[Libreoffice-bugs] [Bug 115464] UI of export to PNG and JPG misleading for resolution

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=115464

--- Comment #19 from Regina Henschel <rb.henschel at t-online.de> ---
(In reply to Tomaz Vajngerl from comment #17)
> I still don't understand why we need to "lock" something. All three
> parameters are changeable, they just depend on each other.

There exists three situations:
Change widht/height length and change DPI => Pixels are calculated
Change width/height in pixels and change DPI => width/height length is
calculated
Change width/height in pixels and change width/height length => DPI is
calculated

So if the user changes e.g. width/height length, you cannot change DPI or
pixels automatically, because there are two situations in which a length change
are possible. Locking one of them makes it possible to calculate the other.

(In reply to Heiko Tietze from comment #16)
> Different units are available right now via dropdown.
You cannot offer pixel as length in this context. Because here 'pixel' do not
mean a length unit, but reflects the number of color items. Only with the
additional information of DPI you get a length from it. That is different from
e.g. CSS.

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