ODF specification regarding multistop/-color gradients

[Heiko Tietze]

So taking all together we have means to save the multistop/multicolor
gradient and we can render it correctly. Sounds great.

The preliminary mockup can be found in
https://design.blog.documentfoundation.org/2015/12/22/area-fill-options-made-consistent.
When the type cannot be chosen freely (in Powerpoint I can define
multistop gradients for radial, linear, rectangular, and path(?)
types) we should still implement it as scribbled in the mockup,
meaning the multistop feature is integrated into the properties
instead of becoming a new type. But when the user defines more than
two stops the type changes to linear and the dropdown will be
disabled.

How to proceed now? Should I file an enhancement ticket?

2016-09-10 15:24 GMT+02:00 Jos van den Oever <jos at vandenoever.info>:
> Hello Heiko,
>
> <svg:linearGradient/> is not a hack. It has been in the ODF specification since
> 1.0.
>
> Cheers,
> Jos
>
>
> On Saturday 10 September 2016 11:11:40 Heiko Tietze wrote:
>> Hello all,
>>
>> the LibreOffice conference gave me the chance to present some ideas
>> regarding Draw and shapes in general. One of the most wanted features is
>> the multistop gradient. Today we can define gradients between two colors,
>> either linear, radial, or whatever. It would be nice to have a) non-linear
>> multistop gradients, for example to illustrate a sundown with a small red
>> and a larger yellow section, and b) a gradient over more than two colors,
>> e.g. in order to add blue sky to the sundown.
>>
>> Since Calligra offers multicolor gradients, Armin and me checked how it is
>> saved (the rendering is build-in right now). And it turns out that they
>> hack SVG into the ODF. For the (predefined) rainbow-like gradient the
>> style.xml looks like this:
>>
>> <svg:linearGradient draw:name="gradient1" svg:spreadMethod="pad"
>> svg:x1="0.000000%" svg:x2="100.000000%" svg:y1="0.000000%"
>> svg:y2="100.000000%"> <svg:stop svg:offset="0"
>> svg:stop-color="#ff0000"/><svg:stop svg:offset="0.183575"
>> svg:stop-color="#ffe100"/><svg:stop svg:offset="0.347826"
>> svg:stop-color="#00ff00"/><svg:stop svg:offset="0.516908"
>> svg:stop-color="#00ffff"/><svg:stop svg:offset="0.68599"
>> svg:stop-color="#0000ff"/><svg:stop svg:offset="0.845411"
>> svg:stop-color="#ff00fb"/><svg:stop svg:offset="1"
>> svg:stop-color="#ff0004"/> </svg:linearGradient>
>>
>> As an UX evangelist I don't care too much about the implementation and have
>> rather the workflow and interactions in mind. Ideally the multi-gradient
>> works with all features, and not as another type next to linear, radial
>> etc. (There might be a problem that result in this sub-optimal solution).
>>
>> And finally we have to take interoperability into account as well as the
>> conformity to the ODF specs (no idea if and how it is defined).
>>
>> So how do we make multistop/multicolor gradients possible?
>>
>> Cheers,
>> Heiko
>>
>> PS: Suggestions on how to implement this feature in the UI are existing.
>