edges.h

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/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#pragma once
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <neatogen/site.h>
 
#if !defined(__CYGWIN__) && defined(__GNUC__) && !defined(__MINGW32__)
#define INTERNAL __attribute__((visibility("hidden")))
#else
#define INTERNAL /* nothing */
#endif
 
    typedef struct Edge {
        double a, b, c;         /* edge on line ax + by = c */
        Site *ep[2];            /* endpoints (vertices) of edge; initially NULL */
        Site *reg[2];           /* sites forming edge */
    } Edge;
 
#define le 0
#define re 1
 
    extern double pxmin, pxmax, pymin, pymax;   /* clipping window */
INTERNAL void edgeinit(void);
INTERNAL void endpoint(Edge *, int, Site *);
INTERNAL void clip_line(Edge * e);
INTERNAL Edge *gvbisect(Site *, Site *);
 
#undef INTERNAL
 
#ifdef __cplusplus
}
#endif