Images

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Text.RegularExpressions;

namespace Images
{
    class Program
    {
        private const int SquareSize = 512;

        static void Main(string[] args)
        {
            var path = Directory.GetCurrentDirectory();
            var imagesDirectory = path + "\\images\\";
            if (!Directory.Exists(imagesDirectory))
                Directory.CreateDirectory(imagesDirectory);

            Console.WriteLine("Proccecing " + path);
            var directoryPaths = Directory.GetDirectories(path);
            for (int i = 0; i < directoryPaths.Length; i++)
            {
                var directoryPath = directoryPaths[i];
                string[] numbers = Regex.Split(directoryPath, @"\D+");
                if (numbers.Length == 4)
                {
                    var index = int.Parse(numbers[1]);
                    var width = int.Parse(numbers[2]);
                    var height = int.Parse(numbers[3]);
                    var imageName = imagesDirectory + index + ".Jpeg";
                    if (!File.Exists(imageName))
                    {
                        Console.WriteLine("Combining: " + directoryPath);
                        Combine(directoryPath, width, height, imageName);
                        Console.WriteLine("Done");
                    }
                    else
                        Console.WriteLine("Skipping: " + imageName);
                }
            }
            Console.WriteLine("All Done");
        }

        private static void Combine(string path,int width,int height,string outputFile)
        {
            using (Bitmap bmp = new Bitmap(width * SquareSize , height * SquareSize))
            {
                using (Graphics g = Graphics.FromImage(bmp))
                {
                    for (int y = 0; y < height; y++)
                    {
                        for (int x = 0; x < width; x++)
                        {
                            var index = x + y * width;
                            var indexImage = Image.FromFile(path+ "\\" + index + ".png");
                            g.DrawImage(indexImage, x * SquareSize, y * SquareSize, SquareSize, SquareSize);
                            indexImage.Dispose();
                        }
                    }
                }

                bmp.Save(outputFile, ImageFormat.Jpeg);
            }
        }
    }
}