Issue 72218

Summary: new chart: handling of B-splines is obscure
Product: General Reporter: Regina Henschel <rb.henschel>
Component: chartAssignee: AOO issues mailing list <issues>
Status: CONFIRMED --- QA Contact:
Severity: Trivial    
Priority: P4 CC: IngridvdM, issues, tony.galmiche.ooo
Version: 3.3.0 or older (OOo)   
Target Milestone: ---   
Hardware: PC   
OS: Windows XP   
Issue Type: ENHANCEMENT Latest Confirmation in: ---
Developer Difficulty: ---

Description Regina Henschel 2006-12-02 23:46:50 UTC
You have subordered the B-spline variant under "smooth". I think, that is not
correct. If you draw a B-spline, your data points are not points on the curve,
but they are used as control points to form the B-spline curve. So a B-spline
curve is more like a Bézier curve. It is complete different from smoothing a
line with interpolation like in the case of cubic splines, which goes through
the data points.

People who know nothing about B-splines will be confused, what will become out
of there polyline. Those who know, what a B-spline curve is, will be confused to
find them as variant of a polyline.

The resolution of the cubic spline divides the interval between neighbour points
and you get different length, if the distance between the points are different.
For B-splines the whole range from first to last point is divided in equal
distances.

Therefore B-Spline curves are so much different from cubic splines that they
should get an icon beside the polyline variants and get a handling for them alone.
Comment 1 kla 2006-12-04 14:42:02 UTC
@IHA: Pls have a look.
Comment 2 IngridvdM 2006-12-04 15:00:24 UTC
Thanks. Yes I think we should consider to change this.
Comment 3 IngridvdM 2006-12-11 16:24:05 UTC
@ Matthias: Please take over for discussion and decision. Thanks Ingrid.
Comment 4 matthias.mueller-prove 2009-09-06 11:02:01 UTC
I am no longer officially active on OOo. Please take over.