[vtkusers] A simple and efficient histogram class?

[Bill Lorensen]

Here an example that uses vtkImageHistogram:

https://lorensen.github.io/VTKExamples/site/Cxx/Images/ImageHistogram/


On Wed, Sep 20, 2017 at 10:09 AM, Miguel Nunes <m.nunes at fratoria.com> wrote:
> Hello,
> I would like to ask this list about histograms in VTK c++. I have been a vtk
> user for several years, but never had the need to use histograms through vtk
> as I was using pure c++ and openGL.
> Now, I would like to simply plot a basic histogram of a float 3d image. I
> have taken a look at the examples provided but I find myself quite confused.
>  Honestly, for an advanced visualization toolkit I am quite surprised to
> find
> it so complicated. There are classes such as vtkPlot that allow bars, then
> there is vtkBarChartActor, vtkImageAccumulate, vtkXYPlotActor,
> vtkImageHistogramStatistics and vtkImageHistogram.
>
> It all needs to be remixed, connected and many properties have to be set
> manually.
>
> Maybe I am missing a class (or the point), but in general terms I would like
> to easily plot and render a simple histogram, like:
>
> myHistogram->setData( vtkImagaData *)
> myHistogram->setXRange(range[2]) // clips values under and above the range
> specified
> myHistogram->setNumberOfBins(15) // calculates the bin width and each bins'
> Y
> myHistogram->update()            //generate the whole thing
> renderer->getActor()->setData(myHistogram)
>
> ...and then its done.
>
> Any chance this actually exist? Thank you very much!
>
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