C# Imaging.CroppedBitmap类代码示例

      public void PageLoaded(object sender, RoutedEventArgs args)
      {
         // Create an Image element.
         Image croppedImage = new Image();
         croppedImage.Width = 200;
         croppedImage.Margin = new Thickness(5);

         // Create a CroppedBitmap based off of a xaml defined resource.
         CroppedBitmap cb = new CroppedBitmap(     
            (BitmapSource)this.Resources["masterImage"],
            new Int32Rect(30, 20, 105, 50));       //select region rect
         croppedImage.Source = cb;                 //set image source to cropped

         // Add Image to the UI
         Grid.SetColumn(croppedImage, 1);
         Grid.SetRow(croppedImage, 1);
         croppedGrid.Children.Add(croppedImage);

         // Create an Image element.
         Image chainImage = new Image();
         chainImage.Width = 200;
         chainImage.Margin = new Thickness(5);

         // Create the cropped image based on previous CroppedBitmap.
         CroppedBitmap chained = new CroppedBitmap(cb,
            new Int32Rect(30, 0, (int)cb.Width-30, (int)cb.Height)); 
         // Set the image's source.
         chainImage.Source = chained;

         // Add Image to the UI.
         Grid.SetColumn(chainImage, 1);
         Grid.SetRow(chainImage, 3);
         croppedGrid.Children.Add(chainImage);

      }

 public Pieza(int valor, int fila, int columna, CroppedBitmap imagen)
 {
     Valor = valor;
     Fila = fila;
     Columna = columna;
     Imagen = imagen;
 }

        /// <summary>
        /// Generates an image of each page in the year book
        /// and saves it to the src folder
        /// </summary>
        /// <param name="bv"></param>
        /// <param name="folderloc"></param>
        private static void RenderPages(BookViewer bv, string folderloc)
        {
            int currentpage = bv.ViewIndex;
            //loops though each page
            foreach (Page p in bv.CurrentBook.Pages)
            {
                bv.ViewIndex = p.PageNumber;
                //forces the canvas to re-render
                BookViewer.DesignerCanvas.UpdateLayout();
                //takes a picture of the canvas
                RenderTargetBitmap rtb = new RenderTargetBitmap(PaperSize.Pixel.PaperWidth, PaperSize.Pixel.PaperHeight, 96, 96, PixelFormats.Default);
                rtb.Render(BookViewer.DesignerCanvas);
                //getting the bleed margin
                Int32Rect bleedmargin = new Int32Rect((PaperSize.Pixel.PaperWidth - PaperSize.Pixel.BleedWidth) / 2, (PaperSize.Pixel.PaperHeight - PaperSize.Pixel.BleedHeight) / 2, PaperSize.Pixel.BleedWidth, PaperSize.Pixel.BleedHeight);
                //cropping the image
                CroppedBitmap cb = new CroppedBitmap(rtb, bleedmargin);
                //encodes the image in png format
                PngBitmapEncoder pbe = new PngBitmapEncoder();
                pbe.Frames.Add(BitmapFrame.Create(cb));
                //saves the resulting image
                FileStream fs = File.Open(folderloc + "\\src\\" + (p.PageNumber+1) + ".png", FileMode.Create);
                pbe.Save(fs);
                fs.Flush();
                fs.Close();

            }
            bv.ViewIndex = currentpage;
        }

        private Color GetColorFromImage(Point p)
        {
            try
            {
                var bounds = VisualTreeHelper.GetDescendantBounds(this);
                var rtb = new RenderTargetBitmap((int) bounds.Width, (int) bounds.Height, 96, 96, PixelFormats.Default);
                rtb.Render(this);

                byte[] arr;
                var png = new PngBitmapEncoder();
                png.Frames.Add(BitmapFrame.Create(rtb));
                using (var stream = new MemoryStream())
                {
                    png.Save(stream);
                    arr = stream.ToArray();
                }

                BitmapSource bitmap = BitmapFrame.Create(new MemoryStream(arr));

                var pixels = new byte[4];
                var cb = new CroppedBitmap(bitmap, new Int32Rect((int) p.X, (int) p.Y, 1, 1));
                cb.CopyPixels(pixels, 4, 0);
                return Color.FromArgb(pixels[3], pixels[2], pixels[1], pixels[0]);
            }
            catch (Exception)
            {
                return ColorBox.Color;
            }
        }

        /// <summary>Creates the screenshot of entire plotter element</summary>
        /// <returns></returns>
        internal static BitmapSource CreateScreenshot(UIElement uiElement, Int32Rect screenshotSource)
        {
            Window window = Window.GetWindow(uiElement);
            if (window == null)
            {
                return CreateElementScreenshot(uiElement);
            }
            Size size = window.RenderSize;

            //double dpiCoeff = 32 / SystemParameters.CursorWidth;
            //int dpi = (int)(dpiCoeff * 96);
            double dpiCoeff = 1;
            int dpi = 96;

            RenderTargetBitmap bmp = new RenderTargetBitmap(
                (int)(size.Width * dpiCoeff), (int)(size.Height * dpiCoeff),
                dpi, dpi, PixelFormats.Default);

			// white background
			Rectangle whiteRect = new Rectangle { Width = size.Width, Height = size.Height, Fill = Brushes.White };
			whiteRect.Measure(size);
			whiteRect.Arrange(new Rect(size));
			bmp.Render(whiteRect);
			// the very element
            bmp.Render(uiElement);

            CroppedBitmap croppedBmp = new CroppedBitmap(bmp, screenshotSource);
            return croppedBmp;
        }

        private void Image_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
        {
            var AssociatedObject = this;
            // Retrieve the coordinate of the mouse position in relation to the supplied image.
            Point point = e.GetPosition(AssociatedObject);

            // Use RenderTargetBitmap to get the visual, in case the image has been transformed.
            var renderTargetBitmap = new RenderTargetBitmap((int) AssociatedObject.ActualWidth,
                (int) AssociatedObject.ActualHeight,
                96, 96, PixelFormats.Default);
            renderTargetBitmap.Render(AssociatedObject);

            // Make sure that the point is within the dimensions of the image.
            if ((point.X <= renderTargetBitmap.PixelWidth) && (point.Y <= renderTargetBitmap.PixelHeight))
            {
                // Create a cropped image at the supplied point coordinates.
                var croppedBitmap = new CroppedBitmap(renderTargetBitmap,
                    new Int32Rect((int) point.X, (int) point.Y, 1, 1));

                // Copy the sampled pixel to a byte array.
                var pixels = new byte[4];
                croppedBitmap.CopyPixels(pixels, 4, 0);

                // Assign the sampled color to a SolidColorBrush and return as conversion.
                var SelectedColor = Color.FromArgb(255, pixels[2], pixels[1], pixels[0]);
                TextBox.Text = "#" + SelectedColor.ToString().Substring(3);
                Label.Background = new SolidColorBrush(SelectedColor);
            }
        }

        private void Image_MouseDown(object sender, MouseButtonEventArgs e)
        {
            try
            {
                var cb = new CroppedBitmap((BitmapSource) (((Image) e.Source).Source),
                                           new Int32Rect((int) Mouse.GetPosition(e.Source as Image).X,
                                                         (int) Mouse.GetPosition(e.Source as Image).Y, 1, 1));
                _pixels = new byte[4];
                try
                {
                    cb.CopyPixels(_pixels, 4, 0);
                    SetColor(Color.FromRgb(_pixels[2], _pixels[1], _pixels[0]));
                    UpdateMarkerPosition();

                    if (OnColorSelected != null)
                        OnColorSelected(SelectedColor);
                }
                catch
                {
                    // not logged
                }
                UpdateSlider();
            }
            catch (Exception)
            {
                // not logged
            }
        }

 private Color GetColorFromImage()
 {
     var color = Colors.Transparent;
     try
     {
         BitmapSource bitmapSource = ImageColors.Source as BitmapSource;
         if (bitmapSource != null)
         {
             double x = Mouse.GetPosition(ImageColors).X;
             x *= bitmapSource.PixelWidth / ImageColors.ActualWidth;
             if ((int)x > bitmapSource.PixelWidth - 1)
                 x = bitmapSource.PixelWidth - 1;
             else if (x < 0) x = 0;
             double y = Mouse.GetPosition(ImageColors).Y;
             y *= bitmapSource.PixelHeight / ImageColors.ActualHeight;
             if ((int)y > bitmapSource.PixelHeight - 1)
                 y = bitmapSource.PixelHeight - 1;
             else if (y < 0) y = 0;
             CroppedBitmap cb = new CroppedBitmap(bitmapSource, new Int32Rect((int)x, (int)y, 1, 1));
             byte[] pixels = new byte[4];
             cb.CopyPixels(pixels, 4, 0);
             if (pixels[3] == byte.MaxValue)
             {
                 color = Color.FromArgb(pixels[3], pixels[2], pixels[1], pixels[0]);
             }
         }
     }
     catch (Exception ex)
     {
         Log.Add(ex);
     }
     return color;
 }

        public CardPack()
        {
            _pack = new List<Card>();
            Uri uri = new Uri("./Images/cards.png", UriKind.Relative);
            source = new BitmapImage(uri);
            _cardFronts = new List<CroppedBitmap>();
            CardBack = new Image();

            int w = source.PixelWidth / 13;
            int h = source.PixelHeight/5;

            for (int s = 0; s < 4; s++)
            {
                for (int v = 0; v < 13; v++)
                {
                    int imageIndex = (s*13) + v;

                    int fx = imageIndex % 13;
                    int fy = imageIndex / 13;

                    Int32Rect sourceRect = new Int32Rect(fx * w, fy * h, w, h);
                    CroppedBitmap front = new CroppedBitmap(source, sourceRect);

                    sourceRect = new Int32Rect(2 * w, 4 * h, w, h);
                    CroppedBitmap back = new CroppedBitmap(source, sourceRect);

                    Image frontImage = new Image {Source = front};
                    Image backImage = new Image { Source = back };

                    Card card = new Card((CardSuit)s, (CardValue)v, frontImage, backImage);
                    _pack.Add(card);
                }
            }
        }

 public void DrawImage(BasicRectangle rectangleDestination, BasicRectangle rectangleSource, IDisposable image)
 {
     // Make sure the source rectangle width isn't out of bounds
     var disposableImage = (DisposableBitmap)image;
     var croppedBitmap = new CroppedBitmap(disposableImage.Bitmap, GenericControlHelper.ToInt32Rect(rectangleSource));
     _context.DrawImage(croppedBitmap, GenericControlHelper.ToRect(rectangleDestination));
 }

 private static ImageSource GetImageSource()
 {
     BitmapSource source = ImageHelper.BitmapSourceFromBitmap(new Bitmap(Image.FromStream(Assembly.GetExecutingAssembly().GetManifestResourceStream("Paket.VisualStudio.Resources.NuGet.ico"))));
     Int32Rect sourceRect = new Int32Rect(0, 0, 16, 16);
     ImageSource imageSource = new CroppedBitmap(source, sourceRect);
     imageSource.Freeze();
     return imageSource;
 }

        public Image MakeImage()
        {
            CroppedBitmap subImg = new CroppedBitmap(RootImage, Region);

            Image res = new Image();
            res.Source = subImg;

            return res;
        }

 public CroppedBitmap GetBitMap(int id)
 {
     var p = GetPosition(id);
     var bitmap = new CroppedBitmap();
     bitmap.BeginInit();
     bitmap.Source = _imageSource;
     bitmap.SourceRect = new Int32Rect(p.X * _cropSize, p.Y * _cropSize, _cropSize, _cropSize);
     bitmap.EndInit();
     return bitmap;
 }

        public Task<BitmapSource> TakePartialScreenshot(Int32Rect rpRect)
        {
            return TakeScreenshot(r =>
            {
                var rResult = new CroppedBitmap(r, rpRect);
                rResult.Freeze();

                return rResult;
            });
        }

        public ShowMyFace()
        {
            Title = "Show My Face";

            ///******************************************************************
            //  3���� ShowMyFace ����
            //******************************************************************/
            Uri uri = new Uri("http://www.charlespetzold.com/PetzoldTattoo.jpg");
            //BitmapImage bitmap = new BitmapImage(uri);
            //Image img = new Image();
            //img.Source = bitmap;
            //Content = img;

            ///******************************************************************
            //  p1245 BitmapImage �ڵ�
            //******************************************************************/
            Image rotated90 = new Image();
            TransformedBitmap tb = new TransformedBitmap();
            FormatConvertedBitmap fb = new FormatConvertedBitmap();
            CroppedBitmap cb = new CroppedBitmap();

            // Create the source to use as the tb source.
            BitmapImage bi = new BitmapImage();
            bi.BeginInit();
            bi.UriSource = uri;
            bi.EndInit();

            //cb.BeginInit();
            //cb.Source = bi;
            //Int32Rect rect = new Int32Rect();
            //rect.X = 220;
            //rect.Y = 200;
            //rect.Width = 120;
            //rect.Height = 80;
            //cb.SourceRect = rect;

            //cb.EndInit();

            fb.BeginInit();
            fb.Source = bi;
            fb.DestinationFormat = PixelFormats.Gray2;
            fb.EndInit();

            // Properties must be set between BeginInit and EndInit calls.
            tb.BeginInit();
            tb.Source = fb;
            // Set image rotation.
            tb.Transform = new RotateTransform(90);
            tb.EndInit();
            // Set the Image source.
            rotated90.Source = tb;
            Content = rotated90;
        }