Function map_invisible

src/display.c:377–385

* map_invisible() * * Make the hero remember that a square contains an invisible monster. * This is a special case in that the square will continue to be displayed * this way even when the hero is close enough to see it. To get rid of * this and display the square's actual contents, use unmap_object() followed * by newsym() if necessary. */

 * by newsym() if necessary.
 */
void
map_invisible(coordxy x, coordxy y)
{
    if (x != u.ux || y != u.uy) { /* don't display I at hero's location */
        if (svl.level.flags.hero_memory)
            levl[x][y].glyph = GLYPH_INVISIBLE;
        show_glyph(x, y, GLYPH_INVISIBLE);
    }
}

boolean
unmap_invisible(coordxy x, coordxy y)