Snake: Move geometry types into Geometry.h and add Direction enum

Userland/Games/Snake/Geometry.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2022, the SerenityOS developers.
+ * Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Format.h>
+
+namespace Snake {
+
+enum class Direction {
+    Up,
+    Right,
+    Down,
+    Left,
+};
+
+struct Coordinate {
+    int row { 0 };
+    int column { 0 };
+
+    bool operator==(Coordinate const& other) const
+    {
+        return row == other.row && column == other.column;
+    }
+};
+
+struct Velocity {
+    int vertical { 0 };
+    int horizontal { 0 };
+
+    Direction as_direction() const
+    {
+        if (vertical > 0)
+            return Direction::Down;
+        if (vertical < 0)
+            return Direction::Up;
+        if (horizontal > 0)
+            return Direction::Right;
+        if (horizontal < 0)
+            return Direction::Left;
+
+        return Direction::Up;
+    }
+};
+
+}