New feature in Calc: Stepped Lines graphs

[Regina Henschel]

Hi Michael, hi Eric,

Michael Stahl schrieb:
> On 20/02/13 22:11, Eric Seynaeve wrote:
>> On Wednesday 20 February 2013 11:09:06 Regina Henschel wrote:
>
>>> The specification is not written in a way, that some people image cool
>>> new features, but they look, what existing programs do. And those things
>>> which are common are standardized. Therefore LO has "ODF1.2 extended"
>>> and Gnumeric "with foreign elements".
>>
>> Regina, I looked at the xml in Gnumeric.
>>
>> It indicates it as follows:
>>
>> <style:style ...>
>> <style:chart-properties chart:interpolation="gnm:step-end".../>
>> </style:style>
>>
>> I guess the 'gnm:step-end' is a foreign element/attribute. Should I
>> implement something similar for LO ? If yes, what to use instead of
>> "gnm:". If no, can you point me in the right direction.
>
> if what you implement has the same semantics as what Gnumeric does (and
> i think that's your goal) then it does make sense to use the same
> foreign elements.
>
> you'd need to add a namespace declaration for the "gnm" prefix; look at
> the xmlns:gnm="..." attribute that must be somewhere in the file (likely
> on the root element).  you can add namespaces in
> xmloff/inc/xmloff/xmlnmspe.hxx and SchXMLExport::SchXMLExport() in
> xmloff/source/chart/SchXMLExport.cxx.


I'm not sure whether the namespace it necessary for an attribute 
_value_. Currently the attribute "chart:interpolation" allows only the 
values none, cubic-spline and b-spline. Gnumeric does not introduce a 
new attribute or element, but a new value for the attribute.

I'm not sure whether the way Gnumeric does it, is grammatically correct. 
Perhaps it is necessary to make an own attribute 
"LOchart:interpolation", which then allows more values. Thorsten might 
know it, and you should ask him.

Kind regards
Regina