[Therion] Question about "\cavedepth" and Northarrow

[Stacho Mudrak]

I think, the idea with variables containing coordinate extents and
modification of layout should do the job. I will try to implement it, in
the next snapshot.

And here is the layout code for your north arrow:

def s_northarrow (expr rot) =
  T:=identity;
  picture tmp_pic;
  tmp_pic = image (
    begingroup
      interim defaultscale:=3;
      label.top("N", origin shifted (0,2.2cm));
    endgroup;
    thdraw
(-.4cm,.4cm)--(0,2cm)--(.4cm,.4cm)--(2cm,0cm)--(.4cm,-.4cm)--(0,-2cm)--(-.4cm,-.4cm)--(-2cm,0)--cycle;
    thfill (-.4cm,.4cm)--(0,2cm)--(0,0)--cycle;
    thfill (.4cm,-.4cm)--(0,-2cm)--(0,0)--cycle;
    thfill (.4cm,.4cm)--(2cm,0)--(0,0)--cycle;
    thfill (-.4cm,-.4cm)--(-2cm,0)--(0,0)--cycle;
  );
  draw tmp_pic scaled 0.5 rotatedaround(origin, -rot);
enddef;


S.


On 3 April 2014 21:19, Bruce <bruce at tomo.co.nz> wrote:

> Torsten
> If indeed the 'cave' you have entered has a depth range between -15m and
> -20m, then I would expect the depth to be reported as (+)5m.  (I presume
> this is a sea cave, with altitudes below sea level - but it would also be
> OK
> if you are using an arbitrary altitude datum).
>
> Same as a dry cave that starts at 100m and descends to 95m.  It's depth
> would be reported as (+)5m, not 100m.
>
> Maybe the solution for you is to add altitude points to the wall near each
> end, so that the altitudes are plotted directly on the map.
>
> Or you could add a (manual) map-comment to the header "maximum depth: 20m"
>
> Another idea, therion may store variables that define the maximum
> coordinate
> range.  If so, then it would simply be a matter of a small metapost to
> report the minimum altitude.  Stacho? Martin?
>
> Bruce
>
> -----Original Message-----
> From: therion-bounces at speleo.sk [mailto:therion-bounces at speleo.sk] On
> Behalf
> Of Torsten Schnitter
> Sent: Friday, 4 April 2014 2:28 a.m.
> To: therion at speleo.sk
> Subject: [Therion] Question about "\cavedepth" and Northarrow
>
> Hi all
>
> I'm wondering a bit about the results from the variable \cavedepth.
> May be it's not correct this way or I do have a different understanding and
> someone can explain to me why it is this way.
>
> I'm drawing a map (with scraps, points, walls etc) containing just a
> sidepassage
> of the entire cavesystem.
> Concerining the survey data I'm using "data diving ..." within centerline.
>
> The result from \cavedepth is now the maximum difference between the
> shallowest
> and deepest point of that part of the cave.
> E.g.: If I have surveypoints in this part of the cave from -15m to -20m the
> result in the header using \cavedepth is -5m.
> What I did expect to get from \cavedepth was the maximum depth of this part
> of
> the cave, so -20m.
> Because this is the relevant info to cavedivers.
>
> Is there any way to get this result without using the override from
> \cavedepth?
> I would like to use the automatic calculation of course but also want to
> get
> the
> maximum depth under water.
>
> 2nd question:
> I would like to use a northarrow as you can see in the attached file.
> Does anyone have some code for that?
>
> Thanks for your help.
>
> cheers,
> Torsten
>
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