[Therion] Offsets, map-connection lines and previews

Mon Aug 16 10:02:38 CEST 2021

I have this idea that map-connection lines should originate within the map
that they are defined in, and end within the submap that is offset.  In
other words, that they should follow the vector that describes the offset
local to the map that they are defined in.  Similarly, previews (explicitly
defined as well as when the result of an offset). Exactly as shown in the
Therion Book.

What I am finding is that the map-connection lines originate in the map that
is selected in the th-config, and end within the submap that is offset.
When there is more than one level of offset this means that they follow the
sum of all offset vectors.  In addition, previews that are the result of an
offset are not local to the map they are defined in, but appear in the
selected map (explicitly defined previews seem to be OK though).

Quite possibly I am doing something wrong, but it escapes me.

The above is the gist of mu dilemma really.  What follows is just more
tedious detail.

I am trying to create a plan map of a vertical cave, where each of the
submaps have a map-connection line between them.  I am planning to export
them to a map (I'm not thinking of atlas at this stage).

Juraj Halama showed us an example last year

And explained how to get the submap to submap map-connection lines, as well
as the overall (radial selected map to submap) map-connection lines in this
post.

https://www.mail-archive.com/therion@speleo.sk/msg08318.html  It seems to
have about the right level of complexity to achieve two sets of
map-connections, but too much for a typical single set of map-connection
lines.

I am looking for only submap to submap map-connections, as shown in the
Therion Book, and the example suggests that this is the norm.

And so I am using syntax that I hope is like this.

and

And select m123 in my thconfig.

But alas I am only getting radial offsets from the 'selected' map.

My hope is that the pattern shown in the Therion Book can be nested without
limit, but I have only ever been able to nest it two levels successfully as
with the Therion Book (although just now I cannot even do that for some
reason - but it did work a year ago when I last tried) 

Once a third level is introduced the offsets go radial from the selected
map, and not submap to submap.

The diagram below shows my map names with three levels of offsets (offset of
offset of offset).  It also compares the  map-connection lines that I get,
compared with what I expect. In all cases the thconfig only selects
LaghuPlanMap.

When I am done, I think this particular project will require 8 to 10 levels
of offset, so I am hoping there will be an easy pattern to follow.

An example: Offset of offset - These definitions produce the maps below.

map LaghuPlanMap -title "Laghu Cave Plan, Mt Arthur"
like m123 in Therion Book example

#select this map when exporting a pdf plan with offset maps

    9-LaghuPlan-surface at Laghu #entrance pit
like m1 in Therion Book example

    Laghu #survey centreline

    LaghuPlanMap-1over2 [-050 000 m] below #top level offset map
like m23 in Therion Book example

endmap LaghuPlanMap

map LaghuPlanMap-1over2 #next level down, midP3
like m23 in Therion Book example

              LaghuPlanMap-1
like m2

              LaghuPlanMap-2  [000 020 m] below # next offset level
like m3

endmap

map LaghuPlanMap-1 #top level offset map
like m2

    preview above 9-LaghuPlan-surface at Laghu 

              9-LaghuPlan-underground at Laghu   # point map-connection in here
plots correctly in offset level one

              7-LaghuPlan-upperP1P2 at Laghu

              7-LaghuPlan-midP2P3 at Laghu

              preview below LaghuPlanMap-2
like m3

endmap

 map LaghuPlanMap-2 #next level down, midP3
like m3

              7-LaghuPlan-midP3 at Laghu   # point map-connection plots
incorrectly in offset level two

endmap

I can see that select xxx -map-level 1, 2 and 3 etc have an incremental and
negative effect on the display of passage previews, but I don't understand
the guidance in the Therion Book on this.  

"preview <above/below> <other map id> will put the outline of the other map
in the specified preview position relative to the current map.
Preview is displayed only if the map is in the map-level level as specified
by the select command.
Use the revise command if you want to add maps from higher levels to the
preview."

So I am not using -map-level in these examples, and it seems to interfere
with the offsets anyway.  I'm not sure if revise would help, or how to use
it, but expect it might have some use with previews that appear in the wrong
position.

Any insights appreciated.

Bruce

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