VTK/Examples/Cxx/Visualization/DisplayText

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VTK Examples Baseline Visualization TestDrawText.png

This example writes "Hello world" in the bottom left corner of the render window. The text size and color are set. There are many properties that can be set that control how the text is changed when the render window is resized, but they are not covered in this example.

DrawText.cxx

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkTextActor.h>
#include <vtkTextProperty.h>
 
int main(int, char *[])
{
  vtkSmartPointer<vtkSphereSource> sphereSource = 
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource->SetCenter ( 0.0, 0.0, 0.0 );
  sphereSource->SetRadius ( 5.0 );
  sphereSource->Update();
 
  vtkPolyData* polydata = sphereSource->GetOutput();
 
  // Create a mapper
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  mapper->SetInput ( polydata );
#else
  mapper->SetInputData ( polydata );
#endif
 
  // Create an actor
  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 );
 
  // An interactor
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow ( renderWindow );
 
  // Add the actors to the scene
  renderer->AddActor ( actor );
  renderer->SetBackground ( 1,1,1 ); // Background color white
 
  // Setup the text and add it to the window
  vtkSmartPointer<vtkTextActor> textActor = 
    vtkSmartPointer<vtkTextActor>::New();
  textActor->GetTextProperty()->SetFontSize ( 24 );
  textActor->SetPosition2 ( 10, 40 );
  renderer->AddActor2D ( textActor );
  textActor->SetInput ( "Hello world" );
  textActor->GetTextProperty()->SetColor ( 1.0,0.0,0.0 );
 
  // Render and interact
  renderWindow->Render();
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
 
PROJECT(DrawText)
 
FIND_PACKAGE(VTK REQUIRED)
INCLUDE(${VTK_USE_FILE})
 
ADD_EXECUTABLE(DrawText DrawText.cxx)
TARGET_LINK_LIBRARIES(DrawText vtkHybrid)
Retrieved from "http://batchmake.org/Wiki/VTK/Examples/Cxx/Visualization/DisplayText"
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