How do you create a stepped path for a @Link?

[Mark Summerfield]

Hi,

I'm producing a diagram with lout. I need to connect two curveboxes
using a step link path so that I can avoid colliding with a curvebox
in-between:

                               _________ 
                               | Box A |  
                               +-------+  _
                                   |      ^
                                   |      | AV
                                   |      v
                        +----------+      -
                        |                 ^
                        |                 | BV
                        |                 v
        +---------------+   ___________   -
        |                   | Box C   |
    ____|____               +---------+
    | Box B |
    +-------+
                        |<-------->|
                              H

Ideally I'd like a symbol that would do this, e.g.

    @SteppedLine avert { 1f } bvert { 1f } horiz { 2f }
    @SteppedCurveLine
    @SteppedArrow
    @SteppedCurveArrow

Only three parameters are needed, AV, BV and H.


I tried following the manual but the only path example I could find just
joined two points using a straight line. I also looked at diagf but
couldn't figure it out from that either.

Thanks!

-- 
Mark.