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

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00001 /* $Id: edges.h,v 1.1.1.1 2004/12/23 04:05:11 ellson Exp $ $Revision: 1.1.1.1 $ */
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 EDGES_H
00024 #define EDGES_H
00025 
00026 #include "site.h"
00027 
00028     typedef struct Edge {
00029         double a, b, c;         /* edge on line ax + by = c */
00030         Site *ep[2];            /* endpoints (vertices) of edge; initially NULL */
00031         Site *reg[2];           /* sites forming edge */
00032         int edgenbr;
00033     } Edge;
00034 
00035 #define le 0
00036 #define re 1
00037 
00038     extern double pxmin, pxmax, pymin, pymax;   /* clipping window */
00039     extern void edgeinit(void);
00040     extern void endpoint(Edge *, int, Site *);
00041     extern void clip_line(Edge * e);
00042     extern Edge *bisect(Site *, Site *);
00043 
00044 #endif
00045 
00046 #ifdef __cplusplus
00047 }
00048 #endif

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