added rook, created bishop file

Rook.java

@@ -0,0 +1,72 @@
+import java.util.*;
+import javax.swing.ImageIcon;
+
+public class Rook extends Piece {
+  boolean hasMoved;
+
+  public Rook(int x, int y, String color) {
+    super(x, y, color, new ImageIcon("sprites/" + color + "/rook.png").getImage());
+    hasMoved = false;
+  }
+
+  public ArrayList<Position> getLegalMoves(Board board) {
+    ArrayList<Position> positions = new ArrayList<Position>();
+
+    // check left
+    for (int i = pos.x - 1; i >= 0; i--) {
+      Position test = new Position(i, pos.y);
+      if (board.isOpen(test)) {
+        positions.add(test);
+        continue;
+      } else if (board.getPiece(test).colorMatches(this)) {
+        break;
+      } else {
+        positions.add(test);
+        break;
+      }
+    }
+
+    // check right
+    for (int i = pos.x + 1; i <= 7; i++) {
+      Position test = new Position(i, pos.y);
+      if (board.isOpen(test)) {
+        positions.add(test);
+        continue;
+      } else if (board.getPiece(test).colorMatches(this)) {
+        break;
+      } else {
+        positions.add(test);
+        break;
+      }
+    }
+
+    // check up
+    for (int i = pos.y + 1; i <= 7; i++) {
+      Position test = new Position(pos.x, i);
+      if (board.isOpen(test)) {
+        positions.add(test);
+        continue;
+      } else if (board.getPiece(test).colorMatches(this)) {
+        break;
+      } else {
+        positions.add(test);
+        break;
+      }
+    }
+
+    // check down
+    for (int i = pos.y - 1; i >= 0; i--) {
+      Position test = new Position(pos.x, i);
+      if (board.isOpen(test)) {
+        positions.add(test);
+        continue;
+      } else if (board.getPiece(test).colorMatches(this)) {
+        break;
+      } else {
+        positions.add(test);
+        break;
+      }
+    }
+    return positions;
+  }
+}