C# Imaging.PngBitmapEncoder类代码示例

        private void ButtonSave_Click(object sender, RoutedEventArgs e)
        {
            var rect = new Rect { Width = 512, Height = 384 };
            var dv = new DrawingVisual();

            var dc = dv.RenderOpen();
            dc.PushTransform(new TranslateTransform(-rect.X, -rect.Y));
            dc.DrawRectangle(InkCanvasMain.Background, null, rect);
            InkCanvasMain.Strokes.Draw(dc);
            dc.Close();

            var rtb = new RenderTargetBitmap((int)rect.Width, (int)rect.Height, 96, 96, PixelFormats.Default);
            rtb.Render(dv);
            var enc = new PngBitmapEncoder();
            enc.Frames.Add(BitmapFrame.Create(rtb));

            var fn = TextBoxFileName.Text;
            if (!fn.EndsWith(".png", StringComparison.OrdinalIgnoreCase)) fn += ".png";
            using (Stream s = File.Create(TegakiImageFolder + "/" + fn))
            {
                enc.Save(s);
            }
            ((TegakiWindowViewModel)DataContext).AddToMediaList(System.IO.Path.GetFullPath(TegakiImageFolder + "/" + fn));
            Close();
        }

        private void Create3DViewPort()
        {
            var hvp3d = new HelixViewport3D();
            Viewport3D vp3d = new Viewport3D();
            var lights = new DefaultLights();
            var tp = new Teapot();

            hvp3d.Children.Add(lights);
            hvp3d.Children.Add(tp);

            vp3d = hvp3d.Viewport;
            tata.Children.Add(vp3d); // comenter ca pour test

            /* MEGA TEST DE L'ESPACE SUBSAHARIEN */

            RenderTargetBitmap bmp = new RenderTargetBitmap(800, 800, 96, 96, PixelFormats.Pbgra32);
            var rect = new Rect(0, 0, 800, 800);
            vp3d.Measure(new Size(800, 800));
            vp3d.Arrange(rect);
            vp3d.InvalidateVisual();
            
            bmp.Render(vp3d);

            PngBitmapEncoder png = new PngBitmapEncoder();
            png.Frames.Add(BitmapFrame.Create(bmp));

            String filepath = "C:\\Users\\Remi\\Desktop\\canardmasque.png";
            using (Stream stm = File.Create(filepath))
            {
                png.Save(stm);
            }
        }

        /// <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;
        }

        public static byte[] Encode(String path)
        {
            byte[] encoded;
            try
            {
                BitmapImage bitmap = new BitmapImage();
                bitmap.BeginInit();
                bitmap.CacheOption = BitmapCacheOption.OnLoad;
                bitmap.UriSource = new Uri(path, UriKind.RelativeOrAbsolute);
                bitmap.EndInit();

                BitmapEncoder encoder = new PngBitmapEncoder();
                encoder.Frames.Add(BitmapFrame.Create(bitmap));

                using (var stream = new MemoryStream())
                {
                    encoder.Save(stream);
                    encoded = stream.ToArray();
                }

                return encoded;
            }
            catch (Exception)
            {
                return null;
            }
        }

    public static Cursor CreateCursor(UIElement element, int xHotSpot, 
        int yHotSpot)
    {
      element.Measure(new Size(double.PositiveInfinity, 
        double.PositiveInfinity));
      element.Arrange(new Rect(0, 0, element.DesiredSize.Width, 
        element.DesiredSize.Height));

      RenderTargetBitmap rtb = 
        new RenderTargetBitmap((int)element.DesiredSize.Width, 
          (int)element.DesiredSize.Height, 96, 96, PixelFormats.Pbgra32);
      rtb.Render(element);

      PngBitmapEncoder encoder = new PngBitmapEncoder();
      encoder.Frames.Add(BitmapFrame.Create(rtb));

      MemoryStream ms = new MemoryStream();
      encoder.Save(ms);

      System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(ms);

      ms.Close();
      ms.Dispose();     

      Cursor cur = InternalCreateCursor(bmp, xHotSpot, yHotSpot);

      bmp.Dispose();

      return cur;
    }

        private void SavePatient()
        {
            // string paths = @"c:\amHealth\images";
            string filePath = @"c:\amHealth\\images\" +fname.Text+"-"+lname.Text +".jpg";
            var encoder = new PngBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create((BitmapSource)imgCapture.Source));

            using (FileStream stream = new FileStream(filePath, FileMode.Create))
                encoder.Save(stream);

            _patient = App.amApp.Patients.Add();
            _patient.Lname = lname.Text;
            _patient.Fname = fname.Text;
            _patient.Gender = gender.Text;
            _patient.Dob = dob.Text;
            _patient.Height = height.Text;
            _patient.Weight = weight.Text;
            _patient.Phone = phone.Text;
            _patient.Region = region.Text;
            _patient.Sync = "F";
            _patient.Email = email.Text;
            _patient.Org = "test";
            _patient.Image = fname.Text + "-" + lname.Text + ".jpg";


            _patient.Save();
            System.Windows.MessageBox.Show("Patient saved ");
            this.DialogResult = true;

        }

        public void Convert(IEnumerable<IAssetImageSource> sources, string target, VisualAssetInfo visualAsset)
        {
            if (sources == null)
            {
                throw new ArgumentNullException("sources");
            }
            if (string.IsNullOrEmpty(target))
            {
                throw new ArgumentNullException("target");
            }
            if (visualAsset == null)
            {
                throw new ArgumentNullException("visualAsset");
            }

            var rectangle = this.GetRectangleBounds(visualAsset.Width, visualAsset.Height, visualAsset.Margin);
            var drawingVisual = this.CreateDrawingVisual(sources, rectangle);

            var targetBitmap = new RenderTargetBitmap(visualAsset.Width, visualAsset.Height, 96, 96, PixelFormats.Pbgra32);
            targetBitmap.Render(drawingVisual);

            var png = new PngBitmapEncoder();
            png.Frames.Add(BitmapFrame.Create(targetBitmap));

            using (var stream = new FileStream(target, FileMode.Create, FileAccess.Write))
            {
                png.Save(stream);
            }
        }

        /// <summary>
        /// Handles the user clicking on the screenshot button
        /// </summary>
        /// <param name="sender">object sending the event</param>
        /// <param name="e">event arguments</param>
        private void ButtonScreenshotClick(object sender, RoutedEventArgs e)
        {
            if (null == this.sensor)
            {
                this.statusBarText.Text = Properties.Resources.ConnectDeviceFirst;
                return;
            }

            // create a png bitmap encoder which knows how to save a .png file
            BitmapEncoder encoder = new PngBitmapEncoder();

            // create frame from the writable bitmap and add to encoder
            encoder.Frames.Add(BitmapFrame.Create(this.colorBitmap));

            string time = System.DateTime.Now.ToString("hh'-'mm'-'ss", CultureInfo.CurrentUICulture.DateTimeFormat);

            string myPhotos = Environment.GetFolderPath(Environment.SpecialFolder.MyPictures);

            string path = Path.Combine(myPhotos, "KinectSnapshot-" + time + ".png");

            // write the new file to disk
            try
            {
                using (FileStream fs = new FileStream(path, FileMode.Create))
                {
                    encoder.Save(fs);
                }

                this.statusBarText.Text = string.Format(CultureInfo.InvariantCulture, "{0} {1}", Properties.Resources.ScreenshotWriteSuccess, path);
            }
            catch (IOException)
            {
                this.statusBarText.Text = string.Format(CultureInfo.InvariantCulture, "{0} {1}", Properties.Resources.ScreenshotWriteFailed, path);
            }
        }

        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;
            }
        }

        public static byte[] ExportToPng(this FrameworkElement surface)
        {
            var transform = surface.LayoutTransform;
            surface.LayoutTransform = null;

            var size = new Size(surface.ActualWidth, surface.ActualHeight);
            surface.Measure(size);
            surface.Arrange(new Rect(size));

            var renderBitmap = new RenderTargetBitmap((int)size.Width, (int)size.Height, 96d, 96d, PixelFormats.Pbgra32);
            renderBitmap.Render(surface);

            try
            {
                using (var outStream = new MemoryStream())
                {
                    var encoder = new PngBitmapEncoder();
                    encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
                    encoder.Save(outStream);
                    return outStream.ToArray();
                }
            }
            finally 
            {
                surface.LayoutTransform = transform;
            }
        }

        /// <summary>
        /// Convert any control to a PngBitmapEncoder
        /// </summary>
        /// <param name="controlToConvert">The control to convert to an ImageSource</param>
        /// <returns>The returned ImageSource of the controlToConvert</returns>
        private static PngBitmapEncoder getImageFromControl(Control controlToConvert)
        {
            // save current canvas transform
            Transform transform = controlToConvert.LayoutTransform;

            // get size of control
            Size sizeOfControl = new Size(controlToConvert.ActualWidth, controlToConvert.ActualHeight);
            // measure and arrange the control
            controlToConvert.Measure(sizeOfControl);
            // arrange the surface
            controlToConvert.Arrange(new Rect(sizeOfControl));

            // craete and render surface and push bitmap to it
            RenderTargetBitmap renderBitmap = new RenderTargetBitmap((Int32)sizeOfControl.Width, (Int32)sizeOfControl.Height, 96d, 96d, PixelFormats.Pbgra32);
            // now render surface to bitmap
            renderBitmap.Render(controlToConvert);
            
            // encode png data
            PngBitmapEncoder pngEncoder = new PngBitmapEncoder();
            // puch rendered bitmap into it
            pngEncoder.Frames.Add(BitmapFrame.Create(renderBitmap));

            // return encoder
            return pngEncoder;
        }

 public static void SaveAsPng(this BitmapSource bitmap, string filename) {
     var encoder = new PngBitmapEncoder();
     encoder.Frames.Add(BitmapFrame.Create(bitmap));
     using (var s = File.Create(filename)) {
         encoder.Save(s);
     }
 }

		private void SaveImage(string filePath)
		{
			var encoder = new PngBitmapEncoder();
			encoder.Frames.Add(BitmapFrame.Create((BitmapSource) imageScreenshot.Source));
			using (var stream = new FileStream(filePath, FileMode.Create))
				encoder.Save(stream);
		}

        /// <summary>
        /// Gets a PNG "screenshot" of the current UIElement
        /// </summary>
        /// <param name="source">UIElement to screenshot</param>
        /// <param name="scale">Scale to render the screenshot</param>
        /// <returns>Byte array of PNG data</returns>
        public static byte[] GetPngImage(this UIElement source, double scale = 1)
        {
            var actualHeight = source.RenderSize.Height;
            var actualWidth = source.RenderSize.Width;

            var renderHeight = actualHeight * scale;
            var renderWidth = actualWidth * scale;

            var renderTarget = new RenderTargetBitmap((int)renderWidth, (int)renderHeight, 96, 96, PixelFormats.Pbgra32);
            var sourceBrush = new VisualBrush(source);

            var drawingVisual = new DrawingVisual();
            var drawingContext = drawingVisual.RenderOpen();

            using (drawingContext)
            {
                drawingContext.PushTransform(new ScaleTransform(scale, scale));
                drawingContext.DrawRectangle(sourceBrush, null, new Rect(new Point(0, 0), new Size(actualWidth, actualHeight)));
            }
            renderTarget.Render(drawingVisual);

            var pngEncoder = new PngBitmapEncoder();
            pngEncoder.Frames.Add(BitmapFrame.Create(renderTarget));
            Byte[] imageArray;

            using (var outputStream = new MemoryStream())
            {
                pngEncoder.Save(outputStream);
                imageArray = outputStream.ToArray();
            }

            return imageArray;
        }

        public void SaveToPng( Canvas surface, string file )
        {
            // Save current canvas transform
            var transform = surface.LayoutTransform;
            // reset current transform (in case it is scaled or rotated)
            surface.LayoutTransform = null;

            var size = new Size( 1600, 900 );

            // Attentation: Measure and arrange the surface !
            surface.Measure( size );
            surface.Arrange( new Rect( size ) );

            var renderBitmap = new RenderTargetBitmap( (int)size.Width, (int)size.Height, 96d, 96d, PixelFormats.Pbgra32 );

            var bounds = VisualTreeHelper.GetDescendantBounds( surface );
            var dv = new DrawingVisual();
            using ( var ctx = dv.RenderOpen() )
            {
                var vb = new VisualBrush( surface );
                ctx.DrawRectangle( vb, null, new Rect( new Point(), bounds.Size ) );
            }

            renderBitmap.Render( dv );
            using ( var outStream = new FileStream( file, FileMode.OpenOrCreate, FileAccess.Write ) )
            {
                var encoder = new PngBitmapEncoder();
                encoder.Frames.Add( BitmapFrame.Create( renderBitmap ) );
                encoder.Save( outStream );
            }

            // Restore previously saved layout
            surface.LayoutTransform = transform;
        }