Bug report #4324
wrong scale in print composer?
|Affected QGIS version:||master||Regression?:||No|
|Operating System:||Windows||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||worksforme|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||14261|
using the print composer there are sometimes sudden scale changes within a map window. They appear in raster layers (aerial imagery) and vector shape layer (parcel boundaries). Details are visible in the desktop segment of the program interface and in the resulting generated print. See figures scale_dependent_shift1.png and scale_dependent_shift2.tif.
What could be the reason for it?
Thanks a lot
#1 Updated by Bill Williamson over 8 years ago
there was a ticket a while back lodged by Nathan which was consistent with my experience, there was an offset problem when generating pdf maps directly out of composer. We found that printing to an installed pdf printer did not have the problem. I can't find the old ticket and presume there has been some fix, but perhaps the same territory as your problem.
I don't fully understand your example (I see aproblem but the blue arrow points to ? and I don't read German)
Any more detail from your end?
#9 Updated by Thaddeus - over 6 years ago
- Status changed from Closed to Reopened
I just came across this erratic behavior of the scale on the Map object of the Composer: after reopening the QGS file, the scale edit box shows a different number (from 240 to 244) and features on the Map object are off the original place.
Also, when manually setting the Map Extents and switching to the Map tab and back to Map Extents, the map corners are rounded off to slightly different numbers, eg, from -7073732.123 to -7073732.118.
Tried this on QGIS 1.8 and 2.0 on Linux and also on MSWin with same results.
My 2 cents:
The ComposerMap entry on the main XML file is saving the map corners in scientific notation rounding off the number to the closets 10m number: it's using only 5 decimal places.
On my test, the CRS is a Modified Mercator (900913) that needs numbers as large as 26706198.518000 meters.
<Composer title="Composer 5" visible="1">
<ComposerMap ... >
<Extent ymin="5.56758e+06" xmin="-7.07373e+06" ymax="5.56764e+06" xmax="-7.07363e+06"/>