VTK/Examples/Developers/PassInputTypeAlgorithm

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPolyData.h>
 
#include "vtkTestFilter.h"
 
int main(int, char *[])
{
  vtkSmartPointer<vtkPoints> points = 
      vtkSmartPointer<vtkPoints>::New();
  points->InsertNextPoint(0.0, 0.0, 0.0);
  points->InsertNextPoint(0.0, 0.0, 1.0);
 
  vtkSmartPointer<vtkPolyData> inputPolydata = 
      vtkSmartPointer<vtkPolyData>::New();
  inputPolydata->SetPoints(points);
 
  std::cout << "Input points: " << inputPolydata->GetNumberOfPoints() <<std:: endl;
 
  vtkSmartPointer<vtkTestFilter> filter = 
      vtkSmartPointer<vtkTestFilter>::New();
  filter->SetInput(inputPolydata);
  filter->Update();
 
  vtkPolyData* outputPolydata = vtkPolyData::SafeDownCast(filter->GetOutput());
 
  std::cout << "Output points: " << outputPolydata->GetNumberOfPoints() << std::endl;
 
  return EXIT_SUCCESS;
}

// .NAME vtkTestFilter
// .SECTION Description
// vtkTestFilter
 
#ifndef __vtkTestFilter_h
#define __vtkTestFilter_h
 
#include "vtkPassInputTypeAlgorithm.h"
 
class vtkTestFilter : public vtkPassInputTypeAlgorithm 
{
public:
  vtkTypeMacro(vtkTestFilter,vtkPassInputTypeAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);
 
  static vtkTestFilter *New();
 
protected:
  vtkTestFilter(){}
  ~vtkTestFilter(){}
 
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
 
private:
  vtkTestFilter(const vtkTestFilter&);  // Not implemented.
  void operator=(const vtkTestFilter&);  // Not implemented.
 
};
 
#endif

#include "vtkTestFilter.h"
 
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkInformationVector.h"
#include "vtkInformation.h"
#include "vtkDataObject.h"
#include "vtkSmartPointer.h"
#include "vtkPolyData.h"
 
vtkStandardNewMacro(vtkTestFilter);
 
int vtkTestFilter::RequestData(vtkInformation *vtkNotUsed(request),
                                             vtkInformationVector **inputVector,
                                             vtkInformationVector *outputVector)
{
  // Get the info objects
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);
 
 
  // Get the input and ouptut
  vtkPolyData *input = vtkPolyData::SafeDownCast(
      inInfo->Get(vtkDataObject::DATA_OBJECT()));
 
  vtkPolyData *output = vtkPolyData::SafeDownCast(
      outInfo->Get(vtkDataObject::DATA_OBJECT()));
 
  input->GetPoints()->InsertNextPoint(1.0, 1.0, 1.0);
 
  output->ShallowCopy(input);
 
  return 1;
}
 
//----------------------------------------------------------------------------
void vtkTestFilter::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);
}