Drawing over the top of an arbitrary web page would be possible, but limited. I don't think you could use a canvas (but I may be wrong), but you can always draw horizontal or vertical lines, and put arrow heads on them and lay other images over the top wherever you want.
Do you have a working demo of your swing tutorial lib?
On 28/09/11 16:09, ToonTalk@googlemail.com wrote:
> We have a Swing library (http://code.google.com/p/migen/source/browse/
> trunk/java/src/uk/ac/lkl/common/ui/jft/) that is useful for
> implementing interactive tutorials and programmatic interface
> interventions (e.g. 'intelligent' help). We are wondering if there is
> anything close that works for GWT Widgets. The kinds of actions we
> need include temporarily greying out and disabling most of the
> interface while highlighting the part of the interface we want to the
> user to focus on and use, drawing arrows, talk balloons, and thought
> bubbles to explain or reference Widgets, and the like.
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