site.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
 
#include <stddef.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <neatogen/geometry.h>
 
#if !defined(__CYGWIN__) && defined(__GNUC__) && !defined(__MINGW32__)
#define INTERNAL __attribute__((visibility("hidden")))
#else
#define INTERNAL /* nothing */
#endif
 
// sites are also used as vertices on line segments
typedef struct Site {
  Point coord;
  size_t sitenbr;
  unsigned refcnt;
} Site;
 
extern int siteidx;
extern Site *bottomsite;
 
INTERNAL void siteinit(void);
INTERNAL Site *getsite(void);
INTERNAL double ngdist(Site *, Site *); /* Distance between two sites */
INTERNAL void deref(Site *);            /* Increment refcnt of site  */
INTERNAL void ref(Site *);              /* Decrement refcnt of site  */
INTERNAL void makevertex(Site *);       /* Transform a site into a vertex */
 
#undef INTERNAL
 
#ifdef __cplusplus
}
#endif