[Therion] Point altitude/deph, Help !

[Xavier Robert]

Hi Xavier, 

Thanks a lot for your answer. I already tough at that trick, but if I do that, I loose the altitude information, and I do not want to loose it. 

Cheers, 

Xavier 


_____________________________________________________________ 
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 | 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 




De: "List for Therion users" <therion at speleo.sk> 
À: "List for Therion users" <therion at speleo.sk> 
Cc: "Xavier Robert" <xavier.robert at univ-grenoble-alpes.fr> 
Envoyé: Jeudi 21 Février 2019 13:28:21 
Objet: [Therion] Point altitude/deph, Help ! 

Dear all, 

On the caves’ survey I draw, I am often adding the altitude of points that are characteristic in the cave by using the point « altitude ». I find that really great and I want to keep it. 

However, I received several remarks from my co-cavers/surveyors that this is not quite readable, and that they would prefer if I can also add the depth since the entrance at those points. I can do it manually with the point label, but for a complex system, that will be a pain to maintain each time we add a new survey or a connection with an other cave previously unconnected. 

I thus tried to add a new user defined point (u:prof) based on the present altitude definition. However I am really not a mpost guru and I am facing two problems. Here is the code I wrote : 

###### New point depth ###### 
code metapost 
def p_u_prof (expr pos, R, S, A) = 
T:=identity aligned A scaled 1.5S rotated R shifted pos; 
# calcul of the depth of the point: altitude of the point - altitude max of the cave 
# (it will be better with the altitude of the main entrance 
# defined by the option -entrance of the survey block) 
depth := \thaltitude - \cavemaxz; 
# Print the label 
begingroup 
interim defaultscale:=1; 
label (btex {-- } depth {m --} etex, (0, 0)) transformed T withcolor(0.5,0.,0.); 
# 1) Why is profondeur value NOT printed ? Where is the error ? 
endgroup; 
enddef; 
initsymbol("p_u_prof") 
endcode 
############################## 

The problem is that this point will print the text "-- depth m --", but not the value of the depth. I suspect that : 


    1. the depth calcul may not be accurate? 
    2. the way I call the variable depth is not accurate? 

Does anyone has a clue for that problem? 


My second problem/question deals with the way to calculate the depth. Here I try to calculate it by using the maximum altitude of the cave (\cavemaxz). But it should be better if I use the altitude of the main entrance if it exists. But I did not find if there is such a varaible already defined. Does anyone knows how to do that ? 

Cheers, 

Xavier 


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