Bug report #1344

Zooming to a very small area causes a long freeze

Added by Håvard Tveite almost 15 years ago. Updated about 14 years ago.

Assignee:nobody -
Affected QGIS version: Regression?:No
Operating System:Windows Easy fix?:No
Pull Request or Patch supplied: Resolution:fixed
Crashes QGIS or corrupts data: Copied to github as #:11404


I have a PostGIS layer (municipality polygons). I experience a several minutes long freeze (with high CPU) when I zoom to a small area (scales larger than about 1:2000). No problem for smaller map scales (larger zoom windows). The extent of the dataset is about 3000 km N-S and 1000 km E-W.
Quantum GIS Kore 1.0.0 preview1, code revision 9407 on MS Windows NT.


#1 Updated by Håvard Tveite almost 15 years ago

I am very sorry that the title turned out to be wrong on this bug report. I was in the middle of exploring the bug when I made the title, and after experimenting a bit, I found out that the "bug" was only scale dependent.

Is it possible for someone to change the title to:
"Zooming to a very small area causes a long freeze" ?

#2 Updated by Magnus Homann almost 15 years ago

Are there any rasters loaded?

#3 Updated by Håvard Tveite almost 15 years ago

No rasters were involved at the time I was zooming in and out (I don't recall if any rasters were loaded earlier in the session - in case, it would have had to be a WMS layer).
I tested again today (with the same version of QGIS). This time, I saw no such delays as those I had experienced the last time. Everything ran smoothly and fast.
I must have experienced something that shows up after a while... - I was testing the software, so I don't recall exactly what I did before I experienced the zoom delays.

#4 Updated by zachariahyoder - almost 15 years ago

I think this is related to #1311, to which I have just posted an example of how to reproduce the error.

#5 Updated by Giovanni Manghi about 14 years ago

I tested this report with Qgis 1.2 (rev. 10972M) installed from OSGeo4W under windows XP Professional, and I cannot replicate it.

Used a polygon postgis layer, with other layer loaded from wms/wfs, and tried to zoom to very small areas. Rendering seems to me slower on windows rather than on linux, but I experienced no unacceptable delays or freezes.

If none will reply in the next days I'll close this.

#6 Updated by Giovanni Manghi about 14 years ago

  • Resolution set to fixed
  • Status changed from Open to Closed

Closing this ticket. Reopen if necessary.

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