VTK 鼠标画线（点移动线可同步更新）

鼠标交互事件：点两个点形成一条线

通过鼠标点两个点，同时标记这两个点，形成一条线。（只有一条线，并不是每次点两个点都会新出现一条线）

这个版本是个初级版本，（后面我也实现了任意拖动一个点，直线会相应发生变化，以及两点在Z轴上的变动，线也会同步更新）。代码太多所以我也没有贴上来，有需要了我会发出来！

double point1[3]{ 0 };double point2[3]{ 0 };double point3[3]{ 0 };double p[3]{ 0 };
double WorldPointbegin[3]{ 0 };double WorldPointend[3]{ 0 };
int *clickPosbegin;int *clickPosend;int *click;
class customMouseInteractorStyle : public vtkInteractorStyleTrackballCamera{
public:static customMouseInteractorStyle* New();vtkTypeMacro(customMouseInteractorStyle, vtkInteractorStyleTrackballCamera);
protected:;
public:vtkPolyDataMapper *lineMapper = vtkPolyDataMapper::New();vtkSmartPointer<vtkActor> lineActor=vtkSmartPointer<vtkActor>::New();vtkSmartPointer<vtkLineSource> lineSource= vtkSmartPointer<vtkLineSource>::New();virtual void OnLeftButtonDown(){if(i==0){//打印鼠标左键像素位置clickPosbegin = this->Interactor->GetEventPosition();point1[0]=clickPosbegin[0];point1[1]=clickPosbegin[1];std::cout << "clickPosbegin: " << this->Interactor->GetEventPosition()[0]<< " " << this->Interactor->GetEventPosition()[1] << std::endl;//注册拾取点函数this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],this->Interactor->GetEventPosition()[1], 0,  // always zero.this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());//打印拾取点空间位置this->Interactor->GetPicker()->GetPickPosition(WorldPointbegin);std::cout << "WorldPointbegin :" << WorldPointbegin[0] << "," << WorldPointbegin[1] << "," << WorldPointbegin[2] << std::endl;//对拾取点进行标记sphereSourcebegin->Update();mapperbegin->SetInputConnection(sphereSourcebegin->GetOutputPort());actorbegin->SetMapper(mapperbegin);actorbegin->SetPosition(WorldPointbegin);actorbegin->SetScale(4);actorbegin->GetProperty()->SetColor(1.0, 0.0, 1.0);this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actorbegin);renderer->GetRenderWindow()->GetInteractor()->Initialize();renderer->GetRenderWindow()->GetInteractor()->Render();i=1;}else if(i==1){//打印鼠标左键像素位置clickPosend = this->Interactor->GetEventPosition();point2[0]=clickPosend[0];point2[1]=clickPosend[1];std::cout << "clickPosend: " << this->Interactor->GetEventPosition()[0]<< " " << this->Interactor->GetEventPosition()[1] << std::endl;//注册拾取点函数this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],this->Interactor->GetEventPosition()[1], 0,  // always zero.this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());//打印拾取点空间位置this->Interactor->GetPicker()->GetPickPosition(WorldPointend);std::cout << "WorldPointend : " << WorldPointend[0] << " " << WorldPointend[1] << " " << WorldPointend[2] << std::endl;//对拾取点进行标记sphereSourcend->Update();mapperend->SetInputConnection(sphereSourcend->GetOutputPort());actorend->SetMapper(mapperend);actorend->SetPosition(WorldPointend);actorend->SetScale(4);actorend->GetProperty()->SetColor(0.0, 1.0, 1.0);Point_in_Tube_function(pointsPolydata);lineSource->SetPoint1(WorldPointbegin);lineSource->SetPoint2(WorldPointend);//两点确定一条直线lineSource->Update();lineMapper->SetInputConnection(lineSource->GetOutputPort());lineMapper->ScalarVisibilityOff();lineActor->SetMapper(lineMapper);lineActor->GetProperty()->SetColor(0, 0, 0);//线的颜色设置lineActor->GetProperty()->SetOpacity(1);//0是透明/***这里可以添加图像与直线的交互过程**/this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actorend);this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(lineActor);i=0;renderer->GetRenderWindow()->GetInteractor()->Initialize();renderer->GetRenderWindow()->GetInteractor()->Render();}}{ vtkInteractorStyleTrackballCamera::OnLeftButtonUp();}};
vtkStandardNewMacro(customMouseInteractorStyle);

更新：这个是鼠标拖动begin 和end 中的任意一点，直线随即更新。可以看到其中有很多代码是重复的，我在实际用的时候重复的做成函数调用，因为放这函数多了显得乱，我就直接贴上来了。如果有问题，可以及时沟通！

其中：point1和point2始终是 begin和end 的鼠标点的二维坐标（后面转化为3维），通过判断point3与她们两个的位置关系，判断当前操作的点。

    virtual void OnMiddleButtonDown(){click = this->GetInteractor()->GetEventPosition();point3[0] = click[0];point3[1] = click[1];if(abs(point3[0]-point1[0])<50 && abs(point3[1]-point1[1])<50)beginOrend = 1;else if (abs(point3[0]-point2[0])<50 && abs(point3[1]-point2[1])<50)beginOrend = 2;elsebeginOrend = 0; }virtual void OnMiddleButtonUp(){if(beginOrend == 1){ //操作的是第一个点clickPosbegin = this->Interactor->GetEventPosition();point1[0]=clickPosbegin[0];point1[1]=clickPosbegin[1];std::cout << "clickPosbegin: " << this->Interactor->GetEventPosition()[0]<< " " << this->Interactor->GetEventPosition()[1] << std::endl;//注册拾取点函数this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],this->Interactor->GetEventPosition()[1], 0,  // always zero.this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());//打印拾取点空间位置this->Interactor->GetPicker()->GetPickPosition(WorldPointbegin);std::cout << "WorldPointbegin :" << WorldPointbegin[0] << "," << WorldPointbegin[1] << "," << WorldPointbegin[2] << std::endl;//对拾取点进行标记sphereSourcebegin->Update();mapperbegin->SetInputConnection(sphereSourcebegin->GetOutputPort());actorbegin->SetMapper(mapperbegin);actorbegin->SetPosition(WorldPointbegin);actorbegin->SetScale(4);actorbegin->GetProperty()->SetColor(1.0, 0.0, 1.0);lineSource->SetPoint1(WorldPointbegin);lineSource->SetPoint2(WorldPointend);lineSource->Update();lineMapper->SetInputConnection(lineSource->GetOutputPort());lineMapper->ScalarVisibilityOff();lineActor->SetMapper(lineMapper);lineActor->GetProperty()->SetColor(0, 0, 0);lineActor->GetProperty()->SetOpacity(1);this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actorbegin);this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(lineActor);renderer->GetRenderWindow()->GetInteractor()->Initialize();renderer->GetRenderWindow()->GetInteractor()->Render();}else if (beginOrend == 2) //操作的是第二个点{//打印鼠标左键像素位置clickPosend = this->Interactor->GetEventPosition();point2[0]=clickPosend[0];point2[1]=clickPosend[1];std::cout << "clickPosend: " << this->Interactor->GetEventPosition()[0]<< " " << this->Interactor->GetEventPosition()[1] << std::endl;//注册拾取点函数this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],this->Interactor->GetEventPosition()[1], 0,  // always zero.this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());//打印拾取点空间位置this->Interactor->GetPicker()->GetPickPosition(WorldPointend);std::cout << "WorldPointend : " << WorldPointend[0] << " " << WorldPointend[1] << " " << WorldPointend[2] << std::endl;//对拾取点进行标记sphereSourcend->Update();mapperend->SetInputConnection(sphereSourcend->GetOutputPort());actorend->SetMapper(mapperend);actorend->SetPosition(WorldPointend);actorend->SetScale(4);actorend->GetProperty()->SetColor(0.0, 1.0, 1.0);Point_in_Tube_function(pointsPolydata);lineSource->SetPoint1(WorldPointbegin);lineSource->SetPoint2(WorldPointend);//两点确定一条直线lineSource->Update();lineMapper->SetInputConnection(lineSource->GetOutputPort());lineMapper->ScalarVisibilityOff();lineActor->SetMapper(lineMapper);lineActor->GetProperty()->SetColor(0, 0, 0);//线的颜色设置lineActor->GetProperty()->SetOpacity(1);//0是透明this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actorend);this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(lineActor);renderer->GetRenderWindow()->GetInteractor()->Initialize();renderer->GetRenderWindow()->GetInteractor()->Render();}else {beginOrend = 0;}}

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VTK 鼠标画线（点移动线可同步更新）

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