ImageTracerWidgetInsideContour
VTKExamples/Cxx/Widgets/ImageTracerWidgetInsideContour
Code¶
ImageTracerWidgetInsideContour.cxx
#include <vtkSmartPointer.h> #include <vtkPolygon.h> #include <vtkImageData.h> #include <vtkCallbackCommand.h> #include <vtkImageActor.h> #include <vtkImageMapper3D.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 <vtkImageCanvasSource2D.h> #include <vtkInteractorStyleImage.h> #include <vtkProperty.h> #include <vtkPolyDataToImageStencil.h> #include <vtkImageStencilToImage.h> #include <vtkPNGWriter.h> #include <vtkImageAccumulate.h> namespace { void CallbackFunction (vtkObject* caller, long unsigned int eventId, void* clientData, void* callData ); void CreateImage1(vtkImageData*); } int main(int, char *[]) { vtkSmartPointer<vtkImageData> image = vtkSmartPointer<vtkImageData>::New(); CreateImage1(image); vtkSmartPointer<vtkImageActor> actor = vtkSmartPointer<vtkImageActor>::New(); actor->GetMapper()->SetInputData(image); 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); tracer->AutoCloseOn(); renderWindow->Render(); // The observer must be added BEFORE the On() call. vtkSmartPointer<vtkCallbackCommand> callback = vtkSmartPointer<vtkCallbackCommand>::New(); callback->SetCallback(CallbackFunction); callback->SetClientData(image); tracer->AddObserver(vtkCommand::EndInteractionEvent, callback); tracer->On(); interactor->Start(); return EXIT_SUCCESS; } namespace { void CallbackFunction (vtkObject* caller, long unsigned int vtkNotUsed(eventId), void* clientData, void* vtkNotUsed(callData) ) { vtkImageTracerWidget* tracerWidget = static_cast<vtkImageTracerWidget*>(caller); vtkSmartPointer<vtkPolyData> path = vtkSmartPointer<vtkPolyData>::New(); if(!tracerWidget->IsClosed()) { std::cout << "Path not closed!" << std::endl; return; } tracerWidget->GetPath(path); std::cout << "There are " << path->GetNumberOfPoints() << " points in the path." << std::endl; vtkImageData* image = static_cast<vtkImageData*>(clientData); vtkSmartPointer<vtkPolyDataToImageStencil> polyDataToImageStencil = vtkSmartPointer<vtkPolyDataToImageStencil>::New(); polyDataToImageStencil->SetTolerance(0); polyDataToImageStencil->SetInputData(path); polyDataToImageStencil->SetOutputOrigin(image->GetOrigin()); polyDataToImageStencil->SetOutputSpacing(image->GetSpacing()); polyDataToImageStencil->SetOutputWholeExtent(image->GetExtent()); polyDataToImageStencil->Update(); vtkSmartPointer<vtkImageStencilToImage> imageStencilToImage = vtkSmartPointer<vtkImageStencilToImage>::New(); imageStencilToImage->SetInputConnection(polyDataToImageStencil->GetOutputPort()); imageStencilToImage->SetInsideValue(255); imageStencilToImage->Update(); vtkSmartPointer<vtkImageAccumulate> imageAccumulate = vtkSmartPointer<vtkImageAccumulate>::New(); imageAccumulate->SetStencilData(polyDataToImageStencil->GetOutput()); imageAccumulate->SetInputData(image); imageAccumulate->Update(); std::cout << "Voxel count: " << imageAccumulate->GetVoxelCount() << std::endl; vtkSmartPointer<vtkPNGWriter> writer = vtkSmartPointer<vtkPNGWriter>::New(); writer->SetFileName("selection.png"); writer->SetInputConnection(imageStencilToImage->GetOutputPort()); writer->Write(); } void CreateImage1(vtkImageData* image) { vtkSmartPointer<vtkImageCanvasSource2D> imageSource = vtkSmartPointer<vtkImageCanvasSource2D>::New(); imageSource->SetScalarTypeToUnsignedChar(); imageSource->SetNumberOfScalarComponents(1); imageSource->SetExtent(0, 20, 0, 50, 0, 0); imageSource->SetDrawColor(255,255,255); imageSource->FillBox(0,20,0,50); imageSource->Update(); image->ShallowCopy(imageSource->GetOutput()); } } // end anonymous namespace
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(ImageTracerWidgetInsideContour) find_package(VTK COMPONENTS vtkCommonCore vtkCommonDataModel vtkFiltersSources vtkIOImage vtkImagingSources vtkImagingStatistics vtkImagingStencil vtkInteractionStyle vtkInteractionWidgets vtkRenderingCore vtkRenderingFreeType vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping ImageTracerWidgetInsideContour: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION: ${VTK_VERSION}") if (VTK_VERSION VERSION_LESS "8.90.0") # old system include(${VTK_USE_FILE}) add_executable(ImageTracerWidgetInsideContour MACOSX_BUNDLE ImageTracerWidgetInsideContour.cxx ) target_link_libraries(ImageTracerWidgetInsideContour PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(ImageTracerWidgetInsideContour MACOSX_BUNDLE ImageTracerWidgetInsideContour.cxx ) target_link_libraries(ImageTracerWidgetInsideContour PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS ImageTracerWidgetInsideContour MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build ImageTracerWidgetInsideContour¶
Click here to download ImageTracerWidgetInsideContour and its CMakeLists.txt file. Once the tarball ImageTracerWidgetInsideContour.tar has been downloaded and extracted,
cd ImageTracerWidgetInsideContour/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:
./ImageTracerWidgetInsideContour
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.