[Therion] Main route through a cave

[Steve Clark]

For cave-diving purposes, we added a custom line type to represent the 
dive line with the cave. We can then change the properties of this if we 
want to turn it on/off or change the style in one place.

Added this code to layout :

def l_u_caveline (expr P) =
T:=identity;
pickup PenB;
thdraw P withcolor (1, 0.5, 0);
enddef;
initsymbol("l_u_caveline");

We then drew the line on in each relevant scrap. Generally, it followed 
the centre-line but it can be drawn in the centre of the passage instead.

example pdf here, the cave line is orange :

https://www.dropbox.com/s/watp4mkphcsd1zj/St_Georges_1-1000_v1.4.pdf?dl=0

We also used custom areas to represent the water, using invisible 
borders where necessary. You could maybe colour areas on the main route.

Steve Clark


On 13/06/2021 19:47, Tarquin Wilton-Jones via Therion wrote:
> On 13/06/2021 12:17, Axel wrote:
>> an additional thought just occoured to me:
>> If u draw a mainroute-line wouldn't it be possible for the coding-gurus
>> to get the length and maybe the altitude difference of that line type?
> I would have thought the easier way would be a "flags" switch that could
> do it for you. "flags mainroute". It wouldn't even be an estimate. Maybe
> some of the Survex folks on this list could shed some light on how
> feasible that would be. Might require a Survex modification though.
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