pawn moves check

Board.java

@@ -9,7 +9,7 @@ public class Board {
       board[i][2] = new Pawn(i + 1, 2, "Black");
     }
     for (int i = 0; i <= 7; i++) {
-      board[i][7] = new Pawn(i + 1, 7, "Black");
+      board[i][7] = new Pawn(i + 1, 7, "White");
     }
   }
 
@@ -20,4 +20,12 @@ public class Board {
       }
     }
   }
+
+  public static boolean inBounds(Position pos) {
+    return (pos.x >= 0 && pos.x <= 7) && (pos.y >= 0 && pos.y <= 7);
+  }
+
+  public boolean isOpen(Position pos) {
+    return this.board[pos.x][pos.y] == null;
+  }
 }

Knight.java

@@ -0,0 +1,24 @@
+import java.util.*;
+import javax.swing.ImageIcon;
+
+public class Knight extends Piece {
+  static int[] xDir = {-1, -2, -2, -1, 1, 2, 2, 1};
+  static int[] yDir = {-2, -1, 1, 2, 2, 1, -1, -2};
+
+  public Knight(int x, int y, String color) {
+    super(x, y, color, new ImageIcon("sprites/" + color + "/knight.png").getImage());
+  }
+
+  public ArrayList<Position> getLegalMoves(Board board) {
+    ArrayList<Position> positions = new ArrayList<Position>();
+
+    for (int i : xDir) {
+      for (int j : yDir) {
+        Position test = new Position(pos.x + i, pos.y + j);
+        if (!Board.inBounds(test)) continue;
+      }
+    }
+
+    return positions;
+  }
+}

Pawn.java

@@ -1,9 +1,40 @@
-import java.awt.*;
+import java.util.*;
 import javax.swing.ImageIcon;
 
 public class Pawn extends Piece {
+  boolean hasMoved;
+  int colorDir;
 
   public Pawn(int x, int y, String color) {
-    super(x, y, new ImageIcon("Sprites/" + color + "/pawn.png").getImage());
+    super(x, y, color, new ImageIcon("sprites/" + color + "/pawn.png").getImage());
+    hasMoved = false;
+    colorDir = color.equals("White") ? -1 : 1;
+  }
+
+  public ArrayList<Position> getLegalMoves(Board board) {
+    ArrayList<Position> positions = new ArrayList<Position>();
+    // diagonal moves (captures)
+    if (Board.inBounds(new Position(pos.x + 1, pos.y + colorDir))
+        && !board.isOpen(new Position(pos.x + 1, pos.y + colorDir))
+        && board.board[pos.x + 1][pos.y + colorDir].color != this.color) {
+      positions.add(new Position(pos.x + 1, pos.y + colorDir));
+    }
+    if (Board.inBounds(new Position(pos.x - 1, pos.y + colorDir))
+        && !board.isOpen(new Position(pos.x - 1, pos.y + colorDir))
+        && board.board[pos.x + 1][pos.y + colorDir].color != this.color) {
+      positions.add(new Position(pos.x - 1, pos.y + colorDir));
+    }
+
+    // one square in front: if blocked return early
+    if (Board.inBounds(new Position(pos.x, pos.y + colorDir))
+        && board.isOpen(new Position(pos.x, pos.y + colorDir))) {
+      positions.add(new Position(pos.x, pos.y + colorDir));
+    } else return positions;
+
+    // two squares in front
+    if (!hasMoved && board.isOpen(new Position(pos.x, pos.y + 2 * colorDir))) {
+      positions.add(new Position(pos.x, pos.y + 2 * colorDir));
+    }
+    return positions;
   }
 }

Piece.java

@@ -3,16 +3,22 @@ import java.util.*;
 
 public class Piece {
   ArrayList<Integer> legalMoves;
-  int x, y;
+  Position pos;
   Image sprite;
+  String color;
 
-  public Piece(int x, int y, Image sprite) {
+  public Piece(int x, int y, String color, Image sprite) {
-    this.x = x;
+    this.pos = new Position(x, y);
-    this.y = y;
+    this.color = color;
     this.sprite = sprite;
   }
 
   public void draw(Graphics g) {
-    g.drawImage(sprite, x * 40, y * 40, null);
+    g.drawImage(sprite, pos.x * 40, pos.y * 40, null);
+  }
+
+  public ArrayList<Position> getLegalMoves(Board board) {
+    System.out.println("parent method not overriden");
+    return null;
   }
 }

Position.java

@@ -0,0 +1,8 @@
+public class Position {
+  int x, y;
+
+  public Position(int x, int y) {
+    this.x = x;
+    this.y = y;
+  }
+}