Grid

using UnityEngine;

/// <summary>
/// Templated 2D grid class.
/// </summary>
/// <typeparam name="T">Grid data type</typeparam>
public class Grid<T>
{
    /// <summary>
    /// Holds the grid data.
    /// </summary>
    T[] data;

    /// <summary>
    /// Size of the grid.
    /// </summary>
    public Vector2Int Size { get; private set; }

    /// <summary>
    /// Grid offset.
    /// </summary>
    public Vector2Int Offset { get; set; }

    /// <summary>
    /// Default constructor.
    /// </summary>
    /// <param name="size">Size of the grid</param>
    /// <param name="offset">Offset of the grid</param>
    public Grid(Vector2Int size, Vector2Int offset)
    {
        Size = size;
        Offset = offset;

        data = new T[size.x * size.y];
    }

    /// <summary>
    /// Get index of grid data based on 2D position.
    /// </summary>
    /// <param name="position">2D position to get index of</param>
    /// <returns>Index of grid data</returns>
    public int GetIndex(Vector2Int position)
    {
        return position.x + position.y * Size.x;
    }

    /// <summary>
    /// Is the given position inside the grid?
    /// </summary>
    /// <param name="position">2D position to check</param>
    /// <returns>True when inside the grid, false otherwise</returns>
    public bool IsInside(Vector2Int position)
    {
        return position.x >= 0 && position.x < Size.x && position.y >= 0 && position.y < Size.y;
    }

    /// <summary>
    /// Get data at the given position (with x and y coordinates).
    /// </summary>
    /// <param name="x">X coordinate</param>
    /// <param name="y">Y coordinate</param>
    /// <returns>Value at the given position</returns>
    public T this[int x, int y]
    {
        get
        {
            return this[new Vector2Int(x, y)];
        }

        set
        {
            this[new Vector2Int(x, y)] = value;
        }
    }

    /// <summary>
    /// Get data at the given position (with Vector2Int).
    /// </summary>
    /// <param name="position">Position to get data of</param>
    /// <returns>Value at the given position</returns>
    public T this[Vector2Int position]
    {
        get
        {
            position += Offset;
            return data[GetIndex(position)];
        }

        set
        {
            position += Offset;
            data[GetIndex(position)] = value;
        }
    }
}