[Therion] Shortening long passages in extended elevations

[Martin Sluka]

Define several maps, export them separately and use -map-image to place them in one export.

As continuatuon line you may modify user line strata https://therion.speleo.sk/wiki/metapost#line_symbols <https://therion.speleo.sk/wiki/metapost#line_symbols>

Martin





> 20. 12. 2019 v 10:00, Tarquin Wilton-Jones via Therion <therion at speleo.sk>:
> 
> Hi all,
> 
> With extended elevations, you might want to show only the most important
> parts, like pitches, while showing long passages as a shorter distance
> with a break symbol. Imagine a cave with an initial pitch, a long
> passage, and a final pitch, where the extended elevation should
> concentrate on the detail of the pitches only, and not have the long
> passage wasting space. For a real example, see this rigging topo:
> 
> https://cncc.org.uk/caving/topos/download-single.php?id=6
> 
> If the passage is horizontal, you could easily achieve this by setting
> the legs of the long passage to "extend vertical", so that its stations
> to not take up any horizontal length. You can then manually draw the gap
> with some lines.
> 
> However, if the long passage slopes downwards, this will make the two
> parts of the passage break with a vertical gap between them. This makes
> sense because it means that the extended elevation will show the
> vertical range of the cave, which is great if that's what you are hoping
> for. But in a rigging topo, it is less useful. There is no equivalent
> that I can see to "extend equate 21 57", which would be an equate that
> happens only during an extended elevation. Essentially, this is the
> desired outcome though.
> 
> For a real example, see this rigging topo - the breaks represent a
> passage that has lost as much as 20 metres of altitude, which is
> completely ignored:
> 
> https://cncc.org.uk/caving/topos/download-single.php?id=61
> 
> One method I can think of - but it feels like a hack - is to draw the
> upper pitch in one map, and the lower pitch in another map, then use map
> offsets to pull the lower map into the desired position when rendering.
> 
> Does anyone have a better solution to this? Can "extend hide" do
> something useful or will that still keep any vertical (and horizontal)
> offsets?
> 
> Thanks for any advice.
> 
> Tarquin
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