Function selection_do_grow

src/selvar.c:320–367

}

void
selection_do_grow(struct selectionvar *ov, int dir)
{
    coordxy x, y;
    struct selectionvar *tmp;
    NhRect rect = cg.zeroNhRect;

    if (!ov)
        return;

    tmp = selection_new();

    if (dir == W_RANDOM)
        dir = random_wdir();

    selection_getbounds(ov, &rect);

    for (x = max(0, rect.lx-1); x <= min(COLNO-1, rect.hx+1); x++)
        for (y = max(0, rect.ly-1); y <= min(ROWNO-1, rect.hy+1); y++) {
            /* note:  dir is a mask of multiple directions, but the only
               way to specify diagonals is by including the two adjacent
               orthogonal directions, which effectively specifies three-
               way growth [WEST|NORTH => WEST plus WEST|NORTH plus NORTH] */
            if (((dir & W_WEST) && selection_getpoint(x + 1, y, ov))
                || (((dir & (W_WEST | W_NORTH)) == (W_WEST | W_NORTH))
                    && selection_getpoint(x + 1, y + 1, ov))
                || ((dir & W_NORTH) && selection_getpoint(x, y + 1, ov))
                || (((dir & (W_NORTH | W_EAST)) == (W_NORTH | W_EAST))
                    && selection_getpoint(x - 1, y + 1, ov))
                || ((dir & W_EAST) && selection_getpoint(x - 1, y, ov))
                || (((dir & (W_EAST | W_SOUTH)) == (W_EAST | W_SOUTH))
                    && selection_getpoint(x - 1, y - 1, ov))
                || ((dir & W_SOUTH) && selection_getpoint(x, y - 1, ov))
                ||  (((dir & (W_SOUTH | W_WEST)) == (W_SOUTH | W_WEST))
                     && selection_getpoint(x + 1, y - 1, ov))) {
                selection_setpoint(x, y, tmp, 1);
            }
        }

    selection_getbounds(tmp, &rect);

    for (x = rect.lx; x <= rect.hx; x++)
        for (y = rect.ly; y <= rect.hy; y++)
            if (selection_getpoint(x, y, tmp))
                selection_setpoint(x, y, ov, 1);

    selection_free(tmp, TRUE);
}

staticfn int (*selection_flood_check_func)(coordxy, coordxy);