/**
	Company:		Shout3D LLC
	Project:		Shout3D 2.0 Sample Code
	Class:			SpriteEffect
	Date:			March 23, 2000
	Description:	A simple example of a PostRenderEffect that displays a sprite over the scene
	(C) Copyright Shout3D LLC. - 1997-2001 - All rights reserved
 */

package custom_nodes;

import shout3d.core.*;
import shout3d.*;
import java.awt.*;
import java.applet.*;
import java.net.*;

/**
 * SpriteEffect
 *
 * @author Jim Stewartson
 * @author Paul Isaacs
 */

public class SpriteEffect extends PostRenderEffect implements FieldObserver{

	public final StringField	 imageUrl			= new StringField(		this, "imageUrl",		Field.ANY,				"");
	final public IntField		 xPosition			= new IntField(			this, "xPosition",		Field.NON_NEGATIVE_INT,	0);
	final public IntField		 yPosition			= new IntField(			this, "yPosition",		Field.NON_NEGATIVE_INT,	0);
	final public BooleanField	 centered			= new BooleanField(		this, "centered",		Field.ANY,	false);


	/**
	 * Constructs a default SpriteEffect node.
	 * NOTE: imageUrl is relative to directory in which model file is contained.
	 */
	public SpriteEffect() {
		imageUrl.addFieldObserver(this, null);
	}

	public void onFieldChange(Field f, Object userData) {
		if (f == imageUrl) getImage();
	}

	Image image;
	protected void getImage() {
		if (getViewer() instanceof Applet) {
			try{
				// getCurrentBaseURL() returns the directory in which the model file is located.
				URL myURL = new URL(getViewer().getResourceListener().getCurrentBaseURL(), imageUrl.getValue());
				Applet applet = (Applet)getViewer();
				image = applet.getImage(myURL);
			}
			catch(Exception e) {
				e.printStackTrace();
			}
		}
	}

	public void filter(Graphics offScreenGraphics, int surface_pixel_bits[], float z_buffer[], int deviceWidth, int deviceHeight) {
		if (image != null) {
			int x = xPosition.getValue();
			int y = yPosition.getValue();
			if (centered.getValue()){
				x -= image.getWidth(null)/2;
				y -= image.getHeight(null)/2;
			}
			offScreenGraphics.drawImage(image, x, y, null);
		}
    }

}