[Therion] Revisiting Breaking extended elevations on specific stations

[Bruce Mutton]

OK, I give up I think.  It might not be possible to break a loop at it’s closing end.

 

Tarquin’s example…

 

1   2 1    0   -10

2   3 1    0   -10

3   4 1    45  -10

4   5 1    45  -10

5   6 1    45  -10

6   7 1    90  -10

7   8 1.71 225  60

8   9 1    225  10

9  10 1    225  10

10  2 1.8  225 -32.2

7  11 1    90  -10

 

# set gap at station 2

    extend start 1

    extend ignore 2 10

    extend left 8



processing extended elevation ... 

START 1 at extendedloop

RIGHT 2 at extendedloop

RIGHT 3 at extendedloop

RIGHT 4 at extendedloop

RIGHT 5 at extendedloop

RIGHT 6 at extendedloop

RIGHT 7 at extendedloop

RIGHT 11 at extendedloop

BACK 7 at extendedloop

LEFT 8 at extendedloop

LEFT 9 at extendedloop

LEFT 10 at extendedloop

LEFT 2 at extendedloop #gap here

done

 

Looking at therion.log transcript we can see that Therion traverses 1 2 3 4 5 6 7 11, then steps back to 7 before stepping to 8 9 10 2 and consequently leaving a gap between two 2s.

 

If we had a statement to tell Therion to step back beyond 7 to 2, and THEN start generating we might get 2 10 9 8 7 and leaving a gap between two 7s.

This would play havoc with my ‘extend ignore’ rules of thumb for predicting gap locations though. https://therion.speleo.sk/wiki/extend#summary_of_all_extend_options_for_survey_centrelines

 

Another solution might be for ‘extend right 2 10’ etc to be an implied  ‘extend ignore’ for any other legs emanating from station 2.  But that would break many existing extended elevations, so although more intuitive, lets cancel that idea!

 

Bruce

 

-----Original Message-----
From: Therion <therion-bounces at speleo.sk> On Behalf Of Tarquin Wilton-Jones via Therion
Sent: Tuesday, 7 July 2020 09:12
To: Therion <therion at speleo.sk>
Cc: Tarquin Wilton-Jones <tarquin.wilton-jones at ntlworld.com>
Subject: [Therion] Revisiting Breaking extended elevations on specific stations

 

Hi all,

 

I have a puzzle that comes from my old puzzle:

 <https://therion.speleo.sk/wiki/breakingextend> https://therion.speleo.sk/wiki/breakingextend

 

1   2 1    0   -10

2   3 1    0   -10

3   4 1    45  -10

4   5 1    45  -10

5   6 1    45  -10

6   7 1    90  -10

7   8 1.71 225  60

8   9 1    225  10

9  10 1    225  10

10  2 1.8  225 -32.2

7  11 1    90  -10

 

Imagine you want to break the loop at station 7, so that Therion shows

1-2-3-4-5-6-7-11 as a single line, then 2-10-9-8-7 as a branch off it.

The break should be at the end of the branch:

    10-9-8-7

   /

1-2-3-4-5-6-7-11

 

If you say "extend ignore 7" or "extend ignore 7 6" it will do this:

1-2-10-9-8-7-11

   \

    3-4-5-6-7

Breaks at the right station, but on the wrong branch.

 

You can do "extend ignore 8 7" to break at the wrong station on the right branch. If you use "extend ignore 7 11" it ignores you, and breaks at the natural point, leg 2-3.

 

Is it actually possible to break at station 7 along the 2-10-9-8-7 branch?

 

Cheers!

 

Tarquin

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