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Mathematica 7: PieChart: opacity of a sector label?

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  • Subject: [mg93878] Mathematica 7: PieChart: opacity of a sector label?
  • From: Gordon Robertson <grobertson at>
  • Date: Thu, 27 Nov 2008 05:34:38 -0500 (EST)

Could I ask for help with the following? In Mathematica 6, a sector's label was
automatically dark (very readable) text, independent of the Opacity[] of its
sector. In Mathematica 7, at this point I'm finding that a pie sector's label has the
opacity of its sector. For example, the following has a pale blue sector
with an 'm1' label -- but both the blue and the label have an opacity of
0.5. Putting Opacity[1] into the BaseStyle Directive does not change this.

PieChart[{0.3, 1 - 0.3}, 

 ChartLabels -> Placed[{m1, ""}, "RadialCallout"], 

 ChartStyle -> {
  Directive[Darker[Blue], Opacity[0.5]],
  Directive[Gray, Opacity[0.2]]}, 

 BaseStyle -> Directive[FontFamily -> "Helvetica", 12],
 ImageSize -> 200]

I've studied the PieChart help documentation for some time without finding a
way to declare the label as opaque i.e. dark. I'm probably simply not seeing
what I need to see.

Thanks in advance for your help. I'm on an Intel Mac with OS X 10.5.5.

Gordon Robertson
Gene Regulation Informatics
Canada's Michael Smith Genome Sciences Centre
Vancouver BC Canada

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