SelectWindowRegion
VTKExamples/Cxx/Visualization/SelectWindowRegion
Code¶
SelectWindowRegion.cxx
#include <vtkSmartPointer.h> #include <vtkCallbackCommand.h> #include <vtkCommand.h> #include <vtkImageActor.h> #include <vtkImageMapper3D.h> #include <vtkInteractorStyleRubberBand2D.h> #include <vtkJPEGReader.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> static void SelectionChangedCallbackFunction ( vtkObject* caller, long unsigned int eventId, void* clientData, void* callData ); int main(int argc, char* argv[]) { // Parse input arguments if ( argc != 2 ) { std::cout << "Required parameters: Filename" << std::endl; return EXIT_FAILURE; } std::string inputFilename = argv[1]; // Read the image vtkSmartPointer<vtkJPEGReader> jPEGReader = vtkSmartPointer<vtkJPEGReader>::New(); jPEGReader->SetFileName ( inputFilename.c_str() ); jPEGReader->Update(); // Create an actor vtkSmartPointer<vtkImageActor> actor = vtkSmartPointer<vtkImageActor>::New(); actor->GetMapper()->SetInputConnection ( jPEGReader->GetOutputPort() ); // Setup the SelectionChangedEvent callback vtkSmartPointer<vtkCallbackCommand> selectionChangedCallback = vtkSmartPointer<vtkCallbackCommand>::New(); selectionChangedCallback->SetCallback ( SelectionChangedCallbackFunction ); // Setup renderer vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor ( actor ); renderer->ResetCamera(); // Setup render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer ( renderer ); // Setup 2D interaction style vtkSmartPointer<vtkInteractorStyleRubberBand2D> style = vtkSmartPointer<vtkInteractorStyleRubberBand2D>::New(); style->AddObserver ( vtkCommand::SelectionChangedEvent, selectionChangedCallback ); // Setup render window interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetInteractorStyle ( style ); // Render and start interaction renderWindowInteractor->SetRenderWindow ( renderWindow ); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; } void SelectionChangedCallbackFunction ( vtkObject* vtkNotUsed(caller), long unsigned int vtkNotUsed(eventId), void* vtkNotUsed(clientData), void* callData ) { std::cout << "Selection changed callback" << std::endl; unsigned int* rect = reinterpret_cast<unsigned int*> ( callData ); unsigned int pos1X = rect[0]; unsigned int pos1Y = rect[1]; unsigned int pos2X = rect[2]; unsigned int pos2Y = rect[3]; std::cout << "Start x: " << pos1X << " Start y: " << pos1Y << " End x: " << pos2X << " End y: " << pos2Y << std::endl; } /* //You could override this, but then you have to reimplement the functionality. //Instead, you should use an observer void vtkInteractorStyleRubberBand2D::OnLeftButtonUp() { std::cout << "LeftButtonUp!" << std::endl; std::cout << "Start: " << this->StartPosition[0] << " " << this->StartPosition[1] << std::endl; std::cout << "End: " << this->EndPosition[0] << " " << this->EndPosition[1] << std::endl; //this->Superclass.OnLeftButtonUp(); //doesn't work InvokeEvent(vtkCommand::EndPickEvent); InvokeEvent(vtkCommand::SelectionChangedEvent); } */
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(SelectWindowRegion) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(SelectWindowRegion MACOSX_BUNDLE SelectWindowRegion.cxx) target_link_libraries(SelectWindowRegion ${VTK_LIBRARIES})
Download and Build SelectWindowRegion¶
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 SelectWindowRegion and its CMakeLists.txt file. Once the tarball SelectWindowRegion.tar has been downloaded and extracted,
cd SelectWindowRegion/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:
./SelectWindowRegion
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.