/** Banner.java    Applet   David Fourer
  * Draws a moving text banner for a web page.  
  * Click on the banner and it stops moving.
  * Accepts the following param strings, which are optional.  Words
  * 		are not case-sensitive:
  *	text -- a string of any length (default="The Quick Brown Fox..." )
  *	typeface -- (default)Serif or SansSerif
  *	typestyle -- plain, bold, italic, (default)bold + italic 
  *	speed -- a wait time in milliseconds.  default is 25
  *	background -- "000000", red-green-blue color, hexidecimal
  *	foreground -- "000000", red-green-blue color, hexidecimal
  *
  */
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.io.*;
import java.net.URL;

public class Banner extends Applet implements Runnable, MouseListener {

	private Image buffer;
	private Graphics gc;
	private Thread animate;
	
	private String text;
	private Color backColor;					
	private Color foreColor;
	private Font font1;

	private boolean active = true;	//is running
	private int width, height;			//applet size
	private int sleepTime;
	private int bufWidth;

	int p = 0;								//position to paint start of banner

//________________________________________________________________init()____
	public void init() {
		width = getSize().width;						//applet size
		height = getSize().height;						//applet size

		getHtmlParam();
		setBackground( backColor );

												//find length of string in chosen font
		buffer = createImage( 1, 1 );
		gc = buffer.getGraphics();
		int textLength = gc.getFontMetrics( font1 ).stringWidth( text );
		int spaceLength = gc.getFontMetrics( font1 ).stringWidth( "xxx" );
		bufWidth = textLength + spaceLength;
		p = width * 3 / 4;				//position of text
		
												//creat off screen buffer and graphics context
		buffer = createImage( bufWidth, height );	
		gc = buffer.getGraphics();
		
		gc.setFont( font1 );				//font for graphics context
				
		addMouseListener( this );
	}//________________________________________________________getHtmlParam()
	public void getHtmlParam() {
		String s;

		s = getParameter( "text" );				//"text" string
		if( s == null || s.equals( "" ) )
			text = new String( "Have you fed Sarah and Esther yet?" );
		else
			text = new String( s );

		s = getParameter( "typeface" );			//"typeface" string
		String typeface = new String();
		if( s == null )
			typeface = "TimesRoman";
		else
			typeface = s;

		s = getParameter( "typestyle" );			//"typestyle" string
		int typestyle;
		if( s == null )
			typestyle = Font.ITALIC + Font.BOLD;
		else if( s.equalsIgnoreCase( "plain" ) )
			typestyle = Font.PLAIN;
		else if( s.equalsIgnoreCase( "italic" ) )
			typestyle = Font.ITALIC;
		else if( s.equalsIgnoreCase( "bold" ) )
			typestyle = Font.BOLD;
		else
			typestyle = Font.ITALIC + Font.BOLD;
		

		font1 = new Font( typeface, typestyle, height*2/3 );

		s = new String();								//"speed" integer (wait millisec)
		s = getParameter( "speed" );
			try{ sleepTime = Integer.parseInt( s ); }
			catch( NumberFormatException nfe ) { sleepTime=(-1); }
			if( sleepTime < 0 || sleepTime > 100 )
				sleepTime = 30;

												//"background" string ( rgb color, hex ) 
												//"foreground" string ( rgb color, hex )
		String webColor1 = new String();												
		String webColor2 = new String();
		webColor1 = getParameter( "background" );
		webColor2 = getParameter( "foreground" );
		if( webColor1 == null )
			webColor1 = new String( "a0c0e0" );
		if( webColor2 == null )
			webColor2 = new String( "703020" );
		try{
	backColor = new Color( Integer.parseInt( webColor1.substring( 0, 2 ), 16 ), 
								Integer.parseInt( webColor1.substring( 2, 4), 16 ),
								Integer.parseInt( webColor1.substring( 4 ), 16 ) );


	foreColor = new Color( Integer.parseInt( webColor2.substring( 0, 2 ), 16 ), 
								Integer.parseInt( webColor2.substring( 2, 4), 16 ),
								Integer.parseInt( webColor2.substring( 4 ), 16 ) );
		
		} catch( NumberFormatException nfe ) {		
			backColor = Color.white;
			foreColor = Color.blue;
		}
	}//_________________________________________________________start()  stop()  run()
	public void start() {
		active = true;
		animate = new Thread( this );
		animate.start();
	}
	public void stop() {
		active = false;									//thread dies
	}
	public void run() {
		gc.clearRect( 0, 0, bufWidth, height );
		gc.setColor( foreColor );
		gc.drawString( text, 0, height*3/4 );		//draw the text only once
		while( active ) {
			try { Thread.sleep( sleepTime ); }
			catch( InterruptedException e ) { System.out.println( e.toString() ); }
			repaint();
		}
	}
	//___________________________________________________________paint()   update()
	public void paint( Graphics g ) {
		g.drawImage( buffer, p, 0, this );
		if( p + bufWidth < width )
			g.drawImage( buffer, p + bufWidth, 0, this );
		if( p + bufWidth * 2 < width )
			g.drawImage( buffer, p + bufWidth * 2, 0, this );
		p = (p - 3) % bufWidth ;

	}
	public void update( Graphics g ) {
		paint( g );
	}
	//_________________________________________________________MouseListener methods
	public void mouseClicked( MouseEvent e ) {
	if( active )
		active = false;
	else
		start();
	}
	public void mouseReleased( MouseEvent e ) { }
	public void mouseEntered( MouseEvent e ) { }
	public void mouseExited( MouseEvent e ) { }
	public void mousePressed( MouseEvent e ) { }

}