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plotting - SetOptions or other approach to imposing default styling of text in a BarChart Legend?


Gustavo Delfino's answer to an earlier question showed that it is possible to use the third argument to Placed to format text in a BarChart legend as desired. For example, without this argument, the legend text in the example below would still be small and in Times, even though I have used SetOptions to style BaseStyle for BarChart, Graphics, etc.


BarChart[RandomVariate[NormalDistribution[0, 0.6], 40], 
 ChartStyle -> Join[ConstantArray[Green, {39}], {Orange}], 
 ChartLegends -> Placed[Join[ConstantArray[None, {39}], {"Preliminary estimates"}], 
   Bottom, Style[#, FontFamily -> "Arial", FontSize -> 14] &]]

enter image description here



Is there a way to set this globally? I’d like to enforce the font style of legends in a package, the way I have already done for the frame around the legend using Mr.Wizard’s answer to an earlier question of mine on StackOverflow. I would have thought some setting of BaseStyle should work but these are the only (undocumented) options that Legending`GridLegend takes:


Options[Legending`GridLegend]

{"LegendPlacementFunction" -> Automatic, 
 LegendAppearance -> Automatic, 
 Legending`LegendContainer -> Automatic, 
 Legending`LegendHeading -> None, Legending`LegendImage -> Automatic, 
 Legending`LegendImage -> Automatic, 
 Legending`LegendLayout -> Automatic, 
 Legending`LegendPosition -> Automatic, 

 Legending`LegendSize -> Automatic}

Answer



I'm not certain I understand your requirements, but if you liked my prior answer that you referenced, why not use it here too? Since the LegendContainer is applied to the legend you can use it to insert directives:


SetOptions[Legending`GridLegend, 
  Legending`LegendContainer -> (Append[#, {Red, Bold, FontFamily -> "Helvetica"}] &) ]

BarChart[{{1, 2, 3}, {1, 3, 2}, {5, 2}}, 
  ChartLegends -> {"some", "text", "here"} ]

Mathematica graphics



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