// GetNodeInfoS.java:   Applet to control the Get Node Info demo
// inspired by the descent applet ../descent/*
// Daniel.Schneider@tecfa.unige.ch  2/98
// hmm actually this applet doesn't do anything of interest besides
// demoing how to to retrieve information from a VRML node.
// The GetNodeInfo.java applet will add some usefule error checking to this.

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

import vrml.external.field.*;
import vrml.external.Node;
import vrml.external.Browser;
import vrml.external.exception.*;


public class GetNodeInfoS extends Applet implements ActionListener{

  // The Browser
  Browser browser = null;
  
  // Various UI widgets
  Button getInfoButton;
  TextArea output = null;
  
  // Various stuff in the VRML scene we hang on to
  Node entryVP = null;
  EventOutSFVec3f positionVP = null;
  EventOutSFRotation orientationVP = null;

  // Variables to store current position and orientation
  float[] currentPosition;
  float[] currentOrientation;
  
  /** Initialize the Applet */
  public void init() {
    
    // Connect to the browser
    browser = Browser.getBrowser(this);
    
    // Add the output pane and the button to the Java Panel
    output = new TextArea(5, 60);
    add(output);
    add (getInfoButton = new Button("Where Am I ?"));
    // register the button for event handling
    getInfoButton.addActionListener(this);

    // Initialize some VRML stuff
    initScene();

  }
  

  /** Get reference to stuff in the VRML scene */
  public void initScene() {
    
    // Get the ViewPoints
    entryVP = browser.getNode("Entry");
    System.out.println("ViewPoint Node " + entryVP + " found.");
    positionVP = (EventOutSFVec3f) entryVP.getEventOut("position_changed");
    orientationVP = (EventOutSFRotation) entryVP.getEventOut("orientation_changed");
  }
  
  /** Handle actions from AWT widgets */
    public void actionPerformed (ActionEvent event) {
	Object clickedButton = event.getSource();
	if (clickedButton == getInfoButton) {
	    currentPosition = positionVP.getValue();
	    currentOrientation = orientationVP.getValue();
	    output.append("Entry ViewPoint is at" +
			      " x=" + currentPosition [0] +
			      " y=" + currentPosition [1] +
			      " z=" + currentPosition [2] + "\n");
	    output.append("Entry Viewpoint Orientation is" +
			      " x=" + currentOrientation [0] +
			      " y=" + currentOrientation [1] +
			      " z=" + currentOrientation [2] +
			      " angle=" + currentOrientation [3] + "\n");
	}
    }
}