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//
// This example shows how to add an observer to a Java program. It extends
// the Step1/Java/Cone.java Java example (see that example for information on
// the basic setup).
//
// VTK uses a command/observer design pattern. That is, observers watch for
// particular events that any vtkObject (or subclass) may invoke on
// itself. For example, the vtkRenderer invokes a "StartEvent" as it begins
// to render. Here we add an observer that invokes a command when this event
// is observed.
//
//
// Show how to add an observer to the Cone example
//
// we import the vtk wrapped classes forst
import vtk.*;
// then we define our class
public class Cone2 {
// in the static contructor we load in the native code
// The libraries must be in your path to work
static {
System.loadLibrary("vtkCommonJava");
System.loadLibrary("vtkFilteringJava");
System.loadLibrary("vtkIOJava");
System.loadLibrary("vtkImagingJava");
System.loadLibrary("vtkGraphicsJava");
System.loadLibrary("vtkRenderingJava");
}
// Define the callback
public void myCallback()
{
System.out.println("Starting a render");
}
// now the main program
public static void main (String []args) {
//
// Now we create the pipeline as usual, see Cone.java in Step1 for details
//
vtkConeSource cone = new vtkConeSource();
cone.SetHeight( 3.0 );
cone.SetRadius( 1.0 );
cone.SetResolution( 10 );
vtkPolyDataMapper coneMapper = new vtkPolyDataMapper();
coneMapper.SetInputConnection( cone.GetOutputPort() );
vtkActor coneActor = new vtkActor();
coneActor.SetMapper( coneMapper );
vtkRenderer ren1 = new vtkRenderer();
ren1.AddActor( coneActor );
ren1.SetBackground( 0.1, 0.2, 0.4 );
// Add the observer here, the first argument is the event name
// the second argument is the instance to invoke the method on
// the third argument is which method to invoke
Cone2 me = new Cone2();
ren1.AddObserver("StartEvent",me,"myCallback");
// setup the window
vtkRenderWindow renWin = new vtkRenderWindow();
renWin.AddRenderer( ren1 );
renWin.SetSize( 300, 300 );
//
// now we loop over 360 degreeees and render the cone each time
//
int i;
for (i = 0; i < 360; ++i)
{
// render the image
renWin.Render();
// rotate the active camera by one degree
ren1.GetActiveCamera().Azimuth( 1 );
}
}
}
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