Bug report #11920

Scale inconsistently changes when adjusting map extent

Added by Harry Clarke over 5 years ago. Updated about 2 years ago.

Category:Map Composer/Printing
Affected QGIS version:3.2.1 Regression?:No
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:
Crashes QGIS or corrupts data:No Copied to github as #:20129


Within Print Composer, SCALE changes when changing XMIN or YMIN for a map, which makes it difficult to accurately draw a map. Changing SCALE alters XMIN, XMAX, YMIN and YMAX. Behaviour is inconsistent, as changing YMIN or YMAX does not effect SCALE.

To reproduce the problem, change XMAX either by changing the Item Properties of the map, or by dragging the boundary of the map.

The parameters XMIN, XMAX, YMIN, YMAX, SCALE and the size parameters WDITH and HEIGHT are all entrancingly linked. What is required is the ability to fix some of the parameters, such as XMIN, YMIN and SCALE and let the other parameters adjust accordingly. Ideally the user should be allowed to choose which parameters to fix and which to allow to float.

scale2.PNG (328 KB) Lene Fischer, 2015-01-01 05:44 AM


#1 Updated by Lene Fischer over 5 years ago

I have the same problem.
2 maps in the same size no problem - Change one of the maps and scale change too.
Map 0 is in 1:5000 Map 1 1:5000 (same size) Map 2 1:5100 (Smaller XMIN, XMAX, YMIN and YMAX) I have to change scale from 1:5000 to 1:5100 to fit.
Se attached file
Lene Fischer

#2 Updated by Giovanni Manghi over 3 years ago

  • Easy fix? set to No
  • Regression? set to No

#3 Updated by Harry Clarke about 2 years ago

This issue is still present in QGIS v3.2.1

#4 Updated by Giovanni Manghi about 2 years ago

  • Affected QGIS version changed from 2.6.1 to 3.2.1
  • Description updated (diff)

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