Ex 162: Refactor ghost state out of game state.

lib/Canvas.cpp

@@ -36,10 +36,10 @@ void Canvas::render(const GameState & gameState) {
   renderPellets(gameState.pellets);
   renderSuperPellets(gameState.superPellets);
 
-  renderGhost(gameState.blinky);
-  renderGhost(gameState.pinky);
-  renderGhost(gameState.inky);
-  renderGhost(gameState.dave);
+  renderGhost(gameState.ghosts.blinky);
+  renderGhost(gameState.ghosts.pinky);
+  renderGhost(gameState.ghosts.inky);
+  renderGhost(gameState.ghosts.dave);
 
   renderScore(gameState.score.points);
   renderLives(gameState.score.lives);

lib/GameState.cpp

@@ -18,21 +18,11 @@ void GameState::step(std::chrono::milliseconds delta) {
   if (!pacMan.hasDirection())
     return;
 
-  blinky.setTarget(pacMan.position());
-  blinky.update(delta);
-  pinky.setTarget(pacMan.positionInGrid(), pacMan.currentDirection());
-  pinky.update(delta);
-  inky.setTarget(pacMan.positionInGrid(), pacMan.currentDirection(), blinky.positionInGrid());
-  inky.update(delta);
-  dave.setTarget(pacMan.position());
-  dave.update(delta);
+  ghosts.setTarget(pacMan.positionInGrid(), pacMan.currentDirection());
+  ghosts.update(delta);
 
   fruit.update(delta, score.eatenPellets);
-
-  checkCollision(blinky);
-  checkCollision(pinky);
-  checkCollision(inky);
-  checkCollision(dave);
+  ghosts.checkCollision(*this);
 
   eatPellets();
   eatFruit();
@@ -58,10 +48,7 @@ void GameState::handleDeathAnimation(std::chrono::milliseconds delta) {
   timeSinceDeath += delta;
 
   if (timeSinceDeath.count() > 1000) {
-    blinky.reset();
-    pinky.reset();
-    inky.reset();
-    dave.reset();
+    ghosts.reset();
     pacMan.reset();
     pacManAI.reset();
     timeSinceDeath = std::chrono::milliseconds(0);
@@ -78,11 +65,7 @@ void GameState::eatPellets() {
   if (superPellets.eatPelletAtPosition(pos)) {
     score.eatenPellets++;
     score.points += POWER_PELLET_POINTS;
-
-    blinky.frighten();
-    pinky.frighten();
-    inky.frighten();
-    dave.frighten();
+    ghosts.frighten();
   }
 }
 

lib/GhostState.cpp

@@ -0,0 +1,41 @@
+#include "GhostState.hpp"
+#include "GameState.hpp"
+
+namespace pacman {
+
+void GhostState::setTarget(GridPosition pacManPosition, Direction pacManDirection) {
+  blinky.setTarget(gridPositionToPosition(pacManPosition));
+  pinky.setTarget(pacManPosition, pacManDirection);
+  inky.setTarget(pacManPosition, pacManDirection, blinky.positionInGrid());
+  dave.setTarget(gridPositionToPosition(pacManPosition));
+}
+
+void GhostState::update(std::chrono::milliseconds delta) {
+  blinky.update(delta);
+  pinky.update(delta);
+  inky.update(delta);
+  dave.update(delta);
+}
+
+void GhostState::checkCollision(GameState & gameState) {
+  gameState.checkCollision(blinky);
+  gameState.checkCollision(pinky);
+  gameState.checkCollision(inky);
+  gameState.checkCollision(dave);
+}
+
+void GhostState::reset(void) {
+  blinky.reset();
+  pinky.reset();
+  inky.reset();
+  dave.reset();
+}
+
+void GhostState::frighten(void) {
+  blinky.frighten();
+  pinky.frighten();
+  inky.frighten();
+  dave.frighten();
+}
+
+} // namespace pacman

lib/include/GameState.hpp

@@ -4,6 +4,7 @@
 #include "Dave.hpp"
 #include "Fruits.hpp"
 #include "Ghost.hpp"
+#include "GhostState.hpp"
 #include "Inky.hpp"
 #include "InputState.hpp"
 #include "PacMan.hpp"
@@ -18,10 +19,7 @@ namespace pacman {
 struct GameState {
   void step(std::chrono::milliseconds delta);
 
-  Blinky blinky;
-  Pinky pinky;
-  Inky inky;
-  Dave dave;
+  GhostState ghosts;
 
   PacMan pacMan;
   PacManAI pacManAI;

lib/include/GhostState.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "Blinky.hpp"
+#include "Dave.hpp"
+#include "Inky.hpp"
+#include "Pinky.hpp"
+
+namespace pacman {
+
+class GameState;
+
+class GhostState {
+public:
+  void setTarget(GridPosition pacManPosition, Direction pacManDirection);
+  void update(std::chrono::milliseconds delta);
+  void checkCollision(GameState & gameState);
+  void reset();
+  void frighten();
+
+  Blinky blinky;
+  Pinky pinky;
+  Inky inky;
+  Dave dave;
+};
+
+} // namespace pacman