[vtkusers] vtkPlot SetInput

[Marc Ferland]

Hi,

I'd like to automatically update the content of a vtkPlot but the
current behavior of the SetInput function does not seem to handle
this. Am I right? If so, how can I emulate this behavior?

Here's a sample application:

#include <vtkChartXY.h>
#include <vtkContextScene.h>
#include <vtkContextView.h>
#include <vtkDataObjectToTable.h>
#include <vtkFloatArray.h>
#include <vtkPen.h>
#include <vtkPlot.h>
#include <vtkPolyData.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkTable.h>

int main()
{
   vtkSmartPointer<vtkSphereSource> sphereSource = 
      vtkSmartPointer<vtkSphereSource>::New();
 
   vtkSmartPointer<vtkDataObjectToTable> dataObjectToTable = 
      vtkSmartPointer<vtkDataObjectToTable>::New();
   dataObjectToTable->SetInputConnection(sphereSource->GetOutputPort());
   dataObjectToTable->SetFieldType(vtkDataObjectToTable::POINT_DATA);

   // Have to manually update this object before setting it to the vtkPlot
   dataObjectToTable->Update();

   vtkSmartPointer<vtkContextView> view = 
      vtkSmartPointer<vtkContextView>::New();
   view->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
 
   vtkSmartPointer<vtkChartXY> chart = 
      vtkSmartPointer<vtkChartXY>::New();
   view->GetScene()->AddItem(chart);
   vtkPlot *line = chart->AddPlot(vtkChart::LINE);
   line->SetUseIndexForXSeries(true);
   line->SetInput(dataObjectToTable->GetOutput(), 0, 0);
   line->SetColor(0, 255, 0, 255);
   line->SetWidth(1.0);
 
   view->GetInteractor()->Initialize();
   view->GetInteractor()->Start();

   return EXIT_SUCCESS;
}

Basically, what I'd like to do is remove the call to
dataObjectToTable->Update() and let the pipeline update itself when the
view is rendered. I guess what I'm looking for is a function equivalent
to SetInputConnection but from the vtkPlot interface.

Regards,

Marc