uebung02 aufgabe 1

uebung02/chess/Piece.java

@@ -25,6 +25,8 @@ class Piece {
                 return queenCharRep();
             case KNIGHT:
                 return knightCharRep();
+            case ROOK: 
+                return rookCharRep();
         }
         throw new IllegalArgumentException("Unknown piece " + kind);
     }
@@ -35,6 +37,8 @@ class Piece {
                 return queenShowPiece();
             case KNIGHT:
                 return knightShowPiece();
+            case ROOK:
+                return rookShowPiece();
         }
         throw new IllegalArgumentException("Unknown piece " + kind);
     }
@@ -45,6 +49,8 @@ class Piece {
                 return queenCanCapture(other);
             case KNIGHT:
                 return knightCanCapture(other);
+            case ROOK:
+                return rookCanCapture(other);
         }
         throw new IllegalArgumentException("Unknown piece " + kind);
     }
@@ -63,6 +69,14 @@ class Piece {
             return 'N';
     }
 
+    char rookCharRep() {
+        if (color == Color.WHITE) {
+            return 'r';
+        } else {
+            return 'R';
+        }
+    }
+
     String queenShowPiece() {
         return "" + color.toString().toLowerCase() + " queen at (" + row + ", " + col + ")";
     }
@@ -71,6 +85,10 @@ class Piece {
         return "" + color.toString().toLowerCase() + " knight at (" + row + ", " + col + ")";
     }
 
+    String rookShowPiece() {
+        return "" + color.toString().toLowerCase() + " rook at (" + row + ", " + col + ")";
+    }
+
     boolean queenCanCapture(Piece other) {
         if (board != other.board || color == other.color)
             return false;
@@ -97,4 +115,22 @@ class Piece {
         final int dc = abs(col - other.col);
         return dr == 2 && dc == 1 || dr == 1 && dc == 2;
     }
+
+    boolean rookCanCapture(Piece other) {
+        if (board != other.board || color == other.color)
+            return false;
+        if (other.row != row && other.col != col )
+            return false;
+        final int dr = signum(other.row - row);
+        final int dc = signum(other.col - col);
+        int r = row + dr;
+        int c = col + dc;
+        while (r != other.row || c != other.col) {
+            if (board.pieceAt(r, c) != null) return false;
+            r += dr;
+            c += dc;
+        }
+        return true;
+    }
+
 }