Function _do_split

crawl-ref/source/mon-abil.cc:244–329

Create a new slime creature at 'target', and split 'thing''s hp and merge count with the new monster. Returns the new slime (nullptr if it fails).

// merge count with the new monster.
// Returns the new slime (nullptr if it fails).
static monster* _do_split(monster* thing, const coord_def & target, bool quiet = false)
{
    ASSERT(thing); // XXX: change to monster &thing
    ASSERT(thing->alive());

    // Create a new slime.
    monster_type type = thing->type == MONS_SLYMDRA ? MONS_SLIME_CREATURE
                                                    : thing->type;
    mgen_data new_slime_data = mgen_data(type,
                                         SAME_ATTITUDE(thing),
                                         target,
                                         thing->foe,
                                         MG_FORCE_PLACE);

    // Don't explicitly announce the child slime coming into view if you
    // saw the split that created it
    if (you.can_see(*thing))
        new_slime_data.extra_flags |= MF_WAS_IN_VIEW;

    monster *new_slime = create_monster(new_slime_data);

    if (!new_slime)
        return 0;

    if (!quiet && you.can_see(*thing))
    {
        if (thing->type == MONS_SLYMDRA)
        {
            mprf("%s separates from %s.", new_slime->name(DESC_A).c_str(),
                                          thing->name(DESC_A).c_str());
        }
        else
            mprf("%s splits.", thing->name(DESC_A).c_str());
    }

    // Inflict the new slime with any enchantments on the parent.
    _share_ench_durations(thing, new_slime);
    new_slime->attitude = thing->attitude;
    new_slime->behaviour = thing->behaviour;
    new_slime->flags = thing->flags;
    new_slime->props = thing->props;
    new_slime->summoner = thing->summoner;
    if (thing->props.exists(BLAME_KEY))
        new_slime->props[BLAME_KEY] = thing->props[BLAME_KEY].get_vector();
    if (thing->type == MONS_SLYMDRA)
    {
        new_slime->props.erase(POLY_SET_KEY);
        init_poly_set(new_slime);
    }

    // Lose heads and HP equivalent to those heads
    if (thing->type == MONS_SLYMDRA)
    {
        --thing->num_heads;
        const monsterentry *m_ent = get_monster_data(MONS_SLYMDRA);

        const int new_avg_hp = div_rand_round(m_ent->avg_hp_10x * thing->get_hit_dice(), m_ent->HD);
        const int hp = hit_points(new_avg_hp) + SLYMDRA_HP_PER_HEAD * thing->num_heads;