Bug report #12151

composer map item content shifts downwards when zoom level greater than 800%

Added by Mathieu Pellerin - nIRV over 4 years ago. Updated over 4 years ago.

Status:Closed
Priority:Severe/Regression
Assignee:Martin Dobias
Category:Map Composer/Printing
Affected QGIS version:master Regression?:No
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:
Crashes QGIS or corrupts data:No Copied to github as #:20344

Description

Since QGIS 2.6, the content of a map item will incrementally shifts downwards as the zoom level increases when starting at 800%. It effectively prevents using an extreme zoom value to fine-tune the location of a composer element (say an arrow item) and the content of a map item.

Steps to reproduce:
  1. Open an existing QGIS project
  2. Create a composer, or open an existing composer which has a map item
  3. Make sure the map item you'll use is set to "cache"
  4. Set the composer zoom level to 800%, pan the composer sheet so the map item's content is visible, and hit the map item's "Update preview" button
  5. Set the composer zoom level to 825%, and hit the map item's "Update preview" button again
  6. You'll notice the map item's content begins to shift downwards
  7. Repeat the operation with zoom levels 850%, 875%, 900%, etc. to see the map item's content slowly sicking downwards :)

I'm setting this as a blocker, Nyall, feel free to downgrade if you think it shouldn't be set to such a high priority.

800_percent.jpg (112 KB) Mathieu Pellerin - nIRV, 2015-02-08 02:54 AM

825_percent.jpg (113 KB) Mathieu Pellerin - nIRV, 2015-02-08 02:54 AM

875_percent.jpg (111 KB) Mathieu Pellerin - nIRV, 2015-02-08 02:54 AM

Associated revisions

Revision 70a0a6e3
Added by Martin Dobias over 4 years ago

Fix #12151 - fix cached composer map image when zoomed in a lot

The map was being rendered with wrong parameters when width or height
exceeded 5000 pixels.

History

#1 Updated by Mathieu Pellerin - nIRV over 4 years ago

Adding screenshots that shows the issue; check the rulers to take note of the content shift.

#2 Updated by Martin Dobias over 4 years ago

  • Assignee changed from Nyall Dawson to Martin Dobias

#3 Updated by Martin Dobias over 4 years ago

  • Status changed from Open to Closed

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