Issue 109228 - Scatter type chart line is messed up if the lines are smoothed
Summary: Scatter type chart line is messed up if the lines are smoothed
Status: CLOSED DUPLICATE of issue 48012
Alias: None
Product: Calc
Classification: Application
Component: code (show other issues)
Version: OOO320m12
Hardware: PC Linux, all
: P3 Trivial (vote)
Target Milestone: ---
Assignee: spreadsheet
QA Contact: issues@sc
URL:
Keywords: oooqa
Depends on:
Blocks:
 
Reported: 2010-02-13 15:32 UTC by spicausis
Modified: 2010-02-17 23:05 UTC (History)
2 users (show)

See Also:
Issue Type: DEFECT
Latest Confirmation in: ---
Developer Difficulty: ---

Attachments
Image showing the bug (61.93 KB, text/plain)
2010-02-13 15:32 UTC, spicausis 		no flags Details
ODS showing the issue (14.12 KB, text/plain)
2010-02-13 15:33 UTC, spicausis 		no flags Details
Add an attachment (proposed patch, testcase, etc.)

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Description spicausis 2010-02-13 15:32:00 UTC 
As this bug tracker doesn't seem to support the attachments (no, really, wtf), 
see the example ods and png image here:

http://bugpipe.org/bugs/oo-scatter-smooth/

and notice the hook on the graph, that most definitely should not be there.
Comment 1 spicausis 2010-02-13 15:32:55 UTC 
Created attachment 67805 [details]
Image showing the bug
Comment 2 spicausis 2010-02-13 15:33:20 UTC 
Created attachment 67806 [details]
ODS showing the issue
Comment 3 spicausis 2010-02-13 15:35:43 UTC 
(oh, so you CAN attach the files. just after saving. why tell about it, 
because, who would need to know that, anyway?)
Comment 4 Regina Henschel 2010-02-17 23:04:39 UTC 
The hook in the curve is correct for a spline. But it seems, that you do not
expect a spline but an interpolation with a function. Splines in OOo are 2D
curves, so that you can get an oval from some points for example. A spline is
always calculated from all points, so it is global. In your case the first point
influences the whole spline curve and produces this hook.

The way OOo smooths is different from the way Excel does it. In Excel smoothing
is a local property of approximately 4 neighbored points. There is already the
feature request in issue 48012, to implement a similar interpolation in OOo, but
no one has provided a good algorithm till now.

So I will close this issue as duplicate of issue 48012.

*** This issue has been marked as a duplicate of 48012 ***
Comment 5 Regina Henschel 2010-02-17 23:05:19 UTC 
closing, problem is already tracked in issue 48012.