Render themes: stroke dash array

[stleusc]

not much else to say ;-)

[devemux86]

We have line stipples implemented in #105, a good base for that.

Reference opensciencemap#3

[Klaus-Tockloth]

Dashed lines are very important in maps. Stipples aren't a surrogate for dashed lines because the underlaying object is always overwritten. Sometimes this ok but in most times it isn't. See example:

[devemux86]

the underlaying object is always overwritten

@Klaus-Tockloth what do you mean?
We can use transparency in stipples too.

[Klaus-Tockloth]

What I want to achieve is this: A short line followed by a gap followed by a short line and so one. In the gap one sees the underlaying object. In the picture above this is the wood area (with the tree symbols). My understanding of the stipples feature is, that you always have a solid line, and on top of this line you draw the stipples. If you make the stipples semitransparent you see the underlaying solid line but not the underlaying wood. Right?

PS: For a railway stipples are a possible option, but for the track (brown line) they are not.

[devemux86]

We can have in stipples the stroke color semi or completely transparent, see here.

Still this pattern doesn't have the flexibility of dasharray's various combinations.

[devemux86]

Thanks to PR #388 by @Longri for Mapsforge theme compatibility, we now have an implementation of line stroke dash array also in VTM themes.

[andreynovikov]

dasharray in style-line does not work. If I put it there no line is drawn at all, if I remove it, solid line is drawn. If I put dasharray in line it is still not drawn. If I remove dasharray from style-line it is drawn correctly.

[andreynovikov]

fix="true" seems not to be honored too.

[devemux86]

@andreynovikov thanks for the report!
See if latest update handles the issues.