Add distance annotation

Distance annotation measures a distance between objects in a document like shown at the picture below. 

There is an ability to specify the next properties for DistanceAnnotation type:

  • Box - defines annotation position at document page;
  • Opacity - allows to set annotation opacity;
  • PenColor - defines annotation color;
  • PenStyle - defines annotation line style (solid, dash, dot etc.);
  • PenWidth - defines line width in pixels.

Follow these steps to add Distance annotation to document:  

  • Instantiate Annotator object with input document path or stream;
  • Instantiate DistanceAnnotation object with desired properties (position, page number, etc);
  • Call Add method and pass DistanceAnnotation object;
  • Call Save method with resultant document path or stream.

The following code demonstrates how to add DistanceAnnotation to the document:

//Add distance annotation to the document from local disk
using (Annotator annotator = new Annotator("input.pdf"))
	DistanceAnnotation distance = new DistanceAnnotation
        Box = new Rectangle(200, 150, 200, 30),
        CreatedOn = DateTime.Now,
        Message = "This is distance annotation",
        Opacity = 0.7,
        PageNumber = 0,
        PenColor = 65535,
        PenStyle = PenStyle.Dot,
        PenWidth = 3,
        Replies = new List<Reply>
        	new Reply
            	Comment = "First comment",
                RepliedOn = DateTime.Now
            new Reply
            	Comment = "Second comment",
                RepliedOn = DateTime.Now

More resources

Advanced Usage Topics

To learn more about document annotating features, please refer to the advanced usage section.

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

Free Online App

Along with full-featured .NET library we provide simple but powerful free Apps. You are welcome to annotate your PDF, DOC or DOCX, XLS or XLSX, PPT or PPTX, PNG and other documents with free to use online GroupDocs Annotation App.