TextOrigin

Description¶

This example demonstrates the use of vtkVectorText and vtkFollower. vtkVectorText is used to create 3D annotation. vtkFollower is used to position the 3D text and to ensure that the text always faces the renderer's active camera (i.e., the text is always readable).

Other languages

See (Cxx), (Python)

Question

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Code¶

TextOrigin.java

import vtk.vtkNativeLibrary;
import vtk.vtkActor;
import vtk.vtkAxes;
import vtk.vtkVectorText;
import vtk.vtkPolyDataMapper;
import vtk.vtkFollower;
import vtk.vtkNamedColors;

import vtk.vtkRenderWindow;
import vtk.vtkRenderWindowInteractor;
import vtk.vtkRenderer;


public class TextOrigin  {
  // private static final long serialVersionUID = 1L;
  // -----------------------------------------------------------------
  // 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 s[]) {


    vtkNamedColors Color = new vtkNamedColors(); 

    //For Text Actor Color
    double TextActorColor[] = new double[4];
    //For Renderer Background Color
    double BgColor[] = new double[4];


    //Change Color Name to Use your own Color for Change Actor Color
    Color.GetColor("IndianRed",TextActorColor);
    //Change Color Name to Use your own Color for Renderer Background
    Color.GetColor("LightGrey",BgColor);


    // Create the axes and the associated mapper and actor.
    vtkAxes Axes = new vtkAxes();
    Axes.SetOrigin(0, 0, 0);

    vtkPolyDataMapper AxesMapper = new vtkPolyDataMapper();
    AxesMapper.SetInputConnection(Axes.GetOutputPort());

    vtkActor AxesActor = new vtkActor();
    AxesActor.SetMapper(AxesMapper);

    // Create the 3D text and the associated mapper and follower (a type of actor).  
    //Position the text so it is displayed over the origin of the axes.
    vtkVectorText aText = new vtkVectorText();
    aText.SetText("Origin");


    vtkPolyDataMapper TextMapper = new vtkPolyDataMapper();
    TextMapper.SetInputConnection(aText.GetOutputPort());


    vtkFollower TextActor = new vtkFollower();
    TextActor.SetMapper(TextMapper);
    TextActor.SetScale(0.2, 0.2, 0.2);
    TextActor.AddPosition(0, -0.1, 0);
    TextActor.GetProperty().SetColor(TextActorColor);


    // 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);

    // Visualise the arrow
    ren.AddActor(TextActor);
    ren.AddActor(AxesActor);
    ren.SetBackground(BgColor);
    ren.ResetCamera();
    ren.ResetCameraClippingRange();
    ren.GetActiveCamera().Zoom(1.6);

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

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

  }
}