Difference between revisions of "VTK/Examples/Cxx/Developers/GraphAlgorithmSource"

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(Replaced content with "= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/Developers/GraphAlgorithmSource GraphAlgorithmSource] on the new [https://lorensen.github.io/VTKExamples/site/ VT...")
 
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This example produces a vtkGraph as output.
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= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/Developers/GraphAlgorithmSource GraphAlgorithmSource] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples website].''' =
 
 
==SourceExample.cxx==
 
<source lang="cpp">
 
#include <vtkSmartPointer.h>
 
#include <vtkGraph.h>
 
#include <vtkMutableUndirectedGraph.h>
 
 
 
#include "vtkTestSource.h"
 
 
 
int main (int, char *[])
 
{
 
  vtkSmartPointer<vtkTestSource> source =
 
    vtkSmartPointer<vtkTestSource>::New();
 
  source->Update();
 
 
 
  vtkGraph* outputGraph = source->GetOutput();
 
 
 
  std::cout << "Output number of vertices: "
 
            << outputGraph->GetNumberOfVertices() << std::endl;
 
 
 
  return EXIT_SUCCESS;
 
}
 
</source>
 
 
 
==vtkTestSource.h==
 
<source lang="cpp">
 
 
 
#ifndef __vtkTestSource_h
 
#define __vtkTestSource_h
 
 
 
#include "vtkGraphAlgorithm.h"
 
 
 
class vtkTestSource : public vtkGraphAlgorithm
 
{
 
public:
 
  vtkTypeRevisionMacro(vtkTestSource,vtkGraphAlgorithm);
 
  void PrintSelf(ostream& os, vtkIndent indent);
 
 
 
  static vtkTestSource *New();
 
 
protected:
 
  vtkTestSource();
 
  ~vtkTestSource();
 
 
 
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
 
 
 
  int RequestDataObject(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
 
 
 
private:
 
  vtkTestSource(const vtkTestSource&);  // Not implemented.
 
  void operator=(const vtkTestSource&);  // Not implemented.
 
 
 
};
 
 
 
#endif
 
 
 
</source>
 
 
 
==vtkTestSource.cxx==
 
<source lang="cpp">
 
#include "vtkTestSource.h"
 
 
 
#include "vtkObjectFactory.h"
 
#include "vtkStreamingDemandDrivenPipeline.h"
 
#include "vtkInformationVector.h"
 
#include "vtkInformation.h"
 
#include "vtkDataObject.h"
 
#include "vtkSmartPointer.h"
 
#include "vtkMutableUndirectedGraph.h"
 
#include "vtkUndirectedGraph.h"
 
#include "vtkGraph.h"
 
 
 
vtkCxxRevisionMacro(vtkTestSource, "$Revision: 1.70 $");
 
vtkStandardNewMacro(vtkTestSource);
 
 
 
vtkTestSource::vtkTestSource()
 
{
 
  this->SetNumberOfInputPorts(0);
 
  this->SetNumberOfOutputPorts(1);
 
}
 
 
 
vtkTestSource::~vtkTestSource()
 
{
 
 
 
}
 
 
 
int vtkTestSource::RequestData(vtkInformation *vtkNotUsed(request),
 
                                            vtkInformationVector **inputVector,
 
                                            vtkInformationVector *outputVector)
 
{
 
 
 
  vtkInformation *outInfo = outputVector->GetInformationObject(0);
 
 
 
  vtkGraph *output = vtkGraph::SafeDownCast(
 
      outInfo->Get(vtkDataObject::DATA_OBJECT()));
 
 
 
  vtkSmartPointer<vtkMutableUndirectedGraph> NewGraph = vtkSmartPointer<vtkMutableUndirectedGraph>::New();
 
   
 
  //add 3 vertices
 
  NewGraph->AddVertex();
 
  NewGraph->AddVertex();
 
  NewGraph->AddVertex();
 
 
 
  output->ShallowCopy(NewGraph);
 
 
 
  return 1;
 
}
 
 
 
int vtkTestSource::RequestDataObject(
 
                                      vtkInformation*,
 
                                      vtkInformationVector**,
 
                                      vtkInformationVector* )
 
{
 
 
 
  vtkUndirectedGraph *output = 0;
 
  output = vtkUndirectedGraph::New();
 
 
 
 
 
  this->GetExecutive()->SetOutputData(0, output);
 
  output->Delete();
 
 
 
  return 1;
 
}
 
 
 
 
 
//----------------------------------------------------------------------------
 
void vtkTestSource::PrintSelf(ostream& os, vtkIndent indent)
 
{
 
  this->Superclass::PrintSelf(os,indent);
 
}
 
 
 
 
 
 
 
</source>
 
 
 
==CMakeLists.txt==
 
<source lang="text">
 
cmake_minimum_required(VERSION 2.6)
 
PROJECT(vtkGraphAlgorithmSource)
 
 
 
FIND_PACKAGE(VTK REQUIRED)
 
INCLUDE(${VTK_USE_FILE})
 
 
 
ADD_EXECUTABLE(SourceExample SourceExample.cxx vtkTestSource.cxx)
 
TARGET_LINK_LIBRARIES(SourceExample vtkHybrid)
 
 
 
</source>
 

Latest revision as of 15:59, 12 April 2019