BOX2D_intersects()

Datum BOX2D_intersects

(

PG_FUNCTION_ARGS

)

Definition at line 343 of file lwgeom_box.c.

{
        GBOX *a = (GBOX *) PG_GETARG_POINTER(0);
        GBOX *b = (GBOX *) PG_GETARG_POINTER(1);
        GBOX *n;
 
 
        n = (GBOX *) palloc(sizeof(GBOX));
 
        n->xmax = Min(a->xmax, b->xmax);
        n->ymax = Min(a->ymax, b->ymax);
        n->xmin = Max(a->xmin, b->xmin);
        n->ymin = Max(a->ymin, b->ymin);
 
 
        if (n->xmax < n->xmin || n->ymax < n->ymin)
        {
                pfree(n);
                /* Indicate "no intersection" by returning NULL pointer */
                n = NULL;
        }
 
        PG_RETURN_POINTER(n);
}

References GBOX::xmax, GBOX::xmin, GBOX::ymax, and GBOX::ymin.