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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