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mouse click with Mathematica 4.0

• To: mathgroup at smc.vnet.net
• Subject: [mg28641] mouse click with Mathematica 4.0
• From: bobbym1953 at aol.com
• Date: Thu, 3 May 2001 04:28:30 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

I would like to write a program with Mathematica, that draws tangents on 
graphic objects such as circles. I would like the program to be interactive. 
By clicking with the mouse on
a part of the circle, I would like the tangent to be drawn. I am not aware of 
a command that knows where the mouse is while the program is running. These 
features are a lot like Cabri Geometry, which allows things to be done while 
on the run. Any help would be appreciated.

Thanks,
Angela,
bobbym1953 at aol.com