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Subject: [OASIS Issue Tracker] Commented: (OFFICE-2872) NEEDS-DISCUSSION20.24 chart:interpolation - definitions of b-spline and cubic-spine seeminsufficient



    [ http://tools.oasis-open.org/issues/browse/OFFICE-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=21336#action_21336 ] 

Dennis Hamilton commented on OFFICE-2872:
-----------------------------------------

Andreas,

True.  I can't imagine where else control points would come from but in a drawing situation, although they do determine functions, just in an odd way.

I suppose I should stop talking through my hat and look up chart:interpolation.  

OK, did that.  The problem is this applies to <chart:plot-area> and these are drawing properties in some sense.  Although I think you are safe in assuming that this is how points are connected by lines and/or curves.  That is, the lines are interpolated through specified points that are charted values.   Not sure how that applies to a scatter diagram unless it is the through the points about which the scatters occur (from a regression perhaps?)..

Is this how you are viewing this?

> NEEDS-DISCUSSION 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
>            Assignee: Andreas Guelzow 
>             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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