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/* $Id: info.c,v 1.1.1.1 2004/12/23 04:05:12 ellson Exp $ $Revision: 1.1.1.1 $ */
/* 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 "neato.h"
#include <stdio.h>
#include "mem.h"
#include "info.h"
Info_t *nodeInfo; /* Array of node info */
static Freelist pfl;
void infoinit()
{
freeinit(&pfl, sizeof(PtItem));
}
/* compare:
* returns -1 if p < q
* 0 if p = q
* 1 if p > q
* if q if NULL, returns -1
* Ordering is by angle from -pi/2 to 3pi/4.
* For equal angles (which should not happen in our context)
* ordering is by closeness to origin.
*/
static int compare(Point * o, PtItem * p, PtItem * q)
{
double x0;
double y0;
double x1;
double y1;
double a, b;
if (q == NULL)
return -1;
if ((p->p.x == q->p.x) && (p->p.y == q->p.y))
return 0;
x0 = ((double) (p->p.x)) - ((double) (o->x));
y0 = ((double) (p->p.y)) - ((double) (o->y));
x1 = ((double) (q->p.x)) - ((double) (o->x));
y1 = ((double) (q->p.y)) - ((double) (o->y));
if (x0 >= 0.0) {
if (x1 < 0.0)
return -1;
else if (x0 > 0.0) {
if (x1 > 0.0) {
a = y1 / x1;
b = y0 / x0;
if (b < a)
return -1;
else if (b > a)
return 1;
else if (x0 < x1)
return -1;
else
return 1;
} else { /* x1 == 0.0 */
if (y1 > 0.0)
return -1;
else
return 1;
}
} else { /* x0 == 0.0 */
if (x1 > 0.0) {
if (y0 <= 0.0)
return -1;
else
return 1;
} else { /* x1 == 0.0 */
if (y0 < y1) {
if (y1 <= 0.0)
return 1;
else
return -1;
} else {
if (y0 <= 0.0)
return -1;
else
return 1;
}
}
}
} else {
if (x1 >= 0.0)
return 1;
else {
a = y1 / x1;
b = y0 / x0;
if (b < a)
return -1;
else if (b > a)
return 1;
else if (x0 > x1)
return -1;
else
return 1;
}
}
}
#if 0 /* not used */
static void printV(PtItem * vp)
{
if (vp == NULL) {
fprintf(stderr, "<empty>\n");
return;
}
while (vp != NULL) {
fprintf(stderr, "(%.16f,%.16f)\n", vp->p.x, vp->p.y);
vp = vp->next;
}
}
static void error(Info_t * ip, Site * s, double x, double y)
{
fprintf(stderr,
"Unsorted vertex list for site %d (%.16f,%.16f), pt (%f,%f)\n",
s->sitenbr, s->coord.x, s->coord.y, x, y);
printV(ip->verts);
}
#endif
#if 0 /* not used */
static int sorted(Point * origin, PtItem * vp)
{
PtItem *next;
if (vp == NULL)
return 1;
next = vp->next;
while (next != NULL) {
if (compare(origin, vp, next) <= 0) {
vp = next;
next = next->next;
} else {
fprintf(stderr, "(%.16f,%.16f) > (%.16f,%.16f)\n",
vp->p.x, vp->p.y, next->p.x, next->p.y);
return 0;
}
}
return 1;
}
#endif
void addVertex(Site * s, double x, double y)
{
Info_t *ip;
PtItem *p;
PtItem *curr;
PtItem *prev;
Point *origin = &(s->coord);
PtItem tmp;
int cmp;
ip = nodeInfo + (s->sitenbr);
curr = ip->verts;
tmp.p.x = x;
tmp.p.y = y;
cmp = compare(origin, &tmp, curr);
if (cmp == 0)
return;
else if (cmp < 0) {
p = (PtItem *) getfree(&pfl);
p->p.x = x;
p->p.y = y;
p->next = curr;
ip->verts = p;
return;
}
prev = curr;
curr = curr->next;
while ((cmp = compare(origin, &tmp, curr)) > 0) {
prev = curr;
curr = curr->next;
}
if (cmp == 0)
return;
p = (PtItem *) getfree(&pfl);
p->p.x = x;
p->p.y = y;
prev->next = p;
p->next = curr;
/* This test should be unnecessary */
/* if (!sorted(origin,ip->verts)) */
/* error (ip,s,x,y); */
}
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