#Dev-co Snippets

ID: 7001 - Final Image class
Posted by layonman98 on Thu Mar 11 14:13:56 UTC 2010. Language csharp

public class PhotoHelper
{

    internal static Image ResizeWithoutLosingProportion(Image img, int MaxWidth, int MaxHeight) 
    {
        Image nImg = null;
        if (img.Width > MaxWidth || img.Height > MaxHeight)
        {
            // Si la imágen NO es cuadrada
            if (img.Width != img.Height)
            {
                // Si la imágen es 'a lo alto'
                if (img.Width < img.Height)
                {
                    double nHeight = MaxHeight;
                    double percent = ((img.Height - nHeight) * 100 / img.Height) / 100;
                    double nWidth = img.Width - (img.Width * percent);
                    nImg = ResizeImg((Bitmap)img, (int)nWidth, (int)nHeight);
                }
                // Si la imágen es 'a lo ancho'
                else if (img.Width > img.Height)
                {
                    double nWidth = MaxWidth;
                    double percent = ((img.Width - nWidth) * 100 / img.Width) / 100;
                    double nHeight = img.Height - (img.Height * percent);
                    nImg = ResizeImg((Bitmap)img, (int)nWidth, (int)nHeight);
                }
            }
            // Si la imágen es cuadrada
            else if (img.Width == img.Height)
            {
                var nWidth = 604;
                var nHeight = 604;
                nImg = ResizeImg((Bitmap)img, nWidth, nHeight);
            }
        }
        else
        {
            nImg = img;
        }
        return nImg;
    }

    internal static Bitmap ResizeImg(Bitmap img, int nWidth, int nHeight)
    {
        var result = new Bitmap(nWidth, nHeight);
        using (Graphics g = Graphics.FromImage((Image)result))
        {
            g.DrawImage( img, 0, 0, nWidth, nHeight );
        }
        return result;
    }

    internal static void AddWaterMark( Image img, Image watermark, WatermarkLocation dest )
    {
        Graphics g = Graphics.FromImage((Image)img);
        Point point = new Point();
        switch (dest)
        {
            case WatermarkLocation.UpperLeft:
                point.X = 0;
                point.Y = 0;
                break;
            case WatermarkLocation.UpperRight:
                point.X = img.Width - watermark.Width;
                point.Y = 0;
                break;
            case WatermarkLocation.LowerLeft:
                point.X = 0;
                point.Y = img.Height - watermark.Height;
                break;
            case WatermarkLocation.LowerRight:
                point.X = img.Width - watermark.Width;
                point.Y = img.Height - watermark.Height;
                break;
            default:
                break;
        }
        g.DrawImage(watermark, point);
    }

    internal static ImageFormat GetImageFormat( string fileExtention ) 
    {
        ImageFormat imgFormat = null;
        
        if ( string.Equals( fileExtention, "jpeg" ) || string.Equals( fileExtention, "jpg" ) )
            imgFormat = ImageFormat.Jpeg;
        else if ( string.Equals( fileExtention, "png" ) )
            imgFormat = ImageFormat.Png;
        else if ( string.Equals( fileExtention, "gif" ) )
            imgFormat = ImageFormat.Gif;
        else if ( string.Equals( fileExtention, "bmp" ) )
            imgFormat = ImageFormat.Bmp;

        return imgFormat;
    }
}