I'm wondering how difficult it would be to add a
> speedometer-like 'dial' plot type. ( apparently this
> appeals to executive types ) I imagine it would take a
> range and a scalar value which would be the location of
> the 'needle'. Any pointers to how to craft such a thing
> would be appreciated.
I think you could reuse most of the PolarAxes code for this, but
instead of using a polar transform place a line or line/arrow in the
center pointing to the "speed"