[plt-scheme] canvas editor with text-editor snips?

 hi,   i am trying to rewrite a mind-mapping program (kdissert/semantik) in
drscheme and then make it more flexible.
    what the application will need is a canvas with a lot of boxes with text
in them and edges connecting the boxes. occasionally i will need an
text-editor snip, to create a new box of text or edit an existing one. and,
the boxes of text need to be draggable.
 MrEd, right now has two types of editors - text and pastebox, and both dont
seem to support drawing operations. I am writing to ask if anyone has
implemented a canvas editor so far. or maybe, there is some other way to
implement this functionality? i tried drawing a text-editor snip directly
onto the dc of a canvas using draw, but that didn't seem to work.
harsha.

   screenshots :
   http://freehackers.org/~tnagy/kdissert.html

http://www.esnips.com/doc/824f6991-2909-4592-8542-77761a04cedf/Screenshot-1
   (there is an option to view at original size)
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