/**
* \brief Attacks the hero if possible.
*
* This function is called when there is a collision between the enemy and the hero.
*
* \param hero the hero
* \param this_sprite the sprite of this enemy that detected the collision with the hero,
* or NULL if it was not a pixel-precise collision.
*/
void Enemy::attack_hero(Hero &hero, Sprite *this_sprite) {
if (!is_immobilized() && can_attack && hero.can_be_hurt(this)) {
bool hero_protected = false;
if (minimum_shield_needed != 0
&& get_equipment().has_ability("shield", minimum_shield_needed)) {
// compute the direction corresponding to the angle between the enemy and the hero
double angle = hero.get_angle(*this);
int protected_direction4 = (int) ((angle + Geometry::PI_OVER_2 / 2.0) * 4 / Geometry::TWO_PI);
protected_direction4 = (protected_direction4 + 4) % 4;
// also get the direction of the enemy's sprite
int sprite_opposite_direction4 = -1;
if (this_sprite != NULL) {
sprite_opposite_direction4 = (this_sprite->get_current_direction() + 2) % 4;
}
// the hero is protected if he is facing the opposite of one of these directions
hero_protected = hero.is_facing_direction4(protected_direction4) ||
hero.is_facing_direction4(sprite_opposite_direction4);
}
if (hero_protected) {
attack_stopped_by_hero_shield();
}
else {
hero.hurt(*this, damage_on_hero, magic_damage_on_hero);
}
}
}
/**
* \brief Returns whether this enemy is in a normal state.
*
* The enemy is considered to be in its normal state if
* it is not disabled, dying, being hurt or immobilized.
* When this method returns false, the subclasses of Enemy
* should not change the enemy properties.
*
* \return true if this enemy is in a normal state
*/
bool Enemy::is_in_normal_state() const {
return is_enabled()
&& !is_being_hurt()
&& get_life() > 0
&& !is_immobilized()
&& !is_being_removed();
}
/**
* \brief Notifies this enemy that it should restart his movement.
*
* This function is called when the enemy needs to restart its movement
* because something happened (for example the enemy has just been created,
* or it was just hurt).
* By default, the "walking" animation is set on the enemy's sprites.
*/
void Enemy::restart() {
if (is_immobilized()) {
stop_immobilized();
}
set_animation("walking");
get_lua_context().enemy_on_restarted(*this);
}
/**
* \brief Kills the enemy.
*
* This function is called when the enemy has no more health points.
*/
void Enemy::kill() {
// if the enemy is immobilized, give some money
if (rank == RANK_NORMAL && is_immobilized() && !treasure.is_saved()) {
// TODO choose random money (can we do this from scripts?)
}
// stop any movement and disable attacks
set_collision_modes(COLLISION_NONE);
clear_movement();
invulnerable = true;
can_attack = false;
can_attack_again_date = 0;
dying_animation_started = true;
if (hurt_style == HURT_BOSS) {
// A boss: create some explosions.
exploding = true;
nb_explosions = 0;
next_explosion_date = System::now() + 2000;
}
else {
// Replace the enemy sprites.
clear_sprites();
switch (get_ground_below()) {
case GROUND_HOLE:
// TODO animation of falling into a hole.
Sound::play("jump");
break;
case GROUND_DEEP_WATER:
// TODO water animation.
Sound::play("splash");
break;
case GROUND_LAVA:
// TODO lava animation.
Sound::play("splash");
break;
default:
create_sprite("enemies/enemy_killed");
Sound::play("enemy_killed");
break;
}
}
// save the enemy state if required
if (is_saved()) {
get_savegame().set_boolean(savegame_variable, true);
}
}
/**
* \brief Attacks the hero if possible.
*
* This function is called when there is a collision between the enemy and the hero.
*
* \param hero The hero to attack.
* \param this_sprite The sprite of this enemy that detected the collision with the hero,
* or NULL if it was not a pixel-precise collision.
*/
void Enemy::attack_hero(Hero& hero, Sprite* this_sprite) {
if (!is_immobilized()
&& can_attack
&& hero.can_be_hurt(this)) {
bool hero_protected = false;
if (minimum_shield_needed != 0
&& get_equipment().has_ability(ABILITY_SHIELD, minimum_shield_needed)
&& hero.can_use_shield()) {
// Compute the direction corresponding to the angle between the enemy and the hero.
double angle = hero.get_angle(*this, NULL, this_sprite);
int protected_direction4 = (int) ((angle + Geometry::PI_OVER_2 / 2.0) * 4 / Geometry::TWO_PI);
protected_direction4 = (protected_direction4 + 4) % 4;
// Also get the direction of the enemy's sprite.
int sprite_opposite_direction4 = -1;
if (this_sprite != NULL) {
sprite_opposite_direction4 = (this_sprite->get_current_direction() + 2) % 4;
}
// The hero is protected if he is facing the opposite of one of these directions.
hero_protected = hero.is_facing_direction4(protected_direction4) ||
hero.is_facing_direction4(sprite_opposite_direction4);
}
if (hero_protected) {
attack_stopped_by_hero_shield();
}
else {
// Let the enemy script handle this if it wants.
const bool handled = get_lua_context().enemy_on_attacking_hero(
*this, hero, this_sprite);
if (!handled) {
// Scripts did not customize the attack:
// do the built-in hurt state of the hero.
hero.hurt(*this, this_sprite, damage_on_hero);
}
}
}
}
/**
* \brief Updates the enemy.
*/
void Enemy::update() {
MapEntity::update();
if (is_suspended() || !is_enabled()) {
return;
}
uint32_t now = System::now();
if (being_hurt) {
// see if we should stop the animation "hurt"
if (now >= stop_hurt_date) {
being_hurt = false;
set_movement_events_enabled(true);
if (life <= 0) {
kill();
}
else if (is_immobilized()) {
clear_movement();
set_animation("immobilized");
notify_immobilized();
}
else {
clear_movement();
restart();
}
}
}
if (life > 0 && invulnerable && now >= vulnerable_again_date && !being_hurt) {
invulnerable = false;
}
if (life > 0 && !can_attack && !is_immobilized()
&& can_attack_again_date != 0 && now >= can_attack_again_date) {
can_attack = true;
}
if (is_immobilized() && !is_killed() && now >= end_shaking_date &&
get_sprite().get_current_animation() == "shaking") {
restart();
}
if (is_immobilized() && !is_killed() && !is_being_hurt() && now >= start_shaking_date &&
get_sprite().get_current_animation() != "shaking") {
end_shaking_date = now + 2000;
set_animation("shaking");
}
if (exploding) {
uint32_t now = System::now();
if (now >= next_explosion_date) {
// create an explosion
Rectangle xy;
xy.set_x(get_top_left_x() + Random::get_number(get_width()));
xy.set_y(get_top_left_y() + Random::get_number(get_height()));
get_entities().add_entity(new Explosion("", LAYER_HIGH, xy, false));
Sound::play("explosion");
next_explosion_date = now + 200;
nb_explosions++;
if (nb_explosions >= 15) {
exploding = false;
}
}
}
if (is_killed() && is_dying_animation_finished()) {
// Create the pickable treasure if any.
get_entities().add_entity(Pickable::create(get_game(),
"", get_layer(), get_x(), get_y(),
treasure, FALLING_HIGH, false));
// Remove the enemy.
remove_from_map();
// Notify Lua that this enemy is dead.
// We need to do this after remove_from_map() so that this enemy is
// considered dead in functions like map:has_entities(prefix).
notify_dead();
}
get_lua_context().enemy_on_update(*this);
}
/**
* \brief Makes the enemy receive an attack.
*
* He might resist to the attack or get hurt.
*
* \param attack type of attack
* \param source the entity attacking the enemy (often the hero)
* \param this_sprite the sprite of this enemy that received the attack, or NULL
* if the attack comes from a non pixel-precise collision test
*/
void Enemy::try_hurt(EnemyAttack attack, MapEntity& source, Sprite* this_sprite) {
EnemyReaction::Reaction reaction = get_attack_consequence(attack, this_sprite);
if (invulnerable || reaction.type == EnemyReaction::IGNORED) {
// ignore the attack
return;
}
invulnerable = true;
vulnerable_again_date = System::now() + 500;
switch (reaction.type) {
case EnemyReaction::PROTECTED:
// attack failure sound
Sound::play("sword_tapping");
break;
case EnemyReaction::IMMOBILIZED:
// get immobilized
hurt(source);
immobilize();
notify_hurt(source, attack, 0);
break;
case EnemyReaction::CUSTOM:
// custom attack (defined in the script)
if (is_in_normal_state()) {
custom_attack(attack, this_sprite);
}
else {
// no attack was made: notify the source correctly
reaction.type = EnemyReaction::IGNORED;
invulnerable = false;
}
break;
case EnemyReaction::HURT:
if (is_immobilized() && get_sprite().get_current_animation() == "shaking") {
stop_immobilized();
}
// compute the number of health points lost by the enemy
if (attack == ATTACK_SWORD) {
// for a sword attack, the damage depends on the sword and the variant of sword attack used
int damage_multiplicator = ((Hero&) source).get_sword_damage_factor();
reaction.life_lost *= damage_multiplicator;
}
else if (attack == ATTACK_THROWN_ITEM) {
reaction.life_lost *= ((CarriedItem&) source).get_damage_on_enemies();
}
life -= reaction.life_lost;
hurt(source);
notify_hurt(source, attack, reaction.life_lost);
break;
case EnemyReaction::IGNORED:
case EnemyReaction::REACTION_NUMBER:
Debug::die(StringConcat() << "Invalid enemy reaction" << reaction.type);
break;
}
// notify the source
source.notify_attacked_enemy(attack, *this, reaction, get_life() <= 0);
}
/**
* \brief Makes the enemy receive an attack.
*
* He might resist to the attack or get hurt.
*
* \param attack type of attack
* \param source the entity attacking the enemy (often the hero)
* \param this_sprite the sprite of this enemy that received the attack, or NULL
* if the attack comes from a non pixel-precise collision test
*/
void Enemy::try_hurt(EnemyAttack attack, MapEntity& source, Sprite* this_sprite) {
EnemyReaction::Reaction reaction = get_attack_consequence(attack, this_sprite);
if (invulnerable || reaction.type == EnemyReaction::IGNORED) {
// ignore the attack
return;
}
invulnerable = true;
vulnerable_again_date = System::now() + 500;
switch (reaction.type) {
case EnemyReaction::PROTECTED:
// attack failure sound
Sound::play("sword_tapping");
break;
case EnemyReaction::IMMOBILIZED:
// get immobilized
being_hurt = true;
hurt(source, this_sprite);
immobilize();
break;
case EnemyReaction::CUSTOM:
// custom attack (defined in the script)
if (is_in_normal_state()) {
custom_attack(attack, this_sprite);
}
else {
// no attack was made: notify the source correctly
reaction.type = EnemyReaction::IGNORED;
invulnerable = false;
}
break;
case EnemyReaction::HURT:
if (is_immobilized() && get_sprite().get_current_animation() == "shaking") {
stop_immobilized();
}
// Compute the number of health points lost by the enemy.
being_hurt = true;
if (attack == ATTACK_SWORD) {
Hero& hero = static_cast<Hero&>(source);
// Sword attacks only use pixel-precise collisions.
Debug::check_assertion(this_sprite != NULL,
"Missing enemy sprite for sword attack"
);
// For a sword attack, the damage may be something customized.
bool customized = get_lua_context().enemy_on_hurt_by_sword(
*this, hero, *this_sprite);
if (customized) {
reaction.life_lost = 0; // Already done by the script.
}
else {
// If this is not customized, the default it to multiply the reaction
// by a factor that depends on the sword.
reaction.life_lost *= hero.get_sword_damage_factor();
}
}
else if (attack == ATTACK_THROWN_ITEM) {
reaction.life_lost *= static_cast<CarriedItem&>(source).get_damage_on_enemies();
}
life -= reaction.life_lost;
hurt(source, this_sprite);
notify_hurt(source, attack);
break;
case EnemyReaction::IGNORED:
case EnemyReaction::REACTION_NUMBER:
{
std::ostringstream oss;
oss << "Invalid enemy reaction: " << reaction.type;
Debug::die(oss.str());
break;
}
}
// notify the source
source.notify_attacked_enemy(
attack,
*this,
this_sprite,
reaction,
get_life() <= 0
);
}