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/*-------------------------------------------------------------------------
*
* rtproc.c--
* pg_amproc entries for rtrees.
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/rtree/Attic/rtproc.c,v 1.3 1996/10/23 07:39:23 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#include <string.h>
#include "postgres.h"
#include "utils/geo-decls.h"
#include "utils/palloc.h"
BOX
*rt_box_union(BOX *a, BOX *b)
{
BOX *n;
if ((n = (BOX *) palloc(sizeof (*n))) == (BOX *) NULL)
elog(WARN, "Cannot allocate box for union");
n->xh = Max(a->xh, b->xh);
n->yh = Max(a->yh, b->yh);
n->xl = Min(a->xl, b->xl);
n->yl = Min(a->yl, b->yl);
return (n);
}
BOX *
rt_box_inter(BOX *a, BOX *b)
{
BOX *n;
if ((n = (BOX *) palloc(sizeof (*n))) == (BOX *) NULL)
elog(WARN, "Cannot allocate box for union");
n->xh = Min(a->xh, b->xh);
n->yh = Min(a->yh, b->yh);
n->xl = Max(a->xl, b->xl);
n->yl = Max(a->yl, b->yl);
if (n->xh < n->xl || n->yh < n->yl) {
pfree(n);
return ((BOX *) NULL);
}
return (n);
}
void
rt_box_size(BOX *a, float *size)
{
if (a == (BOX *) NULL || a->xh <= a->xl || a->yh <= a->yl)
*size = 0.0;
else
*size = (float) ((a->xh - a->xl) * (a->yh - a->yl));
return;
}
/*
* rt_bigbox_size() -- Compute a size for big boxes.
*
* In an earlier release of the system, this routine did something
* different from rt_box_size. We now use floats, rather than ints,
* as the return type for the size routine, so we no longer need to
* have a special return type for big boxes.
*/
void
rt_bigbox_size(BOX *a, float *size)
{
rt_box_size(a, size);
}
POLYGON *
rt_poly_union(POLYGON *a, POLYGON *b)
{
POLYGON *p;
p = (POLYGON *)PALLOCTYPE(POLYGON);
if (!PointerIsValid(p))
elog(WARN, "Cannot allocate polygon for union");
memset((char *) p, 0, sizeof(POLYGON)); /* zero any holes */
p->size = sizeof(POLYGON);
p->npts = 0;
p->boundbox.xh = Max(a->boundbox.xh, b->boundbox.xh);
p->boundbox.yh = Max(a->boundbox.yh, b->boundbox.yh);
p->boundbox.xl = Min(a->boundbox.xl, b->boundbox.xl);
p->boundbox.yl = Min(a->boundbox.yl, b->boundbox.yl);
return p;
}
void
rt_poly_size(POLYGON *a, float *size)
{
double xdim, ydim;
size = (float *) palloc(sizeof(float));
if (a == (POLYGON *) NULL ||
a->boundbox.xh <= a->boundbox.xl ||
a->boundbox.yh <= a->boundbox.yl)
*size = 0.0;
else {
xdim = (a->boundbox.xh - a->boundbox.xl);
ydim = (a->boundbox.yh - a->boundbox.yl);
*size = (float) (xdim * ydim);
}
return;
}
POLYGON *
rt_poly_inter(POLYGON *a, POLYGON *b)
{
POLYGON *p;
p = (POLYGON *) PALLOCTYPE(POLYGON);
if (!PointerIsValid(p))
elog(WARN, "Cannot allocate polygon for intersection");
memset((char *) p, 0, sizeof(POLYGON)); /* zero any holes */
p->size = sizeof(POLYGON);
p->npts = 0;
p->boundbox.xh = Min(a->boundbox.xh, b->boundbox.xh);
p->boundbox.yh = Min(a->boundbox.yh, b->boundbox.yh);
p->boundbox.xl = Max(a->boundbox.xl, b->boundbox.xl);
p->boundbox.yl = Max(a->boundbox.yl, b->boundbox.yl);
if (p->boundbox.xh < p->boundbox.xl || p->boundbox.yh < p->boundbox.yl)
{
pfree(p);
return ((POLYGON *) NULL);
}
return (p);
}