edges.h

Go to the documentation of this file.

/*************************************************************************
 * 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
 
#include <stdbool.h>
#include <util/api.h>
#include <util/arena.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <neatogen/site.h>
 
    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 */
PRIVATE void endpoint(Edge *, int, Site *, arena_t *);
PRIVATE void clip_line(Edge * e);
PRIVATE Edge *gvbisect(Site *, Site *, arena_t *);
 
#ifdef __cplusplus
}
#endif