Curved label for curved feature line

[troma]

Has anyone managed to create a flow arrow label for a feature line that parallels the curve?

I've a vague notion that this could be done with a dynamic block and a few fancy expressions.  I'm comfortable with expressions, but I've never used dynamic blocks at all, so I wouldn't know where to start.

To be clear, I know curved text is possible, but I'm looking for a curved line (ie an arc) that would look 'parallel' to the arc of the feature line (ie have the same centre point).  This would have to be dynamic to allow for different radii and for flipping to the left and right side of the feature line.

Thanks for your input!

[BrianHailey]

I honestly can't think of anything. Dynamic blocks lose their dynamic ability within C3D label styles so I don't think that would work for you.

Perhaps something like this:

--------------->

Best I can come up with for now.

[troma]

Thanks Brian, didn't know that.  I did try something like that with the 'curved text' option, but it doesn't look great.  (The characters don't curve, just the gaps between them do.)