vtk的command和observer设计模式初步使用

#include 
#include 
#include 
#include 
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#include 

VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);

class vtkMyCallback : public vtkCommand
{
public:
	static vtkMyCallback* New();
	virtual void Execute(vtkObject* caller, unsigned long eventId, void* callData);
};

vtkMyCallback* vtkMyCallback::New()
{
	return new vtkMyCallback;
}

void vtkMyCallback::Execute(vtkObject* caller, unsigned long eventId, void* callData)
{
	vtkRenderer* renderer = reinterpret_cast(caller);
	cout << renderer->GetActiveCamera()->GetPosition()[0] << " "
		<< renderer->GetActiveCamera()->GetPosition()[1] << " "
		<< renderer->GetActiveCamera()->GetPosition()[2] << endl;
}

class vtkMyCallback2 : public vtkCommand
{
public:
	static vtkMyCallback2* New();
	virtual void Execute(vtkObject* caller, unsigned long eventId, void* callData);
};

vtkMyCallback2* vtkMyCallback2::New()
{
	return new vtkMyCallback2;
}

void vtkMyCallback2::Execute(vtkObject* caller, unsigned long eventId, void* callData)
{
	vtkActor* actor = reinterpret_cast(caller);
	actor->GetProperty()->SetColor(1.0, 0.0, 0.0);
}

int main(void)
{
	// 创建一个cone
	vtkConeSource* cone = vtkConeSource::New();
	cone->SetResolution(5);
	cone->SetHeight(3);
	cone->SetRadius(1);

	// 实例化一个cone映射器
	vtkPolyDataMapper* coneMapper = vtkPolyDataMapper::New();
	coneMapper->SetInputConnection(cone->GetOutputPort());

	// 创建一个演员对象coneActor
	vtkActor* coneActor = vtkActor::New();
	coneActor->SetMapper(coneMapper);

	// 实例化回调类
	vtkMyCallback2* mycallback2 = vtkMyCallback2::New();
	coneActor->AddObserver(vtkCommand::PickEvent, mycallback2);
	mycallback2->Delete();

	// 搭建舞台，实例化对象renderer
	vtkRenderer* renderer = vtkRenderer::New();
	renderer->AddActor(coneActor);
	renderer->SetBackground(0.1, 0.2, 0.4);

	// 实例化回调类
	vtkMyCallback* mycallback = vtkMyCallback::New();
	renderer->AddObserver(vtkCommand::StartEvent, mycallback);
	mycallback->Delete();

	// 实例化一个灯光对象
	vtkSmartPointer light = vtkSmartPointer::New();
	// light->SetSpecularColor(1.0, 0.0, 0.0);	// 设置镜面反射光颜色为红色
	// light->SetDiffuseColor(0.0, 1.0, 0.0);	// 设置散射光为绿色
	light->SetColor(1.0, 0.0, 0.0);	// 设置环境光为红色
	renderer->AddLight(light);

	// 实例化一个相机对象camera
	// 相对屏幕，x轴正方向：从左往右   y轴正方向：从下往上   z轴正方向：从里往外
	vtkSmartPointer camera = vtkSmartPointer::New();
	camera->SetPosition(5.0, 0.0, 0.0);	// (x, y, z)
	camera->SetFocalPoint(-1.0, 0.0, 0.0);	// 焦点方向
	camera->SetViewUp(0.0, 1.0, 0.0);	// 线上向量
	renderer->SetActiveCamera(camera);

	// 实例化一个窗口对象renWin
	vtkRenderWindow* renWin = vtkRenderWindow::New();
	renWin->SetSize(400, 200);
	renWin->AddRenderer(renderer);

	// 实例化一个交互对象
	vtkRenderWindowInteractor* interactor = vtkRenderWindowInteractor::New();
	interactor->SetRenderWindow(renWin);

	renWin->Render();

	interactor->Initialize();
	interactor->Start();

	// 释放内存
	cone->Delete();
	coneActor->Delete();
	coneMapper->Delete();
	renderer->Delete();
	renWin->Delete();
	interactor->Delete();

	system("pause");
	return 0;
}