I really feel, we need a "true" way of specifying how to hide/select
things for various outputs.
Some kind of optional selector attribute inherent to any symbol, without
affecting or misuing the other settings.
This cuold also be used to hide/select symbols based on scale (which is
currently kind-of-supported by using the symbol size - which I cannot
use beause I need that for actual sizing of stuff).
A quick Idea could be:
1. untagged elements are always printed
2. tagged elements only if they are selected in the thconfig
3. actual systematic is user-defined, so we have maximum flexibility.
For example, I could imagine mixing several systematics, one for desired
output scale and another for special purposes:
--------- thconfig --------
select tag scale:250
select tag scale:500
select tag remarks
select tag crossSections:abc
export map ....
---------------------------
In the th2's I just tag the items with "-tag scale:500" or "-tag
crossSections:abc" (or both).
This would completely (and optionally) decouple the show/hide from
internal magic and support various usecases out of the box. One just
needs to think of a good tagging systematic for his usecases/dataset.
Am 2025-02-19 17:29, schrieb Andrew Atkinson:
On 19/02/2025 15:58, Bill Gee wrote:
I would also like a way to produce a map which has SOME (not all)
cross- sections. Right now it is all or nothing. You either get
every cross- section or you get no cross-sections. This might be done
by using PDF layers and letting the cross-section scrap specify the
layer it goes on.
You can sort of do this with
-attr <name> <value>. <name>
Then use this in metapost
p36 thbook
You can test presence of such a variable using if known ATTR_<name>:
... fi.
However, my metapost was not good enough and I kept getting bugs. So I
used python to pull them out, then removed the ones I wanted. I thought
I had put the code online, but cannot find it!
However, the use of attr would work better if symbol-hide worked for
it. Unfortunately I do not think that it does.
You could abuse the system by abusing the -context option and setting
it to a symbol you do not use then turn that off with symbol-hide.
Andrew
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