Bug report #6200

Label direction does not take scale-dependent average to determin line orientation

Added by Robin Lovelace almost 12 years ago. Updated about 5 years ago.

Affected QGIS version:master Regression?:No
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:end of life
Crashes QGIS or corrupts data:No Copied to github as #:15514


This is a simple problem.

The new label interface in QGIS 1.9.0 is excellent and dynamic labelling capabilities impressive.
However, label orientation is not good for wiggly lines like rivers.
When zoomed out, the labels rarely follow the large-scale direction of the river.
Instead, the orientation seems to follow individual (small scale) segments, which leads to labels being 90 degrees rotated from their ideal alignment.

See images and sample river label project (attached).

Perhaps solution could build on this bug fix: https://issues.qgis.org/projects/quantum-gis/repository/revisions/b77d606744ec3721ba15366ff754fcbce0a265d7 .

gis-projects.zip - project file and data illustrating problem (UK) (517 KB) Robin Lovelace, 2012-08-15 03:40 PM

90-degrees-labels.jpeg - incorrect allignment (95.9 KB) Robin Lovelace, 2012-08-15 03:40 PM

compressed-river-labels.jpeg - compressed labels (41.4 KB) Robin Lovelace, 2012-08-15 03:40 PM


#1 Updated by Martin Dobias almost 12 years ago

  • Assignee deleted (Martin Dobias)

This would be most likely fixed with introduction of on-the-fly simplification in the labeling engine. The simplification would also help to resolve #2113.

#2 Updated by Giovanni Manghi almost 12 years ago

  • OS version deleted (12.04 64 bit)
  • Operating System deleted (Ubuntu)

#3 Updated by Jürgen Fischer almost 10 years ago

  • Target version changed from Version 2.0.0 to Future Release - Lower Priority

#4 Updated by Giovanni Manghi about 7 years ago

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

#5 Updated by Giovanni Manghi about 5 years ago

  • Resolution set to end of life
  • Status changed from Open to Closed

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