Survex 1.1.5 - A couple of LRUD features

[Olly Betts]

On Wed, Oct 05, 2005 at 12:12:50PM +0100, Mike McCombe wrote:
> Omitting one dimension seems to result in not just that specific dimension
> being omitted, but all of the remaining dimensions on that line.

OK, it's a stupid mistake.  The data reader doesn't discard the "omit"
token when it hits it here, so it interprets it for all remaining
dimensions (and then the "ignoreall" you're presumably using eats the
unread readings).

It's a one line fix, which will be in the next snapshot (hopefully
quite soon).

> An interesting behaviour in Aven happens when I have a centreline which is a
> straight line N/S or E/W. Aven opens in "elevation" mode, shows no
> "Elevation" or "facing" controls and ignores the "P" and "L" commands.

Yeah, this special handling is really there for extended elevations.  It
doesn't make sense to allow those to be rotated away from flat.

> However, the mouse-wheel still tilts the survey. Perhaps this has something
> to do with the centreline plan being "one-dimensional" on the screen. It
> still does it when my "one-dimensional" passage has finite width from the
> LRUD passage data.

I suspect the mouse-wheel tilt goes via a different route, so isn't
checked to see if the survey is locked flat.

Do you think a flat elevation, because it may have L and R data making
it actually non-flat?

Extend now preserves UD (but discards LR), so it still makes sense to
lock extended elevations I think, but we can check for those in another
way if need be.

We also currently lock a flat plan survey down I think in a similar way.
That's rather more of an issue I think (a flat plan survey is more
likely to occur in real life than a flat elevation survey).

Cheers,
    Olly