commit ac521c3129cc7d6cda602a998ae5cd5643ab6b50
Author: NaiJi <naijiworld@protonmail.com>
Date:   Sat Jan 9 13:41:58 2021 +0300

    Init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..94bcf1c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.ogg
+*.png
+*user*
diff --git a/application.cpp b/application.cpp
new file mode 100644
index 0000000..1fc7a7c
--- /dev/null
+++ b/application.cpp
@@ -0,0 +1,37 @@
+#include "application.h"
+#include "game.h"
+
+constexpr int SCREEN_WIDTH   = 640;
+constexpr int SCREEN_HEIGHT  = 480;
+const sf::Time TIME_PER_SECOND = sf::seconds(1.f / 60.f);
+
+Application::Application() :
+    render_window({SCREEN_WIDTH, SCREEN_HEIGHT}, "Test")
+{}
+
+void Application::registerStates()
+{
+    map_states[State::Tag::Game] = std::make_unique<Game>(render_window, this);
+
+    active_state_tag = State::Tag::Game;
+}
+
+void Application::run()
+{
+    sf::Clock clock;
+    sf::Time since_last_update = sf::Time::Zero;
+
+    while (render_window.isOpen())
+    {
+        map_states[active_state_tag]->processInput();
+        sf::Time delta = clock.restart();
+
+        since_last_update -= TIME_PER_SECOND;
+        map_states[active_state_tag]->processInput();
+
+        //if (!b_pause)
+            map_states[active_state_tag]->update(delta);
+
+        map_states[active_state_tag]->draw();
+    }
+}
diff --git a/application.h b/application.h
new file mode 100644
index 0000000..a9743eb
--- /dev/null
+++ b/application.h
@@ -0,0 +1,23 @@
+#ifndef APPLICATION_H
+#define APPLICATION_H
+
+#include "state.h"
+#include <memory>
+#include <map>
+
+class Application
+{
+public:
+    Application();
+
+    void registerStates();
+    void run();
+
+private:
+    sf::RenderWindow render_window;
+
+    std::map<State::Tag, StateUPtr> map_states;
+    State::Tag active_state_tag;
+};
+
+#endif // APPLICATION_H
diff --git a/command.h b/command.h
new file mode 100644
index 0000000..f754cdb
--- /dev/null
+++ b/command.h
@@ -0,0 +1,36 @@
+#ifndef COMMAND_H
+#define COMMAND_H
+
+#include <functional>
+
+namespace Category
+{
+    enum Type
+    {
+        None   = 0,
+        Scene  = 1 << 0,
+        Player = 1 << 1,
+        Enemy  = 1 << 2
+    };
+}
+
+class SceneNode;
+namespace sf { class Time; }
+
+struct Command
+{
+    std::function<void(SceneNode&, sf::Time)> action;
+    Category::Type category;
+};
+
+template<typename GameObject, typename Functon>
+std::function<void(SceneNode&, const sf::Time&)> derivedAction(Functon func)
+{
+    return [=] (SceneNode& node, const sf::Time& time)
+    {
+        //assert(dynamic_cast<GameObject*>(&node));
+        func(static_cast<GameObject&>(node), time);
+    };
+}
+
+#endif // COMMAND_H
diff --git a/danmaku.pro b/danmaku.pro
new file mode 100644
index 0000000..1299662
--- /dev/null
+++ b/danmaku.pro
@@ -0,0 +1,31 @@
+TEMPLATE = app
+CONFIG += c++17
+CONFIG -= app_bundle
+CONFIG -= qt
+
+SOURCES += \
+        application.cpp \
+        entity.cpp \
+        enemy.cpp \
+        game.cpp \
+        main.cpp \
+        player.cpp \
+        scenenode.cpp \
+        spritenode.cpp \
+        state.cpp \
+        world.cpp
+
+HEADERS += \
+    application.h \
+    command.h \
+    entity.h \
+    enemy.h \
+    game.h \
+    player.h \
+    resourceholder.h \
+    scenenode.h \
+    spritenode.h \
+    state.h \
+    world.h
+
+unix:LIBS += -lsfml-graphics -lsfml-audio -lsfml-window -lsfml-system
diff --git a/enemy.cpp b/enemy.cpp
new file mode 100644
index 0000000..4899ced
--- /dev/null
+++ b/enemy.cpp
@@ -0,0 +1,48 @@
+#include "enemy.h"
+
+// /////////////////////////////////////////////////////////// //
+
+static Textures::Id toTextureID(const Enemy::Type& type)
+{
+    switch (type)
+    {
+    case Enemy::Type::Shotguner:
+        return Textures::Id::Shotguner;
+
+    case Enemy::Type::Weakling:
+        return Textures::Id::Weakling;
+
+    case Enemy::Type::Player:
+        return Textures::Id::Player;
+    }
+
+    return Textures::Id::Weakling;
+}
+
+// /////////////////////////////////////////////////////////// //
+
+Enemy::Enemy(Type type, const TextureHolder& texture_holder) :
+    enemy_type(type),
+    enemy_sprite(texture_holder.get(toTextureID(type)))
+{
+    const sf::FloatRect bounds = enemy_sprite.getLocalBounds();
+    enemy_sprite.setOrigin(bounds.width / 2.f, bounds.height / 2.f);
+}
+
+Enemy::~Enemy()
+{}
+
+Enemy::Type Enemy::type() const
+{
+    return enemy_type;
+}
+
+Category::Type Enemy::category() const
+{
+    return Category::Type::Enemy;
+}
+
+void Enemy::drawCurrent(sf::RenderTarget& target, sf::RenderStates states) const
+{
+    target.draw(enemy_sprite, states);
+}
diff --git a/enemy.h b/enemy.h
new file mode 100644
index 0000000..1c0f924
--- /dev/null
+++ b/enemy.h
@@ -0,0 +1,36 @@
+#ifndef FAIRY_H
+#define FAIRY_H
+
+#include "entity.h"
+#include "resourceholder.h"
+
+#include <SFML/Graphics/Sprite.hpp>
+
+class Enemy : public Entity
+{
+public:
+
+    enum class Type
+    {
+        Player,
+        Weakling,
+        Shotguner
+    };
+
+    explicit Enemy(Type type, const TextureHolder& texture_holder);
+    virtual ~Enemy() override;
+
+    Type type() const;
+    Category::Type category() const override;
+
+private:
+    Type enemy_type;
+    sf::Sprite enemy_sprite;
+
+    virtual void drawCurrent(sf::RenderTarget& target, sf::RenderStates states) const override;
+};
+
+using EnemySPtr = std::shared_ptr<Enemy>;
+using EnemyUPtr = std::unique_ptr<Enemy>;
+
+#endif // FAIRY_H
diff --git a/entity.cpp b/entity.cpp
new file mode 100644
index 0000000..bf220f5
--- /dev/null
+++ b/entity.cpp
@@ -0,0 +1,34 @@
+#include "entity.h"
+
+Entity::Entity() :
+    vector_velocity(0.f, 0.f)
+{}
+
+Entity::~Entity()
+{}
+
+void Entity::setVelocity(sf::Vector2f vel)
+{
+    vector_velocity = vel;
+}
+
+void Entity::setVelocity(float vx, float vy)
+{
+    vector_velocity.x = vx;
+    vector_velocity.y = vy;
+}
+
+const sf::Vector2f& Entity::velocity() const
+{
+    return vector_velocity;
+}
+
+void Entity::accelerate(sf::Vector2f vel)
+{
+    vector_velocity += vel;
+}
+
+void Entity::updateCurrent(const sf::Time& dt)
+{
+    move(vector_velocity * dt.asSeconds());
+}
diff --git a/entity.h b/entity.h
new file mode 100644
index 0000000..c67bf7c
--- /dev/null
+++ b/entity.h
@@ -0,0 +1,26 @@
+#ifndef ENTITY_H
+#define ENTITY_H
+
+#include "scenenode.h"
+
+#include <SFML/System.hpp>
+
+class Entity : public SceneNode
+{
+public:
+    explicit Entity();
+    virtual ~Entity() = 0;
+
+    void setVelocity(sf::Vector2f vel);
+    void setVelocity(float vx, float vy);
+    const sf::Vector2f& velocity() const;
+    void accelerate(sf::Vector2f vel);
+
+
+private:
+    sf::Vector2f vector_velocity;
+
+    virtual void updateCurrent(const sf::Time& dt) override;
+};
+
+#endif // ENTITY_H
diff --git a/game.cpp b/game.cpp
new file mode 100644
index 0000000..41b8c91
--- /dev/null
+++ b/game.cpp
@@ -0,0 +1,57 @@
+#include "game.h"
+
+Game::Game(sf::RenderWindow &window, Application *application) :
+    State(window, application),
+    world(render_window)
+{}
+
+Game::~Game()
+{}
+
+bool Game::processInput()
+{
+    std::queue<Command>& queue = world.getCommandQueue();
+
+    sf::Event event;
+    while (render_window.pollEvent(event))
+    {
+        player.handleEvent(event, queue);
+
+        switch (event.type)
+        {
+        case sf::Event::GainedFocus:
+            b_pause = false;
+            break;
+
+        case sf::Event::LostFocus:
+            b_pause = true;
+            break;
+
+        case sf::Event::Closed:
+            render_window.close();
+            break;
+
+        default:
+            break;
+        }
+    }
+
+    player.handleRealtimeInput(queue);
+
+    return true;
+}
+
+bool Game::update(const sf::Time &dt)
+{
+    world.update(dt);
+
+    return true;
+}
+
+void Game::draw()
+{
+    render_window.clear();
+    world.draw();
+    render_window.setView(render_window.getDefaultView());
+    render_window.display();
+}
diff --git a/game.h b/game.h
new file mode 100644
index 0000000..c174b46
--- /dev/null
+++ b/game.h
@@ -0,0 +1,31 @@
+#ifndef GAME_H
+#define GAME_H
+
+#include "world.h"
+#include "player.h"
+#include "state.h"
+
+#include <SFML/Graphics/RenderWindow.hpp>
+#include <SFML/Window/Keyboard.hpp>
+
+class Game final : public State
+{
+public:
+    Game(sf::RenderWindow& window, Application *application);
+    virtual ~Game() override;
+
+    void run();
+
+private:
+    World world;
+    Player player;
+
+    bool b_pause;
+    bool b_to_right, b_to_left, b_to_up, b_to_down;
+
+    bool processInput() override;
+    bool update(const sf::Time& dt) override;
+    void draw() override;
+};
+
+#endif // GAME_H
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..55c251b
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,8 @@
+#include "application.h"
+
+int main()
+{
+    Application app;
+    app.registerStates();
+    app.run();
+}
diff --git a/player.cpp b/player.cpp
new file mode 100644
index 0000000..81e5599
--- /dev/null
+++ b/player.cpp
@@ -0,0 +1,57 @@
+#include "player.h"
+#include "command.h"
+#include "enemy.h"
+
+Player::Player() :
+    player_speed(45.f)
+{
+    map_key_bindings[sf::Keyboard::Left] = Action::MoveLeft;
+    map_key_bindings[sf::Keyboard::Right] = Action::MoveRight;
+    map_key_bindings[sf::Keyboard::Up] = Action::MoveUp;
+    map_key_bindings[sf::Keyboard::Down] = Action::MoveDown;
+
+    map_action_bindings[Action::MoveLeft].action =
+            [&] (SceneNode& node, const sf::Time& time)
+            {
+                node.move(-player_speed * time.asSeconds(), 0.f);
+            };
+
+    map_action_bindings[Action::MoveRight].action =
+            [&] (SceneNode& node, const sf::Time& time)
+            {
+                node.move(player_speed * time.asSeconds(), 0.f);
+            };
+
+    map_action_bindings[Action::MoveUp].action =
+            [&] (SceneNode& node, const sf::Time& time)
+            {
+                node.move(0.f, -player_speed * time.asSeconds());
+            };
+
+    map_action_bindings[Action::MoveDown].action =
+            [&] (SceneNode& node, const sf::Time& time)
+            {
+                node.move(0.f, player_speed * time.asSeconds());
+            };
+
+    for (auto& pair : map_action_bindings)
+        pair.second.category = Category::Enemy;
+}
+
+void Player::handleRealtimeInput(std::queue<Command>& queue)
+{
+    for (const auto& pair : map_key_bindings)
+        if (sf::Keyboard::isKeyPressed(pair.first) && isRealtime(pair.second))
+            queue.push(map_action_bindings[pair.second]);
+}
+
+void Player::handleEvent(const sf::Event &event, std::queue<Command> &queue)
+{
+    switch (event.type)
+    {
+    case sf::Event::KeyPressed:
+        break;
+    default:
+        break;
+    }
+}
diff --git a/player.h b/player.h
new file mode 100644
index 0000000..afd281a
--- /dev/null
+++ b/player.h
@@ -0,0 +1,37 @@
+#ifndef PLAYER_H
+#define PLAYER_H
+
+#include <queue>
+#include <map>
+#include <SFML/Window/Event.hpp>
+
+class Command;
+
+class Player
+{
+public:
+    Player();
+
+    enum class Action
+    {
+        MoveLeft,
+        MoveRight,
+        MoveUp,
+        MoveDown
+    };
+
+    void assignKey(Action action, sf::Keyboard::Key key);
+    sf::Keyboard::Key getAssignedKey(Action action) const;
+
+    void handleEvent(const sf::Event& event, std::queue<Command>& queue);
+    void handleRealtimeInput(std::queue<Command>& queue);
+
+private:
+    float player_speed;
+    std::map<sf::Keyboard::Key, Action> map_key_bindings;
+    std::map<Action, Command> map_action_bindings;
+
+    static bool isRealtime(Action action) {return true;}
+};
+
+#endif // PLAYER_H
diff --git a/resourceholder.h b/resourceholder.h
new file mode 100644
index 0000000..5c220f5
--- /dev/null
+++ b/resourceholder.h
@@ -0,0 +1,55 @@
+#ifndef RESOURCEHOLDER_H
+#define RESOURCEHOLDER_H
+
+#include <assert.h>
+#include <string>
+#include <memory>
+#include <map>
+
+namespace sf { class Texture; class Font; }
+
+template <typename Resource, typename Id>
+class ResourceHolder
+{
+public:
+    bool load(Id id, const std::string& filename)
+    {
+        std::unique_ptr<Resource> resource(new Resource());
+        if (!resource->loadFromFile(filename))
+            return false;
+
+        map_resources[id] = std::move(resource);
+
+        return true;
+    }
+
+    Resource& get(Id id) const
+    {
+        const auto found = map_resources.find(id);
+        assert(found != map_resources.end());
+
+        return *found->second;
+    }
+
+private:
+    std::map<Id, std::unique_ptr<Resource>> map_resources;
+};
+
+// /////////////////////////////////////////////////////////// //
+
+namespace Textures
+{
+    enum class Id
+    {
+        Player,
+        Weakling,
+        Shotguner,
+
+        Background
+    };
+}
+
+using TextureHolder = ResourceHolder<sf::Texture, Textures::Id>;
+using FontHolder = ResourceHolder<sf::Font, Textures::Id>;
+
+#endif // RESOURCEHOLDER_H
diff --git a/scenenode.cpp b/scenenode.cpp
new file mode 100644
index 0000000..d1d5a9d
--- /dev/null
+++ b/scenenode.cpp
@@ -0,0 +1,92 @@
+#include "scenenode.h"
+#include <algorithm>
+
+SceneNode::SceneNode()
+{}
+
+SceneNode::~SceneNode()
+{}
+
+bool SceneNode::attachChild(const SceneNodeSPtr &child)
+{
+    child->parent = shared_from_this();
+    vec_children.emplace_back(std::move(child));
+
+    return true;
+}
+
+SceneNodeSPtr SceneNode::detachChild(const SceneNode &node)
+{
+    const auto found = std::find_if(vec_children.begin(), vec_children.end(),
+                                    [&] (SceneNodeSPtr& p) -> bool
+                                    {
+                                        return p.get() == &node;
+                                    });
+
+    if (found == vec_children.end())
+        return nullptr;
+
+    SceneNodeSPtr result = *found;
+    result->parent = nullptr;
+    vec_children.erase(found);
+
+    return result;
+}
+
+sf::Transform SceneNode::getWorldTransform() const
+{
+    sf::Transform transform = sf::Transform::Identity;
+
+    for (SceneNodeConstSPtr node = shared_from_this(); node != nullptr; node = node->parent)
+    {
+        transform *= node->getTransform();
+    }
+
+    return transform;
+}
+
+sf::Vector2f SceneNode::getWorldPosition() const
+{
+    return getWorldTransform() * sf::Vector2f();
+}
+
+void SceneNode::draw(sf::RenderTarget& target, sf::RenderStates states) const
+{
+    states.transform *= getTransform();
+    drawCurrent(target, states);
+
+    for (const auto& ch : vec_children)
+        ch->draw(target, states);
+}
+
+void SceneNode::update(const sf::Time& dt)
+{
+    updateCurrent(dt);
+    updateChildren(dt);
+}
+
+void SceneNode::onCommand(const Command& command, const sf::Time& dt)
+{
+    if (command.category & category())
+        command.action(*shared_from_this(), dt);
+
+    for (auto& ch : vec_children)
+        ch->onCommand(command, dt);
+}
+
+Category::Type SceneNode::category() const
+{
+    return Category::Type::Scene;
+}
+
+void SceneNode::drawCurrent(sf::RenderTarget& target, sf::RenderStates states) const
+{}
+
+void SceneNode::updateCurrent(const sf::Time& dt)
+{}
+
+void SceneNode::updateChildren(const sf::Time &dt)
+{
+    for (SceneNodeSPtr& child : vec_children)
+        child->update(dt);
+}
diff --git a/scenenode.h b/scenenode.h
new file mode 100644
index 0000000..b5c9313
--- /dev/null
+++ b/scenenode.h
@@ -0,0 +1,45 @@
+#ifndef SCENENODE_H
+#define SCENENODE_H
+
+#include "command.h"
+#include <vector>
+#include <memory>
+#include <SFML/Graphics.hpp>
+
+class SceneNode;
+using SceneNodeUPtr = std::unique_ptr<SceneNode>;
+using SceneNodeSPtr = std::shared_ptr<SceneNode>;
+using SceneNodeConstSPtr = std::shared_ptr<const SceneNode>;
+
+class SceneNode : public std::enable_shared_from_this<SceneNode>,
+        public sf::Transformable,
+        public sf::Drawable,
+        private sf::NonCopyable
+{
+public:
+    explicit SceneNode();
+    virtual ~SceneNode();
+
+    bool attachChild(const SceneNodeSPtr &child);
+    SceneNodeSPtr detachChild(const SceneNode& node);
+
+    sf::Transform getWorldTransform() const;
+    sf::Vector2f  getWorldPosition() const;
+
+    void update(const sf::Time& dt);
+    void onCommand(const Command& command, const sf::Time& dt);
+
+    virtual Category::Type category() const;
+
+private:
+    std::vector<SceneNodeSPtr> vec_children;
+    SceneNodeSPtr parent;
+
+    virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const override final;
+    virtual void drawCurrent(sf::RenderTarget& target, sf::RenderStates states) const;
+    virtual void updateCurrent(const sf::Time& dt);
+
+    void updateChildren(const sf::Time& dt);
+};
+
+#endif // SCENENODE_H
diff --git a/spritenode.cpp b/spritenode.cpp
new file mode 100644
index 0000000..8f40449
--- /dev/null
+++ b/spritenode.cpp
@@ -0,0 +1,20 @@
+#include "spritenode.h"
+
+SpriteNode::SpriteNode(const sf::Texture& texture)
+{
+    sprite.setTexture(texture);
+}
+
+SpriteNode::~SpriteNode()
+{}
+
+SpriteNode::SpriteNode(const sf::Texture& texture, const sf::IntRect& rect)
+{
+    sprite.setTexture(texture);
+    sprite.setTextureRect(rect);
+}
+
+void SpriteNode::drawCurrent(sf::RenderTarget& target, sf::RenderStates states) const
+{
+    target.draw(sprite, states);
+}
diff --git a/spritenode.h b/spritenode.h
new file mode 100644
index 0000000..8a398d6
--- /dev/null
+++ b/spritenode.h
@@ -0,0 +1,22 @@
+#ifndef SPRITENODE_H
+#define SPRITENODE_H
+
+#include "scenenode.h"
+
+class SpriteNode : public SceneNode
+{
+public:
+    explicit SpriteNode(const sf::Texture& texture);
+    explicit SpriteNode(const sf::Texture& texture,
+                        const sf::IntRect& rect);
+    virtual ~SpriteNode();
+
+private:
+    sf::Sprite sprite;
+    virtual void drawCurrent(sf::RenderTarget& target, sf::RenderStates states) const;
+};
+
+using SpriteNodeUPtr = std::unique_ptr<SpriteNode>;
+using SpriteNodeSPtr = std::shared_ptr<SpriteNode>;
+
+#endif // SPRITENODE_H
diff --git a/state.cpp b/state.cpp
new file mode 100644
index 0000000..8d041d7
--- /dev/null
+++ b/state.cpp
@@ -0,0 +1,9 @@
+#include "state.h"
+
+State::State(sf::RenderWindow &window, Application *application) :
+    render_window(window),
+    app(application)
+{}
+
+State::~State()
+{}
diff --git a/state.h b/state.h
new file mode 100644
index 0000000..0cc132d
--- /dev/null
+++ b/state.h
@@ -0,0 +1,35 @@
+#ifndef STATE_H
+#define STATE_H
+
+#include <SFML/System.hpp>
+#include <SFML/Graphics/RenderWindow.hpp>
+#include <SFML/Window/Event.hpp>
+#include <memory>
+
+class Application;
+
+class State
+{
+public:
+    explicit State(sf::RenderWindow& window, Application *application);
+    virtual ~State() = 0;
+
+    virtual void draw() = 0;
+    virtual bool update(const sf::Time& dt) = 0;
+    virtual bool processInput() = 0;
+
+    enum class Tag
+    {
+        Menu,
+        Game
+    };
+
+protected:
+    sf::RenderWindow& render_window;
+    Application *app;
+};
+
+using StateUPtr = std::unique_ptr<State>;
+using StateSPtr = std::shared_ptr<State>;
+
+#endif // STATE_H
diff --git a/world.cpp b/world.cpp
new file mode 100644
index 0000000..69d6e9d
--- /dev/null
+++ b/world.cpp
@@ -0,0 +1,84 @@
+#include "world.h"
+#include "spritenode.h"
+#include "enemy.h"
+#include <cmath>
+
+World::World(sf::RenderWindow& window) :
+    world_window(window),
+    world_view(window.getDefaultView()),
+    scene_graph(new SceneNode()),
+    world_bounds(0.f, 0.f, world_view.getSize().x, 2000.f),
+    world_spawn_pos(world_view.getSize().x / 2.f, world_bounds.height - world_view.getSize().y),
+    player(nullptr)
+{
+    loadTextures();
+    buildScene();
+
+    world_view.setCenter(world_spawn_pos);
+}
+
+void World::update(const sf::Time &dt)
+{
+    world_view.move(0.f, world_speed * dt.asSeconds());
+    player->setVelocity(0.f, 0.f);
+
+    while (!queue_commands.empty())
+    {
+        scene_graph->onCommand(queue_commands.front(), dt);
+        queue_commands.pop();
+    }
+
+    //sf::Vector2f position = player->getPosition();
+    sf::Vector2f velocity = player->velocity();
+
+    if (velocity.x != 0.f && velocity.y != 0.f)
+        player->setVelocity(velocity / std::sqrt(2.f));
+
+    player->accelerate({0.f, world_speed});
+
+    scene_graph->update(dt);
+}
+
+void World::draw()
+{
+    world_window.setView(world_view);
+    world_window.draw(*scene_graph);
+}
+
+std::queue<Command>& World::getCommandQueue()
+{
+    return queue_commands;
+}
+
+bool World::loadTextures()
+{
+    return /*texture_holder.load(Textures::Id::Weakling, "sprite_weakling.png")
+        && texture_holder.load(Textures::Id::Shotguner, "sprite_shotguner.png")
+        && */texture_holder.load(Textures::Id::Background, "sprite_back.png")
+        && texture_holder.load(Textures::Id::Player, "sprite.png");
+}
+
+void World::buildScene()
+{
+    for (std::size_t i = 0; i < LayerCount; ++i)
+    {
+        SceneNodeSPtr layer(new SceneNode());
+        arr_layers[i] = layer;
+
+        scene_graph->attachChild(layer);
+    }
+
+    sf::Texture texture = texture_holder.get(Textures::Id::Background);
+    sf::IntRect texture_rect(world_bounds);
+    texture.setRepeated(true);
+
+    SpriteNodeSPtr background_sprite(new SpriteNode(texture, texture_rect));
+    background_sprite->setPosition(world_bounds.left, world_bounds.top);
+
+    arr_layers[Background]->attachChild(background_sprite);
+
+    player = std::make_shared<Enemy>(Enemy::Type::Player, texture_holder);
+    player->setPosition(world_spawn_pos);
+    player->setVelocity(40.f, world_speed);
+    arr_layers[Air]->attachChild(player);
+}
diff --git a/world.h b/world.h
new file mode 100644
index 0000000..6f48770
--- /dev/null
+++ b/world.h
@@ -0,0 +1,46 @@
+#ifndef WORLD_H
+#define WORLD_H
+
+#include "enemy.h"
+#include "resourceholder.h"
+#include "scenenode.h"
+#include <queue>
+#include <SFML/System.hpp>
+#include <SFML/Graphics/RenderWindow.hpp>
+
+class World : private sf::NonCopyable
+{
+public:
+    explicit World(sf::RenderWindow& window);
+
+    void update(const sf::Time& dt);
+    void draw();
+
+    std::queue<Command>& getCommandQueue();
+
+private:
+    bool loadTextures();
+    void buildScene();
+
+    enum Layer
+    {
+        Background,
+        Air,
+        LayerCount
+    };
+
+    std::queue<Command> queue_commands;
+
+    sf::RenderWindow& world_window;
+    sf::View world_view;
+    TextureHolder texture_holder;
+    SceneNodeSPtr scene_graph;
+    std::array<SceneNodeSPtr, LayerCount> arr_layers;
+
+    sf::FloatRect world_bounds;
+    sf::Vector2f world_spawn_pos;
+    float world_speed;
+    EnemySPtr player;
+};
+
+#endif // WORLD_H