/* 
	Simple.java

	java basics, 15-19.11.1999, juhuu@katastro.fi
*/

import java.applet.Applet;
import java.awt.*;
import java.net.*;

public class follow extends Applet implements Runnable {
  Image		imageDoubleBuffer;
  Graphics	gDoubleBuffer;
  Thread	engine = null;

  int		x, y;
  int		mousex, mousey;
  boolean 	mouse_down;
  Image 	imgPic;
  double	dx, dy;

  public void init() {
      // initialize double buffering
      imageDoubleBuffer = createImage(size().width, size().height);
      gDoubleBuffer = imageDoubleBuffer.getGraphics();
      gDoubleBuffer.setColor(Color.white);
      gDoubleBuffer.fillRect(0, 0, size().width, size().height);

      mousex 	= 0;
      mousey 	= 0;

      dx 	= 0;
      dy 	= 0;

      x 	= 0;
      y 	= 0;

      mouse_down = false;

      // let's load an image

      imgPic = null;

      String sPic = "molo.gif";

      MediaTracker med = new MediaTracker(this);

      imgPic = getImage(getDocumentBase(), sPic);
      med.addImage(imgPic, 0);

      try
      {
  	  med.waitForAll();
      }	catch (InterruptedException e) {
      }
  }

//----------------------------------------------------

  public void paint(Graphics g) {

	// clear the screen

    	gDoubleBuffer.setColor(new Color(25,125,125));
    	gDoubleBuffer.fillRect(0, 0, size().width, size().height);

//kuva seuraa hiirtŠ, pehmeŠsti ja hieman jŠljessŠ.


	if (imgPic != null)
	{
		double diff;

		diff = (mousex - x);
		dx = dx + diff;
		x = (int) dx / 10;

		diff = (mousey - y);
		dy = dy + diff;
		y = (int) dy / 10;

		gDoubleBuffer.drawImage(imgPic, x, y, null);
	}

	// draw all the stuff from the double buffer to the screen

	g.drawImage(imageDoubleBuffer, 0, 0, null);				
  }


//----------------------------------------------------


  // start the applet
  public void start() {
      if (engine == null) {
          engine = new Thread(this);
          engine.start();
      }
      showStatus(getAppletInfo());
  } 

  // stop the applet
  public void stop() {
     if (engine != null && engine.isAlive())
     {
         engine.stop();
     } 
     engine = null; 
  }

  public void run()
  {                  
     while (true)
     {
         try
         {
             repaint();
             Thread.sleep(10);
         } catch (InterruptedException e) {
             stop();
         }
     }                                  
  }

  public void update(Graphics g) {    
	paint(g);
  }

  // print to the console & browserstatus
  private void print(String s) {
    System.out.println(s); 		// console
    showStatus(s);         		// browser status  
  }

//---

  public boolean mouseDown(Event e, int x, int y) {
	mouse_down = true;
	return true;  
  }

  public boolean mouseUp(Event e, int x, int y) {
	mouse_down = false;
	return true;  
  }

  public boolean mouseMove(Event e, int x, int y)
  {
	mousex = x;
	mousey = y;
	return true;  
  }

  public boolean mouseDrag(Event e, int x, int y)
  {
	mousex = x;
	mousey = y;
	return true;  
  }


//---

}