[QGIS-Developer] Classification of values around zero

[Pierre_Loicq]

Hello,

I added a new method of classification in the graduated methods (symbology).
It is aimed at plotting data that are centered on zero, with a class around
zero (like [-1,1] instead of [-1,0],[0,1] ), and with a colorbar that stay
symmetric around zero (for this I remove the extra classes). It uses the
prettyBreaks method. If data are all positive or negative, an alert box
appear.

https://github.com/qgis/QGIS/pull/5161

Hoping that you can include it in 3.0
Thank you
Pierre (Tours, France)



Pierre_Loicq wrote
> Hi,
> 
> At the office, I often need to create map of modeled biases (float
> values), where it make sense to have a first class centered on zero
> (symbology/graduated). I learned C++ some months ago and would like to add
> this functionality as a first application, on the  master branch. 
> 
> Pierre





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