[Qgis-user] wrong scale printing with qgis web client

[Tom Palan]

hi,

I had the same problem when printing from QGIS Webclient. It happens when projection is set to EPSG3857 for using Google,OSM,...basemaps, and your data is in another projection.
At least for me the window-size of the print bounding box (when you're selecting the print) was wrong, and I patched GeoExt to make it behave correctly.
I think the error/bug/misconception is in the webclient and not in QGIS itself.

The problem is: when you have a print-layout with a width of e.g. 210mm this converts at a scale of x to a bounding-box of y meters. The value of y is different in EPSG:3857 and the "real" projection, and therefore the bounding-box is not displayed correctly.

If you want to have further info on the GeoExt patch, I can send it to you in a few days. It is not a pretty hack!
Maybe someone with more experience can chime in.

greetings
Tom

On Wed, Dec 02, 2015 at 11:54:13AM +0100, Enrico Ferreguti wrote:
> Hi,
> I'm getting prints with wrong scale from qgis web client.
> Apparently everything is fine, I select the layout, the scale from the
> select box, I place the bounding box in the map and then I print. The
> layout contains a numeric scalebar that correclty reports the selected
> scale but if I manually measure on paper the printed image appears that the
> map has a wrong scale by a 1.43x factor
> 
> I verified the behaviour with different projects and projections on various
> servers.
> 
> Should I open a ticket or Am I doing something wrong?
> 
> Attached there is a print with wrong graphical and numeric scalebars.
> The location is the following:
> http://www.openstreetmap.org/#map=19/45.3963826129/11.8795777003
> 
> Regards.
> Enrico Ferreguti


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Tom Palan
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