A simple image sprite generator in C#

Last week I posted the source code to a small program I wrote in Java to merge images into a sprite. This week I present the same application but in C#, pretty much translated line by line 🙂

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;

namespace NSpriteGenerator
{
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length != 2)
            {
                Console.WriteLine("Usage: NSpriteGenerator {path to images} {output file}");
                return;
            }

            var imagePath = args[0];
            var outputFile = args[1];
            
            var imageFolder = new DirectoryInfo(imagePath);
            

            // Read images
            var imageList = imageFolder.GetFiles("*.png")
                    .Select(file => Image.FromFile(file.FullName));


            // Find max width and total height
            var maxWidth = 0;
            var totalHeight = 0;

            foreach(var image in imageList)
            {
                totalHeight += image.Height;

                if (image.Width > maxWidth)
                    maxWidth = image.Width;
            }

            Console.WriteLine(string.Format("Number of images: {0}, total height: {1}px, width: {2}", imageList.Count(), totalHeight, maxWidth));


            // Create the actual sprite
            var currentY = 0;

            using (var bitmap = new Bitmap(maxWidth, totalHeight))
            {
                using (var canvas = Graphics.FromImage(bitmap))
                {
                    foreach (var image in imageList)
                    {
                        canvas.DrawImage(image, 0, currentY);
                        currentY += image.Height;
                    }
                    canvas.Save();
                }

                Console.WriteLine("Writing sprite: "+ outputFile);
                bitmap.Save(outputFile, ImageFormat.Png);
            }
        }
    }
}

Output from a run:


PS C:\dev\NSpriteGenerator> .\NSpriteGenerator.exe C:\temp\gfx c:\temp\sprite.png
Number of images: 10, total height: 640px, width: 34
Writing sprite: c:\temp\sprite.png