Re: [udig-devel] An update on WMS-C tiles and uDig

[Ugo Taddei <ugo.taddei@xxxxxxxxxxxxxxxxxx>]

Hello Graham,

this is all great news! What servers have you guys tried out? 
(TileCache? GeoServer/GeoWebCache? Are there others?)

Thanks,

Ugo

Graham Davis wrote:
> Hi,
>
> This is just an update on some of the functionality Emily G. and I have 
> added to uDig trunk in the last few weeks.  Some of this may be old 
> news, but it is a quick run-down of the changes we've been making.
>
> WMS-C Tile servers are now supported in the catalog and there are some 
> preferences you can set in regards to this.  On the "WMS-C Tiles" 
> preferences page you can set the maximum number of concurrent tile 
> requests (ie: if this is set to 8 it will use a thread pool size of 8 
> and only send of a max of 8 tile requests at a time and wait before 
> sending more), whether to use in-memory cache or on-disk cache, and you 
> can also set where to cache tiles on disk or choose to clear the current 
> cache.
>
> Additionally, there is an operation that allows you to right-click on 
> any WMS-C Tile layer in the catalog view and choose to preload all the 
> tiles for that layer and cache them on disk.  This runs in a blocking 
> dialog with a progress bar since the layer could potentially contain 
> hundreds of thousands of tiles and doing so many continuous requests and 
> disk writing can be resource heavy.  These tile requests are sent off in 
> groups (default is 16 but this can be tweaked with the "max concurrent 
> requests" preference mentioned above) and can take a while.  Beware that 
> the onslaught of so many continuous requests could potentially bog down 
> the WMS-C server you are loading the tiles from.
>
> There is also a new tiled rendering system that can be used for 
> rendering any data in uDig.  This can be turned on in the "Rendering" 
> preference page.  It provides a cleaner flicker-free panning experience 
> when viewing maps in uDig.  Emily has mentioned this before via email, 
> but there is also a new Scroll Pan Tool which works very well when tiled 
> rendering is turned on.  Emily has also cleaned up the rendering stack a 
> lot, including removing some unnecessary render events.


--
Ugo Taddei

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