ImageTracerWidget
VTKExamples/Cxx/Widgets/ImageTracerWidget
Code¶
ImageTracerWidget.cxx
#include <vtkSmartPointer.h> #include <vtkCallbackCommand.h> #include <vtkImageActor.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkPolyData.h> #include <vtkSphereSource.h> #include <vtkImageTracerWidget.h> #include <vtkImageMapper3D.h> #include <vtkImageCanvasSource2D.h> #include <vtkInteractorStyleImage.h> #include <vtkProperty.h> namespace { void CallbackFunction (vtkObject* caller, long unsigned int eventId, void* clientData, void* callData ); } int main(int, char *[]) { vtkSmartPointer<vtkImageCanvasSource2D> imageSource = vtkSmartPointer<vtkImageCanvasSource2D>::New(); imageSource->SetScalarTypeToUnsignedChar(); imageSource->SetNumberOfScalarComponents(3); imageSource->SetExtent(0, 20, 0, 50, 0, 0); imageSource->SetDrawColor(0,0,0); imageSource->FillBox(0,20,0,50); imageSource->SetDrawColor(255,0,0); imageSource->FillBox(0,10,0,30); imageSource->Update(); vtkSmartPointer<vtkImageActor> actor = vtkSmartPointer<vtkImageActor>::New(); actor->GetMapper()->SetInputConnection(imageSource->GetOutputPort()); vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(actor); renderer->ResetCamera(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); interactor->SetInteractorStyle(style); vtkSmartPointer<vtkImageTracerWidget> tracer = vtkSmartPointer<vtkImageTracerWidget>::New(); tracer->GetLineProperty()->SetLineWidth(5); tracer->SetInteractor(interactor); tracer->SetViewProp(actor); renderWindow->Render(); // The observer must be added BEFORE the On() call. vtkSmartPointer<vtkCallbackCommand> callback = vtkSmartPointer<vtkCallbackCommand>::New(); callback->SetCallback(CallbackFunction); tracer->AddObserver(vtkCommand::EndInteractionEvent, callback); tracer->On(); interactor->Start(); return EXIT_SUCCESS; } namespace { void CallbackFunction (vtkObject* caller, long unsigned int vtkNotUsed(eventId), void* vtkNotUsed(clientData), void* vtkNotUsed(callData) ) { vtkImageTracerWidget* tracerWidget = static_cast<vtkImageTracerWidget*>(caller); vtkSmartPointer<vtkPolyData> path = vtkSmartPointer<vtkPolyData>::New(); tracerWidget->GetPath(path); std::cout << "There are " << path->GetNumberOfPoints() << " points in the path." << std::endl; } } // end anonymous namespace
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageTracerWidget) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageTracerWidget MACOSX_BUNDLE ImageTracerWidget.cxx) target_link_libraries(ImageTracerWidget ${VTK_LIBRARIES})
Download and Build ImageTracerWidget¶
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 ImageTracerWidget and its CMakeLists.txt file. Once the tarball ImageTracerWidget.tar has been downloaded and extracted,
cd ImageTracerWidget/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:
./ImageTracerWidget
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.