How do you animate line drawings? On the fly.

I know there are many tutorials on paths and animating on paths. However my application is a bit different.
I have a embedded hardware device that we created that, when feed certain input it will output Cartesian coordinates. Since these coords are computed while the device is receiving input there is not way I can "pre compute" a path to animate on.
What I am trying to do is have each line "grow" or "animate" to its new endpoint vs just a jerky instantly drawn line to its new endpoint. Perhaps a better word for this is a gradual "transition". I have the "velocity" of the line being drawn too btw.
You can see a video here of the "jerky" verison:
http://www.flickr.com/photos/rileyporter/6852883154/in/photostream
Please let me know if this question makes any sense.
Riley

The API documentation itself has some sample code. And it has links to a tutorial:
http://java.sun.com/docs/books/tutorial/uiswing/components/list.html
and an advanced article:
http://java.sun.com/products/jfc/tsc/tech_topics/jlist_1/jlist.html
both of which have sample code.

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Rock,
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How do you animate line drawings? On the fly.

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