DEV: First try of a tree

src/gr/auth/ee/dsproject/node/Globals.java

@@ -53,7 +53,7 @@ public class Globals {
    /*
     * Tree settings
     */
-   public static final int MINMAXTREE_MAX_DEPTH = 2;
+   public static final int MINMAXTREE_MAX_DEPTH = 2;  // MUST be multiple of 2
 
    /*
     * In order to find out when a ghost is inside a cavity we manualy

src/gr/auth/ee/dsproject/node/MinMaxTree.java

@@ -58,7 +58,7 @@ public class MinMaxTree
     * @return        Reference to inserted node
     *                If insert fail, returns null
     */
-   public Node89978445 insert (Node89978445 node, Node89978445 parent) {
+   public static Node89978445 insert (Node89978445 node, Node89978445 parent) {
       if (parent.children.add (node)) {
          node.parent = parent;
          return node;
@@ -75,7 +75,7 @@ public class MinMaxTree
     * @return        Reference to the child with the minimum evaluation value
     *                If parent has no children null.
     */
-   public Node89978445 minChild (Node89978445 parent)
+   public static Node89978445 minChild (Node89978445 parent)
    {
       Node89978445 node = null;
       double ev, min = Globals.EVAL_MAX+1;
@@ -97,7 +97,7 @@ public class MinMaxTree
     * @return        Reference to the child with the maximum evaluation value
     *                If parent has no children null.
     */
-   public Node89978445 maxChild (Node89978445 parent)
+   public static Node89978445 maxChild (Node89978445 parent)
    {
       Node89978445 node = null;
       double ev, max = Globals.EVAL_MIN-1;

src/gr/auth/ee/dsproject/node/Node89978445.java

@@ -29,7 +29,7 @@ public class Node89978445
                             * Pacman's current move evaluation
                             * This is used also as the "return status" of the object
                             */
-   int[] nodeXY;        // Pacman's current x,y coordinate
+   int[] nodeXY;                 // Pacman's current x,y coordinate
    int[][] currentGhostPos;      // Array holding the Ghost (x,y) pairs
    
    
@@ -68,7 +68,7 @@ public class Node89978445
       currentGhostPos = new int [PacmanUtilities.numberOfGhosts][2];
       flagPos = new int [PacmanUtilities.numberOfFlags][2];
       currentFlagStatus = new boolean[PacmanUtilities.numberOfFlags];
-      ArrayList<Node89978445> children = new ArrayList<Node89978445> ();
+      children = new ArrayList<Node89978445> ();
    }
 
    /**
@@ -88,7 +88,7 @@ public class Node89978445
       currentGhostPos = new int [PacmanUtilities.numberOfGhosts][2];
       flagPos = new int [PacmanUtilities.numberOfFlags][2];
       currentFlagStatus = new boolean[PacmanUtilities.numberOfFlags];
-      ArrayList<Node89978445> children = new ArrayList<Node89978445> ();
+      children = new ArrayList<Node89978445> ();
    }
 
    /*
@@ -134,6 +134,13 @@ public class Node89978445
          return nodeEvaluation;
     }
 
+   public int[] getCurentPacmanPos () {
+      return nodeXY;
+   }
+   public int[][] getCurrentGhostPos () {
+      return currentGhostPos;
+   }
+
    /*
     * ============= Helper API ============
     */

src/gr/auth/ee/dsproject/pacman/Creature.java

@@ -47,58 +47,78 @@ public class Creature implements gr.auth.ee.dsproject.pacman.AbstractCreature
   /**
    * @brief
    *    Create node for each one of the possible moves (0, 1, 2, 3) and
-   *    evaluate these moves. After that feeds the valid ones to an ArrayList
-   *    and select the best of them to return
+   *    evaluate these moves.
    */
-//   public int calculateNextPacmanPosition (Room[][] Maze, int[] currPosition)
-//   {
-//      Node89978445 node = new Node89978445 ();  // make a dummy node
-//      MinMaxTree rt = new MinMaxTree (node);    /*<
-//                                                 * Plant a tree with dummy root
-//                                                 * Null parent and no evaluation
-//                                                 */
-//      
-//      createSubTreePacman (0,node, Maze, currPosition);
-//      return 0;
-//   }
-  public int calculateNextPacmanPosition (Room[][] Maze, int[] currPosition)
-  {
-     Node89978445 cur = new Node89978445 (Maze, currPosition);
-     Node89978445 moveNode;
-     //ArrayList<Node89978445> moveNodes = new ArrayList<Node89978445> ();
-     double ev, max = Globals.NO_EVAL;
-     int decision = -1;
-     
-     int[] nextPosition = {-1, -1};
-
-     /*
-      *  loop the possible moves and fill them to list
-      *  mark the move with the maximum evaluation value
-      */
-     for (int i=0 ; i<4 ; ++i) {
-        if ((nextPosition = Node89978445.pacmanValidMove(cur, i)) != Globals.FALSE_POS) {
-           moveNode = new Node89978445 (Maze, nextPosition);
-           ev = moveNode.getEvaluation();
-           if (ev > max) {
-              max = ev;
-              decision = i;
-           }
-        }
-     }
-     return decision;
-  }
-
-  void createSubTreePacman (int depth, Node89978445 parent, Room[][] Maze, int[] currPacmanPosition)
-  {
-
-    // TODO Fill This
-
-  }
+   public int calculateNextPacmanPosition (Room[][] Maze, int[] currPosition)
+   {
+      Node89978445 cur = new Node89978445 (Maze, currPosition);
+      MinMaxTree mmTree = new MinMaxTree (cur);    /*<
+                                                    * Plant a tree with dummy root
+                                                    * Null parent and no evaluation
+                                                    */
+      
+      createSubTreePacman (0, cur, Maze, currPosition);  //make the tree
+      // min-max
+      return 0;
+   }
+
+   void createSubTreePacman (int depth, Node89978445 parent, Room[][] Maze, int[] curPacmanPosition)
+   {
+      if (++depth > Globals.MINMAXTREE_MAX_DEPTH)
+         return;
+      else {
+         Node89978445 newNode;
+         Room[][] newMaze;
+         int[] nextPosition = {-1, -1};
+
+         // scan possible valid moves
+         for (int move=0 ; move<4 ; ++move) {
+            if ((nextPosition = Node89978445.pacmanValidMove (parent, move)) != Globals.FALSE_POS) {
+               // Make a copy of the maze in order to simulate next move and move Pacman
+               newMaze = PacmanUtilities.copy (Maze);
+               PacmanUtilities.movePacman (newMaze, parent.getCurentPacmanPos(), nextPosition);
+         
+               // Create a node for the move in the new stated game maze
+               newNode = new Node89978445 (newMaze, nextPosition);
+               newNode.getEvaluation();
+               MinMaxTree.insert (newNode, parent);   // add node to the min-max tree
+
+               // call the recursive ranch creator
+               createSubTreeGhosts (depth, newNode, newMaze, newNode.getCurrentGhostPos());
+            }
+         }
+      }
+   }
 
-  void createSubTreeGhosts (int depth, Node89978445 parent, Room[][] Maze, int[][] currGhostsPosition)
-  {
-    // TODO Fill This
-  }
+   void createSubTreeGhosts (int depth, Node89978445 parent, Room[][] Maze, int[][] currGhostsPosition)
+   {
+      if (++depth > Globals.MINMAXTREE_MAX_DEPTH)
+         return;
+      else {
+         Node89978445 newNode;
+         Room[][] newMaze;
+         ArrayList<int[][]> ghostMoves;
+         
+         // Get all possible ghost moves
+         ghostMoves = PacmanUtilities.allGhostMoves(Maze, currGhostsPosition);
+
+         // loop all ghost moves
+         int s = ghostMoves.size();
+         for (int i=0 ; i<s ; ++i) {
+            // Make a copy of the maze in order to simulate next move and move ghosts
+            newMaze = PacmanUtilities.copy (Maze);
+            PacmanUtilities.moveGhosts(newMaze, currGhostsPosition, ghostMoves.get(i));
+            
+            // Create a node for the move in the new stated game maze
+            newNode = new Node89978445 (newMaze, parent.getCurentPacmanPos());
+            newNode.getEvaluation();
+            MinMaxTree.insert (newNode, parent);   // add node to the min-max tree
+
+            //recursive call for the rest of the tree
+            //createSubTreePacman (depth, newNode, newMaze, parent.getCurentPacmanPos());
+         }
+      }
+   }
 
   public int[] getPacPos (Room[][] Maze)
   {