【VTK】VTK中的光标样式

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前言

本文分享VTK中的光标设置相关内容技术，希望对各位小伙伴有所帮助！

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前言

1. VTK中的光标样式

2. vtkCursor2D及其应用

3. vtkCursor3D及其应用

结论：

1. VTK中的光标样式

vtk中的光标样式在vtkRenderWindow中进行宏定义，见下面代码

    #define VTK_CURSOR_DEFAULT 0
    #define VTK_CURSOR_ARROW 1
    #define VTK_CURSOR_SIZENE 2
    #define VTK_CURSOR_SIZENW 3
    #define VTK_CURSOR_SIZESW 4
    #define VTK_CURSOR_SIZESE 5
    #define VTK_CURSOR_SIZENS 6
    #define VTK_CURSOR_SIZEWE 7
    #define VTK_CURSOR_SIZEALL 8
    #define VTK_CURSOR_HAND 9
    #define VTK_CURSOR_CROSSHAIR 10

VTK_CURSOR_DEFAULT	N/A
VTK_CURSOR_ARROW
VTK_CURSOR_SIZENE
VTK_CURSOR_SIZENW
VTK_CURSOR_SIZESW
VTK_CURSOR_SIZESE
VTK_CURSOR_SIZENS
VTK_CURSOR_SIZEWE
VTK_CURSOR_SIZEALL
VTK_CURSOR_HAND
VTK_CURSOR_CROSSHAIR

主要应用在 vtkAbstractWidget及其子类中，使用方法如下：

      this->RequestCursorShape(VTK_CURSOR_SIZEWE);
      this->RequestCursorShape(VTK_CURSOR_HAND);
      //其中RequestCursorShape在vtkInteractorObserver中定义

CursorShape设置实例Visualization/CursorShape

  // Create a sphere
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  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->AddRenderer(renderer);
  
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  // Add the actor to the scene
  renderer->AddActor(actor);
  renderer->SetBackground(1,1,1); // Background color white

  // Render and interact
  renderWindow->Render();

  //This must occur after the above Render() call or it does not work
  renderWindow->SetCurrentCursor(VTK_CURSOR_HAND); 
  
  renderWindowInteractor->Start();

2. vtkCursor2D及其应用

  vtkSmartPointer<vtkCursor2D> cursor = 
    vtkSmartPointer<vtkCursor2D>::New();
  cursor->SetModelBounds(-10,10,-10,10,0,0);
  cursor->AllOn();
  cursor->SetFocalPoint (5.0, 5.0, 0.0);
  cursor->OutlineOn();
  cursor->Update();

  vtkSmartPointer<vtkPolyDataMapper> cursorMapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  cursorMapper->SetInputConnection(cursor->GetOutputPort());
  vtkSmartPointer<vtkActor> cursorActor = 
    vtkSmartPointer<vtkActor>::New();
  cursorActor->GetProperty()->SetColor(1,0,0);
  cursorActor->SetMapper(cursorMapper);
  renderer->AddActor(cursorActor);

3. vtkCursor3D及其应用

  vtkSmartPointer<vtkCursor3D> cursor = 
    vtkSmartPointer<vtkCursor3D>::New();
  cursor->SetModelBounds(-10,10,-10,10,-10,10);
  cursor->AllOn();
  cursor->OutlineOff();
  cursor->Update();

  vtkSmartPointer<vtkPolyDataMapper> cursorMapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
  cursorMapper->SetInputConnection(cursor->GetOutputPort());
  vtkSmartPointer<vtkActor> cursorActor = 
    vtkSmartPointer<vtkActor>::New();
  cursorActor->GetProperty()->SetColor(1,0,0);
  cursorActor->SetMapper(cursorMapper);
  renderer->AddActor(cursorActor);