Am 05.07.2012 09:44, schrieb Frederik Ramm:
Hi,
On 06/27/2012 01:10 AM, Robert Joop wrote:
3. Modify style as per 1., double size of meta tiles to 4096x4096, and
double size of tiles to 512x512. This avoids the increase in font
nastiness *and* it has the nice effect that one "Retina" tile at a
certain zoom level shows exactly the same content as a normal tile,
just
on 512x512 instead of 256x256 and therefore at twice the resolution. It
would, however, require clients (OpenLayers et al.) to work with the
larger tile size.
This option sounded best to me as well.
I just tried this out and found that, on a standard non-mobile
Firefox browser, OpenLayers displays the new 512x512 tile just fine,
it scales it to 256x256 in the browser. I can then use the browser's
"zoom" function to blow up the OpenLayers display and while
everything becomes jaggy when I do this with normal tiles, the map
still looks nice when using the double resolution tiles. Does this
mean that it would be an acceptable viewing experience for mobile
users as well?
Most likely, I’d guess.
I’d like to try it on some devices with pixel ratio > 1, like the Nexus
One with its penTile display
http://en.wikipedia.org/wiki/Nexus_One#Hardware
or the iPhone 4.
Is your test setup publicly accessible?
It is now, here:
http://mull.geofabrik.de/hires.html
By default this will come up with standard Mapnik tiles from osm.org,
but you can switch to my hires tiles in the layer switcher. If I do
this in Firefox on my desktop machine, there's hardly any difference
between the two, as OL downscales the images from 512x512 to 256x256
for display. Only if you right-click on an image will you see that it
is indeed bigger than normal.
You may simply zoom in in Firefox using Strg+"+" to see the benefit ;)
regards
Peter
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