Function visible_region_at

src/region.c:717–729

* Check if a spot is under a visible region (eg: gas cloud). * Returns NULL if not, otherwise returns region. */

 * Returns NULL if not, otherwise returns region.
 */
NhRegion *
visible_region_at(coordxy x, coordxy y)
{
    int i;

    for (i = 0; i < svn.n_regions; i++) {
        if (!gr.regions[i]->visible || gr.regions[i]->ttl == -2L)
            continue;
        if (inside_region(gr.regions[i], x, y))
            return gr.regions[i];
    }
    return (NhRegion *) 0;
}

void
show_region(NhRegion *reg, coordxy x, coordxy y)