LineWidget2
VTKExamples/Cxx/Widgets/LineWidget2
Code¶
LineWidget2.cxx
#include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkPolyData.h> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkLineWidget2.h> #include <vtkLineRepresentation.h> #include <vtkCommand.h> // This does the actual work. // Callback for the interaction class vtkLineCallback : public vtkCommand { public: static vtkLineCallback *New() { return new vtkLineCallback; } virtual void Execute(vtkObject *caller, unsigned long, void*) { vtkLineWidget2 *lineWidget = reinterpret_cast<vtkLineWidget2*>(caller); // Get the actual box coordinates of the line vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New(); static_cast<vtkLineRepresentation*>(lineWidget->GetRepresentation())->GetPolyData (polydata); // Display one of the points, just so we know it's working double p[3]; polydata->GetPoint(0,p); std::cout << "P: " << p[0] << " " << p[1] << " " << p[2] << std::endl; } vtkLineCallback(){} }; int main(int, char *[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->Update(); // Create a mapper and actor vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(sphereSource->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // A renderer and render window vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); //renderer->AddActor(actor); // An interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); vtkSmartPointer<vtkLineWidget2> lineWidget = vtkSmartPointer<vtkLineWidget2>::New(); lineWidget->SetInteractor(renderWindowInteractor); lineWidget->CreateDefaultRepresentation(); // You could do this if you want to set properties at this point: //vtkSmartPointer<vtkLineRepresentation> lineRepresentation = //vtkSmartPointer<vtkLineRepresentation>::New(); //lineWidget->SetRepresentation(lineRepresentation); vtkSmartPointer<vtkLineCallback> lineCallback = vtkSmartPointer<vtkLineCallback>::New(); lineWidget->AddObserver(vtkCommand::InteractionEvent,lineCallback); // Render renderWindow->Render(); renderWindowInteractor->Initialize(); renderWindow->Render(); lineWidget->On(); // Begin mouse interaction renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(LineWidget2) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(LineWidget2 MACOSX_BUNDLE LineWidget2.cxx) target_link_libraries(LineWidget2 ${VTK_LIBRARIES})
Download and Build LineWidget2¶
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 LineWidget2 and its CMakeLists.txt file. Once the tarball LineWidget2.tar has been downloaded and extracted,
cd LineWidget2/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:
./LineWidget2
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.