Use the tools observer: http://code.google.com/apis/sketchup/docs/ourdoc/toolsobserver.html and selection observer: http://code.google.com/apis/sketchup/docs/ourdoc/selectionobserver.html to gather the information of the user's interaction.

Thanks Jim, Web dialogues worked great! Thank you!

@anirudh said: jim, its a part of my research. i am trying to understand other gestures that could help sketchup in future. thats why. center could be 0,0 or arbitrary . I want to be able to draw using keyboard shortcuts. any ideas? learn ruby then. i don't know it but i'm pretty sure what you're trying to accomplish should be relatively easy to do.. that said, what you're trying to accomplish (at least the examples in the op) is very easy with sketchup itself but hey, i won't try to talk you out of your quest

dave its a part of my research. i am trying to understand other gesture that could help sketchup in future. thats why. center could be 0,0 or arbitrary

so do we get a way if we want to implement C++ TUIO client http://www.tuio.org/?software in a DLL loadable into SketchUp, any ideas ? cheers anirudh

I have a multitouch laptop coming in 2 weeks. Any chance this has come to fruition?

ahhh, sorry about that! I'm from the states - studied industrial design at a place called Art Center College of Design. I was looking at your blog and just realized you're in uni in rajasthan! anyway..sent you a pm.