Implemented direction enum

gui-chess/src/main/java/com/gitea/lin/model/Direction.java

@@ -0,0 +1,53 @@
+package com.gitea.lin.model;
+
+public enum Direction {
+    // Orthogonal (Rook, Queen, King)
+    NORTH(0, -1),
+    SOUTH(0, 1),
+    EAST(1, 0),
+    WEST(-1, 0),
+
+    // Diagonal (Bishop, Queen, King, Pawn captures)
+    NORTH_EAST(1, -1),
+    NORTH_WEST(-1, -1),
+    SOUTH_EAST(1, 1),
+    SOUTH_WEST(-1, 1),
+
+    // Knight Jumps (L-shapes)
+    KNIGHT_NNE(1, -2),
+    KNIGHT_ENE(2, -1),
+    KNIGHT_ESE(2, 1),
+    KNIGHT_SSE(1, 2),
+    KNIGHT_SSW(-1, 2),
+    KNIGHT_WSW(-2, 1),
+    KNIGHT_WNW(-2, -1),
+    KNIGHT_NNW(-1, -2),
+
+    // Pawn Initial Double Push
+    PAWN_DOUBLE_NORTH(0, -2),
+    PAWN_DOUBLE_SOUTH(0, 2);
+
+    private final int dx;
+    private final int dy;
+
+    Direction(int dx, int dy) {
+        this.dx = dx;
+        this.dy = dy;
+    }
+
+    public int getDx() {
+        return dx;
+    }
+
+    public int getDy() {
+        return dy;
+    }
+
+    /**
+     * Converts the 2D vector into a 1D array offset for Piece[64].
+     * (Assuming index 0 is top-left a8 and 63 is bottom-right h1)
+     */
+    public int getFlatOffset() {
+        return dy * 8 + dx;
+    }
+}