DrawText

Repository source: DrawText

Description¶

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.

This example draws text in 2D. For an example using 3D text that can be placed on the scene like a regular vtkActor, see VectorText.

Other languages

See (Cxx)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code¶

DrawText.java

import vtk.vtkActor;
import vtk.vtkNamedColors;
import vtk.vtkNativeLibrary;
import vtk.vtkPolyDataMapper;
import vtk.vtkRenderWindow;
import vtk.vtkRenderWindowInteractor;
import vtk.vtkRenderer;
import vtk.vtkSphereSource;
import vtk.vtkTextActor;

public class DrawText 
{
  // -----------------------------------------------------------------
  // Load VTK library and print which library was not properly loaded
  static 
  {
    if (!vtkNativeLibrary.LoadAllNativeLibraries()) 
    {
      for (vtkNativeLibrary lib : vtkNativeLibrary.values()) 
      {
        if (!lib.IsLoaded()) 
        {
          System.out.println(lib.GetLibraryName() + " not loaded");
        }
      }
    }
    vtkNativeLibrary.DisableOutputWindow(null);
  }
  // -----------------------------------------------------------------

  public static void main(String args[]) 
  {
    vtkNamedColors colors = new vtkNamedColors();

    //For textActor Color
    double textactorColor[] = new double[4];
    //Renderer Background Color
    double Bgcolor[] = new double[4];

    colors.GetColor("Tomato", textactorColor);
    colors.GetColor("White", Bgcolor);

    // Create a sphere
    vtkSphereSource sphereSource = new vtkSphereSource();
    sphereSource.SetCenter(0.0, 0.0, 0.0 );
    sphereSource.SetRadius(5.0 );
    sphereSource.Update();

    // Create a mapper
    vtkPolyDataMapper mapper = new vtkPolyDataMapper();
    mapper.SetInputData (sphereSource.GetOutput());

    vtkActor actor = new vtkActor();
    actor.SetMapper ( mapper );

    // Create the renderer, render window and interactor.
    vtkRenderer ren = new vtkRenderer();
    vtkRenderWindow renWin = new vtkRenderWindow();
    renWin.AddRenderer(ren);
    vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor();
    iren.SetRenderWindow(renWin);

    // Setup the text and add it to the renderer
    vtkTextActor textActor = new vtkTextActor();
    textActor.SetInput("Hello world");
    textActor.SetPosition2(10, 40);
    textActor.GetTextProperty().SetFontSize (24);
    textActor.GetTextProperty().SetColor (textactorColor);
    ren.AddActor2D(textActor);

    // Visualise
    ren.AddActor(actor);

    ren.SetBackground(Bgcolor);

    renWin.SetSize(300, 300);
    renWin.Render();

    iren.Initialize();
    iren.Start();
  }
}