, facetT *facet);
  void	qh_printfacets(FILE *fp, int format, facetT *facetlist, setT *facets, boolT printall);
  void	qh_printhelp_degenerate(FILE *fp);
  void	qh_printhelp_singular(FILE *fp);
  void	qh_printhyperplaneintersection(FILE *fp, facetT *facet1, facetT *facet2,
    		   setT *vertices, realT color[3]);
  void	qh_printneighborhood (FILE *fp, int format, facetT *facetA, facetT *facetB, boolT printall);
  void    qh_printline3geom (FILE *fp, pointT *pointA, pointT *pointB, realT color[3]);
  void	qh_printpoint(FILE *fp, char *string, pointT *point);
  void	qh_printpointid(FILE *fp, char *string, int dim, pointT *point, int id);
  void    qh_printpoint3 (FILE *fp, pointT *point);
  void    qh_printpoints_out (FILE *fp, facetT *facetlist, setT *facets, int printall);
  void    qh_printpointvect (FILE *fp, pointT *point, coordT *normal, pointT *center, realT radius, realT color[3]);
  void    qh_printpointvect2 (FILE *fp, pointT *point, coordT *normal, pointT *center, realT radius);
  void	qh_printridge(FILE *fp, ridgeT *ridge);
  void    qh_printspheres(FILE *fp, setT *vertices, realT radius);
  void    qh_printvdiagram (FILE *fp, int format, facetT *facetlist, setT *facets, boolT printall);
  int     qh_printvdiagram2 (FILE *fp, printvridgeT printvridge, setT *vertices, qh_RIDGE innerouter, boolT inorder);
  void	qh_printvertex(FILE *fp, vertexT *vertex);
  void	qh_printvertexlist (FILE *fp, char* string, facetT *facetlist,
                           setT *facets, boolT printall);
  void	qh_printvertices (FILE *fp, char* string, setT *vertices);
  void    qh_printvneighbors (FILE *fp, facetT* facetlist, setT *facets, boolT printall);
  void    qh_printvoronoi (FILE *fp, int format, facetT *facetlist, setT *facets, boolT printall);
  void    qh_printvnorm (FILE *fp, vertexT *vertex, vertexT *vertexA, setT *centers, boolT unbounded);
  void    qh_printvridge (FILE *fp, vertexT *vertex, vertexT *vertexA, setT *centers, boolT unbounded);
  void	qh_produce_output(void);
  void    qh_projectdim3 (pointT *source, pointT *destination);
  int     qh_readfeasible (int dim, char *remainder);
  coordT *qh_readpoints(int *numpoints, int *dimension, boolT *ismalloc);
  void    qh_setfeasible (int dim);
  boolT	qh_skipfacet(facetT *facet);
  
  #endif /* qhDEFio */
  