Re: [office] chart:interpolation

[Patrick Durusau <patrick@durusau.net>]

Andreas,

On 11/03/2011 04:36 PM, Andreas J. Guelzow wrote:

<snip>

> I wasn't as confused as I thought.

That's always a comfort. ;-)

> A small bug in the current
> development version of Gnumeric hid some of the interpolation methods
> implemented there.
>
> So I will be proposing a few more methods:
>
>   * Cubic spline interpolation with parabolic limits.
>   * Cubic spline interpolation with cubic limits.
>   * Cubic spline interpolation with fixed derivatives at both ends.
>
> Rather than adding more attribute values to the chart:interpolation
> attribute, I believe it would be cleaner (and more in the spirit of the
> already existing chart:spline-* attribute) to use secondary attributes
> chart:spline-limits, chart:spline-limits-start, chart:spline-limits-end
> that would modify the cubic-spline interpolation already provided in ODF
> 1.2.

To confirm before you enter them in JIRA:

chart:spline-limits

chart:spline-limits-start

chart:spline-limits-end

Valuetype = ?

What do we have to reference in current 20:26? (I know it is probably 
obvious but we should not simply say: apply to 20:26 as appropriate.)

On prose for these attributes, let's avoid:

> 20.51 If the chart:spline-resolution attribute has value 1 this
> is identical to the chart:interpolation attribute value none.

That is really awkward and I am not altogether sure it is necessary. 
Unless we mean to bind the value of chart:spline-resolution to 
chart:interpolation? That is if chart:spline-resolution > 1 then 
chart:interpolation *cannot* have the value of none?

> Gnumeric also provides:
> * Closed Bezier cubic spline interpolation.
> Since this is not really a proper "interpolation" method, I am not sure
> this would be appropriately added here unless other implementations
> provided a similarly closed interpolation.

Other implementers? Anyone?

Hope you are having a great day!

Patrick


> Andreas


--
Patrick Durusau
patrick@durusau.net
Chair, V1 - US TAG to JTC 1/SC 34
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