HexUtils

HexUtils.cs

using UnityEngine;

// Helper script to find out adjancent cells in a hexagonal grid
public static class HexGridUtils
{
    public readonly static Vector2Int[] EvenRowsTable = new Vector2Int[]
    {
        new Vector2Int(1, 0),
        new Vector2Int(0, -1),
        new Vector2Int(-1, -1),
        new Vector2Int(-1, 0),
        new Vector2Int(-1, 1),
        new Vector2Int(0, 1),
    };

    public readonly static Vector2Int[] OddRowsTable = new Vector2Int[]
{
        new Vector2Int(1, 0),
        new Vector2Int(1, -1),
        new Vector2Int(0, -1),
        new Vector2Int(-1, 0),
        new Vector2Int(0, 1),
        new Vector2Int(1, 1),
};

    public static Vector2Int[] GetOffsetTable(Vector2Int cell) => cell.y % 2 == 0 ? EvenRowsTable : OddRowsTable;

    public static bool IsAdjacentCell(Vector2Int primaryCell, Vector2Int otherCell)
    {
        Vector2Int[] table = GetOffsetTable(primaryCell);

        for (int i = 0; i < table.Length; i++)
        {
            if (primaryCell + table[i] == otherCell)
                return true;
        }

        return false;
    }
}