godot/Main.gdns

@@ -1,6 +1,6 @@
 [gd_resource type="NativeScript" load_steps=2 format=2]
 
-[ext_resource path="res://gdnative/libalai.tres" type="GDNativeLibrary" id=1]
+[ext_resource path="res://gdnative/alai.tres" type="GDNativeLibrary" id=1]
 
 [resource]
 resource_name = "Main"

godot/Main.tscn

@@ -7,9 +7,3 @@
 script = ExtResource( 1 )
 
 [node name="Level1" parent="." instance=ExtResource( 2 )]
-
-[node name="StateMachine" type="Node" parent="."]
-
-[node name="Walk" type="Node" parent="StateMachine"]
-
-[node name="Run" type="Node" parent="StateMachine"]

godot/characters/player/Player.gdns

@@ -1,8 +1,13 @@
 [gd_resource type="NativeScript" load_steps=2 format=2]
 
-[ext_resource path="res://gdnative/libalai.tres" type="GDNativeLibrary" id=1]
+[sub_resource type="GDNativeLibrary" id=1]
+symbol_prefix = "godot_player"
+entry/Windows.64 = "res://gdnative/windows.64/libalai.dll"
+entry/X11.64 = "res://gdnative/linux.64/libalai.so"
+dependency/Windows.64 = [  ]
+dependency/X11.64 = [  ]
 
 [resource]
 resource_name = "Player"
 class_name = "Player"
-library = ExtResource( 1 )
+library = SubResource( 1 )

godot/characters/player/Player.tscn

@@ -1,13 +1,18 @@
-[gd_scene load_steps=4 format=2]
+[gd_scene load_steps=9 format=2]
 
 [ext_resource path="res://characters/player/sprites/green.tres" type="SpriteFrames" id=1]
-[ext_resource path="res://characters/player/Player.gdns" type="Script" id=3]
+[ext_resource path="res://characters/player/states/Idle.gdns" type="Script" id=2]
+[ext_resource path="res://state_machine/StateMachine.gdns" type="Script" id=3]
+[ext_resource path="res://characters/player/states/Move.gdns" type="Script" id=4]
+[ext_resource path="res://characters/player/Player.gdns" type="Script" id=5]
+[ext_resource path="res://characters/player/states/Jump.gdns" type="Script" id=6]
+[ext_resource path="res://characters/player/states/Fall.gdns" type="Script" id=7]
 
 [sub_resource type="RectangleShape2D" id=1]
-extents = Vector2( 7, 11.5 )
+extents = Vector2( 7, 12 )
 
 [node name="Player" type="KinematicBody2D"]
-script = ExtResource( 3 )
+script = ExtResource( 5 )
 
 [node name="AnimatedSprite" type="AnimatedSprite" parent="."]
 frames = ExtResource( 1 )
@@ -15,17 +20,21 @@ animation = "idle"
 centered = false
 
 [node name="CollisionShape2D" type="CollisionShape2D" parent="."]
-position = Vector2( 12, 12.5 )
+position = Vector2( 12, 12 )
 shape = SubResource( 1 )
 
 [node name="StateMachine" type="Node" parent="."]
+script = ExtResource( 3 )
+default_state = "Idle"
 
 [node name="Idle" type="Node" parent="StateMachine"]
+script = ExtResource( 2 )
 
 [node name="Move" type="Node" parent="StateMachine"]
+script = ExtResource( 4 )
 
 [node name="Jump" type="Node" parent="StateMachine"]
-
+script = ExtResource( 6 )
-[node name="DoubleJump" type="Node" parent="StateMachine"]
 
 [node name="Fall" type="Node" parent="StateMachine"]
+script = ExtResource( 7 )

godot/characters/player/states/Fall.gdns

@@ -0,0 +1,8 @@
+[gd_resource type="NativeScript" load_steps=2 format=2]
+
+[ext_resource path="res://gdnative/alai.tres" type="GDNativeLibrary" id=1]
+
+[resource]
+resource_name = "PlayerFall"
+class_name = "PlayerFall"
+library = ExtResource( 1 )

godot/characters/player/states/Idle.gdns

@@ -0,0 +1,8 @@
+[gd_resource type="NativeScript" load_steps=2 format=2]
+
+[ext_resource path="res://gdnative/alai.tres" type="GDNativeLibrary" id=1]
+
+[resource]
+resource_name = "PlayerIdle"
+class_name = "PlayerIdle"
+library = ExtResource( 1 )

godot/characters/player/states/Jump.gdns

@@ -0,0 +1,8 @@
+[gd_resource type="NativeScript" load_steps=2 format=2]
+
+[ext_resource path="res://gdnative/alai.tres" type="GDNativeLibrary" id=1]
+
+[resource]
+resource_name = "PlayerJump"
+class_name = "PlayerJump"
+library = ExtResource( 1 )

godot/characters/player/states/Move.gdns

@@ -0,0 +1,8 @@
+[gd_resource type="NativeScript" load_steps=2 format=2]
+
+[ext_resource path="res://gdnative/alai.tres" type="GDNativeLibrary" id=1]
+
+[resource]
+resource_name = "PlayerMove"
+class_name = "PlayerMove"
+library = ExtResource( 1 )

godot/state_machine/State.gdns

@@ -0,0 +1,8 @@
+[gd_resource type="NativeScript" load_steps=2 format=2]
+
+[ext_resource path="res://gdnative/libalai.tres" type="GDNativeLibrary" id=1]
+
+[resource]
+resource_name = "State"
+class_name = "State"
+library = ExtResource( 1 )

godot/state_machine/StateMachine.gdns

@@ -0,0 +1,8 @@
+[gd_resource type="NativeScript" load_steps=2 format=2]
+
+[ext_resource path="res://gdnative/alai.tres" type="GDNativeLibrary" id=1]
+
+[resource]
+resource_name = "StateMachine"
+class_name = "StateMachine"
+library = ExtResource( 1 )

src/Main.cpp

@@ -3,14 +3,15 @@
 #include <SceneTree.hpp>
 
 using namespace godot;
+using namespace main;
 
 void Main::_register_methods()
 {
     register_method("_ready", &Main::_ready);
     register_method("_physics_process", &Main::_physics_process);
-    register_property<Main, bool>("full_screen", &Main::set_full_screen, &Main::get_full_screen, ALAI_MAIN_FULL_SCREEN);
+    register_property<Main, bool>("full_screen", &Main::set_full_screen, &Main::get_full_screen, main::full_screen);
-    register_property<Main, Vector2>("window_size", &Main::set_window_size, &Main::get_window_size, ALAI_MAIN_WINDOW_SIZE);
+    register_property<Main, Vector2>("window_size", &Main::set_window_size, &Main::get_window_size, main::window_size);
-    register_property<Main, int8_t>("launch_screen", &Main::set_launch_screen, &Main::get_launch_screen, ALAI_MAIN_LAUNCH_SCREEN);
+    register_property<Main, int8_t>("launch_screen", &Main::set_launch_screen, &Main::get_launch_screen, main::launch_screen);
 }
 
 Main::Main()
@@ -26,9 +27,9 @@ void Main::_init()
     _os = OS::get_singleton();
     _input = Input::get_singleton();
 
-    full_screen = ALAI_MAIN_FULL_SCREEN;
+    full_screen = main::full_screen;
-    window_size = ALAI_MAIN_WINDOW_SIZE;
+    window_size = main::window_size;
-    launch_screen = ALAI_MAIN_LAUNCH_SCREEN;
+    launch_screen = main::launch_screen;
 }
 
 void Main::_ready()
@@ -39,17 +40,10 @@ void Main::_ready()
     }
     else
     {
-        String resolution = String("Resolution before: " + String().num(_os->get_window_size().x) + "x" + String().num(_os->get_window_size().y));
-        Godot::print(resolution);
-
         _os->set_window_size(window_size);
         _os->set_window_position(
             _os->get_screen_position(get_launch_screen()) + _os->get_screen_size() *  0.5 - _os->get_window_size() * 0.5
         );
-
-        resolution = String("Resolution after: " + String().num(_os->get_window_size().x) + "x" + String().num(_os->get_window_size().y));
-
-        Godot::print(resolution);
     }
 }
 

src/Main.h

@@ -6,138 +6,130 @@
 #include <OS.hpp>
 #include <Input.hpp>
 
-/**
- * @brief If the game should be full screen or not by default.
- */
-#define ALAI_MAIN_FULL_SCREEN false
-/**
- * @brief The default size of the window.
- * @details This is ignored if full screen is true.
- */
-#define ALAI_MAIN_WINDOW_SIZE Vector2(1280, 720)
-/**
- * @brief Which screen to launch the game on.
- * @details If -1 it will launch the game on the "active" screen. Anything between 0 and N represents the screen number to show the game on when opened.
- */
-#define ALAI_MAIN_LAUNCH_SCREEN -1
-
 /**
  * @brief This is the godot namespace for all the code included in the library.
  * @details This namespace is used a prefix when the Godot engine looks for classes, methods, and properties.
  */
 namespace godot
 {
-    /**
+    namespace main
-     * @brief This class controls the Main node.
-     * @details The main node is responsible for controling the window and the game iteself is a child of it.
-     */
-    class Main : public Node
     {
-        GODOT_CLASS(Main, Node)
+        const bool full_screen = false;
+        const Vector2 window_size = Vector2(1280, 720);
+        const int8_t launch_screen = -1;
 
-        private:
+        /**
-            /**
+         * @brief This class controls the Main node.
-             * @brief OS singleton.
+         * @details The main node is responsible for controling the window and the game iteself is a child of it.
-             */
+         */
-            OS *_os;
+        class Main : public Node
-            /**
+        {
-             * @brief Input singleton.
+            GODOT_CLASS(Main, Node)
-             */
-            Input *_input;
 
-            /**
+            private:
-             * @brief If the window is full screen or not.
+                /**
-             */
+                 * @brief OS singleton.
-            bool full_screen;
+                 */
-            /**
+                OS *_os;
-             * @brief The size of the window.
+                /**
-             */
+                 * @brief Input singleton.
-            Vector2 window_size;
+                 */
-            /**
+                Input *_input;
-             * @brief The screen to launch the game on.
-             */
-            int8_t launch_screen;
 
-        public:
+                /**
-            /**
+                 * @brief If the window is full screen or not.
-             * @brief This method registers classes with Godot.
+                 */
-             * @details This method registers methods, properties, and signals with the Godot engine.
+                bool full_screen;
-             */
+                /**
-            static void _register_methods();
+                 * @brief The size of the window.
+                 */
+                Vector2 window_size;
+                /**
+                 * @brief The screen to launch the game on.
+                 */
+                int8_t launch_screen;
 
-            /**
+            public:
-             * @brief Construct a new Main object.
+                /**
-             */
+                 * @brief This method registers classes with Godot.
-            Main();
+                 * @details This method registers methods, properties, and signals with the Godot engine.
+                 */
+                static void _register_methods();
 
-            /**
+                /**
-             * @brief Destroy the Main object.
+                 * @brief Construct a new Main object.
-             */
+                 */
-            ~Main();
+                Main();
 
-            /**
+                /**
-             * @brief Initialize the class from Godot.
+                 * @brief Destroy the Main object.
-             * @details This method is called just once when the Godot engine connects to the instance of the class.
+                 */
-             */
+                ~Main();
-            void _init();
 
-            /**
+                /**
-             * @brief Code to be run when ready.
+                 * @brief Initialize the class from Godot.
-             * @details This method is run when all the children of this node are ready.
+                 * @details This method is called just once when the Godot engine connects to the instance of the class.
-             */
+                 */
-            void _ready();
+                void _init();
 
-            /**
+                /**
-             * @brief This class handles the physics processing.
+                 * @brief Code to be run when ready.
-             * @details Every delta time, this function is called to check for input and update positioning.
+                 * @details This method is run when all the children of this node are ready.
-             * 
+                 */
-             * @param[in] delta The difference in time that passed since the last call to this method.
+                void _ready();
-             */
-            void _physics_process(float delta);
 
-            /**
+                /**
-             * @brief Set the full screen object.
+                 * @brief This class handles the physics processing.
-             * 
+                 * @details Every delta time, this function is called to check for input and update positioning.
-             * @param[in] new_full_screen The new full screen state.
+                 * 
-             */
+                 * @param[in] delta The difference in time that passed since the last call to this method.
-            void set_full_screen(bool new_full_screen);
+                 */
+                void _physics_process(float delta);
 
-            /**
+                /**
-             * @brief Get the full screen object.
+                 * @brief Set the full screen object.
-             * 
+                 * 
-             * @return true If full screen.
+                 * @param[in] new_full_screen The new full screen state.
-             * @return false If not full screen.
+                 */
-             */
+                void set_full_screen(bool new_full_screen);
-            bool get_full_screen();
 
-            /**
+                /**
-             * @brief Set the window size object.
+                 * @brief Get the full screen object.
-             * 
+                 * 
-             * @param[in] new_window_size The new window size.
+                 * @return true If full screen.
-             */
+                 * @return false If not full screen.
-            void set_window_size(Vector2 new_window_size);
+                 */
+                bool get_full_screen();
 
-            /**
+                /**
-             * @brief Get the window size object.
+                 * @brief Set the window size object.
-             * 
+                 * 
-             * @return Vector2 The window size.
+                 * @param[in] new_window_size The new window size.
-             */
+                 */
-            Vector2 get_window_size();
+                void set_window_size(Vector2 new_window_size);
 
-            /**
+                /**
-             * @brief Set the launch screen object.
+                 * @brief Get the window size object.
-             * 
+                 * 
-             * @param[in] new_launch_screen The launch screen to use.
+                 * @return Vector2 The window size.
-             */
+                 */
-            void set_launch_screen(int8_t new_launch_screen);
+                Vector2 get_window_size();
 
-            /**
+                /**
-             * @brief Get the launch screen object.
+                 * @brief Set the launch screen object.
-             * 
+                 * 
-             * @return int8_t The launch screen.
+                 * @param[in] new_launch_screen The launch screen to use.
-             */
+                 */
-            int8_t get_launch_screen();
+                void set_launch_screen(int8_t new_launch_screen);
-    };
+
+                /**
+                 * @brief Get the launch screen object.
+                 * 
+                 * @return int8_t The launch screen.
+                 */
+                int8_t get_launch_screen();
+        };
+    }
 }
 
 #endif

src/godot.cpp

@@ -1,12 +1,13 @@
 #include <Godot.hpp>
 
-#include "StateMachine.h"
+#include "state_machine/StateMachine.h"
-#include "State.h"
+#include "state_machine/State.h"
-#include "Walk.h"
-#include "Run.h"
 #include "Main.h"
-#include "Player.h"
+#include "player/Player.h"
-#include "PlayerIdle.h"
+#include "player/states/PlayerIdle.h"
+#include "player/states/PlayerMove.h"
+#include "player/states/PlayerJump.h"
+#include "player/states/PlayerFall.h"
 
 using namespace godot;
 
@@ -28,9 +29,10 @@ extern "C" void GDN_EXPORT godot_nativescript_init(void *handle)
     Godot::nativescript_init(handle);
     register_class<StateMachine>();
     register_class<State>();
-    register_class<Walk>();
+    register_class<main::Main>();
-    register_class<Run>();
+    register_class<player::Player>();
-    register_class<Main>();
+    register_class<player::PlayerIdle>();
-    register_class<Player>();
+    register_class<player::PlayerMove>();
-    register_class<PlayerIdle>();
+    register_class<player::PlayerJump>();
+    register_class<player::PlayerFall>();
 }

src/player/Player.cpp

@@ -7,18 +7,20 @@
 #include <Texture.hpp>
 
 using namespace godot;
+using namespace player;
 
 void Player::_register_methods()
 {
     register_method("_ready", &Player::_ready);
     register_method("_physics_process", &Player::_physics_process);
-    register_method("_on_Player_player_moved", &Player::_on_Player_player_moved);
+    register_method("set_velocity", &Player::set_velocity);
+    register_method("get_velocity", &Player::get_velocity);
     //register_property<Player, Ref<SpriteFrames>>("sprite_frames", &Player::set_sprite_frames, &Player::get_sprite_frames, Ref<SpriteFrames>(), GODOT_METHOD_RPC_MODE_DISABLED, GODOT_PROPERTY_USAGE_DEFAULT, GODOT_PROPERTY_HINT_RESOURCE_TYPE, String("SpriteFrames"));
-    register_property<Player, float>("speed", &Player::set_speed, &Player::get_speed, ALAI_PLAYER_SPEED);
+    register_property<Player, float>("speed", &Player::set_speed, &Player::get_speed, player::speed);
-    register_property<Player, float>("jump_force", &Player::set_jump_force, &Player::get_jump_force, ALAI_PLAYER_JUMP_FORCE);
+    register_property<Player, float>("jump_force", &Player::set_jump_force, &Player::get_jump_force, player::jump_force);
-    register_property<Player, float>("gravity", &Player::set_gravity, &Player::get_gravity, ALAI_PLAYER_GRAVITY);
+    register_property<Player, float>("gravity", &Player::set_gravity, &Player::get_gravity, player::gravity);
-    register_property<Player, float>("run_speed", &Player::set_run_speed, &Player::get_run_speed, ALAI_PLAYER_RUN_SPEED);
+    register_property<Player, float>("run_speed", &Player::set_run_speed, &Player::get_run_speed, player::run_speed);
-    register_signal<Player>("player_moved", "position", GODOT_VARIANT_TYPE_VECTOR2);
+    register_property<Player, bool>("double_jump", &Player::set_double_jump, &Player::get_double_jump, player::double_jump);
 }
 
 Player::Player()
@@ -31,21 +33,18 @@ Player::~Player()
 
 void Player::_init()
 {
-    _os = OS::get_singleton();
-    _input = Input::get_singleton();
     _resource_loader = ResourceLoader::get_singleton();
 
-    //sprite_frames = _resource_loader->load(ALAI_PLAYER_SPRITE_FRAMES);
+    //sprite_frames = _resource_loader->load(player::sprite_frames);
-    set_speed(ALAI_PLAYER_SPEED);
+    set_speed(player::speed);
-    set_jump_force(ALAI_PLAYER_JUMP_FORCE);
+    set_jump_force(player::jump_force);
-    set_gravity(ALAI_PLAYER_GRAVITY);
+    set_gravity(player::gravity);
-    set_run_speed(ALAI_PLAYER_RUN_SPEED);
+    set_run_speed(player::run_speed);
+    set_double_jump(player::double_jump);
 
     coins = 0;
 
     velocity = Vector2();
-
-    jumping = 0;
 }
 
 void Player::_ready()
@@ -53,7 +52,7 @@ void Player::_ready()
     animated_sprite = get_node<AnimatedSprite>("AnimatedSprite");
     if (!animated_sprite)
     {
-        WARN_PRINT("AnimateSprite not found!");
+        ERR_PRINT("AnimateSprite not found!");
         animated_sprite = AnimatedSprite()._new();
     }
     //animated_sprite->set_sprite_frames(sprite_frames);
@@ -74,74 +73,7 @@ void Player::_ready()
 
 void Player::_physics_process(float delta)
 {
-    auto current_speed = get_speed();
-    velocity.x = 0;
-    if (_input->is_action_pressed("run"))
-    {
-        current_speed *= get_run_speed();
-    }
-
-    if (_input->is_action_pressed("right"))
-    {
-        velocity.x += current_speed;
-    }
-
-    if (_input->is_action_pressed("left"))
-    {
-        velocity.x += -current_speed;
-    }
-
-    if (velocity.x > 0)
-    {
-        animated_sprite->play("move");
-        animated_sprite->set_flip_h(true);
-    }
-    else if (velocity.x < 0)
-    {
-        animated_sprite->play("move");
-        animated_sprite->set_flip_h(false);
-    }
-    else
-    {
-        animated_sprite->stop();
-        animated_sprite->set_animation("idle");
-    }
-
-    if (jumping > 0 && is_on_floor())
-    {
-        animated_sprite->set_frame(1);
-        jumping = 0;
-    }
-
-    if (!is_on_floor())
-    {
-        animated_sprite->stop();
-        animated_sprite->set_animation("air");
-        if (jumping == 0)
-        {
-            jumping = 2;
-        }
-    }
-
     velocity.y += get_gravity();
-    if (_input->is_action_just_pressed("jump") && jumping < 2)
-    {
-        velocity.y = -get_jump_force();
-        jumping++;
-    }
-
-    if (_input->is_action_just_released("jump"))
-    {
-        if (velocity.y < -100)
-        {
-            velocity.y = -100;
-        }
-    }
-
-    if (velocity.x < 0 || velocity.x > 0)
-    {
-        //emit_signal("player_moved", get_position());
-    }
 
     velocity = move_and_slide(velocity, Vector2::UP, true);
     velocity.x = Math::lerp((float) velocity.x, (float) 0, (float) 0.2);
@@ -170,7 +102,6 @@ void Player::_physics_process(float delta)
         {
             if (get_parent()->get_class() == "TileMap")
             {
-                Godot::print("Off screen");
                 auto error = get_tree()->change_scene("res://Main.tscn");
                 if (error != Error::OK)
                 {
@@ -231,7 +162,22 @@ float Player::get_run_speed()
     return run_speed;
 }
 
-void Player::_on_Player_player_moved(Vector2 position)
+void Player::set_double_jump(bool double_jump)
 {
-    Godot::print(position);
+    this->double_jump = double_jump;
+}
+
+bool Player::get_double_jump()
+{
+    return this->double_jump;
+}
+
+void Player::set_velocity(Vector2 velocity)
+{
+    this->velocity = velocity;
+}
+
+Vector2 Player::get_velocity()
+{
+    return this->velocity;
 }

src/player/Player.h

@@ -1,37 +1,12 @@
 #ifndef ALAI_PLAYER_H
 #define ALAI_PLAYER_H
 
-/**
- * @brief This resource is loaded by default for the AnimatedSprite node.
- */
-#define ALAI_PLAYER_SPRITE_FRAMES "res://characters/player/sprites/green.tres"
-/**
- * @brief The speed the player should move it.
- */
-#define ALAI_PLAYER_SPEED 60.0
-/**
- * @brief The force applied to the player when jumping.
- */
-#define ALAI_PLAYER_JUMP_FORCE 300.0
-/**
- * @brief The gravity applied to the player.
- */
-#define ALAI_PLAYER_GRAVITY 9.81
-/**
- * @brief The multiplier used to change the speed of the player when running.
- */
-#define ALAI_PLAYER_RUN_SPEED 2.0
-
 #include <Godot.hpp>
 #include <KinematicBody2D.hpp>
-#include <OS.hpp>
 #include <Sprite.hpp>
-#include <Vector2.hpp>
-#include <Input.hpp>
 #include <AnimatedSprite.hpp>
 #include <SpriteFrames.hpp>
 #include <ResourceLoader.hpp>
-#include <PackedScene.hpp>
 
 /**
  * @brief This is the godot namespace for all the code included in the library.
@@ -39,181 +14,178 @@
  */
 namespace godot
 {
-    /**
+    namespace player
-     * @brief This class is used to control the player.
-     * @details This class allows the player to move, run, and jump as well as controls the sprite displayed for those actions.
-     */
-    class Player : public KinematicBody2D
     {
-        GODOT_CLASS(Player, KinematicBody2D)
+        const char player_sprite_frames[] = "res://characters/player/sprites/green.tres";
+        const float speed = 60.0;
+        const float jump_force = 300.0;
+        const float gravity = 9.81;
+        const float run_speed = 2.0;
+        const bool double_jump = true;
 
-        private:
+        /**
-            /**
+         * @brief This class is used to control the player.
-             * @brief OS singleton.
+         * @details This class allows the player to move, run, and jump as well as controls the sprite displayed for those actions.
-             */
+         */
-            OS *_os;
+        class Player : public KinematicBody2D
-            /**
+        {
-             * @brief Input singleton.
+            GODOT_CLASS(Player, KinematicBody2D)
-             */
-            Input *_input;
-            /**
-             * @brief ResourceLoader singleton.
-             */
-            ResourceLoader *_resource_loader;
 
-            /**
+            private:
-             * @brief The animated sprite connected to the KinematicBody2D.
+                /**
-             */
+                 * @brief ResourceLoader singleton.
-            AnimatedSprite *animated_sprite;
+                 */
-            /**
+                ResourceLoader *_resource_loader;
-             * @brief The sprite frames used in the animated sprite.
-             */
-            Ref<SpriteFrames> sprite_frames;
-            /**
-             * @brief The coins the player has collected.
-             */
-            uint8_t coins;
-            /**
-             * @brief The velocity at which moves the player moves.
-             */
-            Vector2 velocity;
-            /**
-             * @brief The speed that the player moves in.
-             */
-            float speed;
-            /**
-             * @brief The force applied to the player when jumping.
-             */
-            float jump_force;
-            /**
-             * @brief The gravity applied to the player.
-             */
-            float gravity;
-            /**
-             * @brief The speed multiplier used to make the player move faster.
-             */
-            float run_speed;
 
-            /**
+                /**
-             * @brief State of jumping of the player. To be replaced with a state machine in the future.
+                 * @brief The animated sprite connected to the KinematicBody2D.
-             */
+                 */
-            uint8_t jumping;
+                AnimatedSprite *animated_sprite;
+                /**
+                 * @brief The sprite frames used in the animated sprite.
+                 */
+                Ref<SpriteFrames> sprite_frames;
+                /**
+                 * @brief The coins the player has collected.
+                 */
+                uint8_t coins;
+                /**
+                 * @brief The velocity at which moves the player moves.
+                 */
+                Vector2 velocity;
+                /**
+                 * @brief The speed that the player moves in.
+                 */
+                float speed;
+                /**
+                 * @brief The force applied to the player when jumping.
+                 */
+                float jump_force;
+                /**
+                 * @brief The gravity applied to the player.
+                 */
+                float gravity;
+                /**
+                 * @brief The speed multiplier used to make the player move faster.
+                 */
+                float run_speed;
 
-        public:
+                bool double_jump;
-            /**
-             * @brief This method registers classes with Godot.
-             * @details This method registers methods, properties, and signals with the Godot engine.
-             */
-            static void _register_methods();
 
-            /**
+            public:
-             * @brief Construct a new Player object.
+                /**
-             */
+                 * @brief This method registers classes with Godot.
-            Player();
+                 * @details This method registers methods, properties, and signals with the Godot engine.
+                 */
+                static void _register_methods();
 
-            /**
+                /**
-             * @brief Destroy the Player object.
+                 * @brief Construct a new Player object.
-             */
+                 */
-            ~Player();
+                Player();
 
-            /**
+                /**
-             * @brief Initialize the class from Godot.
+                 * @brief Destroy the Player object.
-             * @details This method is called just once when the Godot engine connects to the instance of the class.
+                 */
-             */
+                ~Player();
-            void _init();
 
-            /**
+                /**
-             * @brief Code to be run when ready.
+                 * @brief Initialize the class from Godot.
-             * @details This method is run when all the children of this node are ready.
+                 * @details This method is called just once when the Godot engine connects to the instance of the class.
-             */
+                 */
-            void _ready();
+                void _init();
 
-            /**
+                /**
-             * @brief This class handles the physics processing.
+                 * @brief Code to be run when ready.
-             * @details Every delta time, this function is called to check for input and update positioning.
+                 * @details This method is run when all the children of this node are ready.
-             * 
+                 */
-             * @param[in] delta The difference in time that passed since the last call to this method.
+                void _ready();
-             */
-            void _physics_process(float delta);
 
-            /**
+                /**
-             * @brief Set the sprite frames object.
+                 * @brief This class handles the physics processing.
-             * 
+                 * @details Every delta time, this function is called to check for input and update positioning.
-             * @param[in] new_sprite_frames The new sprite frame.
+                 * 
-             */
+                 * @param[in] delta The difference in time that passed since the last call to this method.
-            void set_sprite_frames(Ref<SpriteFrames> new_sprite_frames);
+                 */
+                void _physics_process(float delta);
 
-            /**
+                /**
-             * @brief Get the sprite frames object.
+                 * @brief Set the sprite frames object.
-             * 
+                 * 
-             * @return Ref<SpriteFrames> A reference to the sprite frames object.
+                 * @param[in] new_sprite_frames The new sprite frame.
-             */
+                 */
-            Ref<SpriteFrames> get_sprite_frames();
+                void set_sprite_frames(Ref<SpriteFrames> new_sprite_frames);
 
-            /**
+                /**
-             * @brief Set the speed object.
+                 * @brief Get the sprite frames object.
-             * 
+                 * 
-             * @param[in] new_speed The new speed.
+                 * @return Ref<SpriteFrames> A reference to the sprite frames object.
-             */
+                 */
-            void set_speed(float new_speed);
+                Ref<SpriteFrames> get_sprite_frames();
 
-            /**
+                /**
-             * @brief Get the speed object.
+                 * @brief Set the speed object.
-             * 
+                 * 
-             * @return float The current speed of the player.
+                 * @param[in] new_speed The new speed.
-             */
+                 */
-            float get_speed();
+                void set_speed(float new_speed);
 
-            /**
+                /**
-             * @brief Set the jump force object.
+                 * @brief Get the speed object.
-             * 
+                 * 
-             * @param[in] new_jump_force The new force applied to the player to make him jump.
+                 * @return float The current speed of the player.
-             */
+                 */
-            void set_jump_force(float new_jump_force);
+                float get_speed();
 
-            /**
+                /**
-             * @brief Get the jump force object.
+                 * @brief Set the jump force object.
-             * 
+                 * 
-             * @return float The current force being applied to the player.
+                 * @param[in] new_jump_force The new force applied to the player to make him jump.
-             */
+                 */
-            float get_jump_force();
+                void set_jump_force(float new_jump_force);
 
-            /**
+                /**
-             * @brief Set the gravity object.
+                 * @brief Get the jump force object.
-             * 
+                 * 
-             * @param[in] new_gravity The new gravity to apply to the player.
+                 * @return float The current force being applied to the player.
-             */
+                 */
-            void set_gravity(float new_gravity);
+                float get_jump_force();
 
-            /**
+                /**
-             * @brief Get the gravity object.
+                 * @brief Set the gravity object.
-             * 
+                 * 
-             * @return float The current gravity applied to the player.
+                 * @param[in] new_gravity The new gravity to apply to the player.
-             */
+                 */
-            float get_gravity();
+                void set_gravity(float new_gravity);
 
-            /**
+                /**
-             * @brief Set the run speed object.
+                 * @brief Get the gravity object.
-             * 
+                 * 
-             * @param[in] new_run_speed The new speed for running.
+                 * @return float The current gravity applied to the player.
-             */
+                 */
-            void set_run_speed(float new_run_speed);
+                float get_gravity();
 
-            /**
+                /**
-             * @brief Get the run speed object.
+                 * @brief Set the run speed object.
-             * 
+                 * 
-             * @return float The current run speed of the player.
+                 * @param[in] new_run_speed The new speed for running.
-             */
+                 */
-            float get_run_speed();
+                void set_run_speed(float new_run_speed);
 
-            /**
+                /**
-             * @brief This signal is called when the player moves.
+                 * @brief Get the run speed object.
-             * @details The jump action is not included in this signal, just moving left or right.
+                 * 
-             * 
+                 * @return float The current run speed of the player.
-             * @param[in] position The new position of the player.
+                 */
-             */
+                float get_run_speed();
-            void _on_Player_player_moved(Vector2 position);
+
-    };
+                void set_double_jump(bool double_jump);
+                bool get_double_jump();
+
+                void set_velocity(Vector2 velocity);
+                Vector2 get_velocity();
+        };
+    }
 }
 
 #endif

src/player/states/PlayerFall.cpp

@@ -0,0 +1,78 @@
+#include "player/states/PlayerFall.h"
+#include "player/Player.h"
+
+using namespace godot;
+using namespace player;
+
+void PlayerFall::_register_methods()
+{
+    register_method("_state_enter", &PlayerFall::_state_enter);
+    register_method("_state_exit", &PlayerFall::_state_exit);
+    register_method("_physics_process", &PlayerFall::_physics_process);
+}
+
+PlayerFall::PlayerFall()
+{
+}
+
+PlayerFall::~PlayerFall()
+{
+}
+
+void PlayerFall::_init()
+{
+    _input = Input::get_singleton();
+}
+
+void PlayerFall::_state_enter()
+{
+    animated_sprite = get_parent()->get_node<AnimatedSprite>("AnimatedSprite");
+    animated_sprite->stop();
+    animated_sprite->set_animation("air");
+}
+
+void PlayerFall::_state_exit()
+{
+    animated_sprite->set_animation("move");
+    animated_sprite->set_frame(1);
+}
+
+void PlayerFall::_physics_process(float delta)
+{
+    auto parent = Object::cast_to<player::Player>(get_parent());
+
+    if (parent->is_on_floor())
+    {
+        get_state_machine()->change("Move");
+        return;
+    }
+
+    auto current_speed = parent->get_speed();
+    auto velocity = parent->get_velocity();
+    velocity.x = 0;
+    if (_input->is_action_pressed("run"))
+    {
+        current_speed *= parent->get_run_speed();
+    }
+
+    if (_input->is_action_pressed("right"))
+    {
+        velocity.x += current_speed;
+    }
+
+    if (_input->is_action_pressed("left"))
+    {
+        velocity.x += -current_speed;
+    }
+
+    if (velocity.x > 0)
+    {
+        animated_sprite->set_flip_h(true);
+    }
+    else if (velocity.x < 0)
+    {
+        animated_sprite->set_flip_h(false);
+    }
+
+    parent->set_velocity(velocity);
+}

src/player/states/PlayerFall.h

@@ -0,0 +1,44 @@
+#ifndef JUEGO_PLAYER_FALL_H
+#define JUEGO_PLAYER_FALL_H
+
+#include "state_machine/State.h"
+
+#include <Godot.hpp>
+#include <Input.hpp>
+#include <AnimatedSprite.hpp>
+
+namespace godot
+{
+    namespace player
+    {
+        class PlayerFall : public State
+        {
+            GODOT_CLASS(PlayerFall, State)
+
+            private:
+                Input *_input;
+                AnimatedSprite *animated_sprite;
+
+            public:
+                static void _register_methods();
+
+                PlayerFall();
+
+                ~PlayerFall();
+
+                /**
+                 * @brief Initialize the class from Godot.
+                 * @details This method is called just once when the Godot engine connects to the instance of the class.
+                 */
+                void _init();
+
+                void _state_enter();
+
+                void _state_exit();
+
+                void _physics_process(float delta);
+        };
+    }
+}
+
+#endif

src/player/states/PlayerIdle.cpp

@@ -0,0 +1,65 @@
+#include "player/states/PlayerIdle.h"
+#include "player/Player.h"
+
+using namespace godot;
+using namespace player;
+
+void PlayerIdle::_register_methods()
+{
+    register_method("_state_enter", &PlayerIdle::_state_enter);
+    register_method("_state_exit", &PlayerIdle::_state_exit);
+    register_method("_physics_process", &PlayerIdle::_physics_process);
+}
+
+PlayerIdle::PlayerIdle()
+{
+}
+
+PlayerIdle::~PlayerIdle()
+{
+}
+
+void PlayerIdle::_init()
+{
+    _input = Input::get_singleton();
+}
+
+void PlayerIdle::_state_enter()
+{
+    animated_sprite = get_parent()->get_node<AnimatedSprite>("AnimatedSprite");
+    animated_sprite->stop();
+    animated_sprite->set_animation("idle");
+}
+
+void PlayerIdle::_state_exit()
+{
+}
+
+void PlayerIdle::_physics_process(float delta)
+{
+    auto parent = Object::cast_to<player::Player>(get_parent());
+
+    if (_input->is_action_pressed("right"))
+    {
+        get_state_machine()->change("Move");
+        return;
+    }
+
+    if (_input->is_action_pressed("left"))
+    {
+        get_state_machine()->change("Move");
+        return;
+    }
+
+    if (_input->is_action_just_pressed("jump"))
+    {
+        get_state_machine()->change("Jump");
+        return;
+    }
+
+    if (!parent->is_on_floor())
+    {
+        get_state_machine()->change("Fall");
+        return;
+    }
+}

src/player/states/PlayerIdle.h

@@ -0,0 +1,45 @@
+#ifndef JUEGO_PLAYER_IDLE_H
+#define JUEGO_PLAYER_IDLE_H
+
+#include "state_machine/State.h"
+
+#include <Godot.hpp>
+#include <Node.hpp>
+#include <Input.hpp>
+#include <AnimatedSprite.hpp>
+
+namespace godot
+{
+    namespace player
+    {
+        class PlayerIdle : public State
+        {
+            GODOT_CLASS(PlayerIdle, State)
+
+            private:
+                Input *_input;
+                AnimatedSprite *animated_sprite;
+
+            public:
+                static void _register_methods();
+
+                PlayerIdle();
+
+                ~PlayerIdle();
+
+                /**
+                 * @brief Initialize the class from Godot.
+                 * @details This method is called just once when the Godot engine connects to the instance of the class.
+                 */
+                void _init();
+
+                void _state_enter();
+
+                void _state_exit();
+
+                void _physics_process(float delta);
+        };
+    }
+}
+
+#endif

src/player/states/PlayerJump.cpp

@@ -0,0 +1,105 @@
+#include "player/states/PlayerJump.h"
+#include "player/Player.h"
+
+using namespace godot;
+using namespace player;
+
+void PlayerJump::_register_methods()
+{
+    register_method("_state_enter", &PlayerJump::_state_enter);
+    register_method("_state_exit", &PlayerJump::_state_exit);
+    register_method("_physics_process", &PlayerJump::_physics_process);
+}
+
+PlayerJump::PlayerJump()
+{
+}
+
+PlayerJump::~PlayerJump()
+{
+}
+
+void PlayerJump::_init()
+{
+    _input = Input::get_singleton();
+}
+
+void PlayerJump::_state_enter(const String state)
+{
+    animated_sprite = get_parent()->get_node<AnimatedSprite>("AnimatedSprite");
+    animated_sprite->stop();
+    animated_sprite->set_animation("air");
+
+    if (state == "Jump")
+    {
+        double_jumped = true;
+    }
+    else
+    {
+        double_jumped = false;
+    }
+
+    auto parent = Object::cast_to<player::Player>(get_parent());
+    auto velocity = parent->get_velocity();
+    velocity.y = -parent->get_jump_force();
+    parent->set_velocity(velocity);
+}
+
+void PlayerJump::_state_exit()
+{
+        animated_sprite->set_animation("move");
+        animated_sprite->set_frame(1);
+}
+
+void PlayerJump::_physics_process(float delta)
+{
+    auto parent = Object::cast_to<player::Player>(get_parent());
+    if (parent->is_on_floor())
+    {
+        get_state_machine()->change("Move");
+        return;
+    }
+
+    auto current_speed = parent->get_speed();
+    auto velocity = parent->get_velocity();
+    velocity.x = 0;
+    if (_input->is_action_pressed("run"))
+    {
+        current_speed *= parent->get_run_speed();
+    }
+
+    if (_input->is_action_pressed("right"))
+    {
+        velocity.x += current_speed;
+    }
+
+    if (_input->is_action_pressed("left"))
+    {
+        velocity.x += -current_speed;
+    }
+
+    if (_input->is_action_just_released("jump"))
+    {
+        if (velocity.y < -100)
+        {
+            velocity.y = -100;
+        }
+    }
+
+    if (parent->get_double_jump() && !double_jumped && _input->is_action_just_pressed("jump"))
+    {
+        get_state_machine()->change("Jump");
+        return;
+    }
+
+    if (velocity.x > 0)
+    {
+        animated_sprite->set_flip_h(true);
+    }
+    else if (velocity.x < 0)
+    {
+        animated_sprite->set_flip_h(false);
+    }
+
+    parent->set_velocity(velocity);
+}

src/player/states/PlayerJump.h

@@ -0,0 +1,45 @@
+#ifndef JUEGO_PLAYER_JUMP_H
+#define JUEGO_PLAYER_JUMP_H
+
+#include "state_machine/State.h"
+
+#include <Godot.hpp>
+#include <Input.hpp>
+#include <AnimatedSprite.hpp>
+
+namespace godot
+{
+    namespace player
+    {
+        class PlayerJump : public State
+        {
+            GODOT_CLASS(PlayerJump, State)
+
+            private:
+                Input *_input;
+                AnimatedSprite *animated_sprite;
+                bool double_jumped;
+
+            public:
+                static void _register_methods();
+
+                PlayerJump();
+
+                ~PlayerJump();
+
+                /**
+                 * @brief Initialize the class from Godot.
+                 * @details This method is called just once when the Godot engine connects to the instance of the class.
+                 */
+                void _init();
+
+                void _state_enter(const String state);
+
+                void _state_exit();
+
+                void _physics_process(float delta);
+        };
+    }
+}
+
+#endif

src/player/states/PlayerMove.cpp

@@ -0,0 +1,94 @@
+#include "player/states/PlayerMove.h"
+#include "player/Player.h"
+
+using namespace godot;
+using namespace player;
+
+void PlayerMove::_register_methods()
+{
+    register_method("_state_enter", &PlayerMove::_state_enter);
+    register_method("_state_exit", &PlayerMove::_state_exit);
+    register_method("_physics_process", &PlayerMove::_physics_process);
+}
+
+PlayerMove::PlayerMove()
+{
+}
+
+PlayerMove::~PlayerMove()
+{
+}
+
+void PlayerMove::_init()
+{
+    _input = Input::get_singleton();
+}
+
+void PlayerMove::_state_enter(String state, Array args)
+{
+    animated_sprite = get_parent()->get_node<AnimatedSprite>("AnimatedSprite");
+    animated_sprite->set_animation("move");
+    animated_sprite->play();
+}
+
+void PlayerMove::_state_exit()
+{
+}
+
+void PlayerMove::_physics_process(float delta)
+{
+    auto parent = Object::cast_to<player::Player>(get_parent());
+
+    auto direction_pressed = false;
+
+    auto current_speed = parent->get_speed();
+    auto velocity = parent->get_velocity();
+    velocity.x = 0;
+    if (_input->is_action_pressed("run"))
+    {
+        current_speed *= parent->get_run_speed();
+    }
+
+    if (_input->is_action_pressed("right"))
+    {
+        direction_pressed = true;
+        velocity.x += current_speed;
+    }
+
+    if (_input->is_action_pressed("left"))
+    {
+        direction_pressed = true;
+        velocity.x += -current_speed;
+    }
+
+    if (_input->is_action_just_pressed("jump"))
+    {
+        get_state_machine()->change("Jump");
+        return;
+    }
+
+    if (velocity.x > 0)
+    {
+        animated_sprite->set_flip_h(true);
+    }
+    else if (velocity.x < 0)
+    {
+        animated_sprite->set_flip_h(false);
+    }
+    else
+    {
+        if (!direction_pressed)
+        {
+            get_state_machine()->change("Idle");
+        }
+        return;
+    }
+
+    parent->set_velocity(velocity);
+
+    if (!parent->is_on_floor())
+    {
+        get_state_machine()->change("Fall");
+        return;
+    }
+}

src/player/states/PlayerMove.h

@@ -0,0 +1,46 @@
+#ifndef JUEGO_PLAYER_MOVE_H
+#define JUEGO_PLAYER_MOVE_H
+
+#include "state_machine/State.h"
+
+#include <Godot.hpp>
+#include <Input.hpp>
+#include <AnimatedSprite.hpp>
+
+namespace godot
+{
+    namespace player
+    {
+        class PlayerMove : public State
+        {
+            GODOT_CLASS(PlayerMove, State)
+
+            private:
+                Input *_input;
+                AnimatedSprite *animated_sprite;
+
+            public:
+                static void _register_methods();
+
+                PlayerMove();
+
+                ~PlayerMove();
+
+                /**
+                 * @brief Initialize the class from Godot.
+                 * @details This method is called just once when the Godot engine connects to the instance of the class.
+                 */
+                void _init();
+
+                void _state_enter(String state, Array args);
+
+                void _state_exit();
+
+                void _physics_process(float delta);
+
+                Vector2 move_player(Vector2 velocity);
+        };
+    }
+}
+
+#endif

src/state_machine/State.cpp

@@ -0,0 +1,54 @@
+#include "State.h"
+
+using namespace godot;
+
+void State::_register_methods()
+{
+    register_method("set_parent", &State::set_parent);
+    register_method("get_parent", &State::get_parent);
+    register_method("set_state_machine", &State::set_state_machine);
+    register_method("_state_enter", &State::_state_enter);
+    register_method("_state_exit", &State::_state_exit);
+}
+
+State::State()
+{
+}
+
+State::~State()
+{
+}
+
+void State::_init()
+{
+}
+
+void State::_state_enter(const String state, const Array args)
+{
+    WARN_PRINT("State " + state + " is missing its _state_enter method!");
+}
+
+void State::_state_exit(const String state, const Array args)
+{
+    WARN_PRINT("State " + state + " is missing its _state_exit method!");
+}
+
+void State::set_parent(Node *new_parent)
+{
+    parent = new_parent;
+}
+
+Node *State::get_parent()
+{
+    return parent;
+}
+
+void State::set_state_machine(StateMachine *new_state_machine)
+{
+    state_machine = new_state_machine;
+}
+
+StateMachine *State::get_state_machine()
+{
+    return state_machine;
+}

src/state_machine/State.h

@@ -0,0 +1,46 @@
+#ifndef JUEGO_STATE_H
+#define JUEGO_STATE_H
+
+#include "StateMachine.h"
+
+#include <Godot.hpp>
+#include <Node.hpp>
+
+namespace godot
+{
+    class State : public StateMachine
+    {
+        GODOT_CLASS(State, Node)
+
+        private:
+            StateMachine *state_machine;
+
+        public:
+            Node *parent;
+            static void _register_methods();
+
+            State();
+
+            ~State();
+
+            /**
+             * @brief Initialize the class from Godot.
+             * @details This method is called just once when the Godot engine connects to the instance of the class.
+             */
+            virtual void _init();
+
+            virtual void _state_enter(const String state, const Array args = Array());
+
+            virtual void _state_exit(const String state, const Array args = Array());
+
+            virtual void set_parent(Node *new_parent) final;
+
+            virtual Node *get_parent() final;
+
+            virtual void set_state_machine(StateMachine *new_state_machine) final;
+
+            virtual StateMachine *get_state_machine() final;
+    };
+}
+
+#endif

src/state_machine/StateMachine.cpp

@@ -0,0 +1,208 @@
+#include "StateMachine.h"
+#include "State.h"
+
+using namespace godot;
+
+void StateMachine::_register_methods()
+{
+    register_method("_ready", &StateMachine::_ready);
+    register_method("_on_StateMachine_tree_entered", &StateMachine::_on_StateMachine_tree_entered);
+    register_method("_on_StateMachine_tree_exiting", &StateMachine::_on_StateMachine_tree_exiting);
+    register_property<StateMachine, String>("default_state", &StateMachine::set_default_state, &StateMachine::get_default_state, String());
+    register_property<StateMachine, bool>("debug", &StateMachine::set_debug, &StateMachine::get_debug, false);
+    register_signal<StateMachine>("state_entered", "state", GODOT_VARIANT_TYPE_STRING);
+    register_signal<StateMachine>("state_exited", "state", GODOT_VARIANT_TYPE_STRING);
+    register_signal<StateMachine>("state_restarted", "state", GODOT_VARIANT_TYPE_STRING);
+}
+
+StateMachine::StateMachine()
+{
+}
+
+StateMachine::~StateMachine()
+{
+}
+
+void StateMachine::_init()
+{
+    set_default_state(String());
+    set_debug(false);
+}
+
+void StateMachine::_ready()
+{
+    connect("tree_entered", this, "_on_StateMachine_tree_entered");
+    connect("tree_exiting", this, "_on_StateMachine_tree_exiting");
+    parent = get_parent();
+    set_current_state(get_default_state());
+    setup();
+}
+
+void StateMachine::setup()
+{
+    auto children = get_children();
+
+    if (get_current_state() == "")
+    {
+        if (children.size() > 0)
+        {
+            WARN_PRINT("State machine doesn't have a default state set, using first child!");
+            auto child = Object::cast_to<Node>(children[0].operator Object*());
+            set_current_state(child->get_name());
+        }
+        else
+        {
+            ERR_PRINT("State machine doesn't have a default state set and has no child states!");
+            return;
+        }
+    }
+
+    for (uint8_t i = 0; i < children.size(); i++)
+    {
+        auto child = Object::cast_to<Node>(children[i].operator Object*());
+        add_state(child->get_name(), child);
+
+        child->call("set_state_machine", this);
+
+        child->call("set_parent", parent);
+
+        if (child->get_name() != get_current_state())
+        {
+            this->remove_child(child);
+        }
+    }
+
+    this->call("_state_enter", get_current_state());
+}
+
+void StateMachine::add_state(const String state, Node *child)
+{
+    states[state] = child;
+}
+
+bool StateMachine::is_current(const String state)
+{
+    if (get_current_state() == "")
+    {
+        return false;
+    }
+    else
+    {
+        return get_current_state() == state;
+    }
+}
+
+bool StateMachine::has(const String state)
+{
+    return states.has(state);
+}
+
+void StateMachine::restart(const String state, const Array& args)
+{
+    this->call("_state_exit", state, args);
+    this->call("_state_enter", state, args);
+    this->emit_signal("state_restarted", get_current_state());
+}
+
+void StateMachine::change(const String state, const Array &args)
+{
+    if (is_current(state))
+    {
+        return this->restart(state, args);
+    }
+
+    auto previous_state = get_current_state();
+    auto exiting = this->call("_state_exit", state, args);
+
+    if (get_current_state() != "")
+    {
+        auto child = Object::cast_to<Node>(states[get_current_state()].operator Object*());
+        if (child != nullptr)
+        {
+            this->remove_child(child);
+        }
+        this->emit_signal("state_exited", get_current_state());
+        if (debug)
+        {
+            Godot::print(get_current_state() + " exited!");
+        }
+    }
+
+    set_current_state(state);
+    auto child = Object::cast_to<Node>(states[get_current_state()].operator Object*());
+    this->add_child(child);
+
+    this->call("_state_enter", previous_state, args);
+    this->emit_signal("state_entered", get_current_state());
+    if (debug)
+    {
+        Godot::print(get_current_state() + " entered!");
+    }
+}
+
+Variant StateMachine::call(const String method, const Array &args)
+{
+    auto node = Object::cast_to<Node>(states[get_current_state()].operator Object*());
+    if (node != nullptr)
+    {
+        return node->call(method, args);
+    }
+    return Variant();
+}
+
+Variant StateMachine::_call(const String method, const Array &args)
+{
+    return this->call(method, args);
+}
+
+void StateMachine::set_default_state(const String new_default_state)
+{
+    default_state = new_default_state;
+}
+
+String StateMachine::get_default_state()
+{
+    return default_state;
+}
+
+void StateMachine::set_current_state(const String new_current_sate)
+{
+    current_state = new_current_sate;
+}
+
+String StateMachine::get_current_state()
+{
+    return current_state;
+}
+
+void StateMachine::set_debug(bool debug)
+{
+    this->debug = debug;
+}
+
+bool StateMachine::get_debug()
+{
+    return this->debug;
+}
+
+void StateMachine::_on_StateMachine_tree_entered()
+{
+    setup();
+}
+
+void StateMachine::_on_StateMachine_tree_exiting()
+{
+    auto keys = states.keys();
+    for (uint8_t i = 0; i < keys.size(); i++)
+    {
+        auto child = Object::cast_to<Node>(states[keys[i]].operator Object*());
+        if (child != nullptr)
+        {
+            auto children = get_children();
+            if (!children.has(child))
+            {
+                this->add_child(child);
+            }
+        }
+    }
+}

src/state_machine/StateMachine.h

@@ -0,0 +1,95 @@
+#ifndef JUEGO_STATE_MACHINE_H
+#define JUEGO_STATE_MACHINE_H
+
+#include <Godot.hpp>
+#include <Node.hpp>
+
+namespace godot
+{
+    class StateMachine : public Node
+    {
+        GODOT_CLASS(StateMachine, Node)
+
+        private:
+            Node *parent;
+            String default_state;
+            bool debug;
+            String current_state;
+            Dictionary states;
+
+            void add_state(const String state, Node *child);
+
+        public:
+            static void _register_methods();
+
+            StateMachine();
+
+            ~StateMachine();
+
+            /**
+             * @brief Initialize the class from Godot.
+             * @details This method is called just once when the Godot engine connects to the instance of the class.
+             */
+            void _init();
+
+            /**
+             * @brief Code to be run when ready.
+             * @details This method is run when all the children of this node are ready.
+             */
+            void _ready();
+
+            void setup();
+
+            bool is_current();
+
+            bool is_current(const String state);
+
+            bool has(const String state);
+
+            void restart(const String state, const Array& args = Array());
+
+            void change(const String state, const Array &args = Array());
+
+            Variant call(const String method, const Array &args = Array());
+
+            Variant _call(const String method, const Array &args = Array());
+
+            template <class ...Args> Variant restart(Args ...args)
+            {
+                return restart(Array::make(args...));
+            }
+
+            template <class ...Args> Variant change(const String state, Args ...args)
+            {
+                return change(state, Array::make(args...));
+            }
+
+            template <class ...Args> Variant call(const String method, Args ...args)
+            {
+                return call(method, Array::make(args...));
+            }
+
+            template <class ...Args> Variant _call(const String method, Args ...args)
+            {
+                return _call(method, Array::make(args...));
+            }
+
+            void set_default_state(const String new_default_state);
+
+            String get_default_state();
+
+            void set_debug(bool debug);
+
+            bool get_debug();
+
+            void set_current_state(const String new_current_state);
+
+            String get_current_state();
+
+            void _on_StateMachine_tree_entered();
+
+            void _on_StateMachine_tree_exiting();
+    };
+}
+
+#endif