[IGSTK-Developers] Annotation2D class

[Patrick Cheng]

Hi Andinet,

I need to use the Annotation2D class to display some dynamic message. It 
seems like current implementation doesn't allow user to change the 
diaplayed texts on the fly.

I want to be able to:

1. Change the text content at realtime, like the realtime update of the 
cursor position in itkImageViewer

2. Change the text properties, size, color, and font

3. There is issue with resize the window, the view port position of the 
text actor should be updated accordingly.

Thank you,

Patrick