Some Notes about Annotations in Medical Viewers

I have had a few questions come up recently regarding the use of annotation events in medical viewers. There are a few things to make note of when doing this.



First of all, the GetAnnotationContainer Method actually returns a Clone of the current AnnContainer object and is not valid for registering events. Though you could use this in conjunction with SetAnnotationContainer method and this would work. This is important for working with AfterDrawObjects and BeforeDrawObjects events of the AnnContainer object. In the attachment you can find the manner in which I register these events to the entire viewer.

Though this works there is a faster and easier way to doing so.

Something else that I feel needs to be mentioned is grabbing the selected annotation. You can find a snippet of how this is achieved in the attachment as well.

I believe this will help those of you working with more advanced annotation features with our medical viewers.