Re: 2D Histogram (or spectrogram) chart

Hi,

I had a look at this test which you were just looking for:
https://github.com/Kitware/VTK/blob/master/Charts/Core/Testing/Cxx/TestHistogram2D.cxx

Best,

2018年12月14日(金) 23:57 Mohamed Amine Mzoughi <[email protected]>:
>
> Hello,
>
> I've seen this screenshot of a 2D chart :
> https://www.na-mic.org/wiki/File:VTK-Charts-Histogram2D.png and I didn't
> find the VTK class that allows me to create it. (the original link is :
> https://www.na-mic.org/wiki/2011_Summer_Project_Week_Breakout_Session_VTKCharts).
> Is this chart was removed ? where can I found its source code ?
>
> Currently I am using a vtkImageActor to display a 2-D color map (or
> spectrogram) but I am struggling with the camera and the scale of the
> actor to make it right (to fit the whole window) and I am drawing the
> axis in another QVTKOpenGL widget managing a 2D scene (vtkAxis - like
> the ParaView Slice View). I am not really comfortable with this solution.
>
> I don't want to use APIs like QCustomPlot or Qwt because I will have to
> convert my data to use them and this will add another dependency to my
> program.
>
> I played a little with vtkContextView, vtkContextArea and vtkImageItem
> to display a vtkImageData, but there is no possibility to change the
> color or display a vtkImageData whose point data array has a single
> compnent (it should have 4 components: r,g,b,a).
>
> Thanks.
>
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