points and vertices offset in aven

[Wookey]

I've just noticed that on an extremely large dataset there is an
offset between station positions and line vertexes, (of about 4-5cm in
the examples below), visible when the scale bar is between 5m and 1m
long.  The whole dataset is (due to a coordinate cockup) 5million
metres long, so we are getting into the limits of the sliding point
resolution, no doubt. However why would the leg vertices and the
station positions be slightly different? They represent the same location/co-ordinates.

This does not appear with 'normal sized' datasets. Quite possibly the
offset is still there, but too small to be visible?

(Debian, survex 1.4.2, on a high-DPI screen in case it matters)

An example illustrating the issue is here:
http://wookware.org/files/1623.3d

turn on surface legs, search for p161a or p258b and zoom in all the way to see this issue.

Here is a trivial test case to illustrate it:
*fix e1 0 0 1800
*fix e2 52000000 3000000 2000

*equate e1 1
*equate e2 2

1 2 350 28 -7
2 3 200 95 +3

process that, search for e2 and zoom in all the way. The station (i.e
highlight point, label and mouse hotspot area) is offset from the
vertex. Which doesn't seem right.

Why?

Wookey
-- 
Principal hats:  Debian, Wookware, ARM
http://wookware.org/
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