I would like to create a line based detail family which sits 1'9" away from the line I am clicking on to place, with an arrow at the beginning and the end. We use this in our Wall Finish plans, and placing detail lines with arrows is very time intensive!
In this image - highlighted is what I want. The red is what I am getting. You can see how far I have gotten in the attached family. Thank you!
We use a similar system to indicate paint finishes on plan. It is just a symbol and arrows added to it.
It is kind of an impossible task given the limitations of line based detail items i.e. to get the extension value for each non-arrow continuation end you need to know the angle between the current segment and the last segment. In the below since the detail item doesn't know the value of 'x' it can't know the extension value of 'y'. It also doesn't know if it is extending or cutting back i.e. if angle is internal or external.
It would be easier to make the end extensions instance parameters so you could drag them together. Also to get a line based detail item to indicate what @ToanDN has shown is relatively easy because each segment starts and stops. The only awkward issue there would be for the acute angles where the items may overlap at the corners but I've not seen many of those. So likely if you change the form of the symbol then your life gets generally easier for this anyway.
The way I've seen it done is that each wall type has certain finishes for the external and internal side. Therefore you can apply visibility filters to colour those wall types on plan and then have legend that indicates for each colour what the external and internal paint is (amongst other properties). Obviously you still need a symbol of some nature to indicate side 1 and side 2 on plan (for internal partitions). I think that cuts down on a lot of annotation work and gets you closer to automatically representing the information in the model elements.
