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.

Note

This original source code for this example is here.

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

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

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.