//  Applet to do animation with gif's,
//  but now uses mouse to move item in image. 
//  Implemented WITH double-buffering - smooth as silk 

import java.applet.*;   		// applet classes
import java.awt.*;			// user interface classes
import java.awt.event.*;		// event handling classes
import java.lang.*;			// contains Math class
import java.io.*;

public class animate4 extends Applet {

	Image background, moose;
	Image offScreenImage;			// for double-buffering
	Graphics offScreenGraphics;		// for double-buffering

	int new_x = 50;
	int new_y = 70;

	public void paint (Graphics g) {
		int j;

		g.drawImage (background, 35, 60, this);
		g.drawImage (moose, new_x, new_y, this);

	}  // paint


	public void init () {
		int i;

		background = getImage (getDocumentBase(), "mountlogo0.gif");
		moose = getImage (getDocumentBase(), "transMoose.gif");


		// for double-buffering
		offScreenImage = createImage (getSize().width, getSize().height);
		offScreenGraphics = offScreenImage.getGraphics();


		// follow mouse (from Just Java, p. 579)
		addMouseMotionListener (new MouseMotionListener () {
			public void mouseDragged (MouseEvent e) {
				new_x = e.getX();
				new_y = e.getY();
				repaint ();
			}
			public void mouseMoved (MouseEvent e) {}
		} );

	}  // init


	// for double-buffering
	public void update (Graphics g) {
		paint (offScreenGraphics);  // paint on the buffer
		g.drawImage (offScreenImage, 0, 0, this);  // draw buffer
	}


}  // program