feature line direction arrow label

[CLG1972]

Is there a way to direction arrow point to the lowest point dynamically. I have labels on my feature line which update automatically, however the direction arrows are all the same direction.

[troma · Accepted solution]

You need an expression.

Something like this:

Give it a good name like "direction of flow"

Then in your label style composer, for the rotation of the arrow choose "direction of flow".

BTW I use a Block for my flow arrow, not the "Direction Arrow" option within the label. I can't remember if it's possible to rotate that one or not.

[Maine-iac]

Thanks Mark this worked great for me. Usually relied on building the surface from feature lines then doing two point surface slope labels. Now I can skip the surface build and label all the segments of a feature line by using the multi segment feature line labeling. Would hope that original poster "CLG1972" would accept this as a solution. I almost didn't view this post as it was not accepted as a solution.

[BrianHailey · Accepted solution]

For those that aren't aware, the default template that ships with Civil 3D has this expression in it already.

[troma]

I did not know that. Which year did that start in?
Had to figure this out for myself (after being informed that it wasn't possible).

[BrianHailey]

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@troma wrote:
I did not know that. Which year did that start in?
Had to figure this out for myself (after being informed that it wasn't possible).

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I don't know, about a decade ago?

[troma]

Well maybe our company template was set up wrong. Because it certainly didn't have any expressions in it. The only styles for everything were 'Standard' and 'Basic' until we made our own.

[BrianHailey]

Back in the day (I believe prior to 2009/2010 or thereabouts) Civil 3D shipped with multiple templates. Something like "Basic", "Expanded", and "LandDesktop". Later they combined them all into one template. Sounds like your company started with the "Basic". 

[CLG1972]

I was finally able to try this out and was able to get it to work. Thanks for the solution and I am sorry I was not able to answer sooner.