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.
step 2, more specifically
/* 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
Y-axis starts from 1, which creates an empty space between 1 and 10^4, that is 2/3 of chart area.
Y-axis should start from 10^4
Confirmed with attached document.
Win 7 Pro 64-bit Version: 220.127.116.11.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)
Laurent Balland-Poirier committed a patch related to this issue.
It has been pushed to "master":
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:
Affected users are encouraged to test the fix and report feedback.