/misc/src/release/graphviz-2.18-1/src/graphviz-2.18/lib/neatogen/hedges.h

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00001 /* $Id: hedges.h,v 1.2 2005/02/24 00:57:33 ellson Exp $ $Revision: 1.2 $ */
00002 /* vim:set shiftwidth=4 ts=8: */
00003 
00004 /**********************************************************
00005 *      This software is part of the graphviz package      *
00006 *                http://www.graphviz.org/                 *
00007 *                                                         *
00008 *            Copyright (c) 1994-2004 AT&T Corp.           *
00009 *                and is licensed under the                *
00010 *            Common Public License, Version 1.0           *
00011 *                      by AT&T Corp.                      *
00012 *                                                         *
00013 *        Information and Software Systems Research        *
00014 *              AT&T Research, Florham Park NJ             *
00015 **********************************************************/
00016 
00017 #ifdef __cplusplus
00018 extern "C" {
00019 #endif
00020 
00021 
00022 
00023 #ifndef HEDGES_H
00024 #define HEDGES_H
00025 
00026 #include "site.h"
00027 #include "edges.h"
00028 
00029     typedef struct Halfedge {
00030         struct Halfedge *ELleft, *ELright;
00031         Edge *ELedge;
00032         int ELrefcnt;
00033         char ELpm;
00034         Site *vertex;
00035         double ystar;
00036         struct Halfedge *PQnext;
00037     } Halfedge;
00038 
00039     extern Halfedge *ELleftend, *ELrightend;
00040 
00041     extern void ELinitialize(void);
00042     extern void ELcleanup(void);
00043     extern int right_of(Halfedge *, Point *);
00044     extern Site *hintersect(Halfedge *, Halfedge *);
00045     extern Halfedge *HEcreate(Edge *, char);
00046     extern void ELinsert(Halfedge *, Halfedge *);
00047     extern Halfedge *ELleftbnd(Point *);
00048     extern void ELdelete(Halfedge *);
00049     extern Halfedge *ELleft(Halfedge *), *ELright(Halfedge *);
00050     extern Halfedge *ELleftbnd(Point *);
00051     extern Site *leftreg(Halfedge *), *rightreg(Halfedge *);
00052 
00053 #endif
00054 
00055 #ifdef __cplusplus
00056 }
00057 #endif

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