Offset uniqueness in vector of ColorSteps

[Armin Le Grand]

Hi Regina & Michael,

On 3/15/23 16:24, Regina Henschel wrote:
> Hi Armin, hi Michael,
>
> Michael, I have put you an CC, because this is about ODF. Do you 
> prefer one of the ideas (A)(B)(C)(D) or have a better idea?
Yes, pls add your 2ct.
>
> (D)
> Add
>     <rng:zeroOrMore>
>         <rng:ref name="svg-stop"/>
>     </rng:zeroOrMore>
> as child elements to <draw:gradient>
> Add that in case <svg:stop> child elements exist, draw:start-color 
> together with draw:start-intensity is treated as being a <svg:stop> 
> element with svg:offset="0%" and svg:opacity="1" before all given 
> <svg:stop> elements,
> and draw:end-color together with draw:end-intensity is treated as 
> being a svg:stop element with svg:offset="100%" and svg:opacity="1" 
> after all given <svg:stop> elements,
> and draw:gradient-step-count is treated as "0".
> Specify that the rules in 13.2.4 SVG 1.1. ... shall be followed.
Thanks, that looks good to me, see below.
>
>>>> I would take out from this the StartColor (AKA offset == 0.0) and 
>>>> the EndColor (AKA offset == 1.0), so in the normal case there would 
>>>> be no change at all. >
>>>> If there are ColorSteps with offset != 0.0 or 1.0 I would create 
>>>> that extra-entries for these.
>>>
>>> What do you mean by "take out"?
>>
>>
>> Just that for 0% I would use our draw:start-color and for 100% our 
>> draw:end-color. I would only write new entries in svg-conform 
>> semantic for offsets ]0%..100%[. This is to stay as compatible as 
>> possible. It also makes no sense to 'double' the information with 
>> having the same color represented e.g. for StartColor once as 
>> draw:start-color and once as <stop offset="0%"/>.
>
> I think, that would be like I have described as way (D).
Yes, I agree and that's what I would suggest to do for now. It stays as 
compatible as possible and the incremental 'bigger' solutions will be 
possible based on that AFAICT.
>
>
> Because the introduction of theme colors, it might be needed to extend 
> <svg:stop> to not only have stop-color attribute in the sense of SVG 
> but allow a reference to a scheme-color in addition. In case of (D) 
> that would have to be added for start- and end-color too.
Will think about that, too...
>
> Kind regards,
> Regina

Regards,
     Armin

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