[vtk-developers] Possible vtkScalarBarActor improvement

[David Thompson]

Hi all,

> I took a quick look at vtkScalarBarActor/vtkScalarsToColors and saw quite a bit changes between 5.10 and 6.0. ...

Yes, it uses the new matplotlib MathText rendering engine to draw labels and that required a lot of skullduggery to get working with VTK 6's modules. I would advise against trying to backport it.

	David

>  
> From: Jean-Christophe Fillion-Robin [mailto:jchris.fillionr at kitware.com] 
> Sent: Monday, September 16, 2013 12:41 PM
> To: Wang, Kevin
> Cc: David Thompson; vtk-developers at vtk.org
> Subject: Re: [vtk-developers] Possible vtkScalarBarActor improvement
>  
> Hi Kevin, 
>  
> I would suggest you a submit a pull request to the SlicerVTK fork backporting the functionality you would like. Then, when we will transition to VTK6, it will go very smoothly. 
>  
> In parallel, you could also submit a patch to the VTK list that would be integrated to the VTK 5.10 maintenance branch.
>  
> Thanks
> Jc
>  
> 
> On Mon, Sep 16, 2013 at 11:24 AM, Wang, Kevin <kevin.wang at rmp.uhn.on.ca> wrote:
> Thanks David. I think I am ok with switching the vtkStringArrays on the fly.
> 
> Kevin
> 
> -----Original Message-----
> From: David Thompson [mailto:david.thompson at kitware.com]
> Sent: Monday, September 16, 2013 11:17 AM
> To: Wang, Kevin
> Cc: 'Jean-Christophe Fillion-Robin'; vtk-developers at vtk.org
> Subject: Re: [vtk-developers] Possible vtkScalarBarActor improvement
> 
> Hi Kevin,
> 
> > The SetAnnotation method in vtkScalarsToColors is what I need in deed. ...
> 
> Great.
> 
> > The interface is fine. I wonder if it is possible to add a method to control whether values are used for labels in the vtkScalarBarActor or the annotations are used. ...
> 
> I would be willing to consider adding something to the vtkScalarsToColors class to switch between sets of strings if we can come up with a clean API that preserves backwards-compatability -- but don't think the class should be  responsible for generating a string label for each value; it is very hard to get otherwise-rational people to agree on how to format numbers and vtkVarints as text. :-)
> 
>         David
> 
> 
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