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
+33 6 78 35 16 90
http://www-sop.inria.fr/asclepios/
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