imageprocessor.cs

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using System;
using System.Drawing;

namespace Addot.Drawing
{
    /// <summary>
    /// Implementation of some image processing.
    /// Please, refer to the .Net framework for the complete documentation.
    /// </summary>
    public class ImageProcessor
	{
        public static Bitmap RotateFlip(Bitmap source, RotateFlipType change)
        {
            Bitmap dest = new Bitmap(source.Size.Height, source.Size.Width);
            int MaxWidthIndex = source.Size.Width - 1;
            int MaxHeightIndex = source.Size.Height - 1;

            for(int X = 0; X < source.Size.Width; X++)
            {
                for(int Y = 0; Y < source.Size.Height; Y++)
                {
                    switch(change)
                    {
                        case RotateFlipType.Rotate270FlipNone:
                            dest.SetPixel(Y, MaxWidthIndex - X, source.GetPixel(X, Y));
                            break;
                        case RotateFlipType.Rotate90FlipNone:
                            dest.SetPixel(MaxHeightIndex - Y, X, source.GetPixel(X, Y));
                            break;
                    }
                }
            }

            return dest;
        }

        public static Bitmap GetThumbnailImage(Bitmap sourceImg, int width, int height, bool drawRectangle, bool stretchLittle)
        {
            //
            // Create the thumb
            //
            Bitmap thumb = new Bitmap(width, height);
            Graphics toBeDrawn = Graphics.FromImage(thumb);

            //
            // Fill the thumb with WHITE
            //
            SolidBrush white = new SolidBrush(Color.White);
            toBeDrawn.FillRectangle(white, 0, 0, thumb.Width, thumb.Height);

            //
            // Resize the sourceImg
            //
            Size newImageSize = new Size(sourceImg.Size.Width, sourceImg.Size.Height);
            Point location = new Point(0, 0);

            // If the original image is not bigger than the thumb,
            // it is displayed as this, just center in its container.
            if( !stretchLittle && (sourceImg.Width < width) && (sourceImg.Height < height) )
            {
                location = SizeProcessor.CenterToContainer(new Size(width, height), newImageSize);
            }
            else
            {
                SizeProcessor.FitToContainer(thumb.Size, ref newImageSize, ref location);
            }

            //
            // Draw the image
            //
            Rectangle source = new Rectangle(0, 0, sourceImg.Width, sourceImg.Height);
            Rectangle dest = new Rectangle(location.X, location.Y, newImageSize.Width, newImageSize.Height);
            toBeDrawn.DrawImage(sourceImg, dest, source, GraphicsUnit.Pixel);

            //
            // Draw the thumbnail rectangle
            //
            if( drawRectangle )
            {
                Pen pen = new Pen(Color.Black);
                toBeDrawn.DrawRectangle(pen, 0, 0, width - 1, height - 1);
            }

            return thumb;
        }
    }
}