This change adds a lot of flexibility to working with tile
layers: Sources where the server projection or tile grid do not
matter can now be constructed without specifying a projection or
tile grid.
The tileUrlFunction/imageUrlFunction now also creates updated
URLs when the params of the layer change, so things like
mergeNewParams in ol2 will be possible.
A nice side effect of this whole change is that there is no more
duplicated code between tiled and single image WMS layers.
While I was at it, I also fixed a WMS 1.1.1 axis order issue
and incorrect STYLES params (STYLES=& instead of STYLES&).
Now vector layers can have a style. ol.Style instances have an
apply method to get the symbolizer literals for a feature. If the
layer does not have a style defined, there is also a static
applyDefaultStyle function on ol.Style to get the default
symbolizer literals for a feature. The vector layer also got a
groupFeaturesBySymbolizerLiteral method, which returns an array
with features grouped by symbolizer, as needed by the canvas
renderer.
If we have a gridded vector source, the grid should have something to do with the source data (e.g. the vector data is available in a regular grid). The vector layer renderer's internal grid is for rendering canvas tiles and doesn't have anything to do with the source.
We should discuss whether post render functions must be run after each render frame or not. If these can be run after multiple render frames, it would make sense to increase the timeout. As it is, it looks like post render functions are run for every render. Hard to see what the benefit is in this case.
Instead of going into an unnecessary animation loop, we can simply wait to be notified when tiles load.
The WebGL renderer still sets frameState.animate true, but I think this too should be unnecessary (full page example works without it, side-by-side example shows it cannot yet be removed).
Instead of keeping track of wanted tile ranges, we can instead track wanted tiles individually. This provides enough for the map to know how to prioritize tiles and should be more efficient (no extra calls to extend tile ranges or check for tile containment within a range).
ahocevar
Tim Schaub
Éric Lemoine
Tom Payne
Frédéric Junod
Bruno Binet