Pacman and ghosts can eat each others

lib/Atlas.hpp

@@ -22,6 +22,33 @@ namespace Atlas {
   constexpr PositionInt pacman_down_wide = { 7, 0 };
   constexpr PositionInt pacman_down_narrow = { 8, 0 };
 
+  constexpr PositionInt ghost_frightened1 = { 0, 7 };
+  constexpr PositionInt ghost_frightened2 = { 1, 7 };
+  constexpr PositionInt ghost_frightened3 = { 2, 7 };
+  constexpr PositionInt ghost_frightened4 = { 3, 7 };
+
+  constexpr PositionInt eyeSprite(Direction direction) {
+    int x = 0;
+    switch (direction) {
+      case Direction::RIGHT:
+        x = 0;
+        break;
+      case Direction::DOWN:
+        x = 2;
+        break;
+      case Direction::LEFT:
+        x = 4;
+        break;
+      case Direction::UP:
+        x = 6;
+        break;
+      default:
+        x = 0;
+        break;
+    }
+    return { x, 6 };
+  }
+
   constexpr PositionInt ghostSprite(Ghost ghost, Direction direction, bool alternative) {
     assert(ghost >= Ghost::blinky && ghost <= Ghost::clyde && "Invalid Ghost");
     int y = static_cast<int>(ghost);

lib/Board.cpp

@@ -58,16 +58,15 @@ bool Board::isWalkableForGhost(Position point, float d, Direction direction) con
 }
 
 bool Board::isWalkable(Position point) const {
-     return board_state[int(point.y)][int(point.x)] != uint8_t(Cell::wall);
+  return board_state[int(point.y)][int(point.x)] != uint8_t(Cell::wall);
 }
 
-bool Board::isWalkableForGost(Position point, Position origin) const
-{
-    return isWalkable(point) && (isInPen(origin) || !isInPen(point));
+bool Board::isWalkableForGost(Position point, Position origin, bool isEyes) const {
+  return isWalkable(point) && (isEyes || (isInPen(origin) || !isInPen(point)));
 }
 
 bool Board::isInPen(Position point) const {
-    return board_state[int(point.y)][int(point.x)] == uint8_t(Cell::pen);
+  return board_state[int(point.y)][int(point.x)] == uint8_t(Cell::pen);
 }
 
 bool Board::isWalkable(Position point, float position_delta, Direction direction, bool pacman) const {

lib/Board.hpp

@@ -26,7 +26,7 @@ public:
   [[nodiscard]] bool isWalkableForPacMan(Position point, float d, Direction direction) const;
   [[nodiscard]] bool isWalkableForGhost(Position point, float d, Direction direction) const;
 
-  [[nodiscard]] bool isWalkableForGost(Position point, Position origin) const;
+  [[nodiscard]] bool isWalkableForGost(Position point, Position origin, bool isEyes) const;
   [[nodiscard]] bool isWalkable(Position point) const;
   [[nodiscard]] bool isInPen(Position point) const;
 

lib/Canvas.cpp

@@ -24,15 +24,17 @@ void Canvas::update(const Game & game) {
   renderMaze();
   renderPellets(game.pellets);
   renderSuperPellets(game.superPellets);
-  renderPacMan(game.pacMan);
 
-  std::apply([&](const auto&... ghost) {
-      (renderGhost(ghost),...);
-  }, game.ghosts);
+  std::apply([&](const auto &... ghost) {
+    (renderGhost(ghost), ...);
+  },
+             game.ghosts);
 
   renderScore(game.score.points);
   renderLives(game.score.lives);
 
+  renderPacMan(game.pacMan);
+
   render();
 }
 

lib/Direction.hpp

@@ -8,14 +8,18 @@ enum class Direction {
   DOWN
 };
 
-inline Direction oppositeDirection(Direction d)
-{
-    switch (d) {
-        case Direction::LEFT: return Direction::RIGHT;
-        case Direction::RIGHT: return Direction::LEFT;
-        case Direction::UP: return Direction::DOWN;
-        case Direction::DOWN: return Direction::UP;
-        case Direction::NONE: return d;
-    }
-    return d;
+inline Direction oppositeDirection(Direction d) {
+  switch (d) {
+    case Direction::LEFT:
+      return Direction::RIGHT;
+    case Direction::RIGHT:
+      return Direction::LEFT;
+    case Direction::UP:
+      return Direction::DOWN;
+    case Direction::DOWN:
+      return Direction::UP;
+    case Direction::NONE:
+      return d;
+  }
+  return d;
 }

lib/Game.cpp

@@ -5,7 +5,7 @@
 constexpr int DEFAULT_LIVES = 3;
 constexpr int NORMAL_PELLET_POINTS = 10;
 constexpr int POWER_PELLET_POINTS = 50;
-//constexpr int GHOST_POINTS[] = {200, 400, 800, 1600};
+constexpr int GHOST_POINTS = 200;
 
 Game::Game()
   : pacMan(board),
@@ -15,7 +15,6 @@ Game::Game()
   score.lives = DEFAULT_LIVES;
 }
 
-
 auto Game::now() {
   return std::chrono::system_clock::now();
 }
@@ -48,15 +47,54 @@ void Game::run() {
 }
 
 void Game::step(std::chrono::milliseconds delta, InputState inputState) {
+
   pacMan.update(delta, inputState, board);
 
+  if (timeSinceDeath.count() != 0) {
+    timeSinceDeath += delta;
+  }
+
+  if (timeSinceDeath.count() > 1000) {
+    std::apply([&](auto &... ghost) {
+      (ghost.reset(), ...);
+    },
+               ghosts);
+    pacMan.reset(board);
+    timeSinceDeath = std::chrono::milliseconds(0);
+  }
+
+  if (timeSinceDeath.count())
+    return;
+
+  if (!pacMan.onTheMove())
+    return;
+
   std::apply([&](auto &... ghost) {
-      (ghost.update(delta, board),...);
-  }, ghosts);
+    (ghost.update(delta, board), ...);
+    (checkCollision(ghost), ...);
+  },
+             ghosts);
 
   eatPellets();
 }
 
+void Game::checkCollision(Ghost & g) {
+  if (timeSinceDeath.count() || g.isEyes())
+    return;
+
+  if (g.positionInGrid() != pacMan.positionInGrid())
+    return;
+
+  if (g.isFrightened()) {
+    g.eat();
+    score.points += GHOST_POINTS;
+  } else {
+    pacMan.eat();
+    score.lives--;
+    timeSinceDeath = std::chrono::milliseconds(1);
+  }
+}
+
 void Game::eatPellets() {
   const auto pos = pacMan.positionInGrid();
   if (pellets.eatPelletAtPosition(pos)) {
@@ -67,6 +105,10 @@ void Game::eatPellets() {
   if (superPellets.eatPelletAtPosition(pos)) {
     score.eatenPellets++;
     score.points += POWER_PELLET_POINTS;
+    std::apply([&](auto &... ghost) {
+      (ghost.frighten(), ...);
+    },
+               ghosts);
   }
 }
 

lib/Game.hpp

@@ -25,10 +25,12 @@ private:
   SuperPellets superPellets;
   std::tuple<Blinky, Speedy, Inky, Clyde> ghosts;
   Score score;
+  std::chrono::milliseconds timeSinceDeath;
 
   void step(std::chrono::milliseconds delta, InputState inputState);
   void eatPellets();
   void processEvents(InputState & inputState);
+  void checkCollision(Ghost & g);
 
   [[nodiscard]] static auto now();
 };

lib/Ghost.cpp

@@ -8,8 +8,50 @@ Ghost::Ghost(Atlas::Ghost spritesSet, Position startingPosition, Position scatte
     scatterTarget(scatterTarget) {
 }
 
+void Ghost::frighten() {
+  if (state > State::Scatter)
+    return;
+  direction = oppositeDirection(direction);
+  state = State::Frightened;
+  timeFrighten = 0;
+}
+
+bool Ghost::isFrightened() const {
+  return state == State::Frightened;
+}
+
+bool Ghost::isEyes() const {
+  return state == State::Eyes;
+}
+
+void Ghost::eat() {
+  if (state == State::Eyes)
+    return;
+  direction = oppositeDirection(direction);
+  state = State::Eyes;
+  timeFrighten = 0;
+  timeChase = 0;
+}
+
+void Ghost::reset() {
+  pos = startingPosition;
+}
+
 [[nodiscard]] PositionInt Ghost::currentSprite() const {
-  return Atlas::ghostSprite(spritesSet, direction, alternate_animation);
+  switch (state) {
+    default:
+      return Atlas::ghostSprite(spritesSet, direction, (animationIndex % 2) == 0);
+    case State::Frightened:
+      if (timeFrighten < 3500)
+        return (animationIndex % 2) == 0 ? Atlas::ghost_frightened2 : Atlas::ghost_frightened1;
+      return std::array{ Atlas::ghost_frightened1,
+                         Atlas::ghost_frightened2,
+                         Atlas::ghost_frightened3,
+                         Atlas::ghost_frightened4 }[animationIndex];
+    case State::Eyes:
+      return Atlas::eyeSprite(direction);
+  }
+  return {};
 }
 
 Position Ghost::position() const {
@@ -17,89 +59,107 @@ Position Ghost::position() const {
 }
 
 Position Ghost::positionInGrid() const {
-    return { std::round(pos.x), std::round(pos.y) };
+  return { std::round(pos.x), std::round(pos.y) };
 }
 
 void Ghost::update(std::chrono::milliseconds time_delta, const Board & board) {
-    updateAnimation(time_delta);
-    updatePosition(time_delta, board);
+  if (state == State::Eyes && board.isInPen(positionInGrid()))
+    state = State::Scatter;
+
+  if (state == State::Frightened) {
+    timeFrighten += time_delta.count();
+    if (timeFrighten > 6000)
+      state = State::Scatter;
+  }
+
+  updateAnimation(time_delta);
+  updatePosition(time_delta, board);
 }
 
 void Ghost::updatePosition(std::chrono::milliseconds time_delta, const Board & board) {
-    updateDirection(board);
+  updateDirection(board);
 
-    float position_delta = (0.004 * time_delta.count()) * 0.75;
+  float position_delta = (0.004 * time_delta.count()) * speed();
 
-    switch (direction) {
-      case Direction::NONE:
-        break;
-      case Direction::LEFT:
-        pos.x -= position_delta;
-        pos.y = round(pos.y);
-        break;
-      case Direction::RIGHT:
-        pos.x += position_delta;
-        pos.y = round(pos.y);
-        break;
-      case Direction::UP:
-        pos.x = round(pos.x);
-        pos.y -= position_delta;
-        break;
-      case Direction::DOWN:
-        pos.x = round(pos.x);
-        pos.y += position_delta;
-        break;
-    }
+  switch (direction) {
+    case Direction::NONE:
+      break;
+    case Direction::LEFT:
+      pos.x -= position_delta;
+      pos.y = round(pos.y);
+      break;
+    case Direction::RIGHT:
+      pos.x += position_delta;
+      pos.y = round(pos.y);
+      break;
+    case Direction::UP:
+      pos.x = round(pos.x);
+      pos.y -= position_delta;
+      break;
+    case Direction::DOWN:
+      pos.x = round(pos.x);
+      pos.y += position_delta;
+      break;
+  }
+}
+
+double Ghost::speed() const {
+  if (state == State::Eyes)
+    return 2;
+  if (state == State::Frightened)
+    return 0.5;
+  return 0.75;
 }
 
 void Ghost::updateDirection(const Board & board) {
-    auto cell  = positionInGrid();
-    if(cell == lastIntersection)
-        return;
+  auto cell = positionInGrid();
+  if (cell == lastIntersection)
+    return;
 
-    struct NewDirection {
-        Direction direction;
-        Position position;
-        double distance;
-    };
+  struct NewDirection {
+    Direction direction;
+    Position position;
+    double distance;
+  };
 
-    auto [x , y] = cell;
-    std::array directions = {
-        NewDirection{Direction::UP,    {x, y-1}, 0},
-        NewDirection{Direction::LEFT,  {x-1, y}, 0},
-        NewDirection{Direction::DOWN,  {x, y+1}, 0},
-        NewDirection{Direction::RIGHT, {x+1, y}, 0}
-    };
-    const Position target = this->target(board);
+  auto [x, y] = cell;
+  std::array directions = {
+    NewDirection{ Direction::UP, { x, y - 1 }, 0 },
+    NewDirection{ Direction::LEFT, { x - 1, y }, 0 },
+    NewDirection{ Direction::DOWN, { x, y + 1 }, 0 },
+    NewDirection{ Direction::RIGHT, { x + 1, y }, 0 }
+  };
+  const Position target = this->target(board);
 
-    for(auto && d : directions) {
-        d.distance = (d.direction != oppositeDirection(direction) && board.isWalkableForGost(d.position, cell)) ?
-                   std::hypot(d.position.x - target.x, d.position.y - target.y)
-                 : std::numeric_limits<double>::infinity();
-    }
+  for (auto && d : directions) {
+    d.distance = (d.direction != oppositeDirection(direction) && board.isWalkableForGost(d.position, cell, state == State::Eyes)) ? std::hypot(d.position.x - target.x, d.position.y - target.y)
+                                                                                                                                  : std::numeric_limits<double>::infinity();
+  }
 
-    auto it = std::min_element(directions.begin(), directions.end(), [](const auto & a, const auto &b) {
-        return a.distance < b.distance;
-    });
+  auto it = std::min_element(directions.begin(), directions.end(), [](const auto & a, const auto & b) {
+    return a.distance < b.distance;
+  });
 
-    lastIntersection = cell;
-    direction = it->direction;
+  lastIntersection = cell;
+  direction = it->direction;
 }
 
 Position Ghost::target(const Board & board) const {
-    if(board.isInPen(positionInGrid()))
-        return board.penDoorPosition();
+  if (state == State::Eyes)
+    return startingPosition;
 
-    return scatterTarget;
+  if (board.isInPen(positionInGrid()))
+    return board.penDoorPosition();
+
+  return scatterTarget;
 }
 
-void Ghost::updateAnimation(std::chrono::milliseconds time_delta)
-{
-    time += time_delta.count();
-    if (time >= 250) {
-      time = 0;
-      alternate_animation = !alternate_animation;
-    }
+void Ghost::updateAnimation(std::chrono::milliseconds time_delta) {
+  timeForAnimation += time_delta.count();
+  if (timeForAnimation >= 250) {
+    timeForAnimation = 0;
+    animationIndex = (animationIndex + 1) % 4;
+  }
 }
 
 Blinky::Blinky(const Board & board)

lib/Ghost.hpp

@@ -11,7 +11,7 @@ public:
   enum class State {
     Chase,
     Scatter,
-    Freightened,
+    Frightened,
     Eyes,
   };
 
@@ -24,8 +24,14 @@ public:
   [[nodiscard]] Position positionInGrid() const;
 
   void update(std::chrono::milliseconds time_delta, const Board & board);
+  void frighten();
+  void eat();
+  bool isFrightened() const;
+  bool isEyes() const;
+  void reset();
 
 private:
+  double speed() const;
   void updateAnimation(std::chrono::milliseconds time_delta);
   void updatePosition(std::chrono::milliseconds time_delta, const Board & board);
   void updateDirection(const Board & board);
@@ -34,13 +40,15 @@ private:
 protected:
   Atlas::Ghost spritesSet;
   Direction direction = Direction::NONE;
-  double time = 0;
-  bool alternate_animation = false;
+  double timeForAnimation = 0;
+  int animationIndex = 0;
   State state = State::Chase;
+  int timeFrighten = 0;
+  int timeChase = 0;
   Position pos;
   Position startingPosition;
   Position scatterTarget;
-  Position lastIntersection = {-1, -1};
+  Position lastIntersection = { -1, -1 };
 };
 
 class Blinky : public Ghost {

lib/PacMan.cpp

@@ -5,7 +5,7 @@ PacMan::PacMan(const Board & board)
   : pos(Board::initialPacManPosition()) {}
 
 PositionInt PacMan::currentSprite() const {
-  return pacManAnimation.animationFrame(direction);
+  return eaten ? pacManAnimation.deathAnimationFrame(direction) : pacManAnimation.animationFrame(direction);
 }
 
 Position PacMan::position() const {
@@ -16,11 +16,27 @@ Position PacMan::positionInGrid() const {
   return { std::round(pos.x), std::round(pos.y) };
 }
 
-void PacMan::update(std::chrono::milliseconds time_delta, InputState state, const Board & board) {
-  setDirection(state);
-  const auto old = pos;
-  updateMazePosition(time_delta, board);
+void PacMan::eat() {
+  if (eaten)
+    return;
+  eaten = true;
+  direction = Direction::NONE;
+}
 
+void PacMan::reset(const Board & b) {
+  eaten = false;
+  direction = Direction::NONE;
+  pos = b.initialPacManPosition();
+}
+
+void PacMan::update(std::chrono::milliseconds time_delta, InputState state, const Board & board) {
+  if (eaten) {
+    updateAnimationPosition(time_delta, false);
+    return;
+  }
+  const auto old = pos;
+  setDirection(state);
+  updateMazePosition(time_delta, board);
   const bool paused = pos == old;
   updateAnimationPosition(time_delta, paused);
 }
@@ -40,7 +56,7 @@ void PacMan::updateAnimationPosition(std::chrono::milliseconds time_delta, bool
   if (paused) {
     pacManAnimation.pause();
   } else {
-    pacManAnimation.updateAnimationPosition(time_delta);
+    pacManAnimation.updateAnimationPosition(time_delta, eaten);
   }
 }
 

lib/PacMan.hpp

@@ -21,11 +21,18 @@ public:
 
   void update(std::chrono::milliseconds time_delta, InputState state, const Board & board);
 
+  void eat();
+  void reset(const Board & b);
+  bool onTheMove() const {
+    return direction != Direction::NONE;
+  }
+
 private:
   Direction direction = Direction::NONE;
   Direction desired_direction = Direction::NONE;
   Position pos;
   PacManAnimation pacManAnimation;
+  bool eaten = false;
 
   void setDirection(const InputState & state);
 

lib/PacManAnimation.cpp

@@ -16,9 +16,20 @@ PositionInt PacManAnimation::animationFrame(Direction direction) const {
   }
 }
 
-void PacManAnimation::updateAnimationPosition(std::chrono::milliseconds time_delta) {
+[[nodiscard]] PositionInt PacManAnimation::deathAnimationFrame(Direction direction) const {
+  return PositionInt{ animation_position, 1 };
+}
+
+void PacManAnimation::updateAnimationPosition(std::chrono::milliseconds time_delta, bool dead) {
+  if (dead && animation_position >= 11)
+    return;
+
   animation_position_delta += (0.02) * float(time_delta.count());
-  animation_position = int(animation_position + animation_position_delta) % 4;
+  animation_position = int(animation_position + animation_position_delta);
+
+  if (!dead)
+    animation_position = animation_position % 4;
+
   animation_position_delta = (animation_position_delta < 1) ? animation_position_delta : (animation_position_delta - 1);
 }
 

lib/PacManAnimation.hpp

@@ -11,8 +11,9 @@
 class PacManAnimation {
 public:
   [[nodiscard]] PositionInt animationFrame(Direction direction) const;
+  [[nodiscard]] PositionInt deathAnimationFrame(Direction direction) const;
 
-  void updateAnimationPosition(std::chrono::milliseconds time_delta);
+  void updateAnimationPosition(std::chrono::milliseconds time_delta, bool dead);
   void pause();
 
 private: