BalloonWidget
VTKExamples/Cxx/Widgets/BalloonWidget
Description¶
This example creates a sphere and a regular polygon. The balloon text describes each object when you hover over it.
Code¶
BalloonWidget.cxx
#include <vtkActor.h> #include <vtkBalloonRepresentation.h> #include <vtkBalloonWidget.h> #include <vtkCommand.h> #include <vtkInteractorStyleTrackball.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkPolyData.h> #include <vtkPolyDataMapper.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkRegularPolygonSource.h> int main (int, char *[]) { // Sphere vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetCenter(-4.0, 0.0, 0.0); sphereSource->SetRadius(4.0); sphereSource->Update(); vtkSmartPointer<vtkPolyDataMapper> sphereMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); sphereMapper->SetInputConnection(sphereSource->GetOutputPort()); vtkSmartPointer<vtkActor> sphereActor = vtkSmartPointer<vtkActor>::New(); sphereActor->SetMapper(sphereMapper); // Regular Polygon vtkSmartPointer<vtkRegularPolygonSource> regularPolygonSource = vtkSmartPointer<vtkRegularPolygonSource>::New(); regularPolygonSource->SetCenter(4.0, 0.0, 0.0); regularPolygonSource->SetRadius(4.0); regularPolygonSource->Update(); vtkSmartPointer<vtkPolyDataMapper> regularPolygonMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); regularPolygonMapper->SetInputConnection(regularPolygonSource->GetOutputPort()); vtkSmartPointer<vtkActor> regularPolygonActor = vtkSmartPointer<vtkActor>::New(); regularPolygonActor->SetMapper(regularPolygonMapper); // A renderer and render window vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); // An interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); // Create the widget vtkSmartPointer<vtkBalloonRepresentation> balloonRep = vtkSmartPointer<vtkBalloonRepresentation>::New(); balloonRep->SetBalloonLayoutToImageRight(); vtkSmartPointer<vtkBalloonWidget> balloonWidget = vtkSmartPointer<vtkBalloonWidget>::New(); balloonWidget->SetInteractor(renderWindowInteractor); balloonWidget->SetRepresentation(balloonRep); balloonWidget->AddBalloon(sphereActor, "This is a sphere",NULL); balloonWidget->AddBalloon(regularPolygonActor, "This is a regular polygon",NULL); // Add the actors to the scene renderer->AddActor(sphereActor); renderer->AddActor(regularPolygonActor); // Render renderWindow->Render(); balloonWidget->EnabledOn(); // Begin mouse interaction renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(BalloonWidget) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(BalloonWidget MACOSX_BUNDLE BalloonWidget.cxx) target_link_libraries(BalloonWidget ${VTK_LIBRARIES})
Download and Build BalloonWidget¶
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 BalloonWidget and its CMakeLists.txt file. Once the tarball BalloonWidget.tar has been downloaded and extracted,
cd BalloonWidget/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:
./BalloonWidget
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.