vtk拾取例子，很有参考价值

// #include "vtkalllibs.h" // #include "vtkActor.h" // #include "vtkPolyData.h" // #include "vtkUnstructuredGrid.h" // #include "vtkRenderWindow.h" // #include "vtkRenderer.h" // #include "vtkPointPicker.h" // #include "vtkRenderWindowInteractor.h" // #include "vtkPolyDataMapper.h" // #include "vtkSphereSource.h" // #include "vtkPolyDataReader.h" // #include "vtkPolyDataMapper.h" // #include "vtkShrinkFilter.h" // #include "vtkDataSetMapper.h" // #include "vtkRenderWindowInteractor.h" // #include "vtkIdList.h" // #include "vtkProperty.h" // #include "vtkCamera.h" // // static void PickCells(void *); // static vtkActor *sphereActor; // static vtkPolyData *plateOutput; // static vtkUnstructuredGrid *cells; // static vtkRenderWindow *renWin; // static vtkActor *cellsActor, *plateActor; // // //#include "SaveImage.h" // // void main( int argc, char *argv[] ) // { // vtkRenderer *renderer = vtkRenderer::New(); // renWin = vtkRenderWindow::New(); // renWin->AddRenderer(renderer); // // vtkPointPicker *picker = vtkPointPicker::New(); // picker->SetTolerance(0.01); // // vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New(); // iren->SetRenderWindow(renWin); // iren->SetPicker(picker); // // // read data file // vtkPolyDataReader *plate = vtkPolyDataReader::New(); // plate->SetFileName("plate.vtk"); // //plate->DebugOn(); // plateOutput = plate->GetOutput(); // vtkPolyDataMapper *plateMapper = vtkPolyDataMapper::New(); // plateMapper->SetInput(plate->GetOutput()); // plateActor = vtkActor::New(); // plateActor->SetMapper(plateMapper); // plateActor->GetProperty()->SetColor(0.5000,0.5400,0.5300); // // // create marker for pick // vtkSphereSource *sphere = vtkSphereSource::New(); // sphere->SetThetaResolution(8); sphere->SetPhiResolution(8); // sphere->SetRadius(0.01); // vtkPolyDataMapper *sphereMapper = vtkPolyDataMapper::New(); // sphereMapper->SetInput(sphere->GetOutput()); // sphereActor = vtkActor::New(); // sphereActor->SetMapper(sphereMapper); // sphereActor->GetProperty()->SetColor(1,0,0); // sphereActor->PickableOff(); // // // create actor and mapper to display picked cells // cells = vtkUnstructuredGrid::New(); // vtkShrinkFilter *shrink = vtkShrinkFilter::New(); // shrink->SetInput(cells); // shrink->SetShrinkFactor(0.75); // vtkDataSetMapper *cellsMapper = vtkDataSetMapper::New(); // cellsMapper->SetInput(shrink->GetOutput()); // cellsActor = vtkActor::New(); // cellsActor->SetMapper(cellsMapper); // cellsActor->PickableOff(); // cellsActor->VisibilityOff(); // cellsActor->GetProperty()->SetColor(0.5000,0.5400,0.5300); // // renderer->AddActor(cellsActor); // renderer->AddActor(plateActor); // renderer->AddActor(sphereActor); // renderer->SetBackground(1,1,1); // renderer->GetActiveCamera()->Elevation(30.0); // renderer->GetActiveCamera()->Azimuth(30.0); // renderer->GetActiveCamera()->Zoom(0.75); // // renWin->SetSize(300,300); // // // interact with data // renWin->Render(); // // // SAVEIMAGE( renWin ); // // iren->AddObserver( EndPickEvent, PickCells,(void *)iren); // iren->Start(); // // // Clean up // renderer->Delete(); // renWin->Delete(); // picker->Delete(); // iren->Delete(); // plate->Delete(); // plateMapper->Delete(); // plateActor->Delete(); // sphere->Delete(); // sphereMapper->Delete(); // sphereActor->Delete(); // cells->Delete(); // shrink->Delete(); // cellsMapper->Delete(); // cellsActor->Delete(); // } // // static void PickCells(void *arg) // { // vtkRenderWindowInteractor *iren = (vtkRenderWindowInteractor *)arg; // vtkPointPicker *picker = (vtkPointPicker *)iren->GetPicker(); // int i, cellId; // vtkIdList *cellIds = vtkIdList::New(); cellIds->Allocate(12); // vtkIdList *ptIds = vtkIdList::New(); ptIds->Allocate(12); // // sphereActor->SetPosition(picker->GetPickPosition()); // // if ( picker->GetPointId() >= 0 ) // { // cout << "Point id: " << picker->GetPointId() << "\n"; // cellsActor->VisibilityOn(); // plateActor->VisibilityOff(); // // cells->Initialize(); // cells->Allocate(100); // cells->SetPoints(plateOutput->GetPoints()); // // plateOutput->GetPointCells(picker->GetPointId(), cellIds); // for (i=0; i < cellIds->GetNumberOfIds(); i++) // { // cellId = cellIds->GetId(i); // plateOutput->GetCellPoints(cellId, ptIds); // cells->InsertNextCell(plateOutput->GetCellType(cellId), ptIds); // } // } // else // { // cellsActor->VisibilityOff(); // plateActor->VisibilityOn(); // } // // renWin->Render(); // cellIds->Delete(); // ptIds->Delete(); // } //##################################################################### #include "vtkAllLibs.h" #include "vtkActor.h" #include "vtkCamera.h" #include "vtkCellArray.h" #include "vtkFloatArray.h" #include "vtkPointData.h" #include "vtkPoints.h" #include "vtkPolyData.h" #include "vtkPolyDataMapper.h" #include "vtkRenderWindow.h" #include "vtkRenderWindowInteractor.h" #include "vtkRenderer.h" #include "vtkCommand.h" #include "vtkPropPicker.h" #include "vtkPointPicker.h" #include "vtkSphereSource.h" #include "vtkProperty.h" #include "vtkInteractorStyleImage.h" #include <stdio.h> class vtkMyCallback : public vtkCommand { public: vtkMyCallback::vtkMyCallback() { m_pvtkActorSelection = NULL; }; static vtkMyCallback *New() { return new vtkMyCallback; } void PrintSelf(ostream&, vtkIndent) { } void PrintTrailer(ostream&, vtkIndent) { } void PrintHeader(ostream&, vtkIndent) { } void CollectRevisions(ostream&) {} void SetSelectionActor(vtkActor* pvtkActorSelection) { m_pvtkActorSelection = pvtkActorSelection; }; virtual void Execute(vtkObject *caller, unsigned long, void*) { vtkRenderWindowInteractor *iren = reinterpret_cast<vtkRenderWindowInteractor*>(caller); vtkPointPicker *picker = (vtkPointPicker *)iren->GetPicker(); cout << "PointId: " << picker->GetPointId() << "\n"; if (picker->GetPointId() != -1) { if (m_pvtkActorSelection) m_pvtkActorSelection->SetPosition(picker->GetPickPosition()); iren->Render(); } } private: vtkActor* m_pvtkActorSelection; }; class vtkTransInteractorStyle : public vtkInteractorStyleImage { bool ctrldown; double mx,my,mz,oldpos[3],pickpos[3]; public: int MousePos[2]; vtkPropPicker * mPicker; vtkRenderer * mRender; static vtkTransInteractorStyle *New() { return new vtkTransInteractorStyle; } // virtual void OnLeftButtonDown(); // virtual void OnLeftButtonUp(); // virtual void OnRightButtonDown(); // virtual void OnRightButtonUp(); // virtual void OnMouseMove(); protected: vtkTransInteractorStyle() { ctrldown = false; mx = my = mz = 0; }; ~vtkTransInteractorStyle() {}; }; //void vtkTransInteractorStyle::OnLeftButtonDown() //{ // int x,y; // if (0) // { // mPicker->Pick(x,y,0,mRender); // if (mPicker->PickProp(x,y,mRender) ) // { // int r = mPicker->GetProp()->IsA("VtkImageActor"); // ctrldown = true; // mx = x; my = y; // // mPicker->GetPickPosition(pickpos); // mPicker->GetActor()->GetPosition(oldpos); // pickpos[0] = pickpos[0] - oldpos[0]; // pickpos[1] = pickpos[1] - oldpos[1]; // mz = mRender->GetZ(mx,my); // printf("Picked:%5.2f %5.2f %5.2f\0",oldpos[0],oldpos[1],oldpos[2]); // // } // } // else // vtkInteractorStyleImage::OnLeftButtonDown(); //} //voi