Add -difficult and -expert hiking path grades

[pastk]

Depends on #7925

• "expert" is dotted black (sac_scale T4+ or "horrible / no" visibility)
• "difficult" is dotted brown (sac_scale T3 or "bad" visibility)
• "normal" is brown dashed

A rough draft (z16, low dpi): (check more fresh screenshots in later posts)

• closes https://github.com/organicmaps/organicmaps/issues/6593
• closes https://github.com/organicmaps/organicmaps/pull/7810
• closes #6447
• related #7430

[biodranik]

How the map will look in Swiss hikes and in cities?

[pastk]

Nothing will change in cities as difficult hiking trails are not supposed to be there :) What do you mean by Swiss hikes? The tagging is the same. If you want to see some particular Switzerland region then generate the map please, for my laptop its very heavy.

[pastk]

In future, marked routes highlighting could be implemented by colored underlines, a rough DEMO

[patepelo]

It would be cool in the future to add a functionality that when one zooms in to the desired path, the different characteristics appear on pair with the name label. It would act as an interactive legend.

For example:

Zoom 12: "Elephant path" Zoom 15: "Elephant path / SAC T3"

[map-per]

I like this PR, it fits to the OM map style quite well and it is not as experimental as #7810.

I would add these changes to the main style as well, in order to highlight dangerous / difficult paths.

[pastk]

Higher dpi screenshots:

In the main style its the same pattern types but less fat and less visible just like as it is now

[biodranik]

An important question: do we need many different styles/colors for similar paths in the main style?

[pastk]

An important question: do we need many different styles/colors for similar paths in the main style?

Not really.

Actually initially I was going to display both difficult and expert trails as dotted black in the main style, but then

• users might be confused that translations are different (some "expert", some "difficult") while the looks are the same
• there might be confusion when users switch between styles and some paths change their looks suddenly while others don't
• all these patterns are not screaming different and not attracting attention, so the value of removing one of them doesn't worth the cons IMHO

[biodranik]

Conflicts?

Is this change only for outdoors style?

[pastk]

Conflicts?

I'll rebase later when the test data is ready.

Is this change only for outdoors style?

The last screenshot is for the main style.

[biodranik]

I'm ok to test these changes in the Outdoor style, but have doubts about the generic main style.

[vng]

Regular highway=path is drawn the same as before.

[pastk]

I'm ok to test these changes in the Outdoor style, but have doubts about the generic main style.

What do you propose for the main style? The styles could be changed in a separate PR if needed. But for the Outdoors style to work the new types should be merged and included into the data gen anyway.