Bug 112687 - Presentation annotations are saved with way too many points
Summary: Presentation annotations are saved with way too many points
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
Version:
(earliest affected)
5.1 all versions
Hardware: All All
: low minor
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: Slide-Show
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Reported: 2017-09-27 08:31 UTC by Antonello
Modified: 2019-10-20 10:47 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:

Attachments
Test slide with annotations (27.30 KB, application/vnd.oasis.opendocument.presentation)
2017-09-27 08:33 UTC, Antonello 		Details
Screenshot of the same file (105.10 KB, image/png)
2017-09-27 08:37 UTC, Antonello 		Details
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Description Antonello 2017-09-27 08:31:19 UTC 
Description:
It is actually possible to save annotations made during presentation with the mouse pointer if the option "Mouse painter as pen" (in Slide Show Settings) has been enabled before starting the presentation.

The problem is however that the tool doesn't use the algorithm of the normal hand-writing tool used in slide editing mode: while in editing mode the hand-writing tool saves just a few dots and "builds" Bézier curves, in presentation mode the algorithm just save LOTS of micro points.
You can see an example in the attached screenshot and odp file: the curves in blue has been obtained with the handwriting tool in editing mode, those in red with the "same" (that is not) tool in the presentation mode.
The result is that even with a few annotations, the slides become unresponsive even on modern pc and generate other problems (e.g., annotation saved on the wrong slide)

Steps to Reproduce:
1. In Slide Show Settings choose the option "Mouse painter as pen"
2. Now starts a presentation and make a few annotations
3. Close (or end) the presentation

Actual Results:  
Annotation are now saved (as desired) with the slide but making too many points but are composed of way too many points that make instable LO (i.e., needs to be killed). Annotations may also appear on wrong slides.

Expected Results:
The annotations made during presentation should have used the same algorithm of hand writing during slide edit.


Reproducible: Always

User Profile Reset: No

Additional Info:
A similar bug already exists (https://bugs.documentfoundation.org/show_bug.cgi?id=51928), but it focus on presentation annotations not being saved.
While this one observes that annotations can actually be saved, but the process of creating them is bugged.

There is no easy workaround, so I leave this bug report  as normal.



User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0
Comment 1 Antonello 2017-09-27 08:33:32 UTC 
Created attachment 136561 [details]
Test slide with annotations

In the attachment lines in blue has been obtained using editing-mode hand-writing tool, while lines in red with presentation-mode hand-writing tool.
You can see the differences if you click on them "edit points"
Comment 2 Antonello 2017-09-27 08:37:18 UTC 
Created attachment 136562 [details]
Screenshot of the same file

Screenshot of the same file. I am uploading this, as opening the original file is ok, but as soon you try to do something with the red lines, it may make your pc unresponsive, so opening instead this screenshot is a safer option ;-)
Comment 3 Buovjaga 2017-11-01 16:40:56 UTC 
Repro from scratch.

Arch Linux 64-bit, KDE Plasma 5
Version: 6.0.0.0.alpha1+
Build ID: af318eeb4e23694e17b09b902afb98ddf9da9b7b
CPU threads: 8; OS: Linux 4.13; UI render: default; VCL: kde4; 
Locale: fi-FI (fi_FI.UTF-8); Calc: group
Built on November 1st 2017
Comment 4 Antonello 2018-10-08 07:32:14 UTC 
Hello, I know it's not nice to ping a bug report without bringing any news, but this bug is pretty important for me as it would allow me to use LibreOffice for teaching in distant learning projects, and at the same time it should be fairly simple to solve for someone with knowledge of the internals of LO Draw, as it is a matter of applying an already know algorithm in the context of live slide annotations.

Is there any way I could investigate this bug further or be more precise in its description?
Comment 5 Buovjaga 2018-10-08 12:17:38 UTC 
(In reply to Antonello from comment #4)
> Hello, I know it's not nice to ping a bug report without bringing any news,
> but this bug is pretty important for me as it would allow me to use
> LibreOffice for teaching in distant learning projects, and at the same time
> it should be fairly simple to solve for someone with knowledge of the
> internals of LO Draw, as it is a matter of applying an already know
> algorithm in the context of live slide annotations.
> 
> Is there any way I could investigate this bug further or be more precise in
> its description?

I think the description is clear enough, so the only way you could help is to dig into the code and provide a better algorithm. I don't believe this is a regression, I assume it has always behaved like this.
Comment 6 QA Administrators 2019-10-20 02:33:13 UTC Comment hidden (obsolete)
Comment 7 Antonello 2019-10-20 10:47:19 UTC 
Still present in LO 6.3.2.2