SeedWidget

Description¶

This example demonstrates how to use vtkSeedWidget, which generates (seeds) points to be placed in the scene in the locations where the user clicks.

The points can then be used for operations like connectivity, segmentation, and region growing. For an example using a custom callback where such operations can be assembled, see SeedWidgetWithCustomCallback.

Other Languages

See (Cxx)

Code¶

SeedWidget.java

import vtk.vtkRenderWindow;
import vtk.vtkActor;
import vtk.vtkNativeLibrary;
import vtk.vtkPolyDataMapper;
import vtk.vtkNamedColors;
import vtk.vtkRenderer;
import vtk.vtkRenderWindowInteractor;
import vtk.vtkSphereSource;
import vtk.vtkSeedWidget;
import vtk.vtkSeedRepresentation;
import vtk.vtkPointHandleRepresentation2D;

public class SeedWidget 
{

  //-----------------------------------------------------------------
  // 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 Actor Color
    double actorColor[] = new double[4];
    //Renderer Background Color
    double Bgcolor[] = new double[4];

    colors.GetColor("Crimson", actorColor);
    colors.GetColor("MediumAquamarine", Bgcolor);

    //Create a Sphere
    vtkSphereSource Sphere = new vtkSphereSource();
    Sphere.Update();

    //Create a Mapper and Actor
    vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
    Mapper.SetInputConnection(Sphere.GetOutputPort());

    vtkActor Actor = new vtkActor();
    Actor.SetMapper(Mapper);
    Actor.GetProperty().SetColor(actorColor);

    // 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);

    vtkPointHandleRepresentation2D HandleRep = new vtkPointHandleRepresentation2D();
    HandleRep.GetProperty().SetColor(actorColor);

    vtkSeedRepresentation WidgetRep = new vtkSeedRepresentation();
    WidgetRep.SetHandleRepresentation(HandleRep);

    // Create the seed widget
    vtkSeedWidget SeedWidget = new vtkSeedWidget();
    SeedWidget.SetInteractor(iren);
    SeedWidget.SetRepresentation(WidgetRep);

    SeedWidget.On();
    ren.AddActor(Actor);
    ren.SetBackground(Bgcolor);

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

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

  }
}