LogoWidget

VTKExamples/Java/Widgets/LogoWidget


Description

vtkLogoWidget object provides support for interactively displaying and manipulating a logo.

Logos are defined by an image and vtkLogoWidget allows you to interactively place and resize the image logo.

To use this widget, simply create a vtkLogoRepresentation and associate it with the vtkLogoWidget. Turn the widget on before the render. Otherwise, it won't appear until you interact with the scene.

Other Languages

See (Cxx)

Code

LogoWidget.java

import vtk.vtkNamedColors;
import vtk.vtkNativeLibrary;
import vtk.vtkRenderWindow;
import vtk.vtkRenderWindowInteractor;
import vtk.vtkRenderer;
import vtk.vtkSphereSource;
import vtk.vtkPolyDataMapper;
import vtk.vtkActor;
import vtk.vtkImageCanvasSource2D;
import vtk.vtkLogoRepresentation;
import vtk.vtkLogoWidget;  

public class LogoWidget
{
  // -----------------------------------------------------------------
  // 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(); 

    //Renderer Background Color
    double Bgcolor[] = new double[] {0.2, 0.3, 0.4}; 

    //A sphere
    vtkSphereSource sphereSource = new vtkSphereSource();
    sphereSource.SetCenter(0.0, 0.0, 0.0);
    sphereSource.SetRadius(4.0);
    sphereSource.SetPhiResolution(4);
    sphereSource.SetThetaResolution(8);
    sphereSource.Update();

    vtkPolyDataMapper mapper = new vtkPolyDataMapper();
    mapper.SetInputConnection(sphereSource.GetOutputPort());

    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);

    //Create an image
    vtkImageCanvasSource2D drawing = new vtkImageCanvasSource2D();
    drawing.SetScalarTypeToUnsignedChar();
    drawing.SetNumberOfScalarComponents(3);
    drawing.SetExtent(0,200,0,200,0,0);

    //Clear the image
    // Note: SetDrawColour() uses double values of the rgb colors in the
    //       range [0 ... 255]
    //       So SetDrawColour(255, 255, 255) is white.
    drawing.SetDrawColor(255, 127, 100);
    drawing.FillBox(0,200,0,200);
    drawing.SetDrawColor(0, 0, 0);
    drawing.DrawCircle(100, 100, 50);
    drawing.Update();

    vtkLogoRepresentation logoRepresentation = new vtkLogoRepresentation();
    logoRepresentation.SetImage(drawing.GetOutput());
    logoRepresentation.SetPosition(0,0);
    logoRepresentation.SetPosition2(.4, .4);
    logoRepresentation.GetImageProperty().SetOpacity(.7);

    vtkLogoWidget logoWidget = new vtkLogoWidget();
    logoWidget.SetInteractor(iren);
    logoWidget.SetRepresentation(logoRepresentation);
    logoWidget.On();

    ren.SetBackground(Bgcolor);
    ren.AddActor(actor);
    renWin.SetSize(300,300);
    renWin.Render();

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