Issue 72218 - new chart: handling of B-splines is obscure
Summary: new chart: handling of B-splines is obscure
Alias: None
Product: General
Classification: Code
Component: chart (show other issues)
Version: 3.3.0 or older (OOo)
Hardware: PC Windows XP
: P4 Trivial (vote)
Target Milestone: ---
Assignee: AOO issues mailing list
QA Contact:
Depends on:
Reported: 2006-12-02 23:46 UTC by Regina Henschel
Modified: 2013-02-24 21:21 UTC (History)
3 users (show)

See Also:
Latest Confirmation in: ---
Developer Difficulty: ---


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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

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.