vtk中鼠标拖vtkActor在Render移动

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#include 
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#include 


#include 
#include "vtkLineWidget2.h"
#include 
#include 
#include 
#include "vtkWidgetEventTranslator.h"
#include "vtkWidgetCallbackMapper.h"
#include "vtkWidgetEvent.h"

#include 
//#include 
#include 
#include 
#include "vtkNamedColors.h"


//如果出现错误请加上下面的声明
#include "vtkAutoInit.h" 
VTK_MODULE_INIT(vtkRenderingOpenGL2); // VTK was built with vtkRenderingOpenGL2
VTK_MODULE_INIT(vtkInteractionStyle);
//VTK_MODULE_INIT(vtkRenderingvolumeOpenGL2)
VTK_MODULE_INIT(vtkRenderingFreeType)

class MouseInteractorStyle2 : public vtkInteractorStyleTrackballCamera
{ 
       
public:
	static MouseInteractorStyle2* New();
	vtkTypeMacro(MouseInteractorStyle2, vtkInteractorStyleTrackballCamera);
	virtual void OnLeftButtonDown()
	{ 
       
		int* clickPos = this->GetInteractor()->GetEventPosition();

		// Pick from this location.
		vtkSmartPointer<vtkPropPicker>  picker =
			vtkSmartPointer<vtkPropPicker>::New();
		picker->Pick(clickPos[0], clickPos[1], 0, this->GetDefaultRenderer());

		double* pos = picker->GetPickPosition();
		std::cout << "Pick position (world coordinates) is: "
			<< pos[0] << " " << pos[1]
			<< " " << pos[2] << std::endl;

		std::cout << "Picked actor: " << picker->GetActor() << std::endl;
		if (picker->GetActor())
		{ 
       
			m_pSelectActor = picker->GetActor();
			m_bStatus = true;
			return;
		}

		//this->GetInteractor()->GetRenderWindow()->GetRenderers()->GetDefaultRenderer()->AddActor(actor);
		//this->GetDefaultRenderer()->AddActor(actor);
		// Forward events
		vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
	}
	virtual void OnMouseMove()
	{ 
       
		if (m_pSelectActor == nullptr)
			return;

		vtkRenderWindowInteractor* rwi = this->Interactor;
		if (m_bStatus == true)
		{ 
       
			double* obj_center = m_pSelectActor->GetCenter();
			double disp_obj_center[3], new_pick_point[4];
			double old_pick_point[4], motion_vector[3];
			this->ComputeWorldToDisplay(obj_center[0], obj_center[1], obj_center[2],
				disp_obj_center);

			this->ComputeDisplayToWorld(rwi->GetEventPosition()[0],
				rwi->GetEventPosition()[1],
				disp_obj_center[2],
				new_pick_point);

			this->ComputeDisplayToWorld(rwi->GetLastEventPosition()[0],
				rwi->GetLastEventPosition()[1],
				disp_obj_center[2],
				old_pick_point);

			motion_vector[0] = new_pick_point[0] - old_pick_point[0];
			motion_vector[1] = new_pick_point[1] - old_pick_point[1];
			motion_vector[2] = new_pick_point[2] - old_pick_point[2];
			if (m_pSelectActor->GetUserMatrix() != NULL)
			{ 
       
				vtkTransform* t = vtkTransform::New();
				t->PostMultiply();
				t->SetMatrix(m_pSelectActor->GetUserMatrix());
				t->Translate(motion_vector[0], motion_vector[1], motion_vector[2]);
				m_pSelectActor->GetUserMatrix()->DeepCopy(t->GetMatrix());
				t->Delete();
			}
			else
			{ 
       
				//在当前位置增加偏移量
				m_pSelectActor->AddPosition(motion_vector[0],
					motion_vector[1],
					motion_vector[2]);
			}

			rwi->Render();
		}
		vtkInteractorStyleTrackballCamera::OnMouseMove();
	}
	virtual void OnLeftButtonUp()
	{ 
       
		m_bStatus = false;
		vtkInteractorStyleTrackballCamera::OnLeftButtonUp();
	}

private:
	vtkSmartPointer<vtkActor> m_pSelectActor = nullptr;

	bool m_bStatus = false;
};

vtkStandardNewMacro(MouseInteractorStyle2);
#include 
int main(int, char[])
{ 
       
	vtkSmartPointer<vtkPlaneSource> planeSource =
		vtkSmartPointer<vtkPlaneSource>::New();
	planeSource->SetCenter(0, 0, 0);
	//planeSource->SetRadius(2);
	planeSource->Update();
	// Create a polydata object
	vtkPolyData *polydata = planeSource->GetOutput();

	vtkSmartPointer<vtkPolyDataMapper> mapper =
		vtkSmartPointer<vtkPolyDataMapper>::New();
	mapper->SetInputData(polydata);

	vtkSmartPointer<vtkActor> actor =
		vtkSmartPointer<vtkActor>::New();
	actor->SetMapper(mapper);

	std::cout << "Actor address: " << actor << std::endl;
	vtkSmartPointer<vtkSphereSource> planeSource1 =
		vtkSmartPointer<vtkSphereSource>::New();
	planeSource1->SetCenter(10, 10, 10);
	planeSource1->SetRadius(2);
	planeSource1->Update();
	// Create a polydata object
	vtkPolyData* polydata1 = planeSource1->GetOutput();

	// Create a mapper
	vtkSmartPointer<vtkPolyDataMapper> mapper1 =
		vtkSmartPointer<vtkPolyDataMapper>::New();

	mapper1->SetInputData(polydata1);

	// Create an actor
	vtkSmartPointer<vtkActor> actor1 =
		vtkSmartPointer<vtkActor>::New();
	actor1->SetMapper(mapper1);
	std::cout << "Actor1 address: " << actor1 << std::endl;
	//std::cout << "a address: " << a << std::endl;
	// A renderer and render window
	vtkSmartPointer<vtkRenderer> renderer =
		vtkSmartPointer<vtkRenderer>::New();
	vtkSmartPointer<vtkRenderWindow> renderWindow =
		vtkSmartPointer<vtkRenderWindow>::New();
	renderWindow->AddRenderer(renderer);

	// An interactor
	vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	renderWindowInteractor->SetRenderWindow(renderWindow);

	// Set the custom stype to use for interaction.
	vtkSmartPointer<MouseInteractorStyle2> style =
		vtkSmartPointer<MouseInteractorStyle2>::New();
	style->SetDefaultRenderer(renderer);
	//style->setNeedSelectActor(actor1);

	renderWindowInteractor->SetInteractorStyle(style);

	// Add the actors to the scene
	renderer->AddActor(actor);
	renderer->AddActor(actor1);
	renderer->SetBackground(0, 0, 1);

	// Render and interact
	renderWindow->Render();
	renderWindowInteractor->Initialize();
	renderWindowInteractor->Start();

	return EXIT_SUCCESS;
}