i was trying to make a line that would keep its center point. i used two lines and fixed the vertex connecting the two. i also had to add a short line at each end so i could attach my dimension to it because i couldn't dimension between vertex's. when i increase the dimension one of the lines takes off in the blue direction. try it out.
i think these problems could be solved by adding the ability to fix a center point, and being able to dimension between two vertex's.
Click to view attachment
change file extension to dim.skp i named it dim.zip so i could attach it.
Click to view attachment
