https://bugs.documentfoundation.org/show_bug.cgi?id=96871
Bug ID: 96871
Summary: Log Y axis auto scale should not expand to B^0
Product: LibreOffice
Version: Inherited From OOo
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Chart
Assignee: [email protected]
Reporter: [email protected]
Created attachment 121693
--> https://bugs.documentfoundation.org/attachment.cgi?id=121693&action=edit
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
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