hi,
included you find my patch...It is very specific to my application (using
EPSG:31225 austrian projection, and a reference point in the middle of Austria).
I works like this:
- I choose a point of reference (in EPSG:31255), and add the width and height
of the needed print bounding-box as a second point.
- then I project both points into EPSG:3857 (using the proj4-library), and
subtract these 2 points to get the widht and height of the resulting
bounding-box.
I have to admin I do not know enough about projections to judge if this could
be made simpler...I think this is just symptom-control, there must be a better
solution to this.
Another downside: I have to use the debug-version of GeoExt and not the single
file version.
Tom
On Thu, Dec 03, 2015 at 12:34:53PM +0100, Enrico Ferreguti wrote:
> Well, I made some checks....
> I verified that, using osm backgound layers, all projects were reprojected
> to epsg:3857 from epsg:3003.
> Setting (in GlobalOptions.js) all background layer to false and authid
> accordingly with project authid (epsg:3003) I verified that I get now right
> scaled maps (the right scaled pdf is attached).
> Then I confirm that the wrong behaviour (as from Tom email)
>
> > happens when projection is set to EPSG3857 for using
> > Google,OSM,...basemaps, and your data is in another projection.
> >
>
> Qgis server version is 2.10 running under ubuntu.
>
> I would suggest Tom to share GeoExt patch!
>
> Regards.
>
> 2015-12-02 12:20 GMT+01:00 Bernhard Ströbl <bernhard.stro...@jena.de>:
>
> > Hi Enrico,
> >
> > the scalebar on the pdf obviously does not fit the numerical scale.
> > Questions:
> > 1) First we have to determine, if a) the numerical scale is wrong but the
> > scalebar is correct or b) vice versa. What happens if you print out the
> > same Layout in the same project from QGIS desktop in scale 1:1000? Does the
> > scalebar fit the numerical scale? Is the displayed map extent the same?
> > 2) What projection(s) do you use?
> > 3) Which version of QGIS server are you running?
> >
> > Bernhard
> >
> >
> > Am 02.12.2015 um 11:54 schrieb Enrico Ferreguti:
> >
> >> 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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> >> Qgis-user@lists.osgeo.org
> >> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user
> >> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
> >>
> >>
> >
> >
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> > database 12658 (20151202) __________
> >
> > The message was checked by ESET Mail Security.
> > http://www.eset.com
> >
> >
> >
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--
Tom Palan
palan3 IT solutions OG
Grillenbergstr. 4
A-4407 Dietach
Tel.: +43 (0) 680 3280940
--- data/PrintPage.js 2015-12-03 14:23:50.750125562 +0100
+++ /home/tom/Downloads/GeoExt/lib/GeoExt/data/PrintPage.js 2015-10-24 17:26:10.938874006 +0200
@@ -308,30 +308,8 @@
var w = size.width / 72 / unitsRatio * s / 2;
var h = size.height / 72 / unitsRatio * s / 2;
- // we have w and h in meters
- // re-project
- var projSrc = "+proj=tmerc +lat_0=0 +lon_0=13.33333333333333 +k=1 +x_0=0 +y_0=-5000000 +ellps=bessel +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 +units=m +no_defs"; // EPSG:31255
- var projDest = 'EPSG:3857';
-
- var p1 = {
- x: 6922,
- y: 316154
- };
-
- var p2 = {
- x: p1.x+w,
- y: p1.y+h
- };
-
-
- p1 = proj4(projSrc,projDest,p1);
- p2 = proj4(projSrc,projDest,p2);
-
- w = p2.x - p1.x;
- h = p2.y - p1.y;
-
return new OpenLayers.Bounds(center.lon - w, center.lat - h,
- center.lon + w, center.lat + h);
+ center.lon + w, center.lat + h);
},
/** private: method[onLayoutChange]
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