Castling Fix

Michael _Edit's_(non_destructive)/Board.java

@@ -40,7 +40,6 @@ public class Board {
     }
 
     public boolean movePiece(int x, int y, int newX, int newY){
-        // System.out.println(x + " " + y + " || " + newX + " " + newY);
         ChessPiece selectedPiece;
         // make sure the place we are moving from has a piece
         if ((selectedPiece = get(x, y)) == null)
@@ -83,11 +82,12 @@ public class Board {
                 }
             }
         }
+
         return moveStates;
     }
 
     public int evaluate () { // !!!!!!!! Fix this, add actual heuristic evaluation
-        return (int)Math.random()*900;
+        return (int)(Math.random()*10);
     }
 
     public Board deepCopy () {

Michael _Edit's_(non_destructive)/Display.java

@@ -0,0 +1,130 @@
+package project.ui;
+
+import project.chess.Board;
+import project.chess.ChessPiece;
+import project.chess.Move;
+
+import javax.imageio.ImageIO;
+import javax.swing.*;
+import javax.swing.text.AttributeSet;
+import java.awt.*;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.io.File;
+import java.io.IOException;
+import java.text.AttributedString;
+import java.util.ArrayList;
+
+public class Display extends JFrame implements MouseListener {
+
+    private static int xOffset = 128, yOffset = 128;
+    private static int width = 64, height = 64;
+    private int movingPointX = -1, movingPointY = -1;
+    private int selectionPointX = -1, selectionPointY = -1;
+
+    private Board b;
+
+    public Display(Board b){
+        this.b = b;
+        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+        this.setSize(800, 800);
+        this.setVisible(true);
+        this.setEnabled(true);
+        this.setTitle("Ratatta");
+        this.addMouseListener(this);
+    }
+
+    @Override
+    public void paint(Graphics g) {
+        super.paint(g);
+        for (int i = 0; i < b.size(); i++){
+            for (int j = 0; j < b.size(); j++){
+                ChessPiece p;
+                p = b.get(i,j);
+                if (p != null)
+                    g.drawImage(p.getImage(), xOffset + (i) * width, yOffset + (j) * height, null);
+            }
+        }
+        if (movingPointX != -1 && movingPointY != -1) {
+            ChessPiece piece;
+            piece = b.get(movingPointX, movingPointY);
+            if (piece != null) {
+                ArrayList<Move> moves;
+                moves = piece.getMoves();
+                for (Move m : moves) {
+                    drawSelectionRect(g, m);
+                }
+                if (selectionPointX != -1 && selectionPointY != -1) {
+                    int localPointX = (selectionPointX - xOffset) / width;
+                    int localPointY = (b.size() - 1) - ((selectionPointY - yOffset) / height);
+                    for (Move m : moves){
+                        if (m.getX() == localPointX && m.getY() == localPointY){
+                            b.movePiece(piece.getPosition(), new Move(localPointX, localPointY));
+                            selectionPointX = -1;
+                            selectionPointY = -1;
+                            movingPointX = -1;
+                            movingPointY = -1;
+                            return;
+                        }
+                    }
+                }
+            }
+        }
+        // handle user input (mouse clicking)
+        if (selectionPointX != -1 && selectionPointY != -1){
+            int localPointX = (selectionPointX - xOffset) / width;
+            int localPointY = (b.size()-1) - ((selectionPointY - yOffset) / height);
+            ChessPiece piece;
+            piece = b.get(localPointX, localPointY);
+            if (piece != null) {
+                movingPointX = localPointX;
+                movingPointY = localPointY;
+            }
+            selectionPointY = -1;
+            selectionPointX = -1;
+        }
+    }
+
+    private void drawSelectionRect(Graphics g, Move m){
+        g.drawRect(xOffset + (m.getX() * width), yOffset + ((b.size()-1 - m.getY()) * height), width, height);
+    }
+
+    public boolean update(Board newerBoard){
+        this.b = newerBoard;
+        return true;
+    }
+
+    public static Image loadImage(String path){
+        try {
+            return new ImageIcon(ImageIO.read(new File(path))).getImage();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public void mouseClicked(MouseEvent mouseEvent) {
+        this.selectionPointX = mouseEvent.getX();
+        this.selectionPointY = mouseEvent.getY();
+    }
+
+    @Override
+    public void mousePressed(MouseEvent mouseEvent) {
+
+    }
+
+    @Override
+    public void mouseReleased(MouseEvent mouseEvent) {
+
+    }
+
+    @Override
+    public void mouseEntered(MouseEvent mouseEvent) {
+
+    }
+
+    @Override
+    public void mouseExited(MouseEvent mouseEvent) {
+
+    }
+}

Michael _Edit's_(non_destructive)/Main.java

@@ -11,23 +11,24 @@ public class Main {
     public static void main(String[] args) {
         Board mainBoard = new Board();
 
-        int maxDepth = 2;
+        int maxDepth = 5;
         Board[] bestStates = new Board[maxDepth];
 
-        minMax(mainBoard,bestStates,maxDepth,true);
+        alphaBeta(mainBoard,bestStates,maxDepth,Integer.MIN_VALUE,Integer.MAX_VALUE,true);
 
         System.out.println("Ai Done Computing");
         
-        int counter = 0;
+
 
         // mainBoard.getMoves();
 
         // display stuff //
         Display display = new Display(mainBoard);
+        int counter = 0;
         long frames = 0;
         long lastTime = System.currentTimeMillis();
         long frameTime = System.currentTimeMillis();
-        while(display.update(mainBoard)){
+        while(display.update(bestStates[counter%(maxDepth+1)])){
             display.repaint();
             // limit usage of system resources by slowing the speed down to 60 fps.
             while ((System.currentTimeMillis() - frameTime) < 64f){
@@ -47,25 +48,49 @@ public class Main {
                 TimeUnit.SECONDS.sleep(1);
             } catch (Exception ignored) {}
 
-            mainBoard = bestStates[counter%maxDepth];
-
             counter++;
 
         }
+
         System.out.println("Hello world!");
 
 
     }
 
-    /*
+    public static int alphaBeta (Board position, Board[] bestStates, int depth, int alpha, int beta, boolean maximizing) {
-    public int alphaBeta (Board position, int depth, int alpha, int beta, boolean maximizing) {
+        if (depth == 0) {
-        if (depth == 0 || position.kingInDanger) return Board.evaluate(position);
+            bestStates[depth] = position;
+            return position.evaluate();
+        }
+
+        System.out.println(depth);
 
         if (maximizing) {
             int maxEval = Integer.MIN_VALUE;
-            position.
+            for (Board state: position.getMoves(maximizing) ) {
+                int eval = alphaBeta(state,bestStates,depth-1, alpha,beta,false);
+                maxEval = Math.max(maxEval,eval);
+                alpha = Math.max(alpha,eval);
+                if (beta <= alpha) {
+                    break;
+                }
+            }
+            bestStates[depth-1] = position;
+            return maxEval;
+        } else {
+            int minEval = Integer.MAX_VALUE;
+            for (Board state: position.getMoves(maximizing) ) {
+                int eval = alphaBeta(state,bestStates,depth-1,alpha,beta,true);
+                minEval = Math.min(minEval,eval);
+                beta = Math.min(beta,eval);
+                if (beta <= alpha) {
+                    break;
+                }
+            }
+            bestStates[depth-1] = position;
+            return minEval;
         }
-    } */
+    }
 
     public static int minMax (Board position, Board[] bestStates, int depth, boolean maximizing) {
         if (depth == 0) {

src/chess/King.java

@@ -54,11 +54,17 @@ public class King extends ChessPiece {
 
     private void castleRight(){
         // casting has to move the rook on the right size of the king from white's perspective
-        if (this.isWhite)
+        if (this.isWhite) {
-            b.movePiece(b.size() - 1, 0, b.size() - 3, 0);
+            var p = b.get(b.size() - 1, 0);
-        else
+            p.move(new Move(b.size() - 3, 0));
-            b.movePiece(b.size()-1, b.size()-1, b.size()-3, b.size()-1)
+            b.set(b.size() - 3, 0, p);
-            b.set(b.size()-3, b.size()-1, b.get(b.size()-1, b.size()-1));
+            b.set(b.size() - 1, 0, null);
+        } else {
+            var p =  b.get(b.size() - 1, b.size() - 1);
+            p.move(new Move(b.size() - 3, b.size() - 1));
+            b.set(b.size() - 3, b.size() - 1, p);
+            b.set(b.size() - 1, b.size() - 1, null);
+        }
     }
 
     private boolean checkIfRookValid(ChessPiece piece){
@@ -67,9 +73,16 @@ public class King extends ChessPiece {
 
     private void castleLeft(){
         // casting has to move the rook on the left size of the king from white's perspective
-        if (this.isWhite)
+        if (this.isWhite) {
-            b.set(3, 0, b.get(0, 0));
+            var p = b.get(0, 0);
-        else
+            p.move(new Move(3, 0));
-            b.set(3, b.size()-1, b.get(0, b.size()-1));
+            b.set(3, 0, p);
+            b.set(0, 0, null);
+        } else {
+            var p = b.get(0, b.size() - 1);
+            p.move(new Move(3, b.size() - 1));
+            b.set(3, b.size() - 1, p);
+            b.set(0, b.size() - 1, null);
+        }
     }
 }