Bug 126100 - Arc with concave arrow has rendering error in certain configurations and arrow angles
Summary: Arc with concave arrow has rendering error in certain configurations and arro...
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: LibreOffice (show other bugs)
(earliest affected)
Inherited From OOo
Hardware: All Windows (All)
: low minor
Assignee: Not Assigned
Depends on:
Blocks: Shapes Arrow_Style
  Show dependency treegraph
Reported: 2019-06-26 06:04 UTC by Buovjaga
Modified: 2024-04-13 03:14 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:

Arc with arrow (23.48 KB, image/png)
2019-06-26 06:04 UTC, Buovjaga
Example ODG (8.86 KB, application/vnd.oasis.opendocument.graphics)
2019-06-26 06:04 UTC, Buovjaga
video shwoing the bug in some conditions (1.76 MB, video/mp4)
2019-06-26 19:27 UTC, BogdanB

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Description Buovjaga 2019-06-26 06:04:24 UTC
Created attachment 152405 [details]
Arc with arrow

1. Open Draw
2. Pick the Arc tool (from the Insert Basic Shapes button in Drawing toolbar)
3. Draw an arc
4. Right-click the arc, Line
5. Width 0,10 cm, arrow end style: Arrow concave, OK

The rendering error is present both with and without OpenGL, but the appearance is different (see screenshot).

Not seen in 4.3.0.

I will bibisect this later.

Version: (x64)
Build ID: 9a2fbfa3cc1da8bd9388d5b4c780e86f0dccc791
CPU threads: 4; OS: Windows 10.0; UI render: GL; VCL: win; 
TinderBox: Win-x86_64@42, Branch:master, Time: 2019-06-25_23:12:21
Locale: fi-FI (fi_FI); UI-Language: en-US
Calc: threaded
Comment 1 Buovjaga 2019-06-26 06:04:43 UTC
Created attachment 152406 [details]
Example ODG
Comment 2 Buovjaga 2019-06-26 06:20:53 UTC
This is only seen with the default arrow width. If it is changed from 0,35 cm to 0,3 or 0,4 there is no error.
Comment 3 Buovjaga 2019-06-26 16:39:05 UTC
Weird, now I cannot repro this from scratch on another machine. The example file looks bad even in 3.5.0 :(
Maybe somehow a combination of the shape size and arc angle?
Comment 4 BogdanB 2019-06-26 19:27:10 UTC
It's something like an pac-man between arrow and line...
A little circle... Maybe it's a wrong formula when the arrow meet the line...
See the video with some tests...

Build ID: a187af327633f5f00363be5131bd21a13e0f1a7b
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3; 
Locale: ro-RO (ro_RO.UTF-8); UI-Language: en-US
Calc: threaded
Comment 5 BogdanB 2019-06-26 19:27:36 UTC
Created attachment 152432 [details]
video shwoing the bug in some conditions
Comment 6 Buovjaga 2019-06-28 18:40:22 UTC
Thanks for the vid. I also found a good way to tease out the rendering error: grab a corner scaling handle and start moving it around. This combined with dashed style made (some version of) the error appear even in version 3.3.0 and 3.5.0.
Comment 7 QA Administrators 2021-06-28 03:48:17 UTC Comment hidden (obsolete)
Comment 8 QA Administrators 2024-04-13 03:14:59 UTC
Dear Buovjaga,

To make sure we're focusing on the bugs that affect our users today, LibreOffice QA is asking bug reporters and confirmers to retest open, confirmed bugs which have not been touched for over a year.

There have been thousands of bug fixes and commits since anyone checked on this bug report. During that time, it's possible that the bug has been fixed, or the details of the problem have changed. We'd really appreciate your help in getting confirmation that the bug is still present.

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