/// <summary>
    /// Generates a grayscale image from Voronoi noise, simulating district zones
    /// </summary>
    private void GenerateDistrctsMap()
    {
        // private texture2d
        districtMap = new Texture2D(gridWidth, gridWidth);
        Color[] pix = new Color[gridWidth * gridWidth];

        // private int
        seed = UnityEngine.Random.Range(0, 1000);

        // From a custom Voronoi class
        VoronoiNoise Voronoi = new VoronoiNoise(seed, frequency, amp);

        // Grid width atm is 60
        float[,] arr = new float[gridWidth, gridWidth];

        //Sample the 2D noise and add it into a array.
        for (int y = 0; y < gridWidth; y++)
        {
            for (int x = 0; x < gridWidth; x++)
            {
                float fx = x / (gridWidth - 1.0f);
                float fy = y / (gridWidth - 1.0f);

                arr[x, y] = Voronoi.Sample2D(fx, fy);
            }
        }

        for (int y = 0; y < gridWidth; y++)
        {
            for (int x = 0; x < gridWidth; x++)
            {
                float n = arr[x, y];
                districtMap.SetPixel(x, y, new Color(n, n, n, 1));
            }
        }

        districtMap.Apply();

        // districtBorderMap is a RawImage UI element
        districtBorderMap.texture = districtMap;
    }

    /// <summary>
    /// Floodfills district zones from districtBorderMap, uses borderThreshold for checking greyscale values on Voronoi borders.
    /// </summary>
    private void FloodfillDistricts()
    {
        // colorMap is a private Texture2D
        colorMap = new Texture2D(gridWidth, gridWidth);

        HashSet<Color> colors = new HashSet<Color>();
        Color[] pixels = districtMap.GetPixels();

        int width = colorMap.width;
        int height = colorMap.height;

        Stack<Vector2Int> stack = new Stack<Vector2Int>();

        for (int i = 0; i < pixels.Length; i++)
        {
            if (pixels[i].grayscale > borderThreshold)
            {
                Color color = new Color(UnityEngine.Random.value, UnityEngine.Random.value, UnityEngine.Random.value, 1);

                stack.Push(new Vector2Int(i % width, i / width));

                while (stack.Count > 0)
                {
                    Vector2Int pixelPos = stack.Pop();
                    int index = pixelPos.y * width + pixelPos.x;

                    if (pixels[index].grayscale > borderThreshold && !colors.Contains(pixels[index]))
                    {
                        pixels[index] = color;

                        if (pixelPos.x > 0) stack.Push(new Vector2Int(pixelPos.x - 1, pixelPos.y));
                        if (pixelPos.x < width - 1) stack.Push(new Vector2Int(pixelPos.x + 1, pixelPos.y));
                        if (pixelPos.y > 0) stack.Push(new Vector2Int(pixelPos.x, pixelPos.y - 1));
                        if (pixelPos.y < height - 1) stack.Push(new Vector2Int(pixelPos.x, pixelPos.y + 1));
                    }
                }

                colors.Add(color);
            }
        }

        colorMap.SetPixels(pixels);
        colorMap.Apply();

        districtColorMap.texture = colorMap;
    }