Bug report #15296
Curved labels not showing when 'Merge connected lines' is on
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: | - | ||
| Category: | Unknown | ||
| Affected QGIS version: | 2.16.0 | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | No | Resolution: | |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 23230 |
Description
When I switch 'Merge connected lines' on, I do not expect less distinct labels. In the screenshots look at 'Vengraven', 'Mertenshof' and 'Geertshof'.
I did some testing (see attached text file) and it appears that the merged lines are shorter than the sum of the parts. More specifically, it appears that the last line segment is not accounted for.
1_separate_lines.png (128 KB)
2_merged_lines.png (120 KB)
3_merged_lines_discourage_off.png (120 KB)
Merge_lines_problem.txt 
(2.16 KB)
2016-07-20_06_48_04-QGIS_fd88d91_-_Top10NL.png (142 KB)
2016-07-20_06_48_41-Calculator.png (134 KB)
History
#1
Updated by Frits van Veen about 8 years ago
- File 1_separate_lines.png added
- File 2_merged_lines.png added
- File 3_merged_lines_discourage_off.png added
- File Merge_lines_problem.txt added
#2
Updated by Frits van Veen about 8 years ago
Unchecking 'Discourage labels from covering features' does not change much.
#3
Updated by Nyall Dawson about 8 years ago
Can you turn on the "show label candidates" option (under global label properties - the "arrow" button in the top right of the label settings) and attach screenshots?
#4
Updated by Frits van Veen about 8 years ago
- File 2016-07-20_06_48_04-QGIS_fd88d91_-_Top10NL.png added
- File 2016-07-20_06_48_41-Calculator.png added
Don't know if the screenshots help.
I do come at line 1472 in feature.cpp. Function FeaturePart::mergeWithFeaturePart where the comment says:
// sometimes it's not possible to merge lines (e.g. they don't touch at endpoints)
I don't know why this happens, but when it does, the behaviour should be to abandon the merge completely and not to leave a potentially large segment out.
I will look further into it. For now I'm going to enjoy a spell of nice weather we have here in Holland!
#5
Updated by Nyall Dawson about 8 years ago
- Status changed from Open to Feedback
Have a look if 9007d5c has improved this for you...
#6
Updated by Frits van Veen about 8 years ago
- Status changed from Feedback to Closed
Problem solved by 9007d5c
#7
Updated by Jürgen Fischer almost 7 years ago
- Category set to Unknown