[vtkusers] vtkChartLegend SetOpacity not working

[Joseph Melnyk]

vtkChartLegend::SetBrush must be pretty new, as it's not in my nightly build from January.  I'll build that and give it a go.  Thanks for the suggestion though; I've done similar things with GetPen() before so it should work out.

Regards
Joseph Melnyk



> -----Original Message-----
> From: Eric E. Monson [mailto:emonson at cs.duke.edu]
> Sent: Wednesday, July 06, 2011 3:01 PM
> To: Joseph Melnyk
> Cc: vtkusers at vtk.org
> Subject: Re: [vtkusers] vtkChartLegend SetOpacity not working
> 
> Hey Joseph,
> 
> It looks like SetOpacity is inherited by vtkChartLegend from vtkContextItem,
> but not really used.
> 
> It happens that you can change the background of the legend through
> GetBrush(), then set a color with a lower alpha, and change the outline
> through the GetPen() method, then change the opacity to a non-unity value.
> 
> Hopefully this accomplishes what you want, -Eric
> 
> P.S. I don't know if it makes any difference, but just so you know, you can
> also turn on the legend using chart->SetShowLegend(true);
> 
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Eric E Monson Duke Visualization
> Technology Group
> 
> 
> On Jul 6, 2011, at 2:29 PM, Joseph Melnyk wrote:
> 
> > I'm attempting to use vtkChartLegend's SetOpacity function and it doesn't
> appear to be working, neither in my code nor if I modify the test examples.
> For example, modifying the code at
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Plotting/LinePlot to include
> the following lines has no effect:
> >
> >  chart->GetLegend()->SetVisible(true);
> >  chart->GetLegend()->SetOpacity(.5);
> >
> > Am I missing something or is this broken?  I'm using a 5.6.1 version of VTK
> from the nightly (built in late January).
> >
> > Thanks!
> >
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