Chart: Y-axis automatic logarithmic scale

[Chris Sherlock]

We have a class called “ScaleAutomism”?!?

Nice catch though. 

Chris

> On 3 Jan 2016, at 11:46 PM, Laurent BP <jumbo4444 at yahoo.fr> wrote:
> 
> Hello,
> 
> In ScaleAutomatism::calculateExplicitIncrementAndScaleForLogarithmic
> function [1], Y-axis automatic logarithmic scale is expand to B^0 (i.e. 1)
> in almost all cases. 
> In step 2, it is said [2]
> /*  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. */
> 
> I do not agree with this comment because on a log scale, "1" has no special
> meaning: it is not the origin, like "0" is on a linear scale. I would
> propose a patch to suppress this part, but there are may be some good
> reasons to expand to 1?
> 
> I opened bug 96871 [3] about this.
> 
> Thanks in advance for your help.
> 
> Best regards,
> 
> Laurent BP
> 
> [1]
> http://opengrok.libreoffice.org/xref/core/chart2/source/view/axes/ScaleAutomatism.cxx#calculateExplicitIncrementAndScaleForLogarithmic
> [2]
> http://opengrok.libreoffice.org/xref/core/chart2/source/view/axes/ScaleAutomatism.cxx#362
> [3] https://bugs.documentfoundation.org/show_bug.cgi?id=96871
> 
> 
> 
> 
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