more options for vector tile sources

[mschilde]

Sorry for the issue-less PR.

This PR extends the RLayers support for options supported by the OL SourceVectorTile constructor. I.e. you can now specify a lot more options when using RLayerVectorTile.

My original motivation was that OL vector tile layers don't really support overzooming.

E.g. if a vector tile source only supports tiles up to zoom level 15 the only way to allow zooming past that level is to provide a custom loader function. There's also an OL example which is referenced in a lot of the overzooming Github issues.

Passing this loader function to the OL tile source is not possible at the moment.

I also added the other options supported by the source, e.g. tileGrid, tileSize etc.

Open points up for debate:

• I moved some of the options directly to the base props in RLayerProps (wrapX, cacheSize), they seem to be supported by most sources. We had this discussion before :-) If you're ok with it I can propagate the more common options to the supported sources.

• I saw there's an intermediate interface RLayerBaseVectorProps which supports some of the missing options. But extending this interface instead of RLayerProps gives a few errors which I didn't dare to fix. I can give it a shot if you'd rather have the vector specific props there.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d98cf45) 98.43% compared to head (9ce070e) 98.43%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #177   +/-   ##
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  Coverage   98.43%   98.43%           
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  Files          74       74           
  Lines        1532     1532           
  Branches      253      253           
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  Hits         1508     1508           
  Misses         24       24           

Files Changed	Coverage Δ
src/layer/RLayer.tsx	100.00% <ø> (ø)
src/layer/RLayerVectorTile.tsx	100.00% <ø> (ø)

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[mmomtchev]

You realize that these option will be fixed? Ie, if your component is updated, they won't be refreshed.

[mschilde]

I'd need a bit more feedback, I'm not super familiar with the rlayers codebase. Are you talking about the refresh function?

[mmomtchev]

Yes, the refresh function is called when React updates a component - but in fact OpenLayers does not support modifying any of those properties once the layer is created. RLayerTileWMS has the same problem and it works around ot by deleting the underlying layer and creating a new one.