// Example applet illustrating sending/receiving of events and registering
// of callbacks on EventOuts.

import java.awt.*;
import java.applet.*;
import vrml.external.field.EventOut;
import vrml.external.field.EventInSFColor;
import vrml.external.field.EventOutSFColor;
import vrml.external.field.EventOutSFTime;
import vrml.external.field.EventOutObserver;
import vrml.external.Node;
import vrml.external.Browser;
import vrml.external.exception.*;
import netscape.javascript.JSObject;

public class RGBTest extends Applet implements EventOutObserver {
  TextArea output = null;
  Browser browser = null;
  Node material = null;
  EventInSFColor diffuseColor = null;
  EventOutSFColor outputColor = null;
  EventOutSFTime touchTime = null;
  boolean error = false;

  public void init() {
    add(new Button("Red"));
    add(new Button("Green"));
    add(new Button("Blue"));
    output = new TextArea(5, 40);
    add(output);

    JSObject win = JSObject.getWindow(this);
    JSObject doc = (JSObject) win.getMember("document");
    JSObject embeds = (JSObject) doc.getMember("embeds");
    browser = (Browser) embeds.getSlot(0);

    // Now we've got the handle to the VRML Browser.
    try {
      // Get the material node...
      material = browser.getNode("MAT");
      // Get the diffuseColor EventIn
      diffuseColor = (EventInSFColor) material.getEventIn("set_diffuseColor");
      // Get the Touch Sensor
      Node sensor = browser.getNode("TOUCH");
      // Get its touchTime EventOut
      touchTime = (EventOutSFTime) sensor.getEventOut("touchTime");
      // Set up the callback
      touchTime.advise(this, new Integer(1));
      // Get its diffuseColor EventOut
      outputColor = (EventOutSFColor) material.getEventOut("diffuseColor");
      // Set up its callback
      outputColor.advise(this, new Integer(2));
    }
    catch (InvalidNodeException ne) {
      add(new TextField("Failed to get node:" + ne));
      error = true;
    }
    catch (InvalidEventInException ee) {
      add(new TextField("Failed to get EventIn:" + ee));
      error = true;
    }
    catch (InvalidEventOutException ee) {
      add(new TextField("Failed to get EventOut:" + ee));
      error = true;
    }
  }
  
  public void callback(EventOut who, double when, Object which) {
    Integer whichNum = (Integer) which;
    if (whichNum.intValue() == 1) {
      // Make the timestamp and new time show up in the textarea.
      double val = touchTime.getValue();
      output.appendText("Got time " + val + " at time " + when + "\n");
    }
    if (whichNum.intValue() == 2) {
      // Make the new color of the sphere and timestamp
      // show up in the textarea.
      float[] val = outputColor.getValue();
      output.appendText("Got color " + val[0] + ", " + val[1] + ", " +
			val[2] + " at time " + when + "\n");
    }
  }

  public boolean action(Event event, Object what) {
    if (error)
      {
	showStatus("Problems! Had an error during initialization");
	return true;  // Uh oh...
      }
    if (event.target instanceof Button)
      {
        Button b = (Button) event.target;
        if (b.getLabel() == "Red")
  	{
	  showStatus ("Red!");
	  float[] val = new float[3];
	  val[0] = 0.8f;
	  val[1] = 0.2f;
	  val[2] = 0.2f;
	  diffuseColor.setValue(val);
  	}
        else if (b.getLabel() == "Green")
  	{
	  showStatus("Green!");
	  float[] val = new float[3];
	  val[0] = 0.2f;
	  val[1] = 0.8f;
	  val[2] = 0.2f;
	  diffuseColor.setValue(val);
  	}
        else if (b.getLabel() == "Blue")
  	{
	  showStatus("Blue!");
	  float[] val = new float[3];
	  val[0] = 0.2f;
	  val[1] = 0.2f;
	  val[2] = 0.8f;
	  diffuseColor.setValue(val);
  	}
      }
    return true;
  }
}