/misc/src/release/graphviz-2.18-1/src/graphviz-2.18/lib/neatogen/site.c

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00001 /* $Id: site.c,v 1.1.1.1 2004/12/23 04:05:16 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 #include "mem.h"
00018 #include "site.h"
00019 #include <math.h>
00020 
00021 
00022 int siteidx;
00023 Site *bottomsite;
00024 
00025 static Freelist sfl;
00026 static int nvertices;
00027 
00028 void siteinit()
00029 {
00030     /* double sn; */
00031 
00032     freeinit(&sfl, sizeof(Site));
00033     nvertices = 0;
00034     /* sn = nsites+4; */
00035     /* sqrt_nsites = sqrt(sn); */
00036 }
00037 
00038 
00039 Site *getsite()
00040 {
00041     return ((Site *) getfree(&sfl));
00042 }
00043 
00044 double dist(Site * s, Site * t)
00045 {
00046     double ans;
00047     double dx, dy;
00048 
00049     dx = s->coord.x - t->coord.x;
00050     dy = s->coord.y - t->coord.y;
00051     ans = sqrt(dx * dx + dy * dy);
00052     return ans;
00053 }
00054 
00055 
00056 void makevertex(Site * v)
00057 {
00058     v->sitenbr = nvertices;
00059     nvertices += 1;
00060 #ifdef STANDALONE
00061     out_vertex(v);
00062 #endif
00063 }
00064 
00065 
00066 void deref(Site * v)
00067 {
00068     v->refcnt -= 1;
00069     if (v->refcnt == 0)
00070         makefree(v, &sfl);
00071 }
00072 
00073 void ref(Site * v)
00074 {
00075     v->refcnt += 1;
00076 }

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