actions.cc

/*
 *  actions.cc - Action controllers for actors.
 *
 *  Copyright (C) 2000-2013  The Exult Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <cstdlib>
#include <cstring>

#include "gamewin.h"
#include "actions.h"
#include "actors.h"
#include "Zombie.h"
#include "Astar.h"
#include "paths.h"
#include "dir.h"
#include "ucmachine.h"
#include "frameseq.h"
#include "ucmachine.h"
#include "cheat.h"
#include "party.h"
#include "monstinf.h"
#include "ignore_unused_variable_warning.h"

using std::cout;
using std::endl;

long Actor_action::seqcnt = 0;

/**
 *  Handle an event and check to see if we were deleted.
 *
 *  @return     Delay value from handle_event (0 if we've been deleted).
 */

int Actor_action::handle_event_safely(
    Actor *actor,
    bool &deleted           // True returned if we're gone!
) {
	Actor_action *old_action = actor->get_action();
	long old_seq = old_action->seq;
	// Do current action.
	int delay = handle_event(actor);
	if (actor->get_action() != old_action ||
	        old_action->seq != old_seq) {
		deleted = true;     // We've been deleted.
		return 0;
	}
	deleted = false;
	return delay;
}

/**
 *  Set to walk from one point to another the dumb way.
 *
 *  @return     this, or 0 if unsuccessful.
 */

Actor_action *Actor_action::walk_to_tile(
    Actor * /* npc */,
    Tile_coord const &src,
    Tile_coord const &dest,
    int /* dist */,         // Ignored.
    bool /* ignnpc */       // Ignored
) {
	Zombie *path = new Zombie();
	get_party = false;
	// Set up new path.
	if (path->NewPath(src, dest, 0))
		return new Path_walking_actor_action(path);
	else {
		delete path;
		return 0;
	}
}

/**
 *  Set up an action to get an actor to a location (via pathfinding), and
 *  then execute another action when he gets there.
 *
 *  @return     action.
 */

Actor_action *Actor_action::create_action_sequence(
    Actor *actor,           // Whom to activate.
    Tile_coord const &dest,     // Where to walk to.
    Actor_action *when_there,   // What to do when he gets there.
    bool from_off_screen,       // Have actor walk from off-screen.
    bool persistant             // Whether or not to keep retrying. Since NPCs
    // move around, this causes them to be ignored
    // as obstacles under many conditions.
) {
	Actor_action *act = when_there;
	Tile_coord actloc = actor->get_tile();
	if (from_off_screen)
		actloc.tx = actloc.ty = -1;
	if (dest != actloc) {   // Get to destination.
		// A persistence of 30 allows sitting on LB's ship from far away without
		// party members teleporting.
		int persistence = persistant ? 30 : 0;
		Actor_action *w = new Path_walking_actor_action(new Astar(), 3, persistence);
		Actor_action *w2 = w->walk_to_tile(actor, actloc, dest, 0, persistant);
		if (w2 != w)
			delete w;
		if (!w2)        // Failed?  Teleport.
			w2 = new Move_actor_action(dest);
		// And teleport if blocked walking.
		Actor_action *tel = new Move_actor_action(dest);
		// Walk there, then do whatever.
		Sequence_actor_action *seq;
		act = seq = new Sequence_actor_action(w2, tel, act);
		seq->set_speed(0);  // No delay between actions.
	}
	return act;
}

/**
 *  Null action.
 */

int Null_action::handle_event(
    Actor *actor
) {
	ignore_unused_variable_warning(actor);
	return 0;
}

/**
 *  Create action to follow a path.
 */

Path_walking_actor_action::Path_walking_actor_action(
    PathFinder *p,          // Pathfinder, or 0 for Astar.
    int maxblk,         // Max. retries when blocked.
    int pers            // Keeps retrying this many times.
) : reached_end(false), path(p), deleted(false), speed(0),
	from_offscreen(false), subseq(0), blocked(0), max_blocked(maxblk),
	persistence(pers) {
	if (!path)
		path = new Astar();
	Tile_coord src = path->get_src(), dest = path->get_dest();
	original_dir = static_cast<int>(Get_direction4(
	                                    src.ty - dest.ty, dest.tx - src.tx));
}

/**
 *  Delete.
 */

Path_walking_actor_action::~Path_walking_actor_action(
) {
	delete path;
	delete subseq;
	subseq = 0;         // (Debugging).
	original_dir = -1;
}

/**
 *  Create action for walking to given destination using Astar.
 *  Note:  This is a static method.
 *
 *  @return     Action if successful, else 0.
 */

Path_walking_actor_action *Path_walking_actor_action::create_path(
    Tile_coord const &src,      // Starting position.
    Tile_coord const &dest,     // Destination.
    Pathfinder_client &cost     // Cost for Astar.
) {
	Astar *path = new Astar();
	// Get to within 1 tile.
	if (path->NewPath(src, dest, &cost))
		return new Path_walking_actor_action(path);
	else {
		delete path;
		return 0;
	}
}

/**
 *  Handle a time event.
 *
 *  @return     0 if done with this action, else delay for next frame.
 */

int Path_walking_actor_action::handle_event(
    Actor *actor
) {
	if (subseq) {       // Going through a door?
		int delay = subseq->handle_event(actor);
		if (delay)
			return delay;   // Still going.
		set_subseq(0);
		// He was stopped, so restore speed.
		actor->set_frame_time(speed);
		return speed;       // Come back in a moment.
	}
	Tile_coord tile;
	if (blocked) {
#if 0
		std::cout << "Actor " << actor->get_name() << " blocked.  Retrying." << std::endl;
#endif
		if (actor->step(blocked_tile, blocked_frame)) {
			// Successful?
			if (deleted) return 0;
			blocked = 0;
			// He was stopped, so restore speed.
			actor->set_frame_time(speed);
			return speed;
		}
		if (deleted)    // step() deleted us.
			return 0;
		else if (blocked++ > max_blocked) {
			// Persistant pathfinder?
			if (!persistence)
				return 0;       // No.
			// "Tire" a bit from retrying.
			persistence--;
			Game_object *block = Game_object::find_blocking(blocked_tile);
			Actor *blk;
			// Being blocked by an NPC?
			if (block && (blk = block->as_actor()) != 0) {
				// Try to create a new path -- the old one might be blocked
				// due to (say) the previously 'non-blocking' NPC now being
				// in a blocking state.
				if (walk_to_tile(actor, actor->get_tile(), path->get_dest(), 0, true)) {
					// Got new path.
					blocked = 0;
					return speed;
				}
			}
			return 0;
		} else      // Wait up to 1.6 secs.
			return 100 + std::rand() % 500;
	}
	int newspeed = actor->get_frame_time();// Get time between frames.
	if (!newspeed) {
		// This may mean bumping into another NPC, then having
		// another NPC call move_aside on you then (e.g., large
		// parties trying to sit on a barge).
		// If the pathfinding NPC is supposed to be persistant, then
		// try to create a new path -- the old one might be blocked
		// due to (say) the previously 'non-blocking' NPC now being
		// in a blocking state.
		if (!persistence ||
		        !walk_to_tile(actor, actor->get_tile(), path->get_dest(), 0, true)) {
			speed = newspeed;
			return 0;       // Not moving.
		} else {
			actor->set_frame_time(speed);
			return speed;
		}
	}
	speed = newspeed;
	bool done;          // So we'll know if this is the last.
	if (!path->GetNextStep(tile, done)
	        // This happens sometimes (bedroll cancel).
	        || (tile == actor->get_tile() && !path->GetNextStep(tile, done))) {
		reached_end = true; // Did it.
		return 0;
	}
	if (done)           // In case we're deleted.
		reached_end = true;
	Tile_coord cur = actor->get_tile();
	int newdir = static_cast<int>(Get_direction4(cur.ty - tile.ty,
	                              tile.tx - cur.tx));
	Frames_sequence *frames = actor->get_frames(newdir);
	int &step_index = actor->get_step_index();
	if (!step_index)        // First time?  Init.
		step_index = frames->find_unrotated(actor->get_framenum());
	// Get next (updates step_index).
	int frame = frames->get_next(step_index);
	int cur_speed = speed;      // Step() might delete us!
	if (from_offscreen) {   // Teleport to 1st spot.
		from_offscreen = false;
		actor->move(tile.tx, tile.ty, tile.tz);
		return cur_speed;
	} else if (actor->step(tile, frame)) { // Successful.
		if (deleted) return 0;
		if (get_party) {    // MUST be the Avatar.
			Game_window *gwin = Game_window::get_instance();
			gwin->get_party_man()->get_followers(newdir);
			if (done)
				gwin->get_main_actor()->get_followers();
		}
		if (done)       // Was this the last step?
			return 0;
		return cur_speed;
	}
	if (deleted) return 0;
	reached_end = false;
	frames->decrement(step_index);  // We didn't take the step.
	// Blocked by a door?
	if (actor->distance(tile) <= 2 &&
	        !cheat.in_map_editor() &&   // And NOT map-editing?
	        actor->is_sentient()) {
		Game_object *door = Game_object::find_door(tile);
		if (door != 0 && door->is_closed_door() &&
		        // Make sure it's not locked!
		        door->get_framenum() % 4 < 2)

			// Try to open it.
		{
			if (open_door(actor, door))
				return speed;
		}
	}
	if (!max_blocked ||     // No retries allowed?
	        actor->is_dormant())    // Or actor off-screen?
		return 0;
	blocked = 1;
	blocked_tile = tile;
	blocked_frame = frame;
	return 100 + std::rand() % 500; // Wait .1 to .6 seconds.
}

/**
 *  Open door that's blocking the NPC, and set action to walk past and
 *  close it.
 *
 *  @return     1 if successful.
 */

int Path_walking_actor_action::open_door(
    Actor *actor,
    Game_object *door
) {
	Tile_coord cur = actor->get_tile();
	// Get door's footprint in tiles.
	Rectangle foot = door->get_footprint();
	// Open it, but kludge quality to
	//   avoid unwanted usecode.
	int savequal = door->get_quality();
	door->set_quality(0);
	door->activate();
	door->set_quality(savequal);
	Tile_coord past;        // Tile on other side of door.
	past.tz = cur.tz;
	int dir;            // Get dir to face door afterwards.
	if (foot.w > foot.h) {      // Horizontal?
		past.tx = foot.x + foot.w / 2;
		if (cur.ty <= foot.y) { // N. of door?
			past.ty = foot.y + foot.h;
			dir = 0;
		} else {        // S. of door?
			past.ty = foot.y - 1;
			dir = 4;
		}
	} else {            // Vertical.
		past.ty = foot.y + foot.h / 2;
		if (cur.tx <= foot.x) { // W. of door?
			past.tx = foot.x + foot.w;
			dir = 6;
		} else {        // E. of door?
			past.tx = foot.x - 1;
			dir = 2;
		}
	}
	Map_chunk::find_spot(past, 1, actor, 1);
	if (past.tx != -1) {    // Succeeded.  Walk past and close it.
#ifdef DEBUG
		cout << "Path_walking_actor_action::open_door()" << endl;
#endif
		signed char frames[2];
		frames[0] = actor->get_dir_framenum(dir, Actor::standing);
		frames[1] = actor->get_dir_framenum(dir, Actor::ready_frame);
		signed char standframe = frames[0];
		set_subseq(create_action_sequence(actor, past,
		                                  new Sequence_actor_action(
		                                      new Frames_actor_action(frames,
		                                              sizeof(frames)),
		                                      new Activate_actor_action(door),
		                                      new Frames_actor_action(&standframe, 1))));
		return 1;
	}
	return 0;
}

/**
 *  Stopped moving.
 */

void Path_walking_actor_action::stop(
    Actor *actor
) {
	// Don't set slimes.
	if (!actor->get_info().has_strange_movement() && actor->can_act()) {
		// ++++For now, just use original dir.
		Frames_sequence *frames = actor->get_frames(original_dir);
		actor->change_frame(frames->get_resting());
	}
}

/**
 *  Set to walk from one point to another, using the same pathfinder.
 *
 *  @return     this, or 0 if unsuccessful.
 */

Actor_action *Path_walking_actor_action::walk_to_tile(
    Actor *npc,
    Tile_coord const &src,      // tx=-1 or ty=-1 means don't care.
    Tile_coord const &dest,     // Same here.
    int dist,           // Distance to get to within dest.
    bool ignnpc         // If pathfinder should ignore NPCs in many cases.
) {
	blocked = 0;            // Clear 'blocked' count.
	reached_end = false;        // Starting new path.
	get_party = false;
	from_offscreen = false;
	//+++++Should dist be used below??:
	// Set up new path.
	// Don't care about 1 coord.?
	if (dest.tx == -1 || dest.ty == -1) {
		if (dest.tx == dest.ty) { // Completely off-screen?
			Offscreen_pathfinder_client cost(npc, ignnpc);
			if (!path->NewPath(src, dest, &cost))
				return 0;
		} else {
			Onecoord_pathfinder_client cost(npc, ignnpc);
			if (!path->NewPath(src, dest, &cost))
				return 0;
		}
	}
	// How about from source?
	else if (src.tx == -1 || src.ty == -1) {
		// Figure path in opposite dir.
		if (src.tx == src.ty) { // Both -1?
			// Aim from NPC's current pos.
			Offscreen_pathfinder_client cost(npc, npc->get_tile(), ignnpc);
			if (!path->NewPath(dest, src, &cost))
				return 0;
		} else {
			Onecoord_pathfinder_client cost(npc, ignnpc);
			if (!path->NewPath(dest, src, &cost))
				return 0;
		}
		from_offscreen = true;
		// Set to go backwards.
		if (!path->set_backwards())
			return 0;
	} else {
		Actor_pathfinder_client cost(npc, dist, ignnpc);
		if (!path->NewPath(src, dest, &cost))
			return 0;
	}
	// Reset direction (but not index).
	original_dir = static_cast<int>(Get_direction4(
	                                    src.ty - dest.ty, dest.tx - src.tx));
	return this;
}

/**
 *  Return current destination.
 *
 *  @return     0 if none.
 */

int Path_walking_actor_action::get_dest(
    Tile_coord &dest        // Returned here.
) const {
	dest = path->get_dest();
	return 1;
}

/**
 *  Following an Astar path?
 */

int Path_walking_actor_action::following_smart_path(
) const {
	return path != 0 && path->following_smart_path();
}

/**
 *  Create action to follow a path towards another object.
 */

Approach_actor_action::Approach_actor_action(
    PathFinder *p,          // Path to follow.
    Game_object *d,         // Destination object.
    int gdist,          // Stop when this close to dest.
    bool for_proj           // Check for projectile path.
) : Path_walking_actor_action(p, 0),    // (Stop if blocked.)
	dest_obj(d), goal_dist(gdist), orig_dest_pos(d->get_tile()), cur_step(0),
	for_projectile(for_proj) {
	// Get length of path.
	int nsteps = path->get_num_steps();
	//cout << "Approach nsteps is " << nsteps << "." << endl;
	if (nsteps >= 6)        // (May have to play with this).
		check_step = nsteps > 18 ? 9 : nsteps / 2;
	else
		check_step = 10000;
}

/**
 *  Create action for walking towards a given (moving) object using Astar.
 *  Note:  This is a static method.
 *
 *  @return     Action if successful, else 0.
 */

Approach_actor_action *Approach_actor_action::create_path(
    Tile_coord const &src,  // Starting position.
    Game_object *dest,      // Destination.
    int gdist,          // Stop when this close to dest.
    Pathfinder_client &cost     // Cost for Astar.
) {
	Astar *path = new Astar();
	// Get to within 1 tile.
	if (path->NewPath(src, dest->get_tile(), &cost))
		return new Approach_actor_action(path, dest, gdist);
	else {
		delete path;
		return 0;
	}
}

/**
 *  Handle a time event.
 *
 *  @return     0 if done with this action, else delay for next frame.
 */

int Approach_actor_action::handle_event(
    Actor *actor
) {
	int delay = Path_walking_actor_action::handle_event(actor);
	if (!delay || deleted)          // Done or blocked.
		return 0;
	// Close enough?
	if (goal_dist >= 0 && actor->distance(dest_obj) <= goal_dist)
		return 0;
	if (++cur_step == check_step) { // Time to check.
#ifdef DEBUG
		cout << actor->get_name() <<
		     " approach: Dist. to dest is " <<
		     actor->distance(dest_obj) <<
		     endl;
#endif
		if (dest_obj->distance(orig_dest_pos) > 2)
			return 0;   // Moved too much, so stop.
		if (for_projectile &&
		        Fast_pathfinder_client::is_straight_path(actor, dest_obj))
			return 0;   // Can fire projectile.
		// Figure next check.
		int nsteps = path->get_num_steps();
		if (nsteps >= 6)
			// Try checking more often.
			check_step += 3;
	}
	return delay;
}

/**
 *  Create if-then-else path.
 */

If_else_path_actor_action::If_else_path_actor_action(
    Actor *actor,
    Tile_coord const &dest,
    Actor_action *s,
    Actor_action *f
) : Path_walking_actor_action(0, 6),    // Maxblk = 6.
	succeeded(false), failed(false), done(false),
	success(s), failure(f) {
	if (!walk_to_tile(actor, actor->get_tile(), dest)) {
		done = failed = true;
	}
}

/**
 *  Delete.
 */

If_else_path_actor_action::~If_else_path_actor_action(
) {
	delete success;
	delete failure;
}

/**
 *  Set failure action.
 */

void If_else_path_actor_action::set_failure(
    Actor_action *f
) {
	delete failure;
	failure = f;
	done = false;           // So it gets executed.
}

/**
 *  Handle a time event.
 *
 *  @return     0 if done with this action, else delay for next frame.
 */

int If_else_path_actor_action::handle_event(
    Actor *actor
) {
	if (done)
		return 0;       // Shouldn't really get here.
	bool del;
	int delay;
	if (succeeded) {        // Doing the success action?
		if ((delay = success->handle_event_safely(actor, del)) == 0 &&
		        !del)
			done = true;
		return delay;
	} else if (failed) {
		if ((delay = failure->handle_event_safely(actor, del)) == 0 &&
		        !del)
			done = true;
		return delay;
	}
	delay = Path_walking_actor_action::handle_event(actor);
	if (delay)
		return delay;
	if (deleted)
		return 0;
	if (!reached_end) {
		// Didn't get there.
		if (failure) {
			failed = true;
#if DEBUG
			cout << "Executing 'failure' path usecode" << endl;
#endif
			delay = failure->handle_event_safely(actor, del);
			if (del)    // Are we gone?
				return 0;
		}
	} else {            // Success.
		if (success) {
			succeeded = true;
			delay = success->handle_event_safely(actor, del);
			if (del)    // Are we gone?
				return 0;
		}
	}
	if (!delay)
		done = true;        // All done now.
	return delay;
}

/**
 *  Handle a time event.
 *
 *  @return     0 if done with this action, else delay for next frame.
 */

int Move_actor_action::handle_event(
    Actor *actor
) {
	if (dest.tx < 0 || actor->get_tile() == dest)
		return 0;       // Done.
	actor->move(dest);      // Zip right there.
	Game_window *gwin = Game_window::get_instance();
	if (actor == gwin->get_main_actor())
		// Teleported Avatar?
		gwin->center_view(dest);
	dest.tx = -1;           // Set to stop.
	return 100;         // Wait 1/10 sec.
}

/**
 *  Handle a time event.
 *
 *  @return     0 if done with this action, else delay for next frame.
 */

int Activate_actor_action::handle_event(
    Actor *actor
) {
	ignore_unused_variable_warning(actor);
	obj->activate();
	return 0;           // That's all.
}

/**
 *  Handle a time event.
 *
 *  @return     0 if done with this action, else delay for next frame.
 */

int Usecode_actor_action::handle_event(
    Actor *actor
) {
	ignore_unused_variable_warning(actor);
	Game_window *gwin = Game_window::get_instance();
	gwin->get_usecode()->call_usecode(fun, item,
	                                  static_cast<Usecode_machine::Usecode_events>(eventid));
	gwin->set_all_dirty();      // Clean up screen.
	return 0;           // That's all.
}

/**
 *  Create sequence of frames.
 */

Frames_actor_action::Frames_actor_action(
    signed char *f,         // Frames.  -1 means don't change.
    int c,              // Count.
    int spd,            // Frame delay in 1/1000 secs.
    Game_object *o
) : cnt(c), index(0), speed(spd), obj(o) {
	frames = new signed char[cnt];
	std::memcpy(frames, f, cnt);
}

/**
 *  Create sequence of frames.
 */

Frames_actor_action::Frames_actor_action(
    char f,             // Frames.  -1 means don't change.
    int spd,            // Frame delay in 1/1000 secs.
    Game_object *o
) : cnt(1), index(0), speed(spd), obj(o) {
	frames = new signed char[1];
	frames[0] = f;
}

/**
 *  Handle a time event.
 *
 *  @return     0 if done with this action, else delay for next frame.
 */

int Frames_actor_action::handle_event(
    Actor *actor
) {
	Game_object *o = obj;
	if (index == cnt)
		return 0;       // Done.
	int frnum = frames[index++];    // Get frame.
	if (frnum >= 0) {
		if (o)
			o->change_frame(frnum);
		else
			actor->change_frame(frnum);
	}
	return speed;
}

/**
 *  Create a sequence with up to 4 actions.
 */

Sequence_actor_action::Sequence_actor_action(
    Actor_action *a0,       // (These will be deleted when done.)
    Actor_action *a1,
    Actor_action *a2,
    Actor_action *a3
) : index(0), speed(100) {
	actions = new Actor_action *[5];// Create list.
	actions[0] = a0;
	actions[1] = a1;
	actions[2] = a2;
	actions[3] = a3;
	actions[4] = 0;         // 0-delimit.
}

/**
 *  Delete.
 */

Sequence_actor_action::~Sequence_actor_action(
) {
	for (int i = 0; actions[i]; i++)
		delete actions[i];
	delete [] actions;
}

/**
 *  Handle a time event.
 *
 *  @return     0 if done with this action, else delay for next frame.
 */

int Sequence_actor_action::handle_event(
    Actor *actor
) {
	if (!actions[index])        // Done?
		return 0;
	// Do current action.
	bool deleted;
	int delay = actions[index]->handle_event_safely(actor, deleted);
	if (deleted)
		return 0;       // We've been deleted!
	if (!delay) {
		index++;        // That one's done now.
		if (!speed)     // Immediately?  Run with next.
			return handle_event(actor);
		delay = speed;
	}
	return delay;
}

/**
 *  Create object animator.
 */
Object_animate_actor_action::Object_animate_actor_action(
    Game_object *o,
    int cy,             // # of cycles.
    int spd             // Time between frames.
) : obj(o), cycles(cy), speed(spd) {
	nframes = obj->get_num_frames();
}

Object_animate_actor_action::Object_animate_actor_action(
    Game_object *o,
    int nfr,
    int cy,
    int spd
) : obj(o), nframes(nfr), cycles(cy), speed(spd)
{ }


/**
 *  Handle tick of the clock.
 */

int Object_animate_actor_action::handle_event(
    Actor *actor
) {
	ignore_unused_variable_warning(actor);
	if (!cycles) return 0;
	int frnum = (obj->get_framenum() + 1) % nframes;
	if (!frnum)         // New cycle?
		--cycles;
	obj->change_frame(frnum);
	return cycles ? speed : 0;
}

/**
 *  Pick up/put down an object.
 */
Pickup_actor_action::Pickup_actor_action(Game_object *o, int spd)
	: obj(o), pickup(1), speed(spd), cnt(0),
	  objpos(obj->get_tile()), dir(0) {
}
// To put down an object:
Pickup_actor_action::Pickup_actor_action(Game_object *o, Tile_coord const &opos,
        int spd, bool t)
	: obj(o), pickup(0), speed(spd), cnt(0), objpos(opos), dir(0), temp(t) {
}

/**
 *  Pick up an item (or put it down).
 */

int Pickup_actor_action::handle_event(
    Actor *actor
) {
	Game_window *gwin = Game_window::get_instance();
	int frnum = -1;
	switch (cnt) {
	case 0:             // Face object.
		dir = actor->get_direction(objpos);
		frnum = actor->get_dir_framenum(dir, Actor::standing);
		cnt++;
		break;
	case 1: {            // Bend down.
		int tz = pickup ? obj->get_lift() : objpos.tz;
		frnum = (tz >= actor->get_lift() + 2) ?
			  ((rand()%2) ? Actor::reach1_frame : Actor::reach2_frame) :
			  Actor::bow_frame;
		frnum = actor->get_dir_framenum(dir, frnum);
		cnt++;
		if (pickup) {
			if (actor->distance(obj) > 8) {
				// No longer nearby.
				actor->notify_object_gone(obj);
				break;
			}
			gwin->add_dirty(obj);
			obj->remove_this(1);
			actor->add(obj, true);
		} else {
			obj->remove_this(1);
			obj->move(objpos);
			if (temp)
				obj->set_flag(Obj_flags::is_temporary);
			gwin->add_dirty(obj);
		}
		}
		break;
	case 2:
		frnum = actor->get_dir_framenum(dir, Actor::standing);
		cnt++;
		break;
	default:
		return 0;       // Done.
	}
	actor->change_frame(frnum);
	return speed;
}

/**
 *  Action to turn towards a position or an object.
 */

Face_pos_actor_action::Face_pos_actor_action(Tile_coord const &p, int spd)
	: speed(spd), pos(p) {
}
Face_pos_actor_action::Face_pos_actor_action(Game_object *o, int spd)
	: speed(spd),
	  pos(o->get_tile()) {
}

/**
 *  Just turn to face a tile.
 */

int Face_pos_actor_action::handle_event(
    Actor *actor
) {
	int dir = actor->get_direction(pos);
	int frnum = actor->get_dir_framenum(dir, Actor::standing);
	if (actor->get_framenum() == frnum)
		return 0;       // There.
	actor->change_frame(frnum);
	return speed;
}

/**
 *  Action to change the shape, frame and quality of an object.
 */

Change_actor_action::Change_actor_action(
    Game_object *o,
    int sh,
    int fr,
    int ql
) : obj(o), shnum(sh), frnum(fr), qual(ql) {
}

/**
 *  Just change the object.
 */

int Change_actor_action::handle_event(
    Actor *actor
) {
	ignore_unused_variable_warning(actor);
	Game_window *gwin = Game_window::get_instance();
	gwin->add_dirty(obj);
	obj->set_shape(shnum, frnum);
	obj->set_quality(qual);
	gwin->add_dirty(obj);
	return 0;
}