开发环境：
Windows 11 家庭中文版Microsoft Visual Studio Community 2019VTK-9.3.0.rc0vtk-example参考代码目的：学习与总结
demo解决问题：通过自定义vtkInteractorStyle类中成员函数OnLeftButtonDown，判断鼠标当前选中的是哪个actor；同理可自定义鼠标右键、滚轮、键盘等事件
关键类：vtkInteractorStyleTrackballActor允许用户与场景中彼此独立的对象进行交互（旋转、平移等）；根据实际应用场景有如下常见替换对象：
vtkInteractorStyleTrackballActor作用对象：actor; 形式：TrackballvtkInteractorStyleTrackballCamera作用对象：Camera; 形式：TrackballvtkInteractorStyleJoystickActor作用对象：actor; 形式：JoystickvtkInteractorStyleJoystickCamera作用对象：Camera; 形式：JoystickvtkInteractorStyleImage作用对象：vtkImageActor; 形式：绑定使相机的视图平面垂直于x-y平面……
参考：vtkInteractorStyle详细介绍
#include <vtkActor.h>
#include <vtkCamera.h>
#include <vtkCubeSource.h>
#include <vtkInteractorStyleTrackballActor.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
namespace {
// Handle mouse events.
class MouseInteractorStyle5 : public vtkInteractorStyleTrackballActor
{
public:
static MouseInteractorStyle5* New();
vtkTypeMacro(MouseInteractorStyle5, vtkInteractorStyleTrackballActor);
virtual void OnLeftButtonDown() override
{
// Forward events.
vtkInteractorStyleTrackballActor::OnLeftButtonDown();
if (this->InteractionProp == this->Cube)
{
std::cout << "Picked cube." << std::endl;
}
else if (this->InteractionProp == this->Sphere)
{
std::cout << "Picked sphere." << std::endl;
}
}
vtkActor* Cube;
vtkActor* Sphere;
};
vtkStandardNewMacro(MouseInteractorStyle5);
} // namespace
int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;
// Create a cube.
vtkNew<vtkCubeSource> cubeSource;
cubeSource->Update();
vtkNew<vtkPolyDataMapper> cubeMapper;
cubeMapper->SetInputConnection(cubeSource->GetOutputPort());
vtkNew<vtkActor> cubeActor;
cubeActor->SetMapper(cubeMapper);
cubeActor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());
// Create a sphere.
vtkNew<vtkSphereSource> sphereSource;
sphereSource->SetCenter(2, 0, 0);
sphereSource->Update();
// Create a mapper.
vtkNew<vtkPolyDataMapper> sphereMapper;
sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
// Create an actor.
vtkNew<vtkActor> sphereActor;
sphereActor->SetMapper(sphereMapper);
sphereActor->GetProperty()->SetColor(
colors->GetColor3d("LightGoldenrodYellow").GetData());
// A renderer and render window.
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("SelectAnActor");
// An interactor.
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Set the custom stype to use for interaction.
vtkNew<MouseInteractorStyle5> style;
style->SetDefaultRenderer(renderer);
style->Cube = cubeActor;
style->Sphere = sphereActor;
renderWindowInteractor->SetInteractorStyle(style);
renderer->AddActor(cubeActor);
renderer->AddActor(sphereActor);
renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
renderer->ResetCamera();
renderer->GetActiveCamera()->Zoom(0.9);
// Render and interact.
renderWindow->Render();
renderWindowInteractor->Initialize();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
