PL signalling - pointers, their position on light signals, rendering

[Anasmasuris]

Hey there!
I tried to edit the code myself, but I couldn't overcome it

I've uploaded more precise SVG files for W18 (station_distant), W19 and W20 (braking_distance), W24 (wrong_road), W32 (stop with given length) pointers: https://wiki.openstreetmap.org/wiki/Pl:OpenRailwayMap/Tagging_in_Poland/Pointers (also available at commons.wikimedia)

For W20 the sufficient factor is railway:signal:...:shortened=yes
For W19 the sufficient factor is railway:signal:braking_distance=PL-PKP:w19 (notice, there could be a combination PL-PKP:w19;PL-PKP:w20)

1. In PL, almost all secondary/tertiary etc. signals on light semaphores are placed below the lowest light cell. There's also a hierarchy in placing them, in short:

• W24 > W20 > W19, meaning W24 is placed the highest of given
• W18 > W19

2. Basically, main and combined are the same, the number of light cells depends only on the states. 2-cell signal can have only main, while 3-cell can have both combined or main. 4- and 5- must have combined. Thus below I've written the limiting factors for all existing types of light semaphores:

• 2-cell (dwukomorowy): main + (S2 or S5)
• 3-cell (trzykomorowy): (S2 + S5) or (S2 + PL-PKP:sz) or (S5 + PL-PKP:sz) or (S13) or (S13a)
• 4-cell (czterokomorowy): (PL-PKP:sz + (S6 or S10 or S10a or S13 or S13a or S2 + S5) ) or S1a
• 5-cell (pięciokomorowy): (S6 + S9) or (S10 + S13) or (S10a + S13a)

where SX stands for PL-PKP:sx state and PL-PKP:sz stands for railway:signal:...:substitute_signal=PL-PKP:sz for main or combined signal

If that could work, then the legend could be divided into 4 groups of light semaphores

4. I standardized the tagging for metro pointers in PL after you added the .png icons here (my mistake), thus the only change should be from ZTM-MW prefix to PL-metro

Thank you for your hard work
Anas masuris

[Anasmasuris]

For the 2. point, I made a chart for deciding, which graphic should be rendered. I hope it could be helpful, but I guess the regex works much more different:

https://wiki.openstreetmap.org/wiki/Pl:OpenRailwayMap/Tagging_in_Poland/Signals_and_displays

[hiddewie]

This is very nice input, thanks 👍

[Anasmasuris]

All changes should be present in my pull request, so I think I can close this discussion

[hiddewie]

For future reference, this is #265