[vtkusers] R: Plot XY

[Darshan Pai]

You can directly use vtkXYPlotActor to get a plot of 2 arrays .

Here is a simple example to plot a array .
vtkSmartPointer<vtkXYPlotActor> plot =
vtkSmartPointer<vtkXYPlotActor>::New();
    plot->ExchangeAxesOff();
    plot->SetLabelFormat( "%g" );
    plot->SetXTitle( "Level" );
    plot->SetYTitle( "Frequency" );
    plot->SetXValuesToIndex();

for ( i = 0 ; i < 2 ; i++)
{
        vtkSmartPointer<vtkDoubleArray> array_s =
vtkSmartPointer<vtkDoubleArray>::New();
        vtkSmartPointer<vtkFieldData> field =
vtkSmartPointer<vtkFieldData>::New();
        vtkSmartPointer<vtkDataObject> data =
vtkSmartPointer<vtkDataObject>::New();

        for (int b = 0; b < 30; b++)   /// Assuming an array of 30 elements
        {
            hfile>>val;   /// My input is a file .
            array_s->InsertValue(b,val);
        }
        field->AddArray(array_s);
        data->SetFieldData(field);
        plot->AddDataObjectInput(data);
}


        plot->SetPlotColor(0,1,0,0);
        plot->SetPlotColor(1,0,1,0);

 vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
  renderer->AddActor(plot);
  renderer->AddActor(rightplot);
  renderer->AddActor(leftplot);

  vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer( renderer );
  renderWindow->SetSize(1000,1000);

  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
      vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow( renderWindow );

  // Initialize the event loop and then start it
  interactor->Initialize();
  interactor->Start();



On Sun, Mar 28, 2010 at 2:32 PM, <edoardo.belletti at alice.it> wrote:

>  I don't have the latests CVS version of VTK but VTK 5.4.2 that I have
> download from www.vtk.org
> and so the code that you suggest me it doesn't  work because it don't found
> these files:
> vtkChartXY, vtkPlot.h.h, vtkContextView.h, vtkContextScene.h
> There is some way to simply have a XYPlot of two vectors with my VTK
> release?
>
> Thank you
> Edoardo
>
> -----Messaggio originale-----
> Da: daviddoria at gmail.com per conto di David Doria
> Inviato: dom 28/03/2010 20.10
> A: edoardo.belletti at alice.it
> Cc: VTK_forum
> Oggetto: Re: [vtkusers] Plot XY
>
>
> On Sun, Mar 28, 2010 at 2:03 PM, <edoardo.belletti at alice.it> wrote:
>
> >   Hello,
> >
> > I am new to VTK so please sorry if this problem is obvious.
> >
> > I am trying to use the XYPlotActor object to create a simply plot of one
> > variable against another.
> >
> > I have found a piece of code in a past discussion and I have tried to run
> > it but the problem is that it doesn't found the
> > vtkFloatScalars.h file
> > is there anything in particular that I should add in the CMakeLists.txt
> to
> > include this library?
> > the code is this:
> >
> > int main()
> > {
> >         int dataSize = 4;
> >         float x[4] = { 0, 1.5, 6.2, 10.2 };
> >         float y[4] = {8, 9.3, 10.9, 27};
> >         vtkRectilinearGrid *curve1 = vtkRectilinearGrid::New();
> >         curve1->SetDimensions(dataSize,1,1);
> >         vtkFloatScalars *dataValues = vtkFloatScalars::New();
> >         vtkFloatScalars *xCoords = vtkFloatScalars::New();
> >
> >         int w;
> >         for(w=0; w<dataSize; w++)
> >         {
> >                 dataValues->InsertScalar(w, y[w]);
> >                 xCoords->InsertScalar(w, x[w]);
> >         }
> >
> >         curve1->SetXCoordinates(xCoords);
> >         curve1->GetPointData()->SetScalars(dataValues);
> >
> >         vtkXYPlotActor *theXYPlot = vtkXYPlotActor::New();
> >         theXYPlot->SetXValuesToArcLength();
> >         theXYPlot->AddInput(curve1);
> >         return 0;
> > }
> >
> > Thank you very much for the interest
> > Edoardo
> >
> >
> > There is no file in the current CVS called vtkFloatScalars.h, so I'm
> assuming that is very old code.
>
> Marcus Hanwell has been working hard on new charting functionality - there
> is a simple example here:
> http://www.vtk.org/Wiki/VTK_Examples_Chart_XY
>
> You must have the latests CVS version of VTK built to use this new feature.
> <http://www.vtk.org/Wiki/VTK_Examples_Chart_XY>
> Thanks,
>
> David
>
>
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