[Therion] Depth in the header

[Xavier Pennec]

Hi Xavier, Hi Bruce,

A trick that I used a while ago was to use the grid-origin command in 
the layout. According to Marco corvi's description 
(http://marcocorvi.altervista.org/caving/tbe/m_02/m_02a.htm): 
/grid-origin//specifies the coordinates of the grid origin. Example: 
"grid-origin 0 0 1875 m", assuming that the entrance altitude is 1875 m, 
sets the altitude values for the //|altitude|//points. Having set the 
entrance (grid origin) altitude, when you specify an "altitude" for a 
point of a wall line (with the line-point option "altitude .") the value 
of the altitude is computed and printed on the map. /

The difficulty is that all the layouts need to have the same grid-origin 
if you want to have compatible depth in different exported maps.

Hope that helps.

Xavier



Le 21-Feb-19 à 20:33, Bruce Mutton via Therion a écrit :
>
> Kia Ora Xavier
>
> I don’t have a proper answer for you.  It would seem to me that this 
> is too complicated to become a built in feature.  As you suggest, for 
> an export of one cave the problem might be easier to solve, but where 
> many caves are exported it might be difficult to conceive an automated 
> approach.
>
> Maybe an easier thing to code would be something where the user could 
> just choose a reference altitude to use as a notional zero altitude 
> for your user defined metapost?
>
> Personally I do not care much for the height relative to entrances, 
> and I have modified the header to report height like this.
>
> Together with gridlines and altitude points throughout the map, the 
> user of the map can do their own maths!
>
> Regarding ‘caves’ and ‘main entrances’, I explored some ideas in the 
> wiki here 
> <https://therion.speleo.sk/wiki/faq?s%5b%5d=entrance#how_do_i_specify_a_main_entrance_and_also_the_other_entrances> 
>
>
> Regards
>
> Bruce
>
>
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-- 
> -------------------------
> Xavier Pennec
> Senior Research Scientist / Directeur de recherche
> Asclepios project-team, INRIA Sophia-Antipolis
> 2004 Route des Lucioles, BP93
> F-06902 Sophia-Antipolis Cedex, France
> +33 4 92 38 76 64
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