feat: first basic enemy patrolling behaviour

modules/wave_survival/enemy_body.cpp

@@ -0,0 +1,58 @@
+#include "enemy_body.h"
+#include "macros.h"
+#include "npc_unit.h"
+
+void EnemyBody::_bind_methods() {}
+
+void EnemyBody::ready() {
+	this->fsm = cast_to<StateMachine>(get_node(NodePath("%StateMachine")));
+	this->nav = cast_to<NavigationAgent3D>(get_node(NodePath("%NavigationAgent3D")));
+}
+
+void EnemyBody::physics_process(double delta) {
+	GETSET(velocity, {
+		velocity = Vector3{ this->movement_direction.x, velocity.y, this->movement_direction.y };
+	});
+	move_and_slide();
+}
+
+void EnemyBody::_notification(int what) {
+	if (Engine::get_singleton()->is_editor_hint()) {
+		return;
+	}
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			set_physics_process(true);
+			ready();
+			return;
+		case NOTIFICATION_PHYSICS_PROCESS:
+			physics_process(get_physics_process_delta_time());
+			return;
+	}
+}
+
+void EnemyBody::set_movement_direction(Vector2 direction) {
+	this->movement_direction = direction;
+}
+
+void EnemyBody::set_unit(NpcUnit *unit) {
+	this->unit = unit;
+}
+
+NpcUnit *EnemyBody::get_unit() const {
+	return this->unit;
+}
+
+NavigationAgent3D *EnemyBody::get_nav() const {
+	return this->nav;
+}
+
+void EnemyBody::set_movement_speed(float value) {
+	this->movement_speed = value;
+}
+
+float EnemyBody::get_movement_speed() const {
+	return this->movement_speed;
+}