feat: implemented damage box

modules/wave_survival/damage_box.cpp

@@ -0,0 +1,47 @@
+#include "damage_box.h"
+#include "health_status.h"
+#include "hitbox.h"
+
+void DamageBox::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("attack_motion_begin"), &self_type::attack_motion_begin);
+	ClassDB::bind_method(D_METHOD("attack_motion_end"), &self_type::attack_motion_end);
+}
+
+void DamageBox::attack_motion_begin() {
+	set_monitoring(true);
+}
+
+void DamageBox::attack_motion_end() {
+	this->already_hit.clear();
+	set_monitoring(true);
+}
+
+void DamageBox::on_body_entered(Node3D *node) {
+	if (Hitbox * box{ cast_to<Hitbox>(node) }) {
+		if (!this->already_hit.has(box->get_health())) {
+			box->get_health()->damage(this->damage * box->get_damage_modifier());
+			this->already_hit.insert(box->get_health());
+		}
+	}
+}
+
+void DamageBox::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			connect("body_entered", callable_mp(this, &self_type::on_body_entered));
+			return;
+	}
+}
+
+void DamageBox::set_damage(int amount) {
+	this->damage = amount;
+}
+
+int DamageBox::get_damage() const {
+	return this->damage;
+}

modules/wave_survival/damage_box.h

@@ -0,0 +1,27 @@
+#ifndef DAMAGE_BOX_H
+#define DAMAGE_BOX_H
+
+#include "core/templates/hash_set.h"
+#include "scene/3d/physics/area_3d.h"
+class HealthStatus;
+
+class DamageBox : public Area3D {
+	GDCLASS(DamageBox, Area3D);
+	static void _bind_methods();
+	void attack_motion_begin();
+	void attack_motion_end();
+	void on_body_entered(Node3D *body);
+
+protected:
+	void _notification(int what);
+
+public:
+	void set_damage(int amount);
+	int get_damage() const;
+
+private:
+	int damage{ 1 };
+	HashSet<HealthStatus *> already_hit{};
+};
+
+#endif // !DAMAGE_BOX_H

modules/wave_survival/register_types.cpp

@@ -1,6 +1,7 @@
 #include "register_types.h"
 
 #include "core/object/class_db.h"
+#include "wave_survival/damage_box.h"
 #include "wave_survival/enemies/enemy_wretched.h"
 #include "wave_survival/enemy_body.h"
 #include "wave_survival/health_status.h"
@@ -41,6 +42,7 @@ void initialize_wave_survival_module(ModuleInitializationLevel p_level) {
 	GDREGISTER_CLASS(WretchedAttackState);
 	GDREGISTER_CLASS(PlayerDetector);
 	GDREGISTER_CLASS(Hitbox);
+	GDREGISTER_CLASS(DamageBox);
 }
 
 void uninitialize_wave_survival_module(ModuleInitializationLevel p_level) {