vtk获取鼠标光标处的坐标

获取鼠标光标处的坐标可以使用vtkRenderWindowInteractor类的GetEventPosition()方法。该方法返回鼠标事件的屏幕坐标(x, y)，然后使用vtkRenderWindow的ScreenToView()方法将屏幕坐标转换为视图坐标。具体实现代码如下：

// 创建vtkRenderWindow和vtkRenderer
vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
renderWindow->AddRenderer(renderer);

// 创建vtkRenderWindowInteractor并设置事件处理程序
vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(renderWindow);

// 获取鼠标事件的屏幕坐标，并将其转换为视图坐标
void MouseMoveCallback(vtkObject* caller, long unsigned int vtkNotUsed(eventId), void* clientData, void* vtkNotUsed(callData))
{
    vtkRenderWindowInteractor* interactor = static_cast<vtkRenderWindowInteractor*>(caller);
    int* screenPos = interactor->GetEventPosition();
    double viewPos[3];
    vtkRenderWindow* renderWindow = interactor->GetRenderWindow();
    vtkRenderer* renderer = renderWindow->GetRenderers()->GetFirstRenderer();
    renderer->SetDisplayPoint(screenPos[0], screenPos[1], 0.0);
    renderer->DisplayToWorld();
    renderer->GetWorldPoint(viewPos);
}

interactor->AddObserver(vtkCommand::MouseMoveEvent, mouseMoveCallback);

// 开始交互
interactor->Initialize();
renderWindow->Render();
interactor->Start();

在上面的代码中，MouseMoveCallback()方法在鼠标移动事件发生时被调用，它首先使用vtkRenderWindowInteractor类的GetEventPosition()方法获取鼠标事件的屏幕坐标(screenPos)，然后使用vtkRenderWindow和vtkRenderer将屏幕坐标转换为视图坐标(viewPos)。