Difference between revisions of "VTK/Examples/Cxx/Filtering/ExtractVisibleCells"

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(Replaced content with "= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/Filtering/ExtractVisibleCells ExtractVisibleCells] on the new [https://lorensen.github.io/VTKExamples/site/ VTKEx...")
 
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<div class="floatcenter">[[File:VTK_Examples_Baseline_Filtering_TestExtractVisibleCells.png]]</div>
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= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/Filtering/ExtractVisibleCells ExtractVisibleCells] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples website].''' =
==ExtractVisibleCells.cxx==
 
<source lang="cpp">
 
#include <vtkVersion.h>
 
 
 
#include <vtkSphereSource.h>
 
#include <vtkPolyData.h>
 
#include <vtkSmartPointer.h>
 
#include <vtkPolyDataMapper.h>
 
#include <vtkActor.h>
 
#include <vtkRenderWindow.h>
 
#include <vtkRenderer.h>
 
#include <vtkRenderWindowInteractor.h>
 
#include <vtkHardwareSelector.h>
 
#include <vtkInteractorStyleTrackballCamera.h>
 
#include <vtkObjectFactory.h>
 
#include <vtkRendererCollection.h>
 
#include <vtkDataSetMapper.h>
 
#include <vtkExtractSelection.h>
 
#include <vtkSelection.h>
 
#include <vtkProperty.h>
 
 
 
// Define interaction style
 
class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera
 
{
 
  public:
 
    static KeyPressInteractorStyle* New();
 
    vtkTypeMacro(KeyPressInteractorStyle, vtkInteractorStyleTrackballCamera);
 
 
 
    virtual void OnKeyPress()
 
    {
 
      // Get the keypress
 
      std::string key = this->Interactor->GetKeySym();
 
 
 
      // "s" for "s"elect
 
      if(key.compare("s") == 0)
 
        {
 
        vtkSmartPointer<vtkHardwareSelector> selector =
 
          vtkSmartPointer<vtkHardwareSelector>::New();
 
        selector->SetRenderer(this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
 
        int* temp = this->Interactor->GetRenderWindow()->GetSize();
 
        unsigned int windowSize[4];
 
        windowSize[0] = temp[2];
 
        windowSize[1] = temp[3];
 
        windowSize[2] = temp[0];
 
        windowSize[3] = temp[1];
 
        /*
 
        for(unsigned int i = 0; i < 4; i++)
 
          {
 
          windowSize[i] = temp[i];
 
          }
 
        */
 
        selector->SetArea(windowSize);
 
        selector->SetFieldAssociation(vtkDataObject::FIELD_ASSOCIATION_CELLS);
 
        vtkSelection* selection = selector->Select();
 
        std::cout << "Selection has " << selection->GetNumberOfNodes() << " nodes." << std::endl;
 
 
 
        vtkSmartPointer<vtkExtractSelection> extractSelection =
 
          vtkSmartPointer<vtkExtractSelection>::New();
 
#if VTK_MAJOR_VERSION <= 5
 
        extractSelection->SetInput(0, this->Data);
 
        extractSelection->SetInput(1, selection);
 
#else
 
        extractSelection->SetInputData(0, this->Data);
 
        extractSelection->SetInputData(1, selection);
 
#endif
 
        extractSelection->Update();
 
 
 
        vtkSmartPointer<vtkDataSetMapper> mapper =
 
          vtkSmartPointer<vtkDataSetMapper>::New();
 
        mapper->SetInputConnection(extractSelection->GetOutputPort());
 
 
 
        vtkSmartPointer<vtkActor> actor =
 
          vtkSmartPointer<vtkActor>::New();
 
        actor->SetMapper(mapper);
 
        actor->GetProperty()->SetColor(1,0,0);
 
        this->Renderer->AddActor(actor);
 
       
 
        }
 
 
 
      // Forward events
 
      vtkInteractorStyleTrackballCamera::OnKeyPress();
 
    }
 
 
 
    vtkPolyData* Data;
 
    vtkRenderer* Renderer;
 
 
 
};
 
vtkStandardNewMacro(KeyPressInteractorStyle);
 
 
 
int main(int , char *[])
 
{
 
  // Create a sphere
 
  vtkSmartPointer<vtkSphereSource> sphereSource =
 
    vtkSmartPointer<vtkSphereSource>::New();
 
  sphereSource->SetCenter(0.0, 0.0, 0.0);
 
  sphereSource->SetRadius(5.0);
 
  sphereSource->Update();
 
 
 
  // Create a mapper and actor
 
  vtkSmartPointer<vtkPolyDataMapper> mapper =
 
    vtkSmartPointer<vtkPolyDataMapper>::New();
 
  mapper->SetInputConnection(sphereSource->GetOutputPort());
 
 
 
  vtkSmartPointer<vtkActor> actor =
 
    vtkSmartPointer<vtkActor>::New();
 
  actor->SetMapper(mapper);
 
 
 
  // Create a renderer, render window, and interactor
 
  vtkSmartPointer<vtkRenderer> renderer =
 
    vtkSmartPointer<vtkRenderer>::New();
 
  vtkSmartPointer<vtkRenderWindow> renderWindow =
 
    vtkSmartPointer<vtkRenderWindow>::New();
 
  renderWindow->SetMultiSamples(0); // Turn off anti-aliasing
 
  renderWindow->AddRenderer(renderer);
 
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
 
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
 
 
  vtkSmartPointer<KeyPressInteractorStyle> style =
 
    vtkSmartPointer<KeyPressInteractorStyle>::New();
 
  style->Renderer = renderer;
 
  renderWindowInteractor->SetInteractorStyle(style);
 
  style->SetCurrentRenderer(renderer);
 
  style->Data = sphereSource->GetOutput();
 
 
 
  // Add the actor to the scene
 
  renderer->AddActor(actor);
 
  renderer->SetBackground(.3, .6, .3); // Background color green
 
 
 
  // Render and interact
 
  renderWindow->Render();
 
  renderWindowInteractor->Start();
 
 
 
  return EXIT_SUCCESS;
 
}
 
</source>
 
 
 
{{VTKCMakeLists|{{SUBPAGENAME}}}}
 

Latest revision as of 20:35, 12 April 2019

See ExtractVisibleCells on the new VTKExamples website.