Hi,

I'm trying to rotate an annotation in the web version.

I can do so when the annotation is created, but in a custom onclick event the WebAnnotationViewer.Annotations.Layers.Count always returns 1. Like I can't get a hold of any of the rubberstamp examples I'm using.

I wan to use somthing like:

WebAnnotationViewer.Annotations.Layers[i].Rotate(angle)

does anyone know how I can do this?

 

With the example you provided, it looks more like you are attempting to rotate the Layer.  Layers.Count is most likely returning 1 because there is only one layer.  If you are trying to get the number of annotations on one layer, you will need to look at WebAnnotationViewer1.Annotations.Layers[i].Items.Count.  To access individual annotation methods and properties, you will need to cast each item in the Items collection to the specific type of annotation you are looking for.  Something like this:

// untested code
AnnotationUI ann = WebAnnotationViewer1.Annotations.Layers[i].Items[j];

EllipseAnnotation ellipse = ann as EllipseAnnotation;
if (ellipse != null)
{
   ...
}

RectangleAnnotation rectangle = ann as RectangleAnnotation;
if (rectangle != null)
{
   ...
}

etc...

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David Cilley
My AJAX Imaging Blog
Atalasoft Development Team

Excellent.

 

Thanks very much David. I've just gone with

WebAnnotationViewer1.Annotations.Layers[0].Items[0].Rotate(angle);

And to make it apply the change I found I need to also call

WebAnnotationViewer1.UpdateAnnotations();

 

Cheers

Actually is there also a way to do the rotation clientside in real time?

I know we can resize real time but are rotations possible in the web forms version too?

 

No, this is not possible in the current version.

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David Cilley
My AJAX Imaging Blog
Atalasoft Development Team

This code works well, but I'm wondering if what I need to do is different.

I can get the annotations to rotate, but they rotate on their own axis and not relative to the images axis. In other words, we're not burning annotations, so when we rotate annotations, the annotations need to rotate properly from the perspective of the images layer and not the annotations own layer.

Is this possible and, is there an easy way to accomplish this? Thanks...

You are correct, rotating an annotation will only rotate the annotation.  It does not reposition it.  You will have to calculate and set the new position of the annotation, based on the rotation of the image.

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David Cilley
My AJAX Imaging Blog
Atalasoft Development Team