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Re: Mathematica 7: PieChart: opacity of a sector label

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  • Subject: [mg93903] Re: [mg93878] Mathematica 7: PieChart: opacity of a sector label
  • From: Gordon Robertson <grobertson at bcgsc.ca>
  • Date: Fri, 28 Nov 2008 05:07:48 -0500 (EST)

David, 

Thank you. I want pale colors in the pie sectors, and your code works well
for this. My puzzle now is that the darkness or opacity of the radial
callout line to a sector's label is influenced by the color or opacity of
its sector. Given this, when a sector has a pale color its callout line is
hard to see. So far, my tests indicate that EdgeForm operates on sector
outlines and not on callout lines attached to sector outlines.

G


On 11/27/08 9:53 AM, "David Park" <djmpark at comcast.net> wrote:

> Seems like a bug or bad design. Are you really using Opacity in a pie chart,
> or are you just using it to lighten the colors? Why not use:
> 
> PieChart[{0.3, 1 - 0.3},
>  ChartLabels -> Placed[{m1, ""}, "RadialCallout"],
>  ChartStyle ->
>   {Directive[Blend[{Darker[Blue], White}, .5]],
>    Directive[GrayLevel[.9]]},
>  BaseStyle -> Directive[FontFamily -> "Helvetica", 12],
>  ImageSize -> 200]
> 
> 
> David Park
> djmpark at comcast.net
> http://home.comcast.net/~djmpark
> 
> 
> From: Gordon Robertson [mailto:grobertson at bcgsc.ca]
> 
> 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.
> 
> G

-- 
Gordon Robertson
Gene Regulation Informatics
Canada's Michael Smith Genome Sciences Centre
Vancouver BC Canada
www.bcgsc.ca




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