Ok, it works now.
To do that I configured my layer's serverResolutions with the same array I set
up for resolutions.
Only with this trick tiles are not correctly displayed because Zoomify functions
getURL and getImageSize use:
var res = this.map.getResolution();
...
var z = this.map.getZoom();
instead of:
var res = this.getServerResolution();
...
var z = this.getZoomForResolution( res );
With this patch and layer correct configuration, fractionalZoom works for me
with Zoomify layer.
Do you think this patch is correct or should I take care of some specials cases
?
Regards
David
On 27/06/2012 15:00, Andreas Hocevar wrote:
To achieve this, it should be enough to configure your layer's
serverResolutions with the same array that you have set for
resolutions.
Andreas.
On Wed, Jun 27, 2012 at 2:46 PM, David Régade<[email protected]> wrote:
I tried this solution too and it didn't work. I had a look to this example:
http://openlayers.org/dev/examples/fractional-zoom.html
In this example tile size is allways 256x256 whatever the zoom level. But
with zoomify it can't be allways 256x256 because tiles have to be streched
or shrinked according to zoom level. zoomify relies on direct tile image url
, not a mapserver like the example above. These direct images urls have
fixed dimensions and represent allways the same "world region".
That's why I can't figure out fractionalZoom can work with Zoomify layer if
the displayed tile have allways the same size.
A solution could be to setup the integer zoom for the layer and scale the
layer (like transformDiv() does) to obtain the good result.
Regards
David
On 27/06/2012 12:12, Andreas Hocevar wrote:
I see. So maybe you need to leave the original z assignement as-is
(without Math.round or Math.floor), and only change the lines that say
this.tierSizeInTiles[z]
to something like
this.tierSizeInTiles[z|0]
(z|0 being a more efficient way of saying Math.floor(z)).
Andreas.
On Wed, Jun 27, 2012 at 12:04 PM, David Régade<[email protected]>
wrote:
I tried Math.floor and the problem is the same. I'm not sure the problem
comes from Math.round/floor because with my example, for an integer zoom
value (3 for example), top left displayed tile is 256px width (thanks
firebug). For a 3.4 zoom value should the top left tile image width be
greater than 256px ?
So if the displayed tile images are 256px for 3.4 zoom level, you need
more
tile to cover the layer extent in resolution associated to this zoom
level.
That's why on my axample, when you click on the button the displayed tile
images are not centered as is it should be and another image tile (that
doesn't exist) is required and tried to be drawn. Am I wrong ?
Here is a screenshot of what I observed:
http://david.regade.free.fr/openlayers/z3.4.jpg
Regards
David
On 27/06/2012 11:41, Andreas Hocevar wrote:
Try Math.floor instead of Math.round - currently the client zoom
implementation only supports oversampling, so you need the next
smallest zoom level.
Andreas.
On Wed, Jun 27, 2012 at 10:51 AM, David Régade<[email protected]>
wrote:
Hi,
It can't be so easy. I fixed line 225 with:
var z = Math.round(this.map.getZoom());
And another bug appeared line 201, same fix:
var z = Math.round(this.map.getZoom());
However on this example, http://david.regade.free.fr/openlayers/,
setting
zoom to 3.4 doesn't generate javascript errors anymore but the result
isn't
correct. A tile is tried to be drawn and it shouldn't.
I tried to trace where and why this tile is drawn but I'm to new to
openlayers to find where the problem comes from.
Regards
David
On 27/06/2012 08:05, Andreas Hocevar wrote:
I just see that there is a bug in Zoomify.js, line 225:
var z = this.map.getZoom();
We need the integer of getZoom() here instead.
Maybe you want to send a pull request with a fix?
Andreas.
On Tue, Jun 26, 2012 at 11:33 PM, David Régade<[email protected]>
wrote:
I get the last OpenLayers master and this feature doesn't work with
the
following example:
http://david.regade.free.fr/openlayers/
Is there something I'm doing wrong ?
When setting up a fractional zoom (by clicking on the button for
example)
Firebug catches an error.
Layer is resized but the tiles are not set correctly.
David
On 26/06/2012 16:32, Andreas Hocevar wrote:
This is supported in OpenLayers master and the upcoming 2.12
release.
Andreas.
On Tue, Jun 26, 2012 at 3:12 PM, David Régade<[email protected]>
wrote:
Hi,
We use openlayers to display large panoramas. We use ZoomifyImage
to
split
original image in tiles and Zoomify layer to display these tiles.
I would like to use fractionalZoom with Zoomify layer but this
layer
doesn't
support this feature. The main goal is to able to resize displayed
tiles
for
zoom level 3 from 2.5 to 3.4.
Does anyone knows how to do that ?
Thanks in advance
--
David REGADE
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