Hi,
checked that ODF1.2 has svg:linearGradient (16.40.2) and
svg:radialGradient (16.40.3) with all needed child elements, so this
would work.
Also checked that draw:gradient (16.40.1) has only the known elements
for the current gradients - thus enhancing the current ones with adding
multistop colors seems difficult, hmmm.
Next question is how to use these backwards-compatible - need to think
about this, but the gradient itself is identified using an ID-String
(aka 'Name') in the file format, so we could e.g. have a current and a
svg one with the same name, prefer the svg one. In that way the older
offices would - at least - load a two-color gradient which hopefully
looks somewhat similar...
Anyways, SVG and current ones will geometrically look different, also
only two types in svg. This means we need somewhere new UI and
Interactions (did I mention that we have interactive controls in the
EditView to edit the current gradients?) and probably more (adapt to
other FileFormats...)
Just my 2ct...
Regards,
ALG
Am 10.09.2016 um 11:11 schrieb Heiko Tietze:
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.
--
--
ALG (PGP Key: EE1C 4B3F E751 D8BC C485 DEC1 3C59 F953 D81C F4A2)
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