VTK学习笔记（十一）高亮拾取点_vtkdatasetsurfacefilter

最基础的物体还是点， 看看如何给点进行拾取并高亮。 想要拾取，先要激活窗口，然后按下字母'r'，然后用鼠标进行选择，选择后就输出结果。如图所示。

 代码如下

#include <vtkActor.h>
#include <vtkAreaPicker.h>
#include <vtkDataSetMapper.h>
#include <vtkDataSetSurfaceFilter.h>
#include <vtkExtractGeometry.h>
#include <vtkIdFilter.h>
#include <vtkIdTypeArray.h>
#include <vtkInteractorStyleRubberBandPick.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkObjectFactory.h>
#include <vtkPlanes.h>
#include <vtkPointData.h>
#include <vtkPointSource.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkRendererCollection.h>
#include <vtkSmartPointer.h>
#include <vtkUnstructuredGrid.h>
#include <vtkVersion.h>
#include <vtkVertexGlyphFilter.h>
 
#if VTK_VERSION_NUMBER >= 89000000000ULL
#define VTK890 1
#endif
 
#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);
 
namespace {
// Define interaction style
class InteractorStyle : public vtkInteractorStyleRubberBandPick
{
public:
  static InteractorStyle* New();
  vtkTypeMacro(InteractorStyle, vtkInteractorStyleRubberBandPick);
 
  InteractorStyle()
  {
    this->SelectedMapper = vtkSmartPointer<vtkDataSetMapper>::New();
    this->SelectedActor = vtkSmartPointer<vtkActor>::New();
    this->SelectedActor->SetMapper(SelectedMapper);
  }
 
  virtual void OnLeftButtonUp() override
  {
    vtkNew<vtkNamedColors> colors;
 
 
    // Forward events
    vtkInteractorStyleRubberBandPick::OnLeftButtonUp();
 
 
    vtkPlanes* frustum =
        static_cast<vtkAreaPicker*>(this->GetInteractor()->GetPicker())
            ->GetFrustum();
 
 
    vtkNew<vtkExtractGeometry> extractGeometry;
    extractGeometry->SetImplicitFunction(frustum);
    extractGeometry->SetInputData(this->Points);
    extractGeometry->Update();
 
 
    vtkNew<vtkVertexGlyphFilter> glyphFilter;
    glyphFilter->SetInputConnection(extractGeometry->GetOutputPort());
    glyphFilter->Update();
 
 
    vtkPolyData* selected = glyphFilter->GetOutput();
    std::cout << "Selected " << selected->GetNumberOfPoints() << " points."
              << std::endl;
    std::cout << "Selected " << selected->GetNumberOfCells() << " cells."
              << std::endl;
    this->SelectedMapper->SetInputData(selected);
    this->SelectedMapper->ScalarVisibilityOff();
 
 
    vtkIdTypeArray* ids = dynamic_cast<vtkIdTypeArray*>(
        selected->GetPointData()->GetArray("OriginalIds"));
    for (vtkIdType i = 0; i < ids->GetNumberOfTuples(); i++)
    {
      std::cout << "Id " << i << " : " << ids->GetValue(i) << std::endl;
    }
 
 
    this->SelectedActor->GetProperty()->SetColor(
        colors->GetColor3d("Red").GetData());
    this->SelectedActor->GetProperty()->SetPointSize(5);
 
 
    this->CurrentRenderer->AddActor(SelectedActor);
    this->GetInteractor()->GetRenderWindow()->Render();
    this->HighlightProp(NULL);
  }
 
 
  void SetPoints(vtkSmartPointer<vtkPolyData> points)
  {
    this->Points = points;
  }
 
 
private:
  vtkSmartPointer<vtkPolyData> Points;
  vtkSmartPointer<vtkActor> SelectedActor;
  vtkSmartPointer<vtkDataSetMapper> SelectedMapper;
};
 
 
vtkStandardNewMacro(InteractorStyle);
} // namespace
 
 
int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;
 
 
  vtkNew<vtkPointSource> pointSource;
  pointSource->SetNumberOfPoints(20);
  pointSource->Update();
 
 
  vtkNew<vtkIdFilter> idFilter;
  idFilter->SetInputConnection(pointSource->GetOutputPort());
#if VTK890
  idFilter->SetCellIdsArrayName("OriginalIds");
  idFilter->SetPointIdsArrayName("OriginalIds");
#else
  idFilter->SetIdsArrayName("OriginalIds");
#endif
  idFilter->Update();
 
 
  vtkNew<vtkDataSetSurfaceFilter> surfaceFilter;
  surfaceFilter->SetInputConnection(idFilter->GetOutputPort());
  surfaceFilter->Update();
 
 
  vtkPolyData* input = surfaceFilter->GetOutput();
 
 
  // Create a mapper and actor
  vtkNew<vtkPolyDataMapper> mapper;
  mapper->SetInputData(input);
  mapper->ScalarVisibilityOff();
 
 
  vtkNew<vtkActor> actor;
  actor->SetMapper(mapper);
  actor->GetProperty()->SetPointSize(3);
  actor->GetProperty()->SetColor(colors->GetColor3d("Gold").GetData());
 
 
  // Visualize
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("HighlightSelectedPoints");
 
 
  vtkNew<vtkAreaPicker> areaPicker;
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetPicker(areaPicker);
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
 
  renderer->AddActor(actor);
  renderer->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());
 
 
  renderWindow->Render();
 
 
  vtkNew<InteractorStyle> style;
  style->SetPoints(input);
  renderWindowInteractor->SetInteractorStyle(style);
 
 
  renderWindowInteractor->Start();
 
 
  return EXIT_SUCCESS;
}