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Great,

thank you I will try it.

Regards

I've got your point. That's a very nice workaround. I do this with any other pictures but did not expect it here.
But I still think there is something in the frame environment which holds back the basic features. Any other drawings work well. I did many slides with rectangles lines and more. But I ...

That's right, with class standalone everything works. But standalone does not support the beamer features.
The problem seems to be the frame-environment in the beamer class.

Hi,

I am just preparing a slide using beamer class. On this frame I want to draw a spider web.
I found a very useful example at http://www.texample.net/community/ . It works in beamer class as long as I do not put it into a frame. As long as the code is not surrounded by \begin{frame}...\end{frame ...