Problems with import of shape type 'arc' from binary MS Office

[Mark Hung]

Hi Regina,

In your first mail you mentioned that MSO has viewbox size 43200x43200,
while LibreOffice has viewbox size 21600x21600.
And MSO viewbox only contains the current sector but LibreOffice contains
the eclipse.

I think it's correct that you want to make LibreOffice viewbox only contain
the current sector. But I think the problem is caused by incorrect
conversion of the draw:enhanced-path (see the content.xml in saved odt
file) instead of the incorrect viewbox size. I think it's important to find
out why it failed to convert the enhanced-path so that it only contains the
sector.

Although changing the viewbox size might have the expected effect for the
arc shape msoSptArc, but I don't understand why it works and we might also
miss the chance to fix the conversion of problematic drawing commands for
other custom shapes.




Regina Henschel <rb.henschel at t-online.de> 於 2019年3月13日 週三 上午2:22寫道：

> Hi Mark,
>
> Mark Hung schrieb am 12-Mar-19 um 15:59:
> >
> >
> > Regina Henschel <rb.henschel at t-online.de
> > <mailto:rb.henschel at t-online.de>> 於 2019年3月11日 週一 上午6:11寫道：
> >
> >     Hi all,
> >
> >     It is not possible to change the outer position to set the sector to
> >     the
> >     original position, because that might result in positions outside the
> >     page. But that is not possible for text documents.
> >
> >     I consider to change the import so, that the viewbox only includes
> the
> >     current sector not the entire ellipse. What do you think?
> >
> >
> > I wonder why this is necessary if both MSO and LibreOffice interpret the
> > viewbox and arc command the same way.
>
> But they have different size and position of the viewbox. I have written
> https://bugs.documentfoundation.org/show_bug.cgi?id=124029. It has a
> document attached, where you can see the problem.
>
>   If they don't, I'd consider to
> > scale the parameters of the arc command because other command might rely
> > on the viewbox.
>
> It is only about the shape 'arc'. I do not see the problem for other
> shape types. The 'arc' has a special treating anyway, see
> msdffimpl.cxx#4513. Setting a special viewbox for the 'arc' shape would
> have no effect on other shapes.
>
> There would be a difference for the user. If he changed the angle of the
> arc, he would notice, that the adjustment handles leave the rectangle of
> the resize handles and the sector might be partly outside the rectangle
> of the resize handles.
>
>   Or maybe the view port were set to 0,0,0,0 as in
> > tdf#76334? I saw pptx always import the viewbox as 0,0,0,0, and there
> > are treatment that I felt that might be wrong.
>
> That is in the OOXML import filter and not affected here. The treating
> there is wrong, but it is a different problem.
>
> Kind regards
> Regina
>
>
>
>

-- 
Mark Hung
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