TextWidget

VTKEx/Cxx/Widgets/TextWidget

Description

Seealso

DrawText

Other languages

See (Python), (Java)

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

TextWidget.cxx

#include <vtkSmartPointer.h>
#include <vtkTextWidget.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkTextActor.h>
#include <vtkTextProperty.h>
#include <vtkTextRepresentation.h>
#include <vtkCoordinate.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkCommand.h>

int main(int, char *[])
{
  // Create the RenderWindow, Renderer and both Actors
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);

  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);

  // Create a test pipeline
  vtkSmartPointer<vtkSphereSource> sphereSource =
    vtkSmartPointer<vtkSphereSource>::New();
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputConnection(sphereSource->GetOutputPort());
  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  // Create the widget
  vtkSmartPointer<vtkTextActor> textActor =
    vtkSmartPointer<vtkTextActor>::New();
  textActor->SetInput("This is a test");
  textActor->GetTextProperty()->SetColor( 0.0, 1.0, 0.0 );

  vtkSmartPointer<vtkTextWidget> textWidget =
    vtkSmartPointer<vtkTextWidget>::New();

  vtkSmartPointer<vtkTextRepresentation> textRepresentation =
    vtkSmartPointer<vtkTextRepresentation>::New();
  textRepresentation->GetPositionCoordinate()->SetValue( .15, .15 );
  textRepresentation->GetPosition2Coordinate()->SetValue( .7, .2 );
  textWidget ->SetRepresentation( textRepresentation );

  textWidget->SetInteractor(interactor);
  textWidget->SetTextActor(textActor);
  textWidget->SelectableOff();

  // Add the actors to the renderer, set the background and size
  renderer->AddActor(actor);
  renderer->SetBackground(0.1, 0.2, 0.4);
  renderWindow->SetSize(300, 300);

  interactor->Initialize();
  renderWindow->Render();
  textWidget->On();
  renderWindow->Render();

  interactor->Start();

  return EXIT_SUCCESS;

}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(TextWidget)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkFiltersSources
  vtkvtkInteractionStyle
  vtkvtkInteractionWidgets
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping TextWidget: ${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(TextWidget MACOSX_BUNDLE TextWidget.cxx )
  target_link_libraries(TextWidget PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(TextWidget MACOSX_BUNDLE TextWidget.cxx )
  target_link_libraries(TextWidget PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS TextWidget
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build TextWidget

Click here to download TextWidget and its CMakeLists.txt file. Once the tarball TextWidget.tar has been downloaded and extracted,

cd TextWidget/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:

./TextWidget

WINDOWS USERS

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