RubberBandZoom

VTKExamples/Java/Interaction/RubberBandZoom


Description

This example demonstrates how to select a region of the window to zoom in. vtkInteractorStyleRubberBandZoom object allows the user to draw a rectangle in the render window using the left mouse button.

When the mouse button is released, the current camera zooms by an amount determined from the shorter side of the drawn rectangle.

Other Languages

See (Cxx)

Code

RubberBandZoom.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.vtkInteractorStyleRubberBandZoom;

public class RubberBandZoom 
{
  // -----------------------------------------------------------------
  // 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 colors = new vtkNamedColors();

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

    colors.GetColor("White", Bgcolor);

    vtkSphereSource Sphere = new vtkSphereSource();
    Sphere.Update();

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

    // Create an actor
    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);

    // Add the actors to the scene
    ren.AddActor(Actor);

    ren.SetBackground(Bgcolor);

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

    vtkInteractorStyleRubberBandZoom style = new vtkInteractorStyleRubberBandZoom();
    iren.SetInteractorStyle(style);

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