/
monmove.cpp
2142 lines (1924 loc) · 76.2 KB
/
monmove.cpp
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// Monster movement code; essentially, the AI
#include <algorithm>
#include <cfloat>
#include <cmath>
#include <cstdlib>
#include <iterator>
#include <list>
#include <memory>
#include <ostream>
#include <unordered_map>
#include "behavior.h"
#include "bionics.h"
#include "cached_options.h"
#include "cata_utility.h"
#include "character.h"
#include "creature_tracker.h"
#include "debug.h"
#include "field.h"
#include "field_type.h"
#include "game.h"
#include "game_constants.h"
#include "int_id.h"
#include "line.h"
#include "make_static.h"
#include "map.h"
#include "map_iterator.h"
#include "mapdata.h"
#include "mattack_common.h"
#include "messages.h"
#include "monfaction.h"
#include "monster.h" // IWYU pragma: associated
#include "monster_oracle.h"
#include "mtype.h"
#include "npc.h"
#include "pathfinding.h"
#include "pimpl.h"
#include "player.h"
#include "rng.h"
#include "scent_map.h"
#include "sounds.h"
#include "string_formatter.h"
#include "string_id.h"
#include "tileray.h"
#include "translations.h"
#include "trap.h"
#include "units.h"
#include "vehicle.h"
#include "viewer.h"
#include "vpart_position.h"
static const efftype_id effect_bouldering( "bouldering" );
static const efftype_id effect_countdown( "countdown" );
static const efftype_id effect_docile( "docile" );
static const efftype_id effect_downed( "downed" );
static const efftype_id effect_dragging( "dragging" );
static const efftype_id effect_grabbed( "grabbed" );
static const efftype_id effect_harnessed( "harnessed" );
static const efftype_id effect_no_sight( "no_sight" );
static const efftype_id effect_operating( "operating" );
static const efftype_id effect_pacified( "pacified" );
static const efftype_id effect_pushed( "pushed" );
static const efftype_id effect_stunned( "stunned" );
static const itype_id itype_pressurized_tank( "pressurized_tank" );
static const species_id species_FUNGUS( "FUNGUS" );
static const species_id species_INSECT( "INSECT" );
static const species_id species_SPIDER( "SPIDER" );
static const species_id species_ZOMBIE( "ZOMBIE" );
static const std::string flag_AUTODOC_COUCH( "AUTODOC_COUCH" );
static const std::string flag_LIQUID( "LIQUID" );
static constexpr int MONSTER_FOLLOW_DIST = 8;
bool monster::wander()
{
return ( goal == pos() );
}
bool monster::is_immune_field( const field_type_id &fid ) const
{
if( fid == fd_fungal_haze ) {
return has_flag( MF_NO_BREATHE ) || type->in_species( species_FUNGUS );
}
if( fid == fd_fungicidal_gas ) {
return !type->in_species( species_FUNGUS );
}
if( fid == fd_insecticidal_gas ) {
return !type->in_species( species_INSECT ) && !type->in_species( species_SPIDER );
}
const field_type &ft = fid.obj();
if( ft.has_fume ) {
return has_flag( MF_NO_BREATHE );
}
if( ft.has_acid ) {
return has_flag( MF_ACIDPROOF ) || flies();
}
if( ft.has_fire ) {
return has_flag( MF_FIREPROOF );
}
if( ft.has_elec ) {
return has_flag( MF_ELECTRIC );
}
if( ft.immune_mtypes.count( type->id ) > 0 ) {
return true;
}
// No specific immunity was found, so fall upwards
return Creature::is_immune_field( fid );
}
static bool z_is_valid( int z )
{
return z >= -OVERMAP_DEPTH && z <= OVERMAP_HEIGHT;
}
bool monster::will_move_to( const tripoint &p ) const
{
map &here = get_map();
if( here.impassable( p ) ) {
if( digging() ) {
if( !here.has_flag( "BURROWABLE", p ) ) {
return false;
}
} else if( !( can_climb() && here.has_flag( "CLIMBABLE", p ) ) ) {
return false;
}
}
if( ( !can_submerge() && !flies() ) && here.has_flag( TFLAG_DEEP_WATER, p ) ) {
return false;
}
if( digs() && !here.has_flag( "DIGGABLE", p ) && !here.has_flag( "BURROWABLE", p ) ) {
return false;
}
if( has_flag( MF_AQUATIC ) && !here.has_flag( "SWIMMABLE", p ) ) {
return false;
}
if( has_flag( MF_SUNDEATH ) && g->is_in_sunlight( p ) ) {
return false;
}
if( get_size() > creature_size::medium && here.has_flag_ter( TFLAG_SMALL_PASSAGE, p ) ) {
return false; // if a large critter, can't move through tight passages
}
// Various avoiding behaviors.
bool avoid_fire = has_flag( MF_AVOID_FIRE );
bool avoid_fall = has_flag( MF_AVOID_FALL );
bool avoid_simple = has_flag( MF_AVOID_DANGER_1 );
bool avoid_complex = has_flag( MF_AVOID_DANGER_2 );
/*
* Because some avoidance behaviors are supersets of others,
* we can cascade through the implications. Complex implies simple,
* and simple implies fire and fall.
* unfortunately, fall does not necessarily imply fire, nor the converse.
*/
if( avoid_complex ) {
avoid_simple = true;
}
if( avoid_simple ) {
avoid_fire = true;
avoid_fall = true;
}
// technically this will shortcut in evaluation from fire or fall
// before hitting simple or complex but this is more explicit
if( avoid_fire || avoid_fall || avoid_simple || avoid_complex ) {
const ter_id target = here.ter( p );
// Don't enter lava if we have any concept of heat being bad
if( avoid_fire && target == t_lava ) {
return false;
}
if( avoid_fall ) {
// Don't throw ourselves off cliffs if we have a concept of falling
if( !here.has_floor( p ) && !flies() ) {
return false;
}
// Don't enter open pits ever unless tiny, can fly or climb well
if( !( type->size == creature_size::tiny || can_climb() ) &&
( target == t_pit || target == t_pit_spiked || target == t_pit_glass ) ) {
return false;
}
}
// Some things are only avoided if we're not attacking
if( attitude( &get_player_character() ) != MATT_ATTACK ) {
// Sharp terrain is ignored while attacking
if( avoid_simple && here.has_flag( "SHARP", p ) &&
!( type->size == creature_size::tiny || flies() ) ) {
return false;
}
}
const field &target_field = here.field_at( p );
// Higher awareness is needed for identifying these as threats.
if( avoid_complex ) {
// Don't enter any dangerous fields
if( is_dangerous_fields( target_field ) ) {
return false;
}
// Don't step on any traps (if we can see)
const trap &target_trap = here.tr_at( p );
if( has_flag( MF_SEES ) && !target_trap.is_benign() && here.has_floor( p ) ) {
return false;
}
}
// Without avoid_complex, only fire and electricity are checked for field avoidance.
if( avoid_fire && target_field.find_field( fd_fire ) ) {
return false;
}
if( avoid_simple && target_field.find_field( fd_electricity ) ) {
return false;
}
}
return true;
}
bool monster::can_reach_to( const tripoint &p ) const
{
map &here = get_map();
if( p.z > pos().z && z_is_valid( pos().z ) ) {
if( here.has_flag( TFLAG_RAMP_UP, tripoint( p.xy(), p.z - 1 ) ) ) {
return true;
}
if( !here.has_flag( TFLAG_GOES_UP, pos() ) && !here.has_flag( TFLAG_NO_FLOOR, p ) ) {
// can't go through the roof
return false;
}
} else if( p.z < pos().z && z_is_valid( pos().z ) ) {
if( !here.has_flag( TFLAG_GOES_DOWN, pos() ) ) {
// can't go through the floor
// you would fall anyway if there was no floor, so no need to check for that here
return false;
}
}
return true;
}
bool monster::can_move_to( const tripoint &p ) const
{
return can_reach_to( p ) && will_move_to( p );
}
void monster::set_dest( const tripoint &p )
{
goal = p;
}
void monster::unset_dest()
{
goal = pos();
path.clear();
}
// Move towards p for f more turns--generally if we hear a sound there
// "Stupid" movement; "if (wander_pos.x < posx) posx--;" etc.
void monster::wander_to( const tripoint &p, int f )
{
wander_pos = p;
wandf = f;
}
float monster::rate_target( Creature &c, float best, bool smart ) const
{
const FastDistanceApproximation d = rl_dist_fast( pos(), c.pos() );
if( d <= 0 ) {
return FLT_MAX;
}
// Check a very common and cheap case first
if( !smart && d >= best ) {
return FLT_MAX;
}
if( !sees( c ) ) {
return FLT_MAX;
}
if( !smart ) {
return static_cast<int>( d );
}
float power = c.power_rating();
monster *mon = dynamic_cast< monster * >( &c );
// Their attitude to us and not ours to them, so that bobcats won't get gunned down
if( mon != nullptr && mon->attitude_to( *this ) == Attitude::HOSTILE ) {
power += 2;
}
if( power > 0 ) {
return static_cast<int>( d ) / power;
}
return FLT_MAX;
}
void monster::plan()
{
const auto &factions = g->critter_tracker->factions();
// Bots are more intelligent than most living stuff
bool smart_planning = has_flag( MF_PRIORITIZE_TARGETS );
Creature *target = nullptr;
int max_sight_range = std::max( type->vision_day, type->vision_night );
// 8.6f is rating for tank drone 60 tiles away, moose 16 or boomer 33
float dist = !smart_planning ? max_sight_range : 8.6f;
bool fleeing = false;
bool docile = friendly != 0 && has_effect( effect_docile );
const bool angers_hostile_weak = type->has_anger_trigger( mon_trigger::HOSTILE_WEAK );
const int angers_hostile_near = type->has_anger_trigger( mon_trigger::HOSTILE_CLOSE ) ? 5 : 0;
const int angers_mating_season = type->has_anger_trigger( mon_trigger::MATING_SEASON ) ? 3 : 0;
const int angers_cub_threatened = type->has_anger_trigger( mon_trigger::PLAYER_NEAR_BABY ) ? 8 : 0;
const int fears_hostile_near = type->has_fear_trigger( mon_trigger::HOSTILE_CLOSE ) ? 5 : 0;
map &here = get_map();
std::bitset<OVERMAP_LAYERS> seen_levels = here.get_inter_level_visibility( pos().z );
bool group_morale = has_flag( MF_GROUP_MORALE ) && morale < type->morale;
bool swarms = has_flag( MF_SWARMS );
monster_attitude mood = attitude();
Character &player_character = get_player_character();
// If we can see the player, move toward them or flee, simpleminded animals are too dumb to follow the player.
if( friendly == 0 && seen_levels.test( player_character.pos().z + OVERMAP_DEPTH ) &&
sees( player_character ) && !has_flag( MF_PET_WONT_FOLLOW ) ) {
dist = rate_target( player_character, dist, smart_planning );
fleeing = fleeing || is_fleeing( player_character );
target = &player_character;
if( dist <= 5 ) {
anger += angers_hostile_near;
morale -= fears_hostile_near;
if( angers_mating_season > 0 ) {
bool mating_angry = false;
season_type season = season_of_year( calendar::turn );
for( const std::string &elem : type->baby_flags ) {
if( ( season == SUMMER && elem == "SUMMER" ) ||
( season == WINTER && elem == "WINTER" ) ||
( season == SPRING && elem == "SPRING" ) ||
( season == AUTUMN && elem == "AUTUMN" ) ) {
mating_angry = true;
break;
}
}
if( mating_angry ) {
anger += angers_mating_season;
}
}
}
if( angers_cub_threatened > 0 ) {
for( monster &tmp : g->all_monsters() ) {
if( type->baby_monster == tmp.type->id ) {
// baby nearby; is the player too close?
dist = tmp.rate_target( player_character, dist, smart_planning );
if( dist <= 3 ) {
//proximity to baby; monster gets furious and less likely to flee
anger += angers_cub_threatened;
morale += angers_cub_threatened / 2;
}
}
}
}
} else if( friendly != 0 && !docile ) {
for( monster &tmp : g->all_monsters() ) {
if( tmp.friendly == 0 && seen_levels.test( tmp.pos().z + OVERMAP_DEPTH ) ) {
float rating = rate_target( tmp, dist, smart_planning );
if( rating < dist ) {
target = &tmp;
dist = rating;
}
}
}
}
if( docile ) {
if( friendly != 0 && target != nullptr ) {
set_dest( target->pos() );
}
return;
}
int valid_targets = ( target == nullptr ) ? 1 : 0;
for( npc &who : g->all_npcs() ) {
mf_attitude faction_att = faction.obj().attitude( who.get_monster_faction() );
if( faction_att == MFA_NEUTRAL || faction_att == MFA_FRIENDLY ) {
continue;
}
if( !seen_levels.test( who.pos().z + OVERMAP_DEPTH ) ) {
continue;
}
float rating = rate_target( who, dist, smart_planning );
bool fleeing_from = is_fleeing( who );
if( rating == dist && ( fleeing || attitude( &who ) == MATT_ATTACK ) ) {
++valid_targets;
if( one_in( valid_targets ) ) {
target = &who;
}
}
// Switch targets if closer and hostile or scarier than current target
if( ( rating < dist && fleeing ) ||
( faction_att == MFA_HATE ) ||
( rating < dist && attitude( &who ) == MATT_ATTACK ) ||
( !fleeing && fleeing_from ) ) {
target = &who;
dist = rating;
valid_targets = 1;
}
fleeing = fleeing || fleeing_from;
if( rating <= 5 ) {
anger += angers_hostile_near;
morale -= fears_hostile_near;
if( angers_mating_season > 0 ) {
bool mating_angry = false;
season_type season = season_of_year( calendar::turn );
for( const std::string &elem : type->baby_flags ) {
if( ( season == SUMMER && elem == "SUMMER" ) ||
( season == WINTER && elem == "WINTER" ) ||
( season == SPRING && elem == "SPRING" ) ||
( season == AUTUMN && elem == "AUTUMN" ) ) {
mating_angry = true;
break;
}
}
if( mating_angry ) {
anger += angers_mating_season;
}
}
}
}
fleeing = fleeing || ( mood == MATT_FLEE );
// Throttle monster thinking, if there are no apparent threats, stop paying attention.
constexpr int max_turns_for_rate_limiting = 1800;
constexpr double max_turns_to_skip = 600.0;
// Outputs a range from 0.0 - 1.0.
int rate_limiting_factor = 1.0 - logarithmic_range( 0, max_turns_for_rate_limiting,
turns_since_target );
int turns_to_skip = max_turns_to_skip * rate_limiting_factor;
if( friendly == 0 && ( turns_to_skip == 0 || turns_since_target % turns_to_skip == 0 ) ) {
for( const auto &fac_list : factions ) {
mf_attitude faction_att = faction.obj().attitude( fac_list.first );
if( faction_att == MFA_NEUTRAL || faction_att == MFA_FRIENDLY ) {
continue;
}
for( const auto &fac : fac_list.second ) {
if( !seen_levels.test( fac.first + OVERMAP_DEPTH ) ) {
continue;
}
for( const weak_ptr_fast<monster> &weak : fac.second ) {
const shared_ptr_fast<monster> shared = weak.lock();
if( !shared ) {
continue;
}
monster &mon = *shared;
float rating = rate_target( mon, dist, smart_planning );
if( rating == dist ) {
++valid_targets;
if( one_in( valid_targets ) ) {
target = &mon;
}
}
if( rating < dist ) {
target = &mon;
dist = rating;
valid_targets = 1;
}
if( rating <= 5 ) {
anger += angers_hostile_near;
morale -= fears_hostile_near;
}
}
}
}
}
if( target == nullptr ) {
// Just avoiding overflow.
turns_since_target = std::min( turns_since_target + 1, max_turns_for_rate_limiting );
} else {
turns_since_target = 0;
}
// Friendly monsters here
// Avoid for hordes of same-faction stuff or it could get expensive
const auto actual_faction = friendly == 0 ? faction : STATIC( mfaction_str_id( "player" ) );
const auto &myfaction_iter = factions.find( actual_faction );
if( myfaction_iter == factions.end() ) {
DebugLog( D_ERROR, D_GAME ) << disp_name() << " tried to find faction "
<< actual_faction.id().str()
<< " which wasn't loaded in game::monmove";
swarms = false;
group_morale = false;
}
swarms = swarms && target == nullptr; // Only swarm if we have no target
if( group_morale || swarms ) {
for( const auto &fac : myfaction_iter->second ) {
if( !seen_levels.test( fac.first + OVERMAP_DEPTH ) ) {
continue;
}
for( const weak_ptr_fast<monster> &weak : fac.second ) {
const shared_ptr_fast<monster> shared = weak.lock();
if( !shared ) {
continue;
}
monster &mon = *shared;
float rating = rate_target( mon, dist, smart_planning );
if( group_morale && rating <= 10 ) {
morale += 10 - rating;
}
if( swarms ) {
if( rating < 5 ) { // Too crowded here
wander_pos.x = posx() * rng( 1, 3 ) - mon.posx();
wander_pos.y = posy() * rng( 1, 3 ) - mon.posy();
wandf = 2;
target = nullptr;
// Swarm to the furthest ally you can see
} else if( rating < FLT_MAX && rating > dist && wandf <= 0 ) {
target = &mon;
dist = rating;
}
}
}
}
}
// Operating monster keep you safe while they operate, how nice....
if( type->has_special_attack( "OPERATE" ) ) {
if( has_effect( effect_operating ) ) {
friendly = 100;
for( Creature *critter : here.get_creatures_in_radius( pos(), 6 ) ) {
monster *mon = dynamic_cast<monster *>( critter );
if( mon != nullptr && mon->type->in_species( species_ZOMBIE ) ) {
anger = 100;
} else {
anger = 0;
}
}
}
}
if( has_effect( effect_dragging ) ) {
if( type->has_special_attack( "OPERATE" ) ) {
bool found_path_to_couch = false;
tripoint tmp( pos() + point( 12, 12 ) );
tripoint couch_loc;
for( const auto &couch_pos : here.find_furnitures_with_flag_in_radius( pos(), 10,
flag_AUTODOC_COUCH ) ) {
if( here.clear_path( pos(), couch_pos, 10, 0, 100 ) ) {
if( rl_dist( pos(), couch_pos ) < rl_dist( pos(), tmp ) ) {
tmp = couch_pos;
found_path_to_couch = true;
couch_loc = couch_pos;
}
}
}
if( !found_path_to_couch ) {
anger = 0;
remove_effect( effect_dragging );
} else {
set_dest( couch_loc );
}
}
} else if( target != nullptr ) {
tripoint dest = target->pos();
Creature::Attitude att_to_target = attitude_to( *target );
if( att_to_target == Attitude::HOSTILE && !fleeing ) {
set_dest( dest );
} else if( fleeing ) {
set_dest( tripoint( posx() * 2 - dest.x, posy() * 2 - dest.y, posz() ) );
}
if( angers_hostile_weak && att_to_target != Attitude::FRIENDLY ) {
int hp_per = target->hp_percentage();
if( hp_per <= 70 ) {
anger += 10 - static_cast<int>( hp_per / 10 );
}
}
} else if( friendly > 0 && one_in( 3 ) ) {
// Grow restless with no targets
friendly--;
} else if( friendly < 0 && sees( player_character ) ) {
if( rl_dist( pos(), player_character.pos() ) > 2 ) {
set_dest( player_character.pos() );
} else {
unset_dest();
}
}
}
/**
* Method to make monster movement speed consistent in the face of staggering behavior and
* differing distance metrics.
* It works by scaling the cost to take a step by
* how much that step reduces the distance to your goal.
* Since it incorporates the current distance metric,
* it also scales for diagonal vs orthogonal movement.
**/
static float get_stagger_adjust( const tripoint &source, const tripoint &destination,
const tripoint &next_step )
{
// TODO: push this down into rl_dist
const float initial_dist =
trigdist ? trig_dist( source, destination ) : rl_dist( source, destination );
const float new_dist =
trigdist ? trig_dist( next_step, destination ) : rl_dist( next_step, destination );
// If we return 0, it wil cancel the action.
return std::max( 0.01f, initial_dist - new_dist );
}
/**
* Returns true if the given square presents a possibility of drowning for the monster: it's deep water, it's liquid,
* the monster can drown, and there is no boardable vehicle part present.
*/
bool monster::is_aquatic_danger( const tripoint &at_pos )
{
map &here = get_map();
return here.has_flag_ter( TFLAG_DEEP_WATER, at_pos ) && here.has_flag( flag_LIQUID, at_pos ) &&
can_drown() && !here.veh_at( at_pos ).part_with_feature( "BOARDABLE", false );
}
bool monster::die_if_drowning( const tripoint &at_pos, const int chance )
{
if( is_aquatic_danger( at_pos ) && one_in( chance ) ) {
die( nullptr );
add_msg_if_player_sees( at_pos, _( "The %s drowns!" ), name() );
return true;
}
return false;
}
// General movement.
// Currently, priority goes:
// 1) Special Attack
// 2) Sight-based tracking
// 3) Scent-based tracking
// 4) Sound-based tracking
void monster::move()
{
// We decrement wandf no matter what. We'll save our wander_to plans until
// after we finish out set_dest plans, UNLESS they time out first.
if( wandf > 0 ) {
wandf--;
}
//Hallucinations have a chance of disappearing each turn
if( is_hallucination() && one_in( 25 ) ) {
die( nullptr );
return;
}
map &here = get_map();
Character &player_character = get_player_character();
behavior::monster_oracle_t oracle( this );
behavior::tree goals;
goals.add( type->get_goals() );
std::string action = goals.tick( &oracle );
//The monster can consume objects it stands on. Check if there are any.
//If there are. Consume them.
// TODO: Stick this in a map and dispatch to it via the action string.
if( action == "consume_items" ) {
add_msg_if_player_sees( *this,
_( "The %s flows around the objects on the floor and they are quickly dissolved!" ),
name() );
static const auto volume_per_hp = 250_ml;
for( item &elem : here.i_at( pos() ) ) {
hp += elem.volume() / volume_per_hp; // Yeah this means it can get more HP than normal.
if( has_flag( MF_ABSORBS_SPLITS ) ) {
while( hp / 2 > type->hp ) {
monster *const spawn = g->place_critter_around( type->id, pos(), 1 );
if( !spawn ) {
break;
}
hp -= type->hp;
//this is a new copy of the monster. Ideally we should copy the stats/effects that affect the parent
spawn->make_ally( *this );
add_msg_if_player_sees( *this, _( "The %s splits in two!" ), name() );
}
}
}
here.i_clear( pos() );
} else if( action == "eat_crop" ) {
// TODO: Create a special attacks whitelist unordered map instead of an if chain.
std::map<std::string, mtype_special_attack>::const_iterator attack =
type->special_attacks.find( action );
if( attack != type->special_attacks.end() && attack->second->call( *this ) ) {
if( special_attacks.count( action ) != 0 ) {
reset_special( action );
}
}
}
// record position before moving to put the player there if we're dragging
tripoint drag_to = here.getabs( pos() );
const bool pacified = has_effect( effect_pacified );
// First, use the special attack, if we can!
// The attack may change `monster::special_attacks` (e.g. by transforming
// this into another monster type). Therefore we can not iterate over it
// directly and instead iterate over the map from the monster type
// (properties of monster types should never change).
for( const auto &sp_type : type->special_attacks ) {
const std::string &special_name = sp_type.first;
const auto local_iter = special_attacks.find( special_name );
if( local_iter == special_attacks.end() ) {
continue;
}
mon_special_attack &local_attack_data = local_iter->second;
if( !local_attack_data.enabled ) {
continue;
}
// Cooldowns are decremented in monster::process_turn
if( local_attack_data.cooldown == 0 && !pacified && !is_hallucination() ) {
if( !sp_type.second->call( *this ) ) {
continue;
}
// `special_attacks` might have changed at this point. Sadly `reset_special`
// doesn't check the attack name, so we need to do it here.
if( special_attacks.count( special_name ) == 0 ) {
continue;
}
reset_special( special_name );
}
}
// Check if they're dragging a foe and find their hapless victim
player *dragged_foe = find_dragged_foe();
// Give nursebots a chance to do surgery.
nursebot_operate( dragged_foe );
// The monster can sometimes hang in air due to last fall being blocked
if( !flies() && here.has_flag( TFLAG_NO_FLOOR, pos() ) ) {
here.creature_on_trap( *this, false );
if( is_dead() ) {
return;
}
}
// if the monster is in a deep water tile, it has a chance to drown
if( die_if_drowning( pos(), 10 ) ) {
return;
}
if( moves < 0 ) {
return;
}
// TODO: Move this to attack_at/move_to/etc. functions
bool attacking = false;
if( !move_effects( attacking ) ) {
moves = 0;
return;
}
if( has_flag( MF_IMMOBILE ) || has_flag( MF_RIDEABLE_MECH ) ) {
moves = 0;
return;
}
if( has_effect( effect_stunned ) ) {
stumble();
moves = 0;
return;
}
if( friendly > 0 ) {
--friendly;
}
// don't move if a passenger in a moving vehicle
optional_vpart_position vp = here.veh_at( pos() );
bool harness_part = static_cast<bool>( here.veh_at( pos() ).part_with_feature( "ANIMAL_CTRL",
true ) );
if( vp && vp->vehicle().is_moving() && vp->vehicle().get_pet( vp->part_index() ) ) {
moves = 0;
return;
// Don't move if harnessed, even if vehicle is stationary
} else if( vp && has_effect( effect_harnessed ) ) {
moves = 0;
return;
// If harnessed monster finds itself moved from the harness point, the harness probably broke!
} else if( !harness_part && has_effect( effect_harnessed ) ) {
remove_effect( effect_harnessed );
}
// Set attitude to attitude to our current target
monster_attitude current_attitude = attitude( nullptr );
if( !wander() ) {
if( goal == player_character.pos() ) {
current_attitude = attitude( &player_character );
} else {
for( const npc &guy : g->all_npcs() ) {
if( goal == guy.pos() ) {
current_attitude = attitude( &guy );
}
}
}
}
if( current_attitude == MATT_IGNORE ||
( current_attitude == MATT_FOLLOW && rl_dist( pos(), goal ) <= MONSTER_FOLLOW_DIST ) ) {
moves = 0;
stumble();
return;
}
bool moved = false;
tripoint destination;
bool try_to_move = false;
for( const tripoint &dest : here.points_in_radius( pos(), 1 ) ) {
if( dest != pos() ) {
if( can_move_to( dest ) &&
g->critter_at( dest, true ) == nullptr ) {
try_to_move = true;
break;
}
}
}
// If true, don't try to greedily avoid locally bad paths
bool pathed = false;
if( try_to_move ) {
if( !wander() ) {
while( !path.empty() && path.front() == pos() ) {
path.erase( path.begin() );
}
const auto &pf_settings = get_pathfinding_settings();
if( pf_settings.max_dist >= rl_dist( pos(), goal ) &&
( path.empty() || rl_dist( pos(), path.front() ) >= 2 || path.back() != goal ) ) {
// We need a new path
path = here.route( pos(), goal, pf_settings, get_path_avoid() );
}
// Try to respect old paths, even if we can't pathfind at the moment
if( !path.empty() && path.back() == goal ) {
destination = path.front();
moved = true;
pathed = true;
} else {
// Straight line forward, probably because we can't pathfind (well enough)
destination = goal;
moved = true;
}
}
}
if( !moved && has_flag( MF_SMELLS ) ) {
// No sight... or our plans are invalid (e.g. moving through a transparent, but
// solid, square of terrain). Fall back to smell if we have it.
unset_dest();
tripoint tmp = scent_move();
if( tmp.x != -1 ) {
destination = tmp;
moved = true;
}
}
if( wandf > 0 && !moved && friendly == 0 ) { // No LOS, no scent, so as a fall-back follow sound
unset_dest();
if( wander_pos != pos() ) {
destination = wander_pos;
moved = true;
}
}
if( !here.has_zlevels() ) {
// Otherwise weird things happen
destination.z = posz();
}
point new_d( destination.xy() - pos().xy() );
// toggle facing direction for sdl flip
if( !tile_iso ) {
if( new_d.x < 0 ) {
facing = FacingDirection::LEFT;
} else if( new_d.x > 0 ) {
facing = FacingDirection::RIGHT;
}
} else {
if( new_d.y <= 0 && new_d.x <= 0 ) {
facing = FacingDirection::LEFT;
}
if( new_d.x >= 0 && new_d.y >= 0 ) {
facing = FacingDirection::RIGHT;
}
}
tripoint next_step;
const bool can_open_doors = has_flag( MF_CAN_OPEN_DOORS );
const bool staggers = has_flag( MF_STUMBLES );
if( moved ) {
// Implement both avoiding obstacles and staggering.
moved = false;
float switch_chance = 0.0f;
const bool can_bash = bash_skill() > 0;
// This is a float and using trig_dist() because that Does the Right Thing(tm)
// in both circular and roguelike distance modes.
const float distance_to_target = trig_dist( pos(), destination );
for( tripoint &candidate : squares_closer_to( pos(), destination ) ) {
// rare scenario when monster is on the border of the map and it's goal is outside of the map
if( !here.inbounds( candidate ) ) {
continue;
}
bool via_ramp = false;
if( here.has_flag( TFLAG_RAMP_UP, candidate ) ) {
via_ramp = true;
candidate.z += 1;
} else if( here.has_flag( TFLAG_RAMP_DOWN, candidate ) ) {
via_ramp = true;
candidate.z -= 1;
}
tripoint candidate_abs = get_map().getabs( candidate );
if( candidate.z != posz() ) {
bool can_z_move = true;
if( !here.valid_move( pos(), candidate, false, true, via_ramp ) ) {
// Can't phase through floor
can_z_move = false;
}
// If we're trying to go up but can't fly, check if we can climb. If we can't, then don't
// This prevents non-climb/fly enemies running up walls
if( candidate.z > posz() && !( via_ramp || flies() ) ) {
if( !can_climb() || !here.has_floor_or_support( candidate ) ) {
// Can't "jump" up a whole z-level
can_z_move = false;
}
}
// Last chance - we can still do the z-level stair teleport bullshit that isn't removed yet
// TODO: Remove z-level stair bullshit teleport after aligning all stairs
if( !can_z_move &&
posx() / ( SEEX * 2 ) == candidate.x / ( SEEX * 2 ) &&
posy() / ( SEEY * 2 ) == candidate.y / ( SEEY * 2 ) ) {
const tripoint &upper = candidate.z > posz() ? candidate : pos();
const tripoint &lower = candidate.z > posz() ? pos() : candidate;
if( here.has_flag( TFLAG_GOES_DOWN, upper ) && here.has_flag( TFLAG_GOES_UP, lower ) ) {
can_z_move = true;
}
}
if( !can_z_move ) {
continue;
}
}
// A flag to allow non-stumbling critters to stumble when the most direct choice is bad.
bool bad_choice = false;
const Creature *target = g->critter_at( candidate, is_hallucination() );
if( target != nullptr ) {
const Attitude att = attitude_to( *target );
if( att == Attitude::HOSTILE ) {
// When attacking an adjacent enemy, we're direct.
moved = true;
next_step = candidate_abs;
break;
} else if( att == Attitude::FRIENDLY && ( target->is_player() || target->is_npc() ||
target->has_flag( MF_QUEEN ) ) ) {
// Friendly firing the player or an NPC is illegal for gameplay reasons.
// Monsters should instinctively avoid attacking queens that regenerate their own population.
continue;
} else if( !has_flag( MF_ATTACKMON ) && !has_flag( MF_PUSH_MON ) ) {
// Bail out if there's a non-hostile monster in the way and we're not pushy.
continue;
}
// Friendly fire and pushing are always bad choices - they take a lot of time
bad_choice = true;
}
// is there an openable door?
if( can_open_doors &&
here.open_door( candidate, !here.is_outside( pos() ), true ) ) {
moved = true;
next_step = candidate_abs;
continue;
}
// Try to shove vehicle out of the way
shove_vehicle( destination, candidate );
// Bail out if we can't move there and we can't bash.
if( !pathed && !can_move_to( candidate ) ) {
if( !can_bash ) {
continue;