/* 
	Simple.java

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

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

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

  int		x, y;
  int		sign;
  int		mousex, mousey;
  boolean 	mouse_down;
  Image 	imgPic;
  Image 	imgBackground;


  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;

      x 	= 0;
      y 	= 0;

      sign	= 1;

      mouse_down = false;

      // let's load an image

      imgPic = null;

      String sBackground = "background.jpg";
      String sPic = "test.gif";

      MediaTracker med = new MediaTracker(this);

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

      imgBackground = getImage(getDocumentBase(), sBackground);
      med.addImage(imgBackground, 1);

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

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

  public void paint(Graphics g) {

	// clear the screen

//    	gDoubleBuffer.setColor(Color.white);
//    	gDoubleBuffer.fillRect(0, 0, size().width, size().height);

	if (imgBackground != null)
	{
		gDoubleBuffer.drawImage(imgBackground, 0, 0, null);

		if (imgPic != null)
		{
			gDoubleBuffer.drawImage(imgPic, mousex + x, mousey + y, null);
			x = x + 2 * sign;

			if (x > 50)
			{
				sign = -1;
			} else if (x < -50) {
				sign = 1;
			}
		}
	}


	// 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;  
  }


//---

}