If I have understood your question correctly...the "start"of the style curve, and thus the 0 value, is determined by how the curveis create on the screen. I.E. left to right or right to left. In other words the fist point of the curve segment is "zero" and will be the end the length measurement will originate from. It's kind of a bad deal asone never knows in advance all theelements of the superfeature.
Hope it helps.
In Reply to Doug Barton:
When you attach a style curve end point to another curve/edge it allows
you to set the distance from one end of the reference you attach it to.
However, it typically uses the "wrong" end to measure from, and I don't
see any way to switch which end it measures from. Is it possible to
select either end as the reference to measure from? Or does how you
select the reference curve make a difference?
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