graphic objects?

Sven Prevrhal Sven.Prevrhal at
Thu Aug 5 16:05:36 EDT 1999

What's the easiest way to diplay a graphic object in an image overlay -
let's say a circle or a rectanlge and then interactively move it around?

Can I use a vtkCanvasSource2D? It seems to block the underlying image -
maybe it has a transparency mode?

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