Function hero_behind_chokepoint

src/muse.c:1343–1367

from monster's point of view, is hero behind a chokepoint? */

/* from monster's point of view, is hero behind a chokepoint? */
staticfn boolean
hero_behind_chokepoint(struct monst *mtmp)
{
    coordxy dx = sgn(mtmp->mx - mtmp->mux);
    coordxy dy = sgn(mtmp->my - mtmp->muy);

    coordxy x = mtmp->mux + dx;
    coordxy y = mtmp->muy + dy;

    int dir = xytodir(dx, dy);
    int dir_l = DIR_CLAMP(DIR_LEFT2(dir));
    int dir_r = DIR_CLAMP(DIR_RIGHT2(dir));

    coord c1, c2;

    dirtocoord(&c1, dir_l);
    dirtocoord(&c2, dir_r);
    c1.x += x, c2.x += x;
    c1.y += y, c2.y += y;

    if ((!isok(c1.x, c1.y) || !accessible(c1.x, c1.y))
        && (!isok(c2.x, c2.y) || !accessible(c2.x, c2.y)))
        return TRUE;
    return FALSE;
}

/* hostile monster has another hostile next to it */
staticfn boolean