[Therion] Extended elevations - development snapshot (commit 6860f82)

[Bruce Mutton]

Stacho

> there is a possibility to specify reduction ratio for extended elevation
(0 = vertical, 100 = normal left/right) - just use "extend <number>"

 

I have made this work, by placing 'extend <number>' statements in-line with
the survey data, but that seems to be the only way it will work.  Every
combination I could think of with the extend controls in a separate
centreline or block results in an error.

 

For an example I have managed to make this extended centreline.

 



 

.into this by using strategically placed 'extend 50', 'extend 100', and
'extend 75', as well as an 'extend vertical'.  It now matches more closely
what one would expect by looking at the plan view.

 



 

So it works very well, but the difficulty I have is that to make the
extended elevation control manageable, it needs to be separated out (in one
place) from the survey data, but now any control of the extend ratio must be
in-line with the data.  This makes it very confusing and difficult to
manage.  

 

Is there any chance that the ratio could be controlled by statements in
separate centrelines, as with left/right/vertical etc?

 

Maybe by allowing the form 'extend [left <ratio>] <station1> <station2>' as
an equivalent to the in-line statements 'extend <ratio>' and then 'extend
left'?

(I am thinking of similar syntax to 'export map -projection [elevation 290
deg]' where the square brackets are required if the default is not what is
wanted).

 

 

The extend ratios are applied to splays as well as to legs, which is usually
desirable, except sometimes where the ratio approaches zero.  If the user is
to control splay ratios separately to the legs, then I guess the only option
is to put the extend ratio statements in-line.

 

And one more thing.  The range is limited from 0 to 100%.  If we are going
to allow distortion of the extended elevation, then I think the upper limit
should be something like 150% or 200%.

 

Bruce

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