[OASIS Issue Tracker] Commented: (OFFICE-2872) 20.24chart:interpolation - definitions of b-spline and cubic-spine seeminsufficient

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    [ http://tools.oasis-open.org/issues/browse/OFFICE-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21309#action_21309 ] 

Andreas Guelzow  commented on OFFICE-2872:
------------------------------------------

It seems that it is the intention to construct the B-splines by just knowing the control points (the data points) and the chart:spline-order. (The chart:spline-resolution should be used in the approximation of the constructed spline by straight line segments as in the cubic spline case.)
That information is really not enough unless we are also specifying what special kind of knot vector we want to use. 

I suspect that the chart:spline-order is really the degree of the B-spline (no polynomials involved!) and we are specifically requesting uniform B-splines.  

> 20.24 chart:interpolation - definitions of b-spline and cubic-spine seem insufficient
> -------------------------------------------------------------------------------------
>
>                 Key: OFFICE-2872
>                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-2872
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: Bug
>          Components: Chart
>    Affects Versions: ODF 1.2 CD 05
>            Reporter: Patrick Durusau
>             Fix For: ODF 1.2 CD 06
>
>
> 20.24 chart:interpolation - definitions of b-spline and cubic-spine seem insufficient
> Read in full:
> "b-spline - B-Splines. The chart:spline-order attribute specifies the order of the polynomials used for calculation. 20.48 The chart:spline-resolution attribute specifies the number of interpolated points between two data points. 20.49
> cubic-spline - Cubic Splines. The chart:spline-resolution attribute specifies the number of interpolated points between two data points. 20.49"
> Ok as far as it goes but doesn't tell me anything about b-spline and cubic-spine. 
> In fact, simply repeats information already present elsewhere.
> Suggest deleting the definitions as written and supplying definitions for these attributes. 
> There is an implied statement of polynomials somewhere but it isn't clear where from this entry. 

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