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HOWTO: Burn annotations with the WebAnnotationViewer


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This article references our legacy Web Forms Web Viewing controls (WebImageViewer, WebAnnotationViewer, WebThumbnailViewer). It is preserved for archival purposes, but support strongly recommends using our modern HTML5 web controls: WebDocumentViewer, WebDocumentThumbnailer instead)

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This code sample shows how you can burn all of the annotations contained in the WebAnnotationViewer's LayerCollection onto an AtalaImage.


AtalaImage img = BurnAnnotations(this.WebAnnotationViewer1.Annotations.Layers, this.WebAnnotationViewer1.Image);

// Burns the given LayerCollection onto the given image if possible
// otherwise, burns the LayerCollection onto a copy of the given image
private AtalaImage BurnAnnotations(LayerCollection layers, AtalaImage image)
   AtalaImage burn = image;

   if (burn != null)
      // Can't render annotations on indexed PixelFormats
      if (burn.PixelFormat != PixelFormat.Pixel24bppBgr && burn.PixelFormat != PixelFormat.Pixel32bppBgra)
         ChangePixelFormatCommand cmd = new ChangePixelFormatCommand(PixelFormat.Pixel32bppBgra);
         burn = cmd.Apply(image).Image;

      RenderEnvironment re = new RenderEnvironment(RenderDevice.Display, burn.GetGraphics(), new PointF(1, 1), AnnotationUnit.Pixel, null, new PointF((float)image.Resolution.X, (float)image.Resolution.Y));

      foreach (LayerAnnotation layer in layers)
         foreach (AnnotationUI ann in layer.Items)
            IAnnotationRenderer renderer = AnnotationRenderers.Get(ann.Data.GetType());
            renderer.RenderAnnotation(ann.Data, re);

   return burn;

Original Article:
Q10164 - HOWTO: Burning annotations with the WebAnnotationViewer

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