[Therion] Extended elevation control - Embedded image does not appear in some layouts

[Tarquin Wilton-Jones]

> It would be nice to have a way to break extended profiles into sections 
> so they can be placed at different points around the map.


Sure, easy enough. Create them as maps, just like you would do if you 
wanted partial plans.

map shiningcave -projection extended -title "Shining Cave elevation"
   entareaMEE at entarea
   shiningpitchesMEE at shiningpitches
   ...
endmap

map beetlecave -projection extended -title "Beetle Cave elevation"
   crayonsMEE at crayons
   wetcrawlsMEE at wetcrawls
   ...
endmap

In your .thconfig, select whichever map you want to output. Output it as 
a PDF. Embed it in your main plan view, just like you would embed any 
other image.

> which angle was specified for each section of profile.


Extended elevations have no angle. They are an *extended* side view.

Projected elevations have an angle - the cave from a specific direction. 
With a projected elevation, you need to make sure you always export the 
same bearing. It's awkward with big caves.

> I think it could be done 
> with either a border or a section line with no arrows.


I created a l-u-route for showing routes. It draws dots along the route. 
You could do something similar. If you just want to draw it as a solid 
line, then the MetaPost can just pick up a pen, and draw the path with 
it. (That's the easiest. Dots is a dashed line, but I have done a load 
of calculations in the MetaPost to avoid drawing half a dot, so the code 
is quite long.)

> I would also like a way to produce a map which has SOME (not all) 
> cross-sections.


Put them in different scraps instead of putting them all in the main 
plan scraps. Eg. "mainsectionsSP" and "lessersectionsSP". Each scrap you 
put them in should reuse a few stations so they all get scaled and 
positioned correctly.

Then your map should add the appropriate scrap just like it adds any 
other scrap.