MoveAGlyph
VTKExamples/Cxx/Interaction/MoveAGlyph
Description¶
This example allows the user to reposition a glyph. It does this by faking the interactor into thinking that a new actor (MoveActor) is the object to be interacted with. We use the array generated by glyph3D->GeneratePointIdsOn() to determine the point associated with the glyph that the user selected. A "ghost" actor of the selected glyph is generated (because all of the glyphs are part of the same actor, so they would all move together). This actor is moved, and its final position is used to update the point in the original data set.
Code¶
MoveAGlyph.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkCellPicker.h> #include <vtkSphereSource.h> #include <vtkGlyph3D.h> #include <vtkPointData.h> #include <vtkIdTypeArray.h> #include <vtkDataSetSurfaceFilter.h> #include <vtkRendererCollection.h> #include <vtkProperty.h> #include <vtkPlanes.h> #include <vtkObjectFactory.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkPolyData.h> #include <vtkPointSource.h> #include <vtkInteractorStyleTrackballActor.h> #include <vtkAreaPicker.h> #include <vtkExtractGeometry.h> #include <vtkDataSetMapper.h> #include <vtkUnstructuredGrid.h> #include <vtkVertexGlyphFilter.h> #include <vtkIdFilter.h> // Define interaction style class InteractorStyleMoveGlyph : public vtkInteractorStyleTrackballActor { public: static InteractorStyleMoveGlyph* New(); vtkTypeMacro(InteractorStyleMoveGlyph,vtkInteractorStyleTrackballActor); InteractorStyleMoveGlyph() { this->MoveSphereSource = vtkSmartPointer<vtkSphereSource>::New(); this->MoveSphereSource->SetRadius(.1); this->MoveSphereSource->Update(); this->MoveMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); this->MoveMapper->SetInputConnection(this->MoveSphereSource->GetOutputPort()); this->MoveActor = vtkSmartPointer<vtkActor>::New(); this->MoveActor->SetMapper(this->MoveMapper); //this->MoveActor->VisibilityOff(); this->Move = false; } void OnMouseMove() { if(!this->Move) { return; } vtkInteractorStyleTrackballActor::OnMouseMove(); } void OnMiddleButtonUp() { // Forward events vtkInteractorStyleTrackballActor::OnMiddleButtonUp(); this->Move = false; this->MoveActor->VisibilityOff(); this->Data->GetPoints()->SetPoint(this->SelectedPoint, this->MoveActor->GetPosition()); this->Data->Modified(); this->GetCurrentRenderer()->Render(); this->GetCurrentRenderer()->GetRenderWindow()->Render(); } void OnMiddleButtonDown() { // Forward events vtkInteractorStyleTrackballActor::OnMiddleButtonDown(); this->MoveActor->VisibilityOn(); if(static_cast<vtkCellPicker*>(this->InteractionPicker)->GetPointId() >= 0) { vtkIdType id = vtkIdTypeArray::SafeDownCast(this->GlyphData->GetPointData()->GetArray("InputPointIds")) ->GetValue(static_cast<vtkCellPicker*>(this->InteractionPicker)->GetPointId()); std::cout << "Id: " << id << std::endl; this->Move = true; this->SelectedPoint = id; double p[3]; this->Data->GetPoint(id, p); std::cout << "p: " << p[0] << " " << p[1] << " " << p[2] << std::endl; this->MoveActor->SetPosition(p); } this->GetCurrentRenderer()->AddActor(this->MoveActor); this->InteractionProp = this->MoveActor; } vtkPolyData* Data; vtkPolyData* GlyphData; vtkSmartPointer<vtkPolyDataMapper> MoveMapper; vtkSmartPointer<vtkActor> MoveActor; vtkSmartPointer<vtkSphereSource> MoveSphereSource; bool Move; vtkIdType SelectedPoint; }; vtkStandardNewMacro(InteractorStyleMoveGlyph); int main (int, char *[]) { vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->InsertNextPoint(0,0,0); points->InsertNextPoint(1,0,0); points->InsertNextPoint(2,0,0); vtkSmartPointer<vtkPolyData> input = vtkSmartPointer<vtkPolyData>::New(); input->SetPoints(points); vtkSmartPointer<vtkSphereSource> glyphSource = vtkSmartPointer<vtkSphereSource>::New(); glyphSource->SetRadius(.1); glyphSource->Update(); vtkSmartPointer<vtkGlyph3D> glyph3D = vtkSmartPointer<vtkGlyph3D>::New(); glyph3D->GeneratePointIdsOn(); glyph3D->SetSourceConnection(glyphSource->GetOutputPort()); #if VTK_MAJOR_VERSION <= 5 glyph3D->SetInputConnection(input->GetProducerPort()); #else glyph3D->SetInputData(input); #endif glyph3D->SetScaleModeToDataScalingOff(); glyph3D->Update(); // Create a mapper and actor vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(glyph3D->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // Visualize vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderer->AddActor(actor); //renderer->SetBackground(1,1,1); // Background color white renderWindow->Render(); vtkSmartPointer<InteractorStyleMoveGlyph> style = vtkSmartPointer<InteractorStyleMoveGlyph>::New(); renderWindowInteractor->SetInteractorStyle( style ); style->Data = input; style->GlyphData = glyph3D->GetOutput(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(MoveAGlyph) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(MoveAGlyph MACOSX_BUNDLE MoveAGlyph.cxx) target_link_libraries(MoveAGlyph ${VTK_LIBRARIES})
Download and Build MoveAGlyph¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download MoveAGlyph and its CMakeLists.txt file. Once the tarball MoveAGlyph.tar has been downloaded and extracted,
cd MoveAGlyph/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./MoveAGlyph
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.