Mapsforge themes compatibility

[stleusc]

are there plans to support mapsforge theme format?

[devemux86]

It's not trivial task, as they're different rendering engines.
Nevertheless it's already in todo list for VTM.

[devemux86]

Mapsforge and VTM use different priority ordering.
In Mapsforge higher priorities are drawn first (priority 1 wins priority 0).
In VTM lower priorities are drawn first (priority 0 wins priority 1).

[Longri]

Mapsforge and VTM use different zoom-levels.
VTM zoom 9 = Mapsforge zoom 10

[devemux86]

Mapsforge and VTM use different zoom-levels.

What do you mean?

If use same tile size (e.g. 512px) and exact same map position, we have the same map view.
i.e. in VTM use integer zoom, not double intermediate scales.

In #217 I explain in detail the zoom / scale in the two libs, specifically here.

Mapsforge

VTM

[Longri]

Look into theme-comparator/src/org/oscim/theme_comparator/BothMapPositionHandler.java
Line 54
Only with different zoom we have the same representation. See on Mapscale!

[devemux86]

Have you set tile size 512px in Mapsforge (default 256px) like in VTM (default 512px) ?

[devemux86]

I pushed the common tile size / zoom fix in b110314.

[devemux86]

Thanks to PR #388 by @Longri we now have Mapsforge theme compatibility!

See VTM rendering OpenAndroMaps maps with Elevate theme:

[devemux86]

Don't know if need to support the Mapsforge display directive, since VTM LabelLayer works already fine and differently than Mapsforge.

Also for any missing rules, would need first to implement them separately in VTM and then proceed with their Mapsforge support.

[devemux86]

After fixing #124, most needed functions are present and working.
So closing, any extra features can be checked in their own issues.

[devemux86]

OpenAndroMaps forum topic with feedback is here.

[devemux86]

I merged VTM + Mapsforge theme parsers for easier maintenance.