Bug 96871 - Log Y axis auto scale should not expand to B^0
Log Y axis auto scale should not expand to B^0
 Status: RESOLVED FIXED None LibreOffice Unclassified Chart (show other bugs) Inherited From OOo All All medium minor Laurent Balland target:5.2.0

 Reported: 2016-01-03 12:22 UTC by Laurent Balland 2016-10-25 19:08 UTC (History) 2 users (show) h3734236 ilmari.lauhakangas

Attachments
XY chart with Y-axis auto log scale (19.29 KB, application/vnd.oasis.opendocument.spreadsheet)
2016-01-03 12:22 UTC, Laurent Balland
Details

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 Laurent Balland 2016-01-03 12:22:34 UTC ```Created attachment 121693 [details] XY chart with Y-axis auto log scale Description: ScaleAutomatism::calculateExplicitIncrementAndScaleForLogarithmic function expands Y-axis auto log scale to B^0 (=1) in almost all cases. On a log scale, "1" has no special meaning: it is not the origin, like "0" is on a linear scale. See http://opengrok.libreoffice.org/xref/core/chart2/source/view/axes/ScaleAutomatism.cxx#calculateExplicitIncrementAndScaleForLogarithmic step 2, more specifically http://opengrok.libreoffice.org/xref/core/chart2/source/view/axes/ScaleAutomatism.cxx#362 /* If minimum is less than 5 (i.e. original source values less than B^5, B being the base of the scaling), or if minimum and maximum are in different increment intervals (means, if minimum and maximum are not both in the range [B^n,B^(n+1)] for a whole number n), set minimum to 0, which results in B^0=1 on the axis. */ Steps to reproduce: 1. Create XY data with Y values between 10^4 and 10^6 2. Create XY chart with Y-axis auto log scale or open attached document Actual behavior: Y-axis starts from 1, which creates an empty space between 1 and 10^4, that is 2/3 of chart area. Expected behavior: Y-axis should start from 10^4``` Buovjaga 2016-01-04 13:34:04 UTC ```Confirmed with attached document. Win 7 Pro 64-bit Version: 5.2.0.0.alpha0+ Build ID: b4082bed2de12cd576a06a9f456a71101809f3ed CPU Threads: 4; OS Version: Windows 6.1; UI Render: default; TinderBox: Win-x86@62-merge-TDF, Branch:MASTER, Time: 2016-01-02_00:47:38 Locale: fi-FI (fi_FI)``` Commit Notification 2016-04-06 14:26:27 UTC ```Laurent Balland-Poirier committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=45f683a495411af8e059527c137af335ade79c37 tdf#96871 Do not force auto log Y scale to B^0 It will be available in 5.2.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.```