getTile and the tileUrlFunc are functions of the source, so they do need to be passed the tile grid. The tile source knows its tile grid, and can get the projection's tile grid if it doesn't have a tile grid.
This massively reduces the number of temporary ol.TileCoord objects.
Previously an ol.TileCoord object was generated for every potentially
visible tile at the current zoom level and lower, every frame. This
commit eliminates all of those. Now new ol.TileCoord objects are only
allocated when a new tile is created.
This change removes all changes that were anticipated here for
WMS GetFeatureInfo handling, including the IWMS interface and
the goog.provide for 'ol.tilegrid'. I'll create a separate pull
request for WMS GetFeatureInfo eventually, taking into account
the suggestions from the discussion in #402.
With this change, url functions are called in the scope of the
source they are configured for. This allows us to simplify the
url function generation for WMS, using a more generic
createFromParamsFunction factory, and the source's new params
member.
Note that there is also a new url member for WMS sources. This
is the WMS base url (the first one in case there is an array of
urls for faster tile access). This can be used for accessing
other WMS services (especially GetFeatureInfo).
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&).
The first set geometry is considered the default. As an added bonus, we're back to a single argument constructor. Later, we could allow a schema to be set. This would be done before setting values (calling constructor with no args).
Previously, the findInterimTiles method was returning undefined if the min x/y coord for a tile range was already in the lookup. The return says it indicates whether all tiles for the given z are loaded. This change corrects the return.
This change also reveals a misunderstanding of the tile range returned by `getTileRangeForExtentAndZ`. The previous findInterimTiles method was treating max values as inclusive. This is intuitive. It looks like the method returns a range where max values are exclusive.
With this commit test files provide namespaces (using goog.provide). This fixes the issue reported by @bartvde where goog objects cannot be used in Jasmine "describe" functions. It also frees us from having to add script tags for the test files in test/ol.html.
