Implement PInky, Inky, and Clyde's chase behaviours

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

@@ -3,6 +3,7 @@ package com.me.pacman.entity;
 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.Target;
 import com.me.pacman.state.LevelState;
 
 public abstract class Entity {
@@ -29,6 +30,14 @@ public abstract class Entity {
         return (int) pos.x == (int) other.pos.x && (int) pos.y == (int) other.pos.y;
     }
 
+    public Vector2 getTileVector() {
+        return new Vector2((int) pos.x, (int) pos.y);
+    }
+
+    public Target getAsTarget() {
+        return new Target(pos.x, pos.y);
+    }
+
     public abstract TextureRegion getSprite();
 
     public void update(float dt) {

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

@@ -10,7 +10,7 @@ public class BlinkyChaseBehaviour extends Behaviour {
 
     @Override
     public Target getTarget() {
-        return new Target(state.pacman.pos);
+        return state.pacman.getAsTarget();
     }
 
 }

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

@@ -1,18 +0,0 @@
-package com.me.pacman.entity.ai;
-
-import com.me.pacman.PacDude;
-import com.me.pacman.state.PlayState;
-
-public class BlinkyScatterBehaviour extends Behaviour {
-
-    private static final Target target = new Target((PacDude.LEVEL_WIDTH / 8) - 2, PacDude.LEVEL_HEIGHT / 8);
-
-    public BlinkyScatterBehaviour(PlayState state) {
-        super(state);
-    }
-
-    @Override
-    public Target getTarget() {
-        return target;
-    }
-}

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

@@ -0,0 +1,18 @@
+package com.me.pacman.entity.ai;
+
+import com.badlogic.gdx.math.Vector2;
+import com.me.pacman.state.PlayState;
+
+public class ClydeChaseBehaviour extends Behaviour {
+
+    public ClydeChaseBehaviour(PlayState state) {
+        super(state);
+    }
+
+    @Override
+    public Target getTarget() {
+        Vector2 pacmanTile = state.pacman.getTileVector();
+        Vector2 clydeTile = state.ghosts[2].getTileVector();
+        return pacmanTile.dst2(clydeTile) >= 8*8? new Target(pacmanTile) : PlayState.CLYDE_SCATTER_TARGET;
+    }
+}

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

@@ -0,0 +1,20 @@
+package com.me.pacman.entity.ai;
+
+import com.badlogic.gdx.math.Vector2;
+import com.me.pacman.state.PlayState;
+
+public class InkyChaseBehaviour extends Behaviour {
+
+    public InkyChaseBehaviour(PlayState state) {
+        super(state);
+    }
+
+    @Override
+    public Target getTarget() {
+        Vector2 twoAheadPacman = state.pacman.currDirection.getVector(2).add(state.pacman.getTileVector());
+        Vector2 blinkyTile = state.ghosts[0].getTileVector();
+        float dst = twoAheadPacman.dst(blinkyTile);         // distance between Blinky + pacman
+        Vector2 dir = twoAheadPacman.sub(blinkyTile);       // direction from blink to pacman tile
+        return new Target(blinkyTile.add(dir.scl(dst * 2)));
+    }
+}

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

@@ -0,0 +1,16 @@
+package com.me.pacman.entity.ai;
+
+import com.me.pacman.state.PlayState;
+
+public class PinkyChaseBehaviour extends Behaviour {
+
+    public PinkyChaseBehaviour(PlayState state) {
+        super(state);
+    }
+
+    @Override
+    public Target getTarget() {
+        return new Target(state.pacman.currDirection.getVector(4).add(state.pacman.getTileVector()));
+    }
+
+}

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

@@ -0,0 +1,18 @@
+package com.me.pacman.entity.ai;
+
+import com.me.pacman.state.PlayState;
+
+public class StaticTargetBehaviour extends Behaviour {
+
+    private final Target target;
+
+    public StaticTargetBehaviour(PlayState state, Target target) {
+        super(state);
+        this.target = target;
+    }
+
+    @Override
+    public Target getTarget() {
+        return target;
+    }
+}

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

@@ -11,9 +11,7 @@ import com.me.pacman.PacDude;
 import com.me.pacman.entity.Direction;
 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.*;
-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;
 
@@ -21,6 +19,11 @@ import java.util.Random;
 
 public class PlayState extends LevelState {
 
+    public static final Target BLINKY_SCATTER_TARGET = new Target((PacDude.LEVEL_WIDTH / 8) - 2, PacDude.LEVEL_HEIGHT / 8);
+    public static final Target PINKY_SCATTER_TARGET = new Target(2, PacDude.LEVEL_HEIGHT / 8);
+    public static final Target INKY_SCATTER_TARGET = new Target(PacDude.LEVEL_WIDTH / 8, -1);
+    public static final Target CLYDE_SCATTER_TARGET = new Target(1, -1);
+
     private Texture levelBackground;
     private BitmapFont font;
 
@@ -239,8 +242,14 @@ 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] = new Ghost(this, 14, 19.5f, Direction.LEFT, 0, new BlinkyChaseBehaviour(this), new StaticTargetBehaviour(this, BLINKY_SCATTER_TARGET));
-        ghosts[0].currentBehaviour = ghosts[0].chaseBehaviour;
+        ghosts[1] = new Ghost(this, 14, 19.5f, Direction.LEFT, 1, new PinkyChaseBehaviour(this), new StaticTargetBehaviour(this, PINKY_SCATTER_TARGET));
+        ghosts[2] = new Ghost(this, 14, 19.5f, Direction.RIGHT, 2, new InkyChaseBehaviour(this), new StaticTargetBehaviour(this, INKY_SCATTER_TARGET));
+        ghosts[3] = new Ghost(this, 14, 19.5f, Direction.RIGHT, 3, new ClydeChaseBehaviour(this), new StaticTargetBehaviour(this, CLYDE_SCATTER_TARGET));
+
+        for (int i = 0; i < 4; i++) {
+            ghosts[i].currentBehaviour = ghosts[i].chaseBehaviour;
+        }
     }
 
     public void startGame() {