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

*To*: mathgroup at smc.vnet.net*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