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# MultiLineText

VTKEx/Java/Annotation/MultiLineText

### Description

This example demonstrates the use of multiline 2D text using vtkTextMapper. It shows several justifications as well as single-line and multiple-line text inputs.

Other languages

See (Cxx), (Python)

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

MultiLineText.java

    import vtk.vtkNativeLibrary;
    import vtk.vtkTextProperty;
    import vtk.vtkTextMapper;
    import vtk.vtkActor2D;
    import vtk.vtkPoints;
    import vtk.vtkCellArray;
    import vtk.vtkNamedColors;
    import vtk.vtkCoordinate;
    import vtk.vtkPolyData;
    import vtk.vtkPolyDataMapper2D;
    import vtk.vtkRenderWindow;
    import vtk.vtkRenderWindowInteractor;
    import vtk.vtkRenderer;

    public class MultiLineText
    {
      // -----------------------------------------------------------------
      // 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 singleLineTextB Actor Color
        double singleLineTextActorBColor[] = new double[4];
        //For singleLineTextActorC Color
        double singleLineTextActorCColor[] = new double[4];
        //For singleLineTextActorT Color
        double singleLineTextActorTColor[] = new double[4];
        //For textMapperLColor
        double textMapperLColor[] = new double[4];
        //For textMapperCColor
        double textMapperCColor[] = new double[4];
        //For textMapperRColor
        double textMapperRColor[] = new double[4];
        //For gridActor
        double Grid_Actor[] = new double[4];

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

        //Change Color Name to Use your own Color to singleLineTextActorB Color
        Color.GetColor("IndianRed",singleLineTextActorBColor);
        //Change Color Name to Use your own Color to singleLineTextActorC  Color
        Color.GetColor("DarkBlue",singleLineTextActorCColor);
        //Change Color Name to Use your own Color to singleLineTextActorT  Color
        Color.GetColor("Maroon",singleLineTextActorTColor);
        //Change Color Name to Use your own Color to textMapperLColor
        Color.GetColor("Crimson",textMapperLColor);
        //Change Color Name to Use your own Color to textMapperCColor
        Color.GetColor("Black",textMapperCColor);
        //Change Color Name to Use your own Color to textMapperRColor
        Color.GetColor("Navy",textMapperRColor);
        //Change Color Name to Use your own Color to textMapperRColor
        Color.GetColor("DimGray",Grid_Actor);
        //Change Color Name to Use your own Color for Renderer Background
        Color.GetColor("BlanchedAlmond",BgColor);

        vtkTextProperty singleLineTextProp = new vtkTextProperty();
        singleLineTextProp.SetFontSize(24);
        singleLineTextProp.SetFontFamilyToArial();
        singleLineTextProp.BoldOff();
        singleLineTextProp.ItalicOff();
        singleLineTextProp.ShadowOff();

        vtkTextProperty multiLineTextProp = new vtkTextProperty();
        multiLineTextProp.ShallowCopy(singleLineTextProp);
        multiLineTextProp.BoldOn();
        multiLineTextProp.ItalicOn();
        multiLineTextProp.ShadowOn();
        multiLineTextProp.SetLineSpacing(0.8);

        vtkTextMapper singleLineTextB = new vtkTextMapper();
        singleLineTextB .SetInput("Single Line(Bottom)");
        singleLineTextB.GetTextProperty().ShallowCopy(singleLineTextProp);
        singleLineTextB.GetTextProperty().SetVerticalJustificationToBottom();
        singleLineTextB .GetTextProperty().SetColor(singleLineTextActorBColor);

        vtkActor2D singleLineTextActorB = new vtkActor2D();
        singleLineTextActorB.SetMapper(singleLineTextB);
        singleLineTextActorB.GetPositionCoordinate().SetCoordinateSystemToNormalizedDisplay();
        singleLineTextActorB.GetPositionCoordinate().SetValue(0.05, 0.85);

        vtkTextMapper singleLineTextC = new vtkTextMapper();
        singleLineTextC .SetInput("Single Line(centered)");
        singleLineTextC.GetTextProperty().ShallowCopy(singleLineTextProp);
        singleLineTextC.GetTextProperty().SetVerticalJustificationToCentered();
        singleLineTextC .GetTextProperty().SetColor(singleLineTextActorCColor);

        vtkActor2D singleLineTextActorC = new vtkActor2D();
        singleLineTextActorC.SetMapper(singleLineTextC);
        singleLineTextActorC.GetPositionCoordinate().SetCoordinateSystemToNormalizedDisplay();
        singleLineTextActorC.GetPositionCoordinate().SetValue(0.05, 0.75);

        vtkTextMapper singleLineTextT = new vtkTextMapper();
        singleLineTextT .SetInput("Single Line(Top)");
        singleLineTextT.GetTextProperty().ShallowCopy(singleLineTextProp);
        singleLineTextT.GetTextProperty().SetVerticalJustificationToTop();
        singleLineTextT .GetTextProperty().SetColor(singleLineTextActorTColor);

        vtkActor2D singleLineTextActorT = new vtkActor2D();
        singleLineTextActorT.SetMapper(singleLineTextT);
        singleLineTextActorT.GetPositionCoordinate().SetCoordinateSystemToNormalizedDisplay();
        singleLineTextActorT.GetPositionCoordinate().SetValue(0.05, 0.65);

        vtkTextMapper textMapperL = new vtkTextMapper();
        textMapperL .SetInput("This is\nmulti-line\ntext output\n(left-top)");
        textMapperL.GetTextProperty().ShallowCopy(multiLineTextProp);
        textMapperL.GetTextProperty().SetJustificationToLeft();
        textMapperL.GetTextProperty().SetVerticalJustificationToTop();
        textMapperL .GetTextProperty().SetColor(textMapperLColor);

        vtkActor2D textActorL = new vtkActor2D();
        textActorL.SetMapper(textMapperL);
        textActorL.GetPositionCoordinate().SetCoordinateSystemToNormalizedDisplay();
        textActorL.GetPositionCoordinate().SetValue(0.05, 0.5);

        vtkTextMapper textMapperC = new vtkTextMapper();
        textMapperC .SetInput("This is\nmulti-line\ntext output\n(centered)");
        textMapperC.GetTextProperty().ShallowCopy(multiLineTextProp);
        textMapperC.GetTextProperty().SetJustificationToCentered();
        textMapperC.GetTextProperty().SetVerticalJustificationToCentered();
        textMapperC .GetTextProperty().SetColor(textMapperCColor);

        vtkActor2D textActorC = new vtkActor2D();
        textActorC.SetMapper(textMapperC);
        textActorC.GetPositionCoordinate().SetCoordinateSystemToNormalizedDisplay();
        textActorC.GetPositionCoordinate().SetValue(0.5, 0.5);

        vtkTextMapper textMapperR = new vtkTextMapper();
        textMapperR .SetInput("This is\nmulti-line\ntext output\n(right-bottom)");
        textMapperR.GetTextProperty().ShallowCopy(multiLineTextProp);
        textMapperR.GetTextProperty().SetJustificationToRight();
        textMapperR.GetTextProperty().SetVerticalJustificationToBottom();
        textMapperR .GetTextProperty().SetColor(textMapperRColor);

        vtkActor2D textActorR = new vtkActor2D();
        textActorR.SetMapper(textMapperR);
        textActorR.GetPositionCoordinate().SetCoordinateSystemToNormalizedDisplay();
        textActorR.GetPositionCoordinate().SetValue(0.95, 0.5);

        vtkPoints Pts = new vtkPoints();
        Pts.InsertNextPoint(0.05, 0.0, 0.0);
        Pts.InsertNextPoint(0.05, 1.0, 0.0);
        Pts.InsertNextPoint(0.5, 0.0, 0.0);
        Pts.InsertNextPoint(0.5, 1.0, 0.0);
        Pts.InsertNextPoint(0.95, 0.0, 0.0);
        Pts.InsertNextPoint(0.95, 1.0, 0.0);
        Pts.InsertNextPoint(0.0, 0.5, 0.0);
        Pts.InsertNextPoint(1.0, 0.5, 0.0);
        Pts.InsertNextPoint(0.00, 0.85, 0.0);
        Pts.InsertNextPoint(0.50, 0.85, 0.0);
        Pts.InsertNextPoint(0.00, 0.75, 0.0);
        Pts.InsertNextPoint(0.50, 0.75, 0.0);
        Pts.InsertNextPoint(0.00, 0.65, 0.0);
        Pts.InsertNextPoint(0.50, 0.65, 0.0);

        vtkCellArray Lines = new vtkCellArray();
        Lines.InsertNextCell(2);
        Lines.InsertNextCell(0);
        Lines.InsertNextCell(1);
        Lines.InsertNextCell(2);
        Lines.InsertNextCell(2);
        Lines.InsertNextCell(3);
        Lines.InsertNextCell(2);
        Lines.InsertNextCell(4);
        Lines.InsertNextCell(5);
        Lines.InsertNextCell(2);
        Lines.InsertNextCell(6);
        Lines.InsertNextCell(7);
        Lines.InsertNextCell(2);
        Lines.InsertNextCell(8);
        Lines.InsertNextCell(9);
        Lines.InsertNextCell(2);
        Lines.InsertNextCell(10);
        Lines.InsertNextCell(11);
        Lines.InsertNextCell(2);
        Lines.InsertNextCell(12);
        Lines.InsertNextCell(13);

        vtkPolyData Grid = new vtkPolyData();
        Grid.SetPoints(Pts);
        Grid.SetLines(Lines);

        vtkCoordinate normCoords = new vtkCoordinate();
        normCoords.SetCoordinateSystemToNormalizedViewport();

        vtkPolyDataMapper2D Mapper = new vtkPolyDataMapper2D();
        Mapper.SetInputData(Grid);
        Mapper.SetTransformCoordinate(normCoords);

        vtkActor2D GridActor = new vtkActor2D();
        GridActor.SetMapper(Mapper);
        GridActor.GetProperty().SetColor(Grid_Actor);

        // 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.AddActor2D(textActorL);
        ren.AddActor2D(textActorC);
        ren.AddActor2D(textActorR);
        ren.AddActor2D(singleLineTextActorB);
        ren.AddActor2D(singleLineTextActorC);
        ren.AddActor2D(singleLineTextActorT);
        ren.AddActor2D(GridActor);
        ren.SetBackground(BgColor);

        renWin.SetSize(500,500);
        renWin.Render();

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

      }
    }