Rudimentary ghost capturing

core/src/com/me/pacman/entity/Entity.java

@@ -18,7 +18,11 @@ public abstract class Entity {
     }
 
     public void render(SpriteBatch batch, int offsetX, int offsetY) {
-        batch.draw(getSprite(), (int) (pos.x * 8) + (offsetX - 8), (pos.y * 8) + (offsetY - 8));
+        TextureRegion texture = getSprite();
+        if (texture == null) {
+            return;
+        }
+        batch.draw(texture, (int) (pos.x * 8) + (offsetX - 8), (pos.y * 8) + (offsetY - 8));
     }
 
     public boolean onSameTile(Entity other) {

core/src/com/me/pacman/entity/Ghost.java

@@ -4,6 +4,7 @@ import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 import com.badlogic.gdx.graphics.g2d.TextureRegion;
 import com.badlogic.gdx.math.Vector2;
 import com.me.pacman.entity.ai.Behaviour;
+import com.me.pacman.entity.ai.ReturnToBase;
 import com.me.pacman.entity.ai.Target;
 import com.me.pacman.level.LevelTile;
 import com.me.pacman.state.PlayState;
@@ -23,6 +24,8 @@ public class Ghost extends MovableEntity {
     public Behaviour frightBehaviour;
 
     public TextureRegion[][] sprite;
+    public boolean caught;
+    public boolean returned;
 
     private int spriteIndex;
     private int counter = 0;
@@ -35,19 +38,28 @@ public class Ghost extends MovableEntity {
         this.chaseBehaviour = chaseBehaviour;
         this.scatterBehaviour = scatterBehaviour;
         this.frightBehaviour = new FrightenedBehaviour(state);
+        this.caught = false;
+        this.returned = true;
         sprite = state.getGame().assets.ghosts;
     }
 
     @Override
     public TextureRegion getSprite() {
+        if (caught) {
+            return null;
+        } else if (state.frightTimer > 0 && !returned) {
+            return sprite[0][counter % 2];
+        } else {
             return sprite[2 + (counter % 2)][spriteIndex];
         }
+    }
 
     @Override
     public void render(SpriteBatch batch, int offsetX, int offsetY) {
         super.render(batch, offsetX, offsetY);
 
         // draw eyes so the ghost can see
+        if (state.frightTimer <= 0 || caught || returned)
             batch.draw(sprite[1][currDirection.ordinal()], (int) (pos.x * 8) + (offsetX - 8), (pos.y * 8) + (offsetY - 8));
     }
 
@@ -73,6 +85,12 @@ public class Ghost extends MovableEntity {
             return;
         }
 
+        if (currentBehaviour instanceof ReturnToBase && target.targetReached(pos)) {
+            caught = false;
+            returned = true;
+            currentBehaviour = chaseBehaviour;
+        }
+
         Vector2 ahead = new Vector2((int) pos.x, (int) pos.y).add(currDirection.getVector());
         float shortest = Float.MAX_VALUE;
         Direction nextDirection = null;
@@ -96,21 +114,6 @@ public class Ghost extends MovableEntity {
         setNextDirection(nextDirection);
     }
 
-    private class ReturnToBase extends Behaviour {
-
-        final Target home = new Target(14, 16);
-
-        public ReturnToBase(PlayState state) {
-            super(state);
-        }
-
-        @Override
-        public Target getTarget() {
-            return home;
-        }
-
-    }
-
     private class FrightenedBehaviour extends Behaviour {
 
         private Target target;

core/src/com/me/pacman/entity/ai/ReturnToBase.java

@@ -0,0 +1,19 @@
+package com.me.pacman.entity.ai;
+
+import com.me.pacman.state.PlayState;
+
+public class ReturnToBase extends Behaviour {
+
+//        final Target home = new Target(14, 16);
+    final Target home = new Target(14, 19);
+
+    public ReturnToBase(PlayState state) {
+        super(state);
+    }
+
+    @Override
+    public Target getTarget() {
+        return home;
+    }
+
+}

core/src/com/me/pacman/state/PlayState.java

@@ -13,6 +13,7 @@ import com.me.pacman.entity.Ghost;
 import com.me.pacman.entity.Pacman;
 import com.me.pacman.entity.ai.BlinkyChaseBehaviour;
 import com.me.pacman.entity.ai.BlinkyScatterBehaviour;
+import com.me.pacman.entity.ai.ReturnToBase;
 import com.me.pacman.level.Level;
 import com.me.pacman.level.LevelTile;
 
@@ -38,6 +39,7 @@ public class PlayState extends LevelState {
     private float gameOverTimer;
     private float newGameTimer;
     private float deathTimer;
+    public float frightTimer;
 
     private boolean pacmanCaught;
 
@@ -131,7 +133,15 @@ public class PlayState extends LevelState {
             }
         }
 
-        dt = 1/60f;
+        if (frightTimer > 0) {
+            frightTimer -= dt;
+            if (frightTimer < 0) {
+                for (Ghost ghost : ghosts) {
+                    if (ghost == null || ghost.caught) continue;
+                    ghost.currentBehaviour = ghost.chaseBehaviour;
+                }
+            }
+        }
 
         if (!pacmanCaught) {
             for (Ghost ghost : ghosts) {
@@ -141,10 +151,14 @@ public class PlayState extends LevelState {
                 ghost.update(dt);
 
                 if (ghost.onSameTile(pacman)) {
+                    if (frightTimer > 0) {
+                        if (!ghost.caught) ghostCaught(ghost);
+                    } else {
                         pacmanCaught();
                         return;
                     }
                 }
+            }
         } else if (deathTimer <= 0) {
             if (pacman.alive) {
                 game.assets.deathSound.play(1f);
@@ -220,7 +234,7 @@ public class PlayState extends LevelState {
 
     public void placeGhosts() {
         ghosts[0] = new Ghost(this, 14, 19.5f, Direction.LEFT, 0, new BlinkyChaseBehaviour(this), new BlinkyScatterBehaviour(this));
-        ghosts[0].currentBehaviour = ghosts[0].scatterBehaviour;
+        ghosts[0].currentBehaviour = ghosts[0].chaseBehaviour;
     }
 
     public void startGame() {
@@ -250,7 +264,12 @@ public class PlayState extends LevelState {
 
     public void eatPowerPellet(float x, float y) {
         pelletEaten(x, y);
-        // TODO: Enable ghost chase mode
+        for (Ghost ghost : ghosts) {
+            if (ghost == null || ghost.caught) continue;
+            ghost.currentBehaviour = ghost.frightBehaviour;
+            ghost.returned = false;
+        }
+        frightTimer = 6f;
         score += 50;
     }
 
@@ -261,6 +280,11 @@ public class PlayState extends LevelState {
         pacman.moving = false;
     }
 
+    private void ghostCaught(Ghost ghost) {
+        ghost.caught = true;
+        ghost.returned = false;
+        ghost.currentBehaviour = new ReturnToBase(this);
+    }
 
     @Override
     public void dispose() {