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/* $Id: util.c,v 1.5 2009/06/03 01:10:54 ellson Exp $ $Revision: 1.5 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#include <assert.h>
#include <stdlib.h>
#include "pathutil.h"
#ifdef DMALLOC
#include "dmalloc.h"
#endif
#define ALLOC(size,ptr,type) (ptr? (type*)realloc(ptr,(size)*sizeof(type)):(type*)malloc((size)*sizeof(type)))
Ppoly_t copypoly(Ppoly_t argpoly)
{
Ppoly_t rv;
int i;
rv.pn = argpoly.pn;
rv.ps = malloc(sizeof(Ppoint_t) * argpoly.pn);
for (i = 0; i < argpoly.pn; i++)
rv.ps[i] = argpoly.ps[i];
return rv;
}
void freepoly(Ppoly_t argpoly)
{
free(argpoly.ps);
}
int Ppolybarriers(Ppoly_t ** polys, int npolys, Pedge_t ** barriers,
int *n_barriers)
{
Ppoly_t pp;
int i, j, k, n, b;
Pedge_t *bar;
n = 0;
for (i = 0; i < npolys; i++)
n = n + polys[i]->pn;
bar = malloc(n * sizeof(Pedge_t));
b = 0;
for (i = 0; i < npolys; i++) {
pp = *polys[i];
for (j = 0; j < pp.pn; j++) {
k = j + 1;
if (k >= pp.pn)
k = 0;
bar[b].a = pp.ps[j];
bar[b].b = pp.ps[k];
b++;
}
}
assert(b == n);
*barriers = bar;
*n_barriers = n;
return 1;
}
/* make_polyline:
*/
void
make_polyline(Ppolyline_t line, Ppolyline_t* sline)
{
static int isz = 0;
static Ppoint_t* ispline = 0;
int i, j;
int npts = 4 + 3*(line.pn-2);
if (npts > isz) {
ispline = ALLOC(npts, ispline, Ppoint_t);
isz = npts;
}
j = i = 0;
ispline[j+1] = ispline[j] = line.ps[i];
j += 2;
i++;
for (; i < line.pn-1; i++) {
ispline[j+2] = ispline[j+1] = ispline[j] = line.ps[i];
j += 3;
}
ispline[j+1] = ispline[j] = line.ps[i];
sline->pn = npts;
sline->ps = ispline;
}
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