17 files changed, 520 insertions, 182 deletions

@@ -0,0 +1,35 @@
+#include "animation.h"
+
+AnimationSet::AnimationSet(
+  Texture texture,
+  int frameWidth,
+  int frameHeight,
+  int framesAcross) :
+    texture_(std::move(texture)),
+    frameWidth_(frameWidth),
+    frameHeight_(frameHeight),
+    framesAcross_(framesAcross)
+{
+}
+
+void AnimationSet::emplaceAnimation(
+  std::string animation,
+  size_t firstFrame,
+  size_t numFrames,
+  size_t delay)
+{
+  animations_.emplace(
+    std::piecewise_construct,
+    std::make_tuple(animation),
+    std::make_tuple(firstFrame, numFrames, delay));
+}
+
+Rectangle AnimationSet::getFrameRect(int frame) const
+{
+  return {
+    frameWidth_ * (frame % framesAcross_),
+    frameHeight_ * (frame / framesAcross_),
+    frameWidth_,
+    frameHeight_
+  };
+}
@@ -0,0 +1,100 @@
+#ifndef ANIMATION_H_74EB0901
+#define ANIMATION_H_74EB0901
+
+#include "renderer.h"
+#include <string>
+#include <map>
+#include <stdexcept>
+
+class Animation {
+public:
+
+  Animation(
+    size_t firstFrame,
+    size_t numFrames,
+    size_t delay) :
+      firstFrame_(firstFrame),
+      numFrames_(numFrames),
+      delay_(delay)
+  {
+  }
+
+  inline size_t getFirstFrame() const
+  {
+    return firstFrame_;
+  }
+
+  inline size_t getNumFrames() const
+  {
+    return numFrames_;
+  }
+
+  inline size_t getDelay() const
+  {
+    return delay_;
+  }
+
+private:
+
+  size_t firstFrame_;
+  size_t numFrames_;
+  size_t delay_;
+};
+
+class AnimationSet {
+public:
+
+  AnimationSet(
+    Texture texture,
+    int frameWidth,
+    int frameHeight,
+    int framesAcross);
+
+  void emplaceAnimation(
+    std::string animation,
+    size_t firstFrame,
+    size_t numFrames,
+    size_t delay);
+
+  inline const Animation& getAnimation(std::string animation) const
+  {
+    if (!animations_.count(animation))
+    {
+      throw std::invalid_argument("Animation does not exist");
+    }
+
+    return animations_.at(animation);
+  }
+
+  inline const Texture& getTexture() const
+  {
+    return texture_;
+  }
+
+  inline int getFrameWidth() const
+  {
+    return frameWidth_;
+  }
+
+  inline int getFrameHeight() const
+  {
+    return frameHeight_;
+  }
+
+  inline int getFramesAcross() const
+  {
+    return framesAcross_;
+  }
+
+  Rectangle getFrameRect(int frame) const;
+
+private:
+
+  std::map<std::string, Animation> animations_;
+  Texture texture_;
+  int frameWidth_;
+  int frameHeight_;
+  int framesAcross_;
+};
+
+#endif /* end of include guard: ANIMATION_H_74EB0901 */
@@ -1,27 +0,0 @@
-#include "animatable.h"
-
-AnimatableComponent::AnimatableComponent(const char* filename, int frame_width, int frame_height, int frames_across)
-  : texture(filename), frame_width(frame_width), frame_height(frame_height), frames_across(frames_across)
-{
-  
-}
-
-int AnimatableComponent::getFrame() const
-{
-  return frame;
-}
-
-void AnimatableComponent::setFrame(int frame)
-{
-  this->frame = frame;
-}
-
-const Texture& AnimatableComponent::getTexture() const
-{
-  return texture;
-}
-
-Rectangle AnimatableComponent::getFrameRect() const
-{
-  return {frame_width * (frame % frames_across), frame_height * (frame / frames_across), frame_width, frame_height};
-}
@@ -2,30 +2,61 @@
 #define SPRITE_RENDERABLE_H_D3AACBBF
 
 #include "component.h"
-#include "renderer.h"
-#include "direction.h"
+#include "animation.h"
+#include <string>
 
 class AnimatableComponent : public Component {
-  public:
-    AnimatableComponent(const char* filename, int frame_width, int frame_height, int frames_across);
-    
-    int getFrame() const;
-    void setFrame(int frame);
-    
-    const Texture& getTexture() const;
-    Rectangle getFrameRect() const;
-    
-    void setDirection(Direction dir) {};
-    void setWalking(bool w) {};
-    void setJumping(bool w) {};
-    void setCrouching(bool w) {};
-    
-  private:
-    Texture texture;
-    int frame_width;
-    int frame_height;
-    int frames_across;
-    int frame = 0;
+public:
+
+  AnimatableComponent(
+    AnimationSet animationSet,
+    std::string animation) :
+      animationSet_(std::move(animationSet)),
+      animation_(std::move(animation))
+  {
+  }
+
+  inline size_t getFrame() const
+  {
+    return frame_;
+  }
+
+  inline void setFrame(size_t v)
+  {
+    frame_ = v;
+  }
+
+  inline size_t getCountdown() const
+  {
+    return countdown_;
+  }
+
+  inline void setCountdown(size_t v)
+  {
+    countdown_ = v;
+  }
+
+  inline const AnimationSet& getAnimationSet() const
+  {
+    return animationSet_;
+  }
+
+  inline const Animation& getAnimation() const
+  {
+    return animationSet_.getAnimation(animation_);
+  }
+
+  inline void setAnimation(std::string animation)
+  {
+    animation_ = std::move(animation);
+  }
+
+private:
+
+  AnimationSet animationSet_;
+  std::string animation_;
+  size_t frame_ = 0;
+  size_t countdown_ = 0;
 };
 
 #endif /* end of include guard: SPRITE_RENDERABLE_H_D3AACBBF */
@@ -0,0 +1,24 @@
+#ifndef ORIENTABLE_H_EDB6C4A1
+#define ORIENTABLE_H_EDB6C4A1
+
+#include "component.h"
+
+class OrientableComponent : public Component {
+public:
+
+  inline bool isFacingRight() const
+  {
+    return facingRight_;
+  }
+
+  inline void setFacingRight(bool v)
+  {
+    facingRight_ = v;
+  }
+
+private:
+
+  bool facingRight_ = false;
+};
+
+#endif /* end of include guard: ORIENTABLE_H_EDB6C4A1 */
@@ -6,6 +6,13 @@
 class PonderableComponent : public Component {
 public:
 
+  enum class state {
+    grounded,
+    jumping,
+    falling,
+    dropping
+  };
+
   inline double getVelocityX() const
   {
     return velX_;
@@ -51,12 +58,18 @@ public:
     return state_;
   }
 
+  inline void setState(state arg)
+  {
+    state_ = arg;
+  }
+
 private:
 
   double velX_ = 0.0;
   double velY_ = 0.0;
   double accelX_ = 0.0;
   double accelY_ = 0.0;
+  state state_ = state::grounded;
 };
 
 #endif /* end of include guard: TANGIBLE_H_746DB3EE */
@@ -4,40 +4,59 @@
 #include "components/controllable.h"
 #include "components/droppable.h"
 #include "components/ponderable.h"
+#include "components/orientable.h"
 #include "systems/rendering.h"
 #include "systems/controlling.h"
 #include "systems/pondering.h"
+#include "systems/animating.h"
+#include "animation.h"
 
 void key_callback(GLFWwindow* window, int key, int, int action, int)
 {
   Game& game = *((Game*) glfwGetWindowUserPointer(window));
-  
+
   if ((action == GLFW_PRESS) && (key == GLFW_KEY_ESCAPE))
   {
-    game.shouldQuit = true;
-    
+    game.shouldQuit_ = true;
+
     return;
   }
-  
-  game.systemManager.getSystem<ControllingSystem>().input(key, action);
+
+  game.systemManager_.getSystem<ControllingSystem>().input(key, action);
 }
 
-Game::Game(GLFWwindow* window) : window(window)
+Game::Game(GLFWwindow* window) : window_(window)
 {
-  systemManager.emplaceSystem<ControllingSystem>(*this);
-  systemManager.emplaceSystem<RenderingSystem>(*this);
-  systemManager.emplaceSystem<PonderingSystem>(*this);
-  
-  int player = entityManager.emplaceEntity();
-  entityManager.emplaceComponent<AnimatableComponent>(player, "res/Starla.png", 10, 12, 6);
-  entityManager.emplaceComponent<TransformableComponent>(player, 203, 44, 10, 12);
-  entityManager.emplaceComponent<DroppableComponent>(player);
-  entityManager.emplaceComponent<PonderableComponent>(player);
-  entityManager.emplaceComponent<ControllableComponent>(player);
-  
+  systemManager_.emplaceSystem<ControllingSystem>(*this);
+  systemManager_.emplaceSystem<PonderingSystem>(*this);
+  systemManager_.emplaceSystem<RenderingSystem>(*this);
+  systemManager_.emplaceSystem<AnimatingSystem>(*this);
+
+  int player = entityManager_.emplaceEntity();
+
+  AnimationSet playerGraphics {"res/Starla2.bmp", 10, 12, 6};
+  playerGraphics.emplaceAnimation("stillLeft", 3, 1, 1);
+  playerGraphics.emplaceAnimation("stillRight", 0, 1, 1);
+  playerGraphics.emplaceAnimation("walkingLeft", 4, 2, 10);
+  playerGraphics.emplaceAnimation("walkingRight", 1, 2, 10);
+
+  entityManager_.emplaceComponent<AnimatableComponent>(
+    player,
+    std::move(playerGraphics),
+    "stillLeft");
+
+  entityManager_.emplaceComponent<TransformableComponent>(
+    player,
+    203, 44, 10, 12);
+
+  entityManager_.emplaceComponent<DroppableComponent>(player);
+  entityManager_.emplaceComponent<PonderableComponent>(player);
+  entityManager_.emplaceComponent<ControllableComponent>(player);
+  entityManager_.emplaceComponent<OrientableComponent>(player);
+
   glfwSwapInterval(1);
-  glfwSetWindowUserPointer(window, this);
-  glfwSetKeyCallback(window, key_callback);
+  glfwSetWindowUserPointer(window_, this);
+  glfwSetKeyCallback(window_, key_callback);
 }
 
 void Game::execute()
@@ -46,7 +65,7 @@ void Game::execute()
   const double dt = 0.01;
   double accumulator = 0.0;
 
-  while (!(shouldQuit || glfwWindowShouldClose(window)))
+  while (!(shouldQuit_ || glfwWindowShouldClose(window_)))
   {
     double currentTime = glfwGetTime();
     double frameTime = currentTime - lastTime;
@@ -57,19 +76,13 @@ void Game::execute()
     accumulator += frameTime;
     while (accumulator >= dt)
     {
-      systemManager.getSystem<ControllingSystem>().tick(dt);
-      systemManager.getSystem<PonderingSystem>().tick(dt);
+      systemManager_.getSystem<ControllingSystem>().tick(dt);
+      systemManager_.getSystem<PonderingSystem>().tick(dt);
+      systemManager_.getSystem<AnimatingSystem>().tick(dt);
 
       accumulator -= dt;
     }
 
-    systemManager.getSystem<RenderingSystem>().tick(frameTime);
+    systemManager_.getSystem<RenderingSystem>().tick(frameTime);
   }
 }
-
-EntityManager& Game::getEntityManager()
-{
-  return entityManager;
-}
-
-
@@ -6,19 +6,35 @@
 #include "system_manager.h"
 
 class Game {
-  public:
-    Game(GLFWwindow* window);
+public:
 
-    void execute();
-    EntityManager& getEntityManager();
+  Game(GLFWwindow* window);
 
-    friend void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
+  void execute();
 
-  private:
-    EntityManager entityManager;
-    SystemManager systemManager;
-    GLFWwindow* const window;
-    bool shouldQuit = false;
+  inline EntityManager& getEntityManager()
+  {
+    return entityManager_;
+  }
+
+  inline SystemManager& getSystemManager()
+  {
+    return systemManager_;
+  }
+
+  friend void key_callback(
+    GLFWwindow* window,
+    int key,
+    int scancode,
+    int action,
+    int mods);
+
+private:
+
+  EntityManager entityManager_;
+  SystemManager systemManager_;
+  GLFWwindow* const window_;
+  bool shouldQuit_ = false;
 };
 
 #endif /* end of include guard: GAME_H_1014DDC9 */
@@ -1,12 +1,18 @@
 #ifndef SYSTEM_H_B61A8CEA
 #define SYSTEM_H_B61A8CEA
 
+#include "entity_manager.h"
+
 class Game;
 
 class System {
 public:
-  System(Game& game)
-    : game(game) {}
+
+  using id_type = EntityManager::id_type;
+
+  System(Game& game) : game_(game)
+  {
+  }
 
   virtual ~System() = default;
 
@@ -14,7 +20,7 @@ public:
 
 protected:
 
-  Game& game;
+  Game& game_;
 };
 
 #endif /* end of include guard: SYSTEM_H_B61A8CEA */
@@ -0,0 +1,38 @@
+#include "animating.h"
+#include "game.h"
+#include "components/animatable.h"
+
+void AnimatingSystem::tick(double)
+{
+  std::set<id_type> spriteEntities =
+    game_.getEntityManager().getEntitiesWithComponents<AnimatableComponent>();
+
+  for (id_type entity : spriteEntities)
+  {
+    auto& sprite = game_.getEntityManager().
+      getComponent<AnimatableComponent>(entity);
+
+    sprite.setCountdown(sprite.getCountdown() + 1);
+
+    const Animation& anim = sprite.getAnimation();
+    if (sprite.getCountdown() >= anim.getDelay())
+    {
+      sprite.setFrame(sprite.getFrame() + 1);
+      sprite.setCountdown(0);
+
+      if (sprite.getFrame() >= anim.getFirstFrame() + anim.getNumFrames())
+      {
+        sprite.setFrame(anim.getFirstFrame());
+      }
+    }
+  }
+}
+
+void AnimatingSystem::startAnimation(id_type entity, std::string animation)
+{
+  auto& sprite = game_.getEntityManager().
+    getComponent<AnimatableComponent>(entity);
+
+  sprite.setAnimation(animation);
+  sprite.setFrame(sprite.getAnimation().getFirstFrame());
+}
@@ -0,0 +1,20 @@
+#ifndef ANIMATING_H_5BBF0094
+#define ANIMATING_H_5BBF0094
+
+#include "system.h"
+#include <string>
+
+class AnimatingSystem : public System {
+public:
+
+  AnimatingSystem(Game& game) : System(game)
+  {
+  }
+
+  void tick(double dt);
+
+  void startAnimation(id_type entity, std::string animation);
+
+};
+
+#endif /* end of include guard: ANIMATING_H_5BBF0094 */
@@ -4,21 +4,30 @@
 #include "components/ponderable.h"
 #include "components/animatable.h"
 #include "components/droppable.h"
+#include "components/orientable.h"
+#include "systems/animating.h"
 #include "direction.h"
 #include "muxer.h"
 #include "consts.h"
 
-void ControllingSystem::tick(double dt)
+void ControllingSystem::tick(double)
 {
-  while (!actions.empty())
+  while (!actions_.empty())
   {
-    int key = actions.front().first;
-    int action = actions.front().second;
+    int key = actions_.front().first;
+    int action = actions_.front().second;
+
+    auto entities = game_.getEntityManager().getEntitiesWithComponents<
+      ControllableComponent,
+      PonderableComponent,
+      AnimatableComponent,
+      DroppableComponent,
+      OrientableComponent>();
 
-    auto entities = game.getEntityManager().getEntitiesWithComponents<ControllableComponent, PonderableComponent, AnimatableComponent, DroppableComponent>();
     for (auto entity : entities)
     {
-      auto& controllable = game.getEntityManager().getComponent<ControllableComponent>(entity);
+      auto& controllable = game_.getEntityManager().
+        getComponent<ControllableComponent>(entity);
 
       if (action == GLFW_PRESS)
       {
@@ -95,74 +104,107 @@ void ControllingSystem::tick(double dt)
       }
     }
 
-    actions.pop();
+    actions_.pop();
   }
 }
 
 void ControllingSystem::input(int key, int action)
 {
-  actions.push(std::make_pair(key, action));
+  actions_.push(std::make_pair(key, action));
 }
 
-void ControllingSystem::walkLeft(int entity)
+void ControllingSystem::walkLeft(id_type entity)
 {
-  auto& ponderable = game.getEntityManager().getComponent<PonderableComponent>(entity);
-  auto& animatable = game.getEntityManager().getComponent<AnimatableComponent>(entity);
-  
+  auto& ponderable = game_.getEntityManager().getComponent<PonderableComponent>(entity);
+  auto& orientable = game_.getEntityManager().getComponent<OrientableComponent>(entity);
+
+  orientable.setFacingRight(false);
   ponderable.setVelocityX(-90);
-  
-  animatable.setDirection(Direction::Left);
-  animatable.setWalking(true);
+
+  auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+
+  if (ponderable.getState() == PonderableComponent::state::grounded)
+  {
+    animating.startAnimation(entity, "walkingLeft");
+  } else {
+    animating.startAnimation(entity, "stillLeft");
+  }
 }
 
-void ControllingSystem::walkRight(int entity)
+void ControllingSystem::walkRight(id_type entity)
 {
-  auto& ponderable = game.getEntityManager().getComponent<PonderableComponent>(entity);
-  auto& animatable = game.getEntityManager().getComponent<AnimatableComponent>(entity);
-  
+  auto& ponderable = game_.getEntityManager().getComponent<PonderableComponent>(entity);
+  auto& orientable = game_.getEntityManager().getComponent<OrientableComponent>(entity);
+
+  orientable.setFacingRight(true);
   ponderable.setVelocityX(90);
 
-  animatable.setDirection(Direction::Right);
-  animatable.setWalking(true);
+  auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+
+  if (ponderable.getState() == PonderableComponent::state::grounded)
+  {
+    animating.startAnimation(entity, "walkingRight");
+  } else {
+    animating.startAnimation(entity, "stillRight");
+  }
 }
 
-void ControllingSystem::stopWalking(int entity)
+void ControllingSystem::stopWalking(id_type entity)
 {
-  auto& ponderable = game.getEntityManager().getComponent<PonderableComponent>(entity);
-  auto& animatable = game.getEntityManager().getComponent<AnimatableComponent>(entity);
-  
+  auto& ponderable = game_.getEntityManager().getComponent<PonderableComponent>(entity);
+  auto& orientable = game_.getEntityManager().getComponent<OrientableComponent>(entity);
+
   ponderable.setVelocityX(0);
-  
-  animatable.setWalking(false);
+
+  if (ponderable.getState() == PonderableComponent::state::grounded)
+  {
+    auto& animating = game_.getSystemManager().getSystem<AnimatingSystem>();
+
+    if (orientable.isFacingRight())
+    {
+      animating.startAnimation(entity, "stillRight");
+    } else {
+      animating.startAnimation(entity, "stillLeft");
+    }
+  }
 }
 
-void ControllingSystem::jump(int entity)
+void ControllingSystem::jump(id_type entity)
 {
-  auto& ponderable = game.getEntityManager().getComponent<PonderableComponent>(entity);
-  auto& animatable = game.getEntityManager().getComponent<AnimatableComponent>(entity);
-  
-  playSound("res/Randomize87.wav", 0.25);
-
-  ponderable.setVelocityY(JUMP_VELOCITY(TILE_HEIGHT*4.5, 0.3));
-  ponderable.setAccelY(JUMP_GRAVITY(TILE_HEIGHT*4.5, 0.3));
-  
-  animatable.setJumping(true);
+  auto& ponderable = game_.getEntityManager().getComponent<PonderableComponent>(entity);
+
+  if (ponderable.getState() == PonderableComponent::state::grounded)
+  {
+    playSound("res/Randomize87.wav", 0.25);
+
+    ponderable.setVelocityY(JUMP_VELOCITY(TILE_HEIGHT*4.5, 0.3));
+    ponderable.setAccelY(JUMP_GRAVITY(TILE_HEIGHT*4.5, 0.3));
+    ponderable.setState(PonderableComponent::state::jumping);
+  }
 }
 
-void ControllingSystem::stopJumping(int entity)
+void ControllingSystem::stopJumping(id_type entity)
 {
-  auto& ponderable = game.getEntityManager().getComponent<PonderableComponent>(entity);
-  auto& animatable = game.getEntityManager().getComponent<AnimatableComponent>(entity);
-  
-  ponderable.setAccelY(JUMP_GRAVITY(TILE_HEIGHT*3.5, 0.233));
-  animatable.setJumping(false);
+  auto& ponderable = game_.getEntityManager().getComponent<PonderableComponent>(entity);
+
+  if (ponderable.getState() == PonderableComponent::state::jumping)
+  {
+    ponderable.setAccelY(JUMP_GRAVITY(TILE_HEIGHT*3.5, 0.233));
+    ponderable.setState(PonderableComponent::state::falling);
+  }
 }
 
-void ControllingSystem::drop(int entity, bool start)
+void ControllingSystem::drop(id_type entity, bool start)
 {
-  auto& animatable = game.getEntityManager().getComponent<AnimatableComponent>(entity);
-  auto& droppable = game.getEntityManager().getComponent<DroppableComponent>(entity);
-  
+  auto& droppable = game_.getEntityManager().getComponent<DroppableComponent>(entity);
+  auto& ponderable = game_.getEntityManager().getComponent<PonderableComponent>(entity);
+
+  if (start && (ponderable.getState() == PonderableComponent::state::grounded))
+  {
+    ponderable.setState(PonderableComponent::state::dropping);
+  } else if ((!start) && (ponderable.getState() == PonderableComponent::state::dropping))
+  {
+    ponderable.setState(PonderableComponent::state::grounded);
+  }
   droppable.setDroppable(start);
-  animatable.setCrouching(start);
 }
@@ -3,24 +3,28 @@
 
 #include "system.h"
 #include <queue>
+#include "entity_manager.h"
 
 class ControllingSystem : public System {
-  public:
-    ControllingSystem(Game& game)
-      : System(game) {}
-
-    void tick(double dt);
-    void input(int key, int action);
-
-  private:
-    void walkLeft(int entity);
-    void walkRight(int entity);
-    void stopWalking(int entity);
-    void jump(int entity);
-    void stopJumping(int entity);
-    void drop(int entity, bool start);
-
-    std::queue<std::pair<int,int>> actions;
+public:
+
+  ControllingSystem(Game& game) : System(game)
+  {
+  }
+
+  void tick(double dt);
+  void input(int key, int action);
+
+private:
+
+  void walkLeft(id_type entity);
+  void walkRight(id_type entity);
+  void stopWalking(id_type entity);
+  void jump(id_type entity);
+  void stopJumping(id_type entity);
+  void drop(id_type entity, bool start);
+
+  std::queue<std::pair<int,int>> actions_;
 };
 
 #endif /* end of include guard: CONTROLLING_H_80B1BB8D */
@@ -5,12 +5,14 @@
 
 void PonderingSystem::tick(double dt)
 {
-  auto entities = game.getEntityManager().getEntitiesWithComponents<PonderableComponent, TransformableComponent>();
+  auto entities = game_.getEntityManager().getEntitiesWithComponents<
+    PonderableComponent,
+    TransformableComponent>();
 
-  for (auto entity : entities)
+  for (id_type entity : entities)
   {
-    auto& transformable = game.getEntityManager().getComponent<TransformableComponent>(entity);
-    auto& ponderable = game.getEntityManager().getComponent<PonderableComponent>(entity);
+    auto& transformable = game_.getEntityManager().getComponent<TransformableComponent>(entity);
+    auto& ponderable = game_.getEntityManager().getComponent<PonderableComponent>(entity);
 
     // Accelerate
     ponderable.setVelocityX(ponderable.getVelocityX() + ponderable.getAccelX() * dt);
@@ -4,11 +4,13 @@
 #include "system.h"
 
 class PonderingSystem : public System {
-  public:
-    PonderingSystem(Game& game)
-      : System(game) {}
+public:
 
-    void tick(double dt);
+  PonderingSystem(Game& game) : System(game)
+  {
+  }
+
+  void tick(double dt);
 };
 
 #endif /* end of include guard: PONDERING_H_F2530E0E */
@@ -3,19 +3,35 @@
 #include "components/animatable.h"
 #include "components/transformable.h"
 
-void RenderingSystem::tick(double dt)
+void RenderingSystem::tick(double)
 {
-  texture.fill(texture.entirety(), 0, 0, 0);
-  
-  std::set<int> spriteEntities = game.getEntityManager().getEntitiesWithComponents<AnimatableComponent, TransformableComponent>();
-  for (int entity : spriteEntities)
+  texture_.fill(texture_.entirety(), 0, 0, 0);
+
+  std::set<id_type> spriteEntities =
+    game_.getEntityManager().getEntitiesWithComponents<
+      AnimatableComponent,
+      TransformableComponent>();
+
+  for (id_type entity : spriteEntities)
   {
-    auto& sprite = game.getEntityManager().getComponent<AnimatableComponent>(entity);
-    auto& transform = game.getEntityManager().getComponent<TransformableComponent>(entity);
-    Rectangle dstrect {(int) transform.getX(), (int) transform.getY(), transform.getW(), transform.getH()};
-    
-    texture.blit(sprite.getTexture(), sprite.getFrameRect(), dstrect);
+    auto& sprite = game_.getEntityManager().
+      getComponent<AnimatableComponent>(entity);
+
+    auto& transform = game_.getEntityManager().
+      getComponent<TransformableComponent>(entity);
+
+    Rectangle dstrect {
+      static_cast<int>(transform.getX()),
+      static_cast<int>(transform.getY()),
+      transform.getW(),
+      transform.getH()};
+
+    const AnimationSet& aset = sprite.getAnimationSet();
+    texture_.blit(
+      aset.getTexture(),
+      aset.getFrameRect(sprite.getFrame()),
+      dstrect);
   }
-  
-  texture.renderScreen();
+
+  texture_.renderScreen();
 }
@@ -6,14 +6,17 @@
 #include "consts.h"
 
 class RenderingSystem : public System {
-  public:
-    RenderingSystem(Game& game)
-      : System(game) {}
+public:
 
-    void tick(double dt);
+  RenderingSystem(Game& game) : System(game)
+  {
+  }
 
-  private:
-    Texture texture {GAME_WIDTH, GAME_HEIGHT};
+  void tick(double dt);
+
+private:
+
+  Texture texture_ {GAME_WIDTH, GAME_HEIGHT};
 };
 
 #endif /* end of include guard: RENDERING_H_76ABC02A */