Need to have a simple flash movie that allows us to click a button (such as a simple toggle button) and using the mouse click a starting point and drag cursor to the ending point.
From there the line that is drawn should have a point in the middle that can be dragged around to make the curve.
Last but not least we need to be able to have a reference to all the points in the curved line, such as start point x,y cordinates, end point x,y cordinates, and middle point x,y cordinates. So that this curve can be redrawn by simple using actionscript.
I can explain further, but I think a good actionscripter should understand.