Image Resize with auto-crop

Task: Image resize, auto-crop and auto scale.

Description: Here is sample code for image resize with auto-crop while maintaining its ratio. below function we need to pass image path, maximum width and height for resizing. And then below code will resized to given width & height & crop the remaining part which not covered under given measurement. 

public void drawimage(string ThumbnailPath, int maxwidth, int maxheight)

    {

        System.Drawing.Image image = System.Drawing.Image.FromFile(ThumbnailPath);

       

        if (maxheight == 0 || maxwidth == 0)

        {

            maxwidth = image.Width;

            maxheight = image.Height;

        }

        Size ThumbNailSize = setimagesize(maxwidth, maxheight, image.Width, image.Height);

        System.Drawing.Image ImgThnail;

        if (image.Width < maxwidth || image.Height < maxheight)

        {

            ImgThnail = new Bitmap(ThumbNailSize.Width, ThumbNailSize.Height);

        }

        else

        {

            ImgThnail = new Bitmap(maxwidth, maxheight);

        }

       

        System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(ImgThnail);

        graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;

        graphics.SmoothingMode = SmoothingMode.HighQuality;

        graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;

        graphics.CompositingQuality = CompositingQuality.HighQuality;

        if (image.Width < maxwidth || image.Height < maxheight)

        {

            graphics.DrawImage(image, 0, 0, ThumbNailSize.Width, ThumbNailSize.Height);

        }

        else

        {

            int xcord = 0;

            int ycord = 0;

            {

                xcord = (ThumbNailSize.Width - maxwidth) / 2;

                ycord = (ThumbNailSize.Height - maxheight) / 2;

            }

            graphics.DrawImage(image, -xcord, -ycord, ThumbNailSize.Width, ThumbNailSize.Height);

        }

        ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();

        EncoderParameters encoderParameters;

        encoderParameters = new EncoderParameters(1);

        encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);

        string sExt = System.IO.Path.GetExtension(ThumbnailPath);

        if (sExt.ToString() == ".png")

        {

            Response.ContentType = "image/png";

            ImgThnail.Save(Response.OutputStream, image.RawFormat);

        }

        else

        {

            Response.ContentType = "image/jpeg";

            ImgThnail.Save(Response.OutputStream, info[1], encoderParameters);

        }

        image.Dispose();

    }

    // below code is my old one for calculating height and width with maintain image ratio.

public Size setimagesize(int maxwidth, int maxheight, int OriginalWidth, int OriginalHeight)

    {

        Size NewSize = new Size();

        if (OriginalHeight < maxheight && OriginalWidth < maxwidth)

        {

            NewSize = new Size(OriginalWidth, OriginalHeight);

            return NewSize;

        }

        int sNewWidth = OriginalWidth;

        int sNewHeight = OriginalHeight;

        int tempheight = 0;

        int tempwidht = 0;

        if (OriginalWidth >= OriginalHeight)

        {

            if (OriginalWidth >= maxwidth)

            {

                sNewWidth = maxwidth;

                sNewHeight = OriginalHeight * maxwidth / OriginalWidth;

            }

            if (sNewHeight < maxheight)

            {

                tempheight = sNewHeight;

                sNewHeight = maxheight;

                sNewWidth = sNewWidth * maxheight / tempheight;

            }

        }

        else

        {

            if (OriginalHeight >= maxheight)

            {

                sNewHeight = maxheight;

                sNewWidth = OriginalWidth * maxheight / OriginalHeight;

            }

            if (sNewWidth < maxwidth)

            {

                tempwidht = sNewWidth;

                sNewWidth = maxwidth;

                sNewHeight = sNewHeight * maxwidth / tempwidht;

            }

        }

        NewSize = new Size(sNewWidth, sNewHeight);

        return NewSize;

    }