Merge pull request #7 from hatkirby/es-rewrite

The ECS rewrite exceeds the original branch in functionality, so it is time to merge it in.

29 files changed, 736 insertions, 1054 deletions

@@ -1,142 +0,0 @@
-#include "ai.h"
-#include <cstdlib>
-#include "entity.h"
-
-void AIActionContainer::addAction(std::shared_ptr<AIAction> action)
-{
-  actions.push_back(action);
-}
-
-void AIActionContainer::start(Game& game, Entity& entity)
-{
-  currentAction = begin(actions);
-  
-  if (currentAction != end(actions))
-  {
-    (*currentAction)->start(game, entity);
-  }
-}
-
-void AIActionContainer::perform(Game& game, Entity& entity, double dt)
-{
-  if (!isDone())
-  {
-    (*currentAction)->perform(game, entity, dt);
-  
-    if ((*currentAction)->isDone())
-    {
-      currentAction++;
-      
-      if (!isDone())
-      {
-        (*currentAction)->start(game, entity);
-      }
-    }
-  }
-}
-
-bool AIActionContainer::isDone() const
-{
-  return currentAction == end(actions);
-}
-
-AI::AI(int chance)
-{
-  this->chance = chance;
-}
-
-int AI::getChance() const
-{
-  return chance;
-}
-
-AI& AIComponent::emplaceAI(int chance)
-{
-  maxChance += chance;
-  ais.emplace_back(chance);
-  
-  return ais.back();
-}
-
-void AIComponent::tick(Game& game, Entity& entity, double dt)
-{
-  if (currentAI == nullptr)
-  {
-    int toChoose = rand() % maxChance;
-    for (auto& ai : ais)
-    {
-      if (toChoose < ai.getChance())
-      {
-        currentAI = &ai;
-        break;
-      } else {
-        toChoose -= ai.getChance();
-      }
-    }
-    
-    if (currentAI != nullptr)
-    {
-      currentAI->start(game, entity);
-    }
-  }
-  
-  if (currentAI != nullptr)
-  {
-    currentAI->perform(game, entity, dt);
-  
-    if (currentAI->isDone())
-    {
-      currentAI = nullptr;
-    }
-  }
-}
-
-MoveAIAction::MoveAIAction(Direction dir, int len, int speed)
-{
-  this->dir = dir;
-  this->len = len;
-  this->speed = speed;
-}
-
-void MoveAIAction::start(Game& game, Entity& entity)
-{
-  remaining = len;
-}
-
-void MoveAIAction::perform(Game&, Entity& entity, double dt)
-{
-  double dist = dt * speed;
-  remaining -= dist;
-  
-  switch (dir)
-  {
-    case Direction::Left:
-    {
-      entity.position.first -= dist;
-      break;
-    }
-    
-    case Direction::Right:
-    {
-      entity.position.first += dist;
-      break;
-    }
-    
-    case Direction::Up:
-    {
-      entity.position.second -= dist;
-      break;
-    }
-    
-    case Direction::Down:
-    {
-      entity.position.second += dist;
-      break;
-    }
-  }
-}
-
-bool MoveAIAction::isDone() const
-{
-  return remaining <= 0.0;
-}
@@ -1,73 +0,0 @@
-#ifndef AI_H
-#define AI_H
-
-#include <list>
-#include <map>
-#include <string>
-#include <memory>
-
-#include "entity.h"
-
-class AIAction {
-  public:
-    virtual void start(Game& game, Entity& entity) = 0;
-    virtual void perform(Game& game, Entity& entity, double dt) = 0;
-    virtual bool isDone() const = 0;
-};
-
-class AIActionContainer {
-  public:
-    void addAction(std::shared_ptr<AIAction> action);
-    virtual void start(Game& game, Entity& entity);
-    virtual void perform(Game& game, Entity& entity, double dt);
-    virtual bool isDone() const;
-  
-  private:
-    std::list<std::shared_ptr<AIAction>> actions;
-    std::list<std::shared_ptr<AIAction>>::iterator currentAction {end(actions)};
-};
-
-class AI : public AIActionContainer {
-  public:
-    AI(int chance);
-    
-    int getChance() const;
-    
-  private:
-    int chance;
-};
-
-class AIComponent : public Component {
-  public:
-    AI& emplaceAI(int chance);
-    void tick(Game& game, Entity& entity, double dt);
-
-  private:
-    int maxChance = 0;
-    std::list<AI> ais;
-    AI* currentAI = nullptr;
-};
-
-class MoveAIAction : public AIAction {
-  public:
-    enum class Direction {
-      Left,
-      Right,
-      Up,
-      Down
-    };
-    
-    MoveAIAction(Direction dir, int len, int speed);
-    
-    void start(Game& game, Entity& entity);
-    void perform(Game& game, Entity& entity, double dt);
-    bool isDone() const;
-    
-  private:
-    Direction dir;
-    int len;
-    int speed;
-    double remaining;
-};
-
-#endif /* end of include guard: AI_H */
@@ -0,0 +1,93 @@
+#ifndef SPRITE_RENDERABLE_H_D3AACBBF
+#define SPRITE_RENDERABLE_H_D3AACBBF
+
+#include "component.h"
+#include "animation.h"
+#include <string>
+
+class AnimatableComponent : public Component {
+public:
+
+  /**
+   * Constructor for initializing the animation set, because it is not default
+   * constructible.
+   */
+  AnimatableComponent(
+    AnimationSet animationSet) :
+      animationSet(std::move(animationSet))
+  {
+  }
+
+  /**
+   * The animation set that this entity will use -- an object describing the
+   * different animations that can be used to render the entity.
+   *
+   * @managed_by RealizingSystem
+   */
+  AnimationSet animationSet;
+
+  /**
+   * The name of the currently active animation.
+   *
+   * @managed_by AnimatingSystem
+   */
+  std::string animation;
+
+  /**
+   * For prototypes, the name of the original animation.
+   *
+   * @managed_by RealizingSystem
+   */
+  std::string origAnimation;
+
+  /**
+   * Helper method for accessing the currently active animation.
+   */
+  inline const Animation& getAnimation() const
+  {
+    return animationSet.getAnimation(animation);
+  }
+
+  /**
+   * The frame of animation that is currently being rendered.
+   *
+   * @managed_by AnimatingSystem
+   */
+  size_t frame = 0;
+
+  /**
+   * The amount of time (in game frames) before the animation is advanced.
+   *
+   * @managed_by AnimatingSystem
+   */
+  size_t countdown = 0;
+
+  /**
+   * This option allows to give the sprite a "flickering" effect (as in, it is
+   * not rendered in some frames).
+   */
+  bool flickering = false;
+
+  /**
+   * Used for the flickering effect.
+   *
+   * @managed_by AnimatingSystem
+   */
+  size_t flickerTimer = 0;
+
+  /**
+   * If enabled, this will prevent the sprite's animation from progressing (but
+   * will not affect things such as placement on screen and flickering).
+   */
+  bool frozen = false;
+
+  /**
+   * If this flag is disabled, the entity will be ignored by the animating
+   * system.
+   *
+   * @managed_by RealizingSystem
+   */
+  bool active = false;
+};
+
+#endif /* end of include guard: SPRITE_RENDERABLE_H_D3AACBBF */
@@ -0,0 +1,34 @@
+#ifndef AUTOMATABLE_H_FACB42A5
+#define AUTOMATABLE_H_FACB42A5
+
+#include "component.h"
+#include "entity_manager.h"
+
+class AutomatableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  /**
+   * Controls what script will be run as this entity's behavior. It should refer
+   * to a table in the global namespace of the script engine state, and that
+   * table should contain a function called "Behavior".
+   */
+  std::string table;
+
+  /**
+   * Whether or not the behavior script is running.
+   *
+   * @managed_by ScriptingSystem
+   */
+  bool running = false;
+
+  /**
+   * The entity ID of the running script, if there is one.
+   *
+   * @managed_by ScriptingSystem
+   */
+  id_type script;
+};
+
+#endif /* end of include guard: AUTOMATABLE_H_FACB42A5 */
@@ -0,0 +1,92 @@
+#ifndef CONTROLLABLE_H_4E0B85B4
+#define CONTROLLABLE_H_4E0B85B4
+
+#include "component.h"
+#include "renderer/gl.h"
+
+class ControllableComponent : public Component {
+public:
+
+  inline int getLeftKey() const
+  {
+    return leftKey_;
+  }
+
+  inline void setLeftKey(int k)
+  {
+    leftKey_ = k;
+  }
+
+  inline int getRightKey() const
+  {
+    return rightKey_;
+  }
+
+  inline void setRightKey(int k)
+  {
+    rightKey_ = k;
+  }
+
+  inline int getJumpKey() const
+  {
+    return jumpKey_;
+  }
+
+  inline void setJumpKey(int k)
+  {
+    jumpKey_ = k;
+  }
+
+  inline int getDropKey() const
+  {
+    return dropKey_;
+  }
+
+  inline void setDropKey(int k)
+  {
+    dropKey_ = k;
+  }
+
+  inline bool isFrozen() const
+  {
+    return frozen_;
+  }
+
+  inline void setFrozen(bool f)
+  {
+    frozen_ = f;
+  }
+
+  inline bool isHoldingLeft() const
+  {
+    return holdingLeft_;
+  }
+
+  inline void setHoldingLeft(bool f)
+  {
+    holdingLeft_ = f;
+  }
+
+  inline bool isHoldingRight() const
+  {
+    return holdingRight_;
+  }
+
+  inline void setHoldingRight(bool f)
+  {
+    holdingRight_ = f;
+  }
+
+private:
+
+  int leftKey_ = GLFW_KEY_LEFT;
+  int rightKey_ = GLFW_KEY_RIGHT;
+  int jumpKey_ = GLFW_KEY_UP;
+  int dropKey_ = GLFW_KEY_DOWN;
+
+  bool frozen_ = false;
+  bool holdingLeft_ = false;
+  bool holdingRight_ = false;
+};
+
+#endif /* end of include guard: CONTROLLABLE_H_4E0B85B4 */
@@ -1,241 +0,0 @@
-#include "map_collision.h"
-#include "map.h"
-#include "game.h"
-#include "consts.h"
-
-MapCollisionComponent::MapCollisionComponent(const Map& map) : map(map)
-{
-  addCollision(-6, 0, MAP_HEIGHT*TILE_HEIGHT, Direction::left, collisionFromMoveType(map.getAdjacent(Map::MoveDir::Left).type));
-  addCollision(GAME_WIDTH+6, 0, MAP_HEIGHT*TILE_HEIGHT, Direction::right, collisionFromMoveType(map.getAdjacent(Map::MoveDir::Right).type));
-  addCollision(-6, 0, GAME_WIDTH, Direction::up, collisionFromMoveType(map.getAdjacent(Map::MoveDir::Up).type));
-  addCollision(MAP_HEIGHT*TILE_HEIGHT+6, 0, GAME_WIDTH, Direction::down, collisionFromMoveType(map.getAdjacent(Map::MoveDir::Down).type));
-  
-  for (int i=0; i<MAP_WIDTH*MAP_HEIGHT; i++)
-  {
-    int x = i % MAP_WIDTH;
-    int y = i / MAP_WIDTH;
-    int tile = map.getMapdata()[i];
-    
-    if ((tile > 0) && (tile < 28) && (!((tile >= 5) && (tile <= 7))))
-    {
-      addCollision(x*TILE_WIDTH, y*TILE_HEIGHT, (y+1)*TILE_HEIGHT, Direction::right, Collision::Type::wall);
-      addCollision((x+1)*TILE_WIDTH, y*TILE_HEIGHT, (y+1)*TILE_HEIGHT, Direction::left, Collision::Type::wall);
-      addCollision(y*TILE_HEIGHT, x*TILE_WIDTH, (x+1)*TILE_WIDTH, Direction::down, Collision::Type::wall);
-      addCollision((y+1)*TILE_HEIGHT, x*TILE_WIDTH, (x+1)*TILE_WIDTH, Direction::up, Collision::Type::wall);
-    } else if ((tile >= 5) && (tile <= 7))
-    {
-      addCollision(y*TILE_HEIGHT, x*TILE_WIDTH, (x+1)*TILE_WIDTH, Direction::down, Collision::Type::platform);
-    } else if (tile == 42)
-    {
-      addCollision(y*TILE_HEIGHT, x*TILE_WIDTH, (x+1)*TILE_WIDTH, Direction::down, Collision::Type::danger);
-    }
-  }
-}
-
-void MapCollisionComponent::addCollision(double axis, double lower, double
-   upper, Direction dir, Collision::Type type)
-{
-  std::list<Collision>::iterator it;
-  
-  switch (dir)
-  {
-    case Direction::up:
-      it = up_collisions.begin();
-      for (; it!=up_collisions.end(); it++)
-      {
-        if (it->axis < axis) break;
-      }
-    
-      up_collisions.insert(it, {axis, lower, upper, type});
-      
-      break;
-    case Direction::down:
-      it = down_collisions.begin();
-      for (; it!=down_collisions.end(); it++)
-      {
-        if (it->axis > axis) break;
-      }
-    
-      down_collisions.insert(it, {axis, lower, upper, type});
-      
-      break;
-    case Direction::left:
-      it = left_collisions.begin();
-      for (; it!=left_collisions.end(); it++)
-      {
-        if (it->axis < axis) break;
-      }
-  
-      left_collisions.insert(it, {axis, lower, upper, type});
-      
-      break;
-    case Direction::right:
-      it = right_collisions.begin();
-      for (; it!=right_collisions.end(); it++)
-      {
-        if (it->axis > axis) break;
-      }
-  
-      right_collisions.insert(it, {axis, lower, upper, type});
-      
-      break;
-  }
-}
-
-void MapCollisionComponent::detectCollision(Game& game, Entity&, Entity& collider, std::pair<double, double> old_position)
-{
-  if (collider.position.first < old_position.first)
-  {
-    for (auto collision : left_collisions)
-    {
-      if (collision.axis > old_position.first) continue;
-      if (collision.axis < collider.position.first) break;
-  
-      if ((old_position.second+collider.size.second > collision.lower) && (old_position.second < collision.upper))
-      {
-        // We have a collision!
-        processCollision(game, collider, collision, Direction::left, old_position);
-    
-        break;
-      }
-    }
-  } else if (collider.position.first > old_position.first)
-  {
-    for (auto collision : right_collisions)
-    {
-      if (collision.axis < old_position.first+collider.size.first) continue;
-      if (collision.axis > collider.position.first+collider.size.first) break;
-  
-      if ((old_position.second+collider.size.second > collision.lower) && (old_position.second < collision.upper))
-      {
-        // We have a collision!
-        processCollision(game, collider, collision, Direction::right, old_position);
-    
-        break;
-      }
-    }
-  }
-  
-  if (collider.position.second < old_position.second)
-  {
-    for (auto collision : up_collisions)
-    {
-      if (collision.axis > old_position.second) continue;
-      if (collision.axis < collider.position.second) break;
-  
-      if ((collider.position.first+collider.size.first > collision.lower) && (collider.position.first < collision.upper))
-      {
-        // We have a collision!
-        processCollision(game, collider, collision, Direction::up, old_position);
-    
-        break;
-      }
-    }
-  } else if (collider.position.second > old_position.second)
-  {
-    for (auto collision : down_collisions)
-    {
-      if (collision.axis < old_position.second+collider.size.second) continue;
-      if (collision.axis > collider.position.second+collider.size.second) break;
-
-      if ((collider.position.first+collider.size.first > collision.lower) && (collider.position.first < collision.upper))
-      {
-        // We have a collision!
-        processCollision(game, collider, collision, Direction::down, old_position);
-        
-        break;
-      }
-    }
-  }
-}
-
-void MapCollisionComponent::processCollision(Game& game, Entity& collider, Collision collision, Direction dir, std::pair<double, double> old_position)
-{
-  if (collision.type == Collision::Type::wall)
-  {
-    if (dir == Direction::left)
-    {
-      collider.position.first = collision.axis;
-      
-      Message msg(Message::Type::setHorizontalVelocity);
-      msg.velocity = 0.0;
-      collider.send(game, msg);
-    } else if (dir == Direction::right)
-    {
-      collider.position.first = collision.axis - collider.size.first;
-
-      Message msg(Message::Type::setHorizontalVelocity);
-      msg.velocity = 0.0;
-      collider.send(game, msg);
-    } else if (dir == Direction::up)
-    {
-      collider.position.second = collision.axis;
-
-      Message msg(Message::Type::setVerticalVelocity);
-      msg.velocity = 0.0;
-      collider.send(game, msg);
-    } else if (dir == Direction::down)
-    {
-      collider.position.second = collision.axis - collider.size.second;
-      collider.send(game, Message::Type::hitTheGround);
-    }
-  } else if (collision.type == Collision::Type::wrap)
-  {
-    if (dir == Direction::left)
-    {
-      collider.position.first = GAME_WIDTH-collider.size.first/2;
-    } else if (dir == Direction::right)
-    {
-      collider.position.first = -collider.size.first/2;
-    } else if (dir == Direction::up)
-    {
-      collider.position.second = GAME_HEIGHT-collider.size.second/2-1;
-    } else if (dir == Direction::down)
-    {
-      collider.position.second = -collider.size.second/2;
-    }
-  } else if (collision.type == Collision::Type::teleport)
-  {
-    if (dir == Direction::left)
-    {
-      game.loadMap(game.getWorld().getMap(map.getAdjacent(Map::MoveDir::Left).map), std::make_pair(GAME_WIDTH-collider.size.first/2, old_position.second));
-    } else if (dir == Direction::right)
-    {
-      game.loadMap(game.getWorld().getMap(map.getAdjacent(Map::MoveDir::Right).map), std::make_pair(-collider.size.first/2, old_position.second));
-    } else if (dir == Direction::up)
-    {
-      game.loadMap(game.getWorld().getMap(map.getAdjacent(Map::MoveDir::Up).map), std::make_pair(old_position.first, MAP_HEIGHT*TILE_HEIGHT-collider.size.second/2));
-    } else if (dir == Direction::down)
-    {
-      game.loadMap(game.getWorld().getMap(map.getAdjacent(Map::MoveDir::Down).map), std::make_pair(old_position.first, -collider.size.second/2));
-    }
-  } else if (collision.type == Collision::Type::reverse)
-  {
-    // TODO reverse
-    if (dir == Direction::right)
-    {
-      collider.position.first = collision.axis - collider.size.first;
-      collider.send(game, Message::Type::walkLeft);
-    }
-  } else if (collision.type == Collision::Type::platform)
-  {
-    Message msg(Message::Type::drop);
-    msg.dropAxis = collision.axis;
-
-    collider.send(game, msg);
-  } else if (collision.type == Collision::Type::danger)
-  {
-    game.playerDie();
-  }
-}
-
-MapCollisionComponent::Collision::Type MapCollisionComponent::collisionFromMoveType(Map::MoveType type)
-{
-  switch (type)
-  {
-    case Map::MoveType::Wall: return Collision::Type::wall;
-    case Map::MoveType::Wrap: return Collision::Type::wrap;
-    case Map::MoveType::Warp: return Collision::Type::teleport;
-    case Map::MoveType::ReverseWarp: return Collision::Type::reverse;
-  }
-}
@@ -1,47 +0,0 @@
-#ifndef MAP_COLLISION_H
-#define MAP_COLLISION_H
-
-#include "entity.h"
-#include "map.h"
-#include <list>
-
-class Game;
-
-class MapCollisionComponent : public Component {
-  public:
-    MapCollisionComponent(const Map& map);
-    void detectCollision(Game& game, Entity& entity, Entity& collider, std::pair<double, double> old_position);
-    
-  private:
-    enum class Direction {
-      up, left, down, right
-    };
-
-    struct Collision {
-      enum class Type {
-        wall,
-        wrap,
-        teleport,
-        reverse,
-        platform,
-        danger
-      };
-      
-      double axis;
-      double lower;
-      double upper;
-      Type type;
-    };
-    
-    void addCollision(double axis, double lower, double upper, Direction dir, Collision::Type type);
-    void processCollision(Game& game, Entity& collider, Collision collision, Direction dir, std::pair<double, double> old_position);
-    Collision::Type collisionFromMoveType(Map::MoveType type);
-    
-    std::list<Collision> left_collisions;
-    std::list<Collision> right_collisions;
-    std::list<Collision> up_collisions;
-    std::list<Collision> down_collisions;
-    const Map& map;
-};
-
-#endif
@@ -1,40 +0,0 @@
-#include "map_render.h"
-#include "map.h"
-#include "game.h"
-#include "consts.h"
-
-MapRenderComponent::MapRenderComponent(const Map& map) : screen(GAME_WIDTH, GAME_HEIGHT)
-{
-  screen.fill(screen.entirety(), 0, 0, 0);
-  
-  Texture tiles("res/tiles.png");
-  
-  for (int i=0; i<MAP_WIDTH*MAP_HEIGHT; i++)
-  {
-    int tile = map.getMapdata()[i];
-    int x = i % MAP_WIDTH;
-    int y = i / MAP_WIDTH;
-    Rectangle dst {x*TILE_WIDTH, y*TILE_HEIGHT, TILE_WIDTH, TILE_HEIGHT};
-    Rectangle src {tile%8*TILE_WIDTH, tile/8*TILE_HEIGHT, TILE_WIDTH, TILE_HEIGHT};
-
-    if (tile > 0)
-    {
-      screen.blit(tiles, src, dst);
-    }
-  }
-  
-  Texture font("res/font.bmp");
-  std::string map_name = map.getTitle();
-  int start_x = (40/2) - (map_name.length()/2);
-  for (size_t i=0; i<map_name.length(); i++)
-  {
-    Rectangle srcRect {map_name[i] % 16 * 8, map_name[i] / 16 * 8, 8, 8};
-    Rectangle dstRect {(start_x + (int)i)*8, 24*8, 8, 8};
-    screen.blit(font, srcRect, dstRect);
-  }
-}
-
-void MapRenderComponent::render(Game&, Entity&, Texture& buffer)
-{
-  buffer.blit(screen, screen.entirety(), buffer.entirety());
-}
@@ -1,19 +0,0 @@
-#ifndef MAP_RENDER_H
-#define MAP_RENDER_H
-
-#include "entity.h"
-#include "renderer.h"
-
-class Map;
-class Game;
-
-class MapRenderComponent : public Component {
-  public:
-    MapRenderComponent(const Map& map);
-    void render(Game& game, Entity& entity, Texture& buffer);
-    
-  private:
-    Texture screen;
-};
-
-#endif
@@ -0,0 +1,152 @@
+#ifndef MAPPABLE_H_0B0316FB
+#define MAPPABLE_H_0B0316FB
+
+#include <map>
+#include <string>
+#include <vector>
+#include <list>
+#include "component.h"
+#include "renderer/texture.h"
+#include "components/ponderable.h"
+#include "entity_manager.h"
+
+class MappableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  /**
+   * Helper type that stores information about map adjacency.
+   */
+  class Adjacent {
+  public:
+
+    enum class Type {
+      wall,
+      wrap,
+      warp,
+      reverse
+    };
+
+    Adjacent(
+      Type type = Type::wall,
+      size_t mapId = 0) :
+        type(type),
+        mapId(mapId)
+    {
+    }
+
+    Type type;
+    size_t mapId;
+  };
+
+  /**
+   * Helper type that stores information about collision boundaries.
+   */
+  class Boundary {
+  public:
+
+    using Type = PonderableComponent::Collision;
+
+    Boundary(
+      double axis,
+      double lower,
+      double upper,
+      Type type) :
+        axis(axis),
+        lower(lower),
+        upper(upper),
+        type(type)
+    {
+    }
+
+    double axis;
+    double lower;
+    double upper;
+    Type type;
+  };
+
+  /**
+   * Helper types for efficient storage and lookup of collision boundaries.
+   */
+  using asc_boundaries_type =
+    std::multimap<
+      double,
+      const Boundary,
+      std::less<double>>;
+
+  using desc_boundaries_type =
+    std::multimap<
+      double,
+      const Boundary,
+      std::greater<double>>;
+
+  /**
+   * Constructor for initializing the tileset and font attributes, as they are
+   * not default constructible.
+   */
+  MappableComponent(
+    Texture tileset,
+    Texture font) :
+      tileset(std::move(tileset)),
+      font(std::move(font))
+  {
+  }
+
+  /**
+   * The ID of the map in the world definition that this entity represents.
+   *
+   * @managed_by RealizingSystem
+   */
+  size_t mapId;
+
+  /**
+   * The title of the map, which is displayed at the bottom of the screen.
+   */
+  std::string title;
+
+  /**
+   * The map data.
+   *
+   * @managed_by RealizingSystem
+   */
+  std::vector<int> tiles;
+
+  /**
+   * These objects describe the behavior of the four edges of the map.
+   *
+   * @managed_by RealizingSystem
+   */
+  Adjacent leftAdjacent;
+  Adjacent rightAdjacent;
+  Adjacent upAdjacent;
+  Adjacent downAdjacent;
+
+  /**
+   * Collision boundaries, for detecting when a ponderable entity is colliding
+   * with the environment.
+   *
+   * @managed_by MappingSystem
+   */
+  desc_boundaries_type leftBoundaries;
+  asc_boundaries_type rightBoundaries;
+  desc_boundaries_type upBoundaries;
+  asc_boundaries_type downBoundaries;
+
+  /**
+   * The list of entities representing the objects owned by the map.
+   *
+   * @managed_by RealizingSystem
+   */
+  std::list<id_type> objects;
+
+  /**
+   * The tilesets for the map and the map name.
+   *
+   * TODO: These probably do not belong here.
+   */
+  Texture tileset;
+  Texture font;
+};
+
+#endif /* end of include guard: MAPPABLE_H_0B0316FB */
@@ -0,0 +1,69 @@
+#ifndef ORIENTABLE_H_EDB6C4A1
+#define ORIENTABLE_H_EDB6C4A1
+
+#include "component.h"
+
+class OrientableComponent : public Component {
+public:
+
+  enum class WalkState {
+    still,
+    left,
+    right
+  };
+
+  enum class DropState {
+    none,
+    ready,
+    active
+  };
+
+  inline bool isFacingRight() const
+  {
+    return facingRight_;
+  }
+
+  inline void setFacingRight(bool v)
+  {
+    facingRight_ = v;
+  }
+
+  inline WalkState getWalkState() const
+  {
+    return walkState_;
+  }
+
+  inline void setWalkState(WalkState v)
+  {
+    walkState_ = v;
+  }
+
+  inline bool isJumping() const
+  {
+    return jumping_;
+  }
+
+  inline void setJumping(bool v)
+  {
+    jumping_ = v;
+  }
+
+  inline DropState getDropState() const
+  {
+    return dropState_;
+  }
+
+  inline void setDropState(DropState v)
+  {
+    dropState_ = v;
+  }
+
+private:
+
+  bool facingRight_ = false;
+  WalkState walkState_ = WalkState::still;
+  bool jumping_ = false;
+  DropState dropState_ = DropState::none;
+};
+
+#endif /* end of include guard: ORIENTABLE_H_EDB6C4A1 */
@@ -1,66 +0,0 @@
-#include "physics_body.h"
-#include "game.h"
-#include "consts.h"
-
-void PhysicsBodyComponent::receive(Game&, Entity&, const Message& msg)
-{
-  if (msg.type == Message::Type::walkLeft)
-  {
-    velocity.first = -90;
-  } else if (msg.type == Message::Type::walkRight)
-  {
-    velocity.first = 90;
-  } else if (msg.type == Message::Type::stopWalking)
-  {
-    velocity.first = 0.0;
-  } else if (msg.type == Message::Type::setHorizontalVelocity)
-  {
-    velocity.first = msg.velocity;
-  } else if (msg.type == Message::Type::setVerticalVelocity)
-  {
-    velocity.second = msg.velocity;
-  }
-}
-
-void PhysicsBodyComponent::tick(Game&, Entity& entity, double dt)
-{
-  // Accelerate
-  velocity.first += accel.first * dt;
-  velocity.second += accel.second * dt;
-  
-  // Terminal velocity
-#define TERMINAL_VELOCITY_X (2 * TILE_WIDTH * FRAMES_PER_SECOND)
-#define TERMINAL_VELOCITY_Y (2 * TILE_HEIGHT * FRAMES_PER_SECOND)
-  if (velocity.first < -TERMINAL_VELOCITY_X) velocity.first = -TERMINAL_VELOCITY_X;
-  if (velocity.first > TERMINAL_VELOCITY_X) velocity.first = TERMINAL_VELOCITY_X;
-  if (velocity.second < -TERMINAL_VELOCITY_Y) velocity.second = -TERMINAL_VELOCITY_Y;
-  if (velocity.second > TERMINAL_VELOCITY_Y) velocity.second = TERMINAL_VELOCITY_Y;
-  
-  // Do the movement
-  entity.position.first += velocity.first * dt;
-  entity.position.second += velocity.second * dt;
-}
-
-void PhysicsBodyComponent::detectCollision(Game& game, Entity& entity, Entity& collider, std::pair<double, double> old_position)
-{
-  // If already colliding, do nothing!
-  if ((old_position.first + collider.size.first > entity.position.first)
-    && (old_position.first < entity.position.first + entity.size.first)
-    && (old_position.second + collider.size.second > entity.position.second)
-    && (old_position.second < entity.position.second + entity.size.second))
-  {
-    return;
-  }
-  
-  // If newly colliding, SHOCK AND HORROR!
-  if ((collider.position.first + collider.size.first > entity.position.first)
-    && (collider.position.first < entity.position.first + entity.size.first)
-    && (collider.position.second + collider.size.second > entity.position.second)
-    && (collider.position.second < entity.position.second + entity.size.second))
-  {
-    Message msg(Message::Type::collision);
-    msg.collisionEntity = &collider;
-    
-    entity.send(game, msg);
-  }
-}
@@ -1,20 +0,0 @@
-#ifndef PHYSICS_BODY_H
-#define PHYSICS_BODY_H
-
-#include "entity.h"
-#include <utility>
-
-class Game;
-
-class PhysicsBodyComponent : public Component {
-  public:
-    void receive(Game& game, Entity& entity, const Message& msg);
-    void tick(Game& game, Entity& entity, double dt);
-    void detectCollision(Game& game, Entity& entity, Entity& collider, std::pair<double, double> old_position);
-    
-  protected:    
-    std::pair<double, double> velocity;
-    std::pair<double, double> accel;
-};
-
-#endif
@@ -0,0 +1,35 @@
+#ifndef PLAYABLE_H_DDC566C3
+#define PLAYABLE_H_DDC566C3
+
+#include "component.h"
+#include "entity_manager.h"
+#include "vector.h"
+
+class PlayableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  /**
+   * The entity ID of the map that the player is on.
+   *
+   * @managed_by PlayingSystem
+   */
+  id_type mapId;
+
+  /**
+   * The map ID and coordinates of the location that the player will spawn after
+   * dying. Note that the map ID here is a world description map ID, not an
+   * entity ID.
+   *
+   * @managed_by PlayingSystem
+   */
+  size_t checkpointMapId;
+  vec2d checkpointPos;
+
+  bool checkpointMapObject = false;
+  size_t checkpointMapObjectIndex;
+
+};
+
+#endif /* end of include guard: PLAYABLE_H_DDC566C3 */
@@ -1,118 +0,0 @@
-#include "player_physics.h"
-#include "muxer.h"
-#include "game.h"
-#include "consts.h"
-
-#define JUMP_VELOCITY(h, l) (-2 * (h) / (l))
-#define JUMP_GRAVITY(h, l) (2 * ((h) / (l)) / (l))
-
-PlayerPhysicsComponent::PlayerPhysicsComponent()
-{
-  jump_velocity = JUMP_VELOCITY(TILE_HEIGHT*4.5, 0.3);
-  jump_gravity = JUMP_GRAVITY(TILE_HEIGHT*4.5, 0.3);
-  jump_gravity_short = JUMP_GRAVITY(TILE_HEIGHT*3.5, 0.233);
-  
-  accel.second = jump_gravity_short;
-}
-
-void PlayerPhysicsComponent::receive(Game&, Entity& entity, const Message& msg)
-{
-  if (msg.type == Message::Type::walkLeft)
-  {
-    velocity.first = -90;
-    direction = -1;
-  } else if (msg.type == Message::Type::walkRight)
-  {
-    velocity.first = 90;
-    direction = 1;
-  } else if (msg.type == Message::Type::stopWalking)
-  {
-    velocity.first = 0.0;
-    direction = 0;
-  } else if (msg.type == Message::Type::setHorizontalVelocity)
-  {
-    velocity.first = msg.velocity;
-  } else if (msg.type == Message::Type::setVerticalVelocity)
-  {
-    velocity.second = msg.velocity;
-  } else if (msg.type == Message::Type::hitTheGround)
-  {
-    if (isFalling)
-    {
-      playSound("res/Randomize27.wav", 0.05);
-      isFalling = false;
-    }
-    
-    velocity.second = 0.0;
-  } else if (msg.type == Message::Type::jump)
-  {
-    playSound("res/Randomize87.wav", 0.25);
-    
-    velocity.second = jump_velocity;
-    accel.second = jump_gravity;
-  } else if (msg.type == Message::Type::stopJump)
-  {
-    accel.second = jump_gravity_short;
-  } else if (msg.type == Message::Type::canDrop)
-  {
-    canDrop = true;
-  } else if (msg.type == Message::Type::cantDrop)
-  {
-    canDrop = false;
-  } else if (msg.type == Message::Type::drop)
-  {
-    if (canDrop)
-    {
-      canDrop = false;
-    } else {
-      entity.position.second = msg.dropAxis - entity.size.second;
-      velocity.second = 0;
-    }
-  } else if (msg.type == Message::Type::die)
-  {
-    frozen = true;
-  } else if (msg.type == Message::Type::stopDying)
-  {
-    frozen = false;
-  }
-}
-
-void PlayerPhysicsComponent::tick(Game& game, Entity& entity, double dt)
-{
-  // If frozen, do nothing
-  if (frozen)
-  {
-    return;
-  }
-  
-  // Continue walking even if blocked earlier
-  if (velocity.first == 0)
-  {
-    if (direction < 0)
-    {
-      velocity.first = -90;
-    } else if (direction > 0)
-    {
-      velocity.first = 90;
-    }
-  }
-  
-  // Increase gravity at the height of jump
-  if ((accel.second == jump_gravity) && (velocity.second >= 0))
-  {
-    accel.second = jump_gravity_short;
-  }
-  
-  // Do the movement
-  std::pair<double, double> old_position = entity.position;
-  PhysicsBodyComponent::tick(game, entity, dt);
-    
-  // Check for collisions
-  game.detectCollision(entity, old_position);
-  
-  // Are we moving due to gravity?
-  if (velocity.second != 0.0)
-  {
-    isFalling = true;
-  }
-}
@@ -1,25 +0,0 @@
-#ifndef PLAYER_PHYSICS_H
-#define PLAYER_PHYSICS_H
-
-#include "entity.h"
-#include "physics_body.h"
-
-class Game;
-
-class PlayerPhysicsComponent : public PhysicsBodyComponent {
-  public:
-    PlayerPhysicsComponent();
-    void tick(Game& game, Entity& entity, double dt);
-    void receive(Game& game, Entity& entity, const Message& msg);
-    
-  private:
-    double jump_velocity;
-    double jump_gravity;
-    double jump_gravity_short;
-    int direction = 0;
-    bool canDrop = false;
-    bool frozen = false;
-    bool isFalling = false;
-};
-
-#endif
@@ -1,60 +0,0 @@
-#include "player_sprite.h"
-
-PlayerSpriteComponent::PlayerSpriteComponent() : sprite("res/Starla.png")
-{
-  
-}
-
-void PlayerSpriteComponent::render(Game&, Entity& entity, Texture& buffer)
-{
-  animFrame++;
-  
-  int frame = 0;
-  if (isMoving)
-  {
-    frame += 2;
-    
-    if (animFrame % 20 < 10)
-    {
-      frame += 2;
-    }
-  }
-  
-  if (facingLeft)
-  {
-    frame++;
-  }
-  
-  double alpha = 1.0;
-  if (dying && (animFrame % 4 < 2))
-  {
-    alpha = 0.0;
-  }
-  
-  Rectangle src_rect {frame*10, 0, 10, 12};
-  Rectangle dst_rect {(int) entity.position.first, (int) entity.position.second, entity.size.first, entity.size.second};
-  buffer.blit(sprite, src_rect, dst_rect, alpha);
-}
-
-void PlayerSpriteComponent::receive(Game&, Entity&, const Message& msg)
-{
-  if (msg.type == Message::Type::walkLeft)
-  {
-    facingLeft = true;
-    isMoving = true;
-  } else if (msg.type == Message::Type::walkRight)
-  {
-    facingLeft = false;
-    isMoving = true;
-  } else if (msg.type == Message::Type::stopWalking)
-  {
-    isMoving = false;
-  } else if (msg.type == Message::Type::die)
-  {
-    dying = true;
-    isMoving = false;
-  } else if (msg.type == Message::Type::stopDying)
-  {
-    dying = false;
-  }
-}
@@ -1,23 +0,0 @@
-#ifndef PLAYER_SPRITE_H
-#define PLAYER_SPRITE_H
-
-#include "entity.h"
-#include "renderer.h"
-
-class Game;
-
-class PlayerSpriteComponent : public Component {
-  public:
-    PlayerSpriteComponent();
-    void render(Game& game, Entity& entity, Texture& buffer);
-    void receive(Game& game, Entity& entity, const Message& msg);
-    
-  private:
-    Texture sprite;
-    int animFrame = 0;
-    bool facingLeft = false;
-    bool isMoving = false;
-    bool dying = false;
-};
-
-#endif
@@ -0,0 +1,131 @@
+#ifndef TANGIBLE_H_746DB3EE
+#define TANGIBLE_H_746DB3EE
+
+#include <set>
+#include "component.h"
+#include "entity_manager.h"
+#include "vector.h"
+#include "direction.h"
+
+class PonderableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  /**
+   * List of different types of physical bodies.
+   *
+   * vacuumed     - Default.
+   * freefalling  - The body will be treated as if there were a downward force
+   *                of gravity being exerted onto it. The body will also exhibit
+   *                terminal velocity (that is, its downward velocity will be
+   *                capped at a constant value).
+   */
+  enum class Type {
+    vacuumed,
+    freefalling
+  };
+
+  /**
+   * List of different types of collidable surfaces.
+   */
+  enum class Collision {
+    wall,
+    platform,
+    adjacency,
+    warp,
+    danger,
+    event
+  };
+
+  /**
+   * Constructor for initializing the body type, which is a constant.
+   */
+  PonderableComponent(Type type) : type(type)
+  {
+  }
+
+  /**
+   * The velocity of the body.
+   */
+  vec2d vel = { 0.0, 0.0 };
+
+  /**
+   * The acceleration of the body.
+   */
+  vec2d accel = { 0.0, 0.0 };
+
+  /**
+   * The type of physical body that the entity is meant to assume. The body will
+   * be acted upon differently based on this. See the enumeration above for more
+   * details.
+   *
+   * @managed_by PonderingSystem
+   */
+  const Type type;
+
+  /**
+   * Whether or not a freefalling body is in contact with the ground.
+   *
+   * @managed_by PonderingSystem
+   */
+  bool grounded = false;
+
+  /**
+   * Whether or not a freefalling body is being ferried by another body.
+   *
+   * @managed_by PonderingSystem
+   */
+  bool ferried = false;
+
+  /**
+   * The entity that is ferrying this body, if there is one.
+   *
+   * @managed_by PonderingSystem
+   */
+  id_type ferry;
+
+  /**
+   * The side of the ferry that the body is resting on, if there is one.
+   *
+   * @managed_by PonderingSystem
+   */
+  Direction ferrySide;
+
+  /**
+   * The bodies that are being ferried by this body.
+   *
+   * @managed_by PonderingSystem
+   */
+  std::set<id_type> passengers;
+
+  /**
+   * If enabled, this will prevent the body from moving and accelerating. The
+   * velocity and position of the body can still be affected by sources external
+   * to the PonderingSystem. Enabling this will cause applicable bodies to
+   * become ungrounded and unferried.
+   */
+  bool frozen = false;
+
+  /**
+   * If disabled, collision detection for this body will not be performed and
+   * other bodies will ignore it. Disabling this will cause applicable bodies to
+   * become ungrounded and unferried.
+   */
+  bool collidable = true;
+
+  /**
+   * The effect that colliding with this body has.
+   */
+  Collision colliderType = Collision::wall;
+
+  /**
+   * If this flag is disabled, the entity will be ignored by the pondering
+   * system.
+   *
+   * @managed_by RealizingSystem
+   */
+  bool active = false;
+};
+
+#endif /* end of include guard: TANGIBLE_H_746DB3EE */
@@ -0,0 +1,23 @@
+#ifndef PROTOTYPABLE_H_817F2205
+#define PROTOTYPABLE_H_817F2205
+
+#include "component.h"
+#include "entity_manager.h"
+
+class PrototypableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  /**
+   * The index of the object in the map definition.
+   */
+  size_t mapObjectIndex;
+
+  /**
+   * The name of the prototype that the object was spawned from.
+   */
+  std::string prototypeId;
+};
+
+#endif /* end of include guard: PROTOTYPABLE_H_817F2205 */
@@ -0,0 +1,51 @@
+#ifndef AUTOMATABLE_H_3D519131
+#define AUTOMATABLE_H_3D519131
+
+#include "component.h"
+#include <sol.hpp>
+#include <memory>
+#include "entity_manager.h"
+
+class RunnableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  /**
+   * A Lua stack where the entity's script is running.
+   *
+   * NOTE: This object is called a thread, but there is no multi-threading going
+   * on.
+   *
+   * @managed_by ScriptingSystem
+   */
+  std::unique_ptr<sol::thread> runner;
+
+  /**
+   * An entry point to the script running in the runner thread.
+   *
+   * @managed_by ScriptingSystem
+   */
+  std::unique_ptr<sol::coroutine> callable;
+
+  /**
+   * Whether or not this entity represents a behavior script. A behavior script
+   * usually does not terminate on its own, and can be terminated at will by
+   * another system, usually when the automatable entity leaves the active map.
+   *
+   * @managed_by ScriptingSystem
+   */
+  bool behavior = false;
+
+  /**
+   * If this is a behavior script, this is the ID of the automatable entity that
+   * the behavior belongs to. This is required so that the ScriptingSystem can
+   * notify the automatable entity if the behavior script terminates by itself,
+   * and that it shouldn't attempt to terminate it.
+   *
+   * @managed_by ScriptingSystem
+   */
+  id_type actor;
+};
+
+#endif /* end of include guard: AUTOMATABLE_H_3D519131 */
@@ -0,0 +1,21 @@
+#ifndef SCHEDULABLE_H_1DA3FA2A
+#define SCHEDULABLE_H_1DA3FA2A
+
+#include "component.h"
+#include <tuple>
+#include <list>
+#include <functional>
+#include "entity_manager.h"
+
+class SchedulableComponent : public Component {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  using Callback = std::function<void(id_type)>;
+  using Action = std::tuple<double, Callback>;
+
+  std::list<Action> actions;
+};
+
+#endif /* end of include guard: SCHEDULABLE_H_1DA3FA2A */
@@ -1,14 +0,0 @@
-#include "simple_collider.h"
-
-SimpleColliderComponent::SimpleColliderComponent(std::function<void (Game& game, Entity& collider)> callback) : callback(callback)
-{
-  
-}
-
-void SimpleColliderComponent::receive(Game& game, Entity&, const Message& msg)
-{
-  if (msg.type == Message::Type::collision)
-  {
-    callback(game, *msg.collisionEntity);
-  }
-}
@@ -1,18 +0,0 @@
-#ifndef SIMPLE_COLLIDER_H
-#define SIMPLE_COLLIDER_H
-
-#include "entity.h"
-#include <functional>
-
-class Game;
-
-class SimpleColliderComponent : public Component {
-  public:
-    SimpleColliderComponent(std::function<void (Game& game, Entity& collider)> callback);
-    void receive(Game& game, Entity& entity, const Message& msg);
-    
-  private:
-    std::function<void (Game& game, Entity& collider)> callback;
-};
-
-#endif
@@ -1,11 +0,0 @@
-#include "static_image.h"
-
-StaticImageComponent::StaticImageComponent(const char* filename) : sprite(Texture(filename))
-{
-  
-}
-
-void StaticImageComponent::render(Game&, Entity& entity, Texture& buffer)
-{
-  buffer.blit(sprite, sprite.entirety(), {(int) entity.position.first, (int) entity.position.second, entity.size.first, entity.size.second});
-}
@@ -1,18 +0,0 @@
-#ifndef STATIC_IMAGE_H
-#define STATIC_IMAGE_H
-
-#include "entity.h"
-#include "renderer.h"
-
-class Game;
-
-class StaticImageComponent : public Component {
-  public:
-    StaticImageComponent(const char* filename);
-    void render(Game& game, Entity& entity, Texture& buffer);
-    
-  private:
-    Texture sprite;
-};
-
-#endif
@@ -0,0 +1,35 @@
+#ifndef LOCATABLE_H_39E526CA
+#define LOCATABLE_H_39E526CA
+
+#include "component.h"
+#include "vector.h"
+
+class TransformableComponent : public Component {
+public:
+
+  /**
+   * The coordinates of the entity.
+   *
+   * Note that ponderable entities sometimes have special behavior related to
+   * their coordinates, specifically that ferried bodies will behave oddly if
+   * their coordinates are changed outside of the PonderingSystem. Before doing
+   * so, use PonderingSystem::unferry on the body to ensure that it is not
+   * ferried.
+   */
+  vec2d pos;
+
+  /**
+   * The size of the entity.
+   */
+  vec2i size;
+
+  /**
+   * For prototypes, the original coordinates and size of the entity.
+   *
+   * @managed_by RealizingSystem
+   */
+  vec2d origPos;
+  vec2i origSize;
+};
+
+#endif /* end of include guard: LOCATABLE_H_39E526CA */
@@ -1,100 +0,0 @@
-#include "user_movement.h"
-#include "renderer.h"
-
-void UserMovementComponent::input(Game& game, Entity& entity, int key, int action)
-{
-  if (action == GLFW_PRESS)
-  {
-    if (key == GLFW_KEY_LEFT)
-    {
-      holdingLeft = true;
-      
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::walkLeft);
-      }
-    } else if (key == GLFW_KEY_RIGHT)
-    {
-      holdingRight = true;
-      
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::walkRight);
-      }
-    } else if (key == GLFW_KEY_UP)
-    {
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::jump);
-      }
-    } else if (key == GLFW_KEY_DOWN)
-    {
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::canDrop);
-      }
-    }
-  } else if (action == GLFW_RELEASE)
-  {
-    if (key == GLFW_KEY_LEFT)
-    {
-      holdingLeft = false;
-      
-      if (!frozen)
-      {
-        if (holdingRight)
-        {
-          entity.send(game, Message::Type::walkRight);
-        } else {
-          entity.send(game, Message::Type::stopWalking);
-        }
-      }
-    } else if (key == GLFW_KEY_RIGHT)
-    {
-      holdingRight = false;
-      
-      if (!frozen)
-      {
-        if (holdingLeft)
-        {
-          entity.send(game, Message::Type::walkLeft);
-        } else {
-          entity.send(game, Message::Type::stopWalking);
-        }
-      }
-    } else if (key == GLFW_KEY_DOWN)
-    {
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::cantDrop);
-      }
-    } else if (key == GLFW_KEY_UP)
-    {
-      if (!frozen)
-      {
-        entity.send(game, Message::Type::stopJump);
-      }
-    }
-  }
-}
-
-void UserMovementComponent::receive(Game& game, Entity& entity, const Message& msg)
-{
-  if (msg.type == Message::Type::die)
-  {
-    frozen = true;
-    
-    entity.send(game, Message::Type::stopWalking);
-  } else if (msg.type == Message::Type::stopDying)
-  {
-    frozen = false;
-    
-    if (holdingLeft)
-    {
-      entity.send(game, Message::Type::walkLeft);
-    } else if (holdingRight)
-    {
-      entity.send(game, Message::Type::walkRight);
-    }
-  }
-}
@@ -1,19 +0,0 @@
-#ifndef USER_MOVEMENT_H
-#define USER_MOVEMENT_H
-
-#include "entity.h"
-
-class Game;
-
-class UserMovementComponent : public Component {
-  public:
-    void input(Game& game, Entity& entity, int key, int action);
-    void receive(Game&, Entity&, const Message& msg);
-      
-  private:
-    bool holdingLeft = false;
-    bool holdingRight = false;
-    bool frozen = false;
-};
-
-#endif