/**************************************************************
        END OF THE WORLD PRODUCTION
        COPYRIGHT (C) 1997, PARTICLE

        Permission to use & distribute for FREE if
        and only if some credit is given to Particle.

        I AM NOT RESPONSIBLE FOR ANYTHING

        -- Particle --
***************************************************************/

import java.applet.*;
import java.awt.*;
import java.lang.*;
import java.util.*;

public class scroll extends Applet implements Runnable
{
        /* thread support */
        Thread	myStringThread = null;

        /* out work place where we'll be drawing stuff */
        private Graphics secondGraphics=null;

        /* imagine, to be associated with out workplace, (secondGraphics) */
        private Image double_buffer=null;

        /* the message to be scrolled */
        private String MyMessage=null;

        /* the font for the message */
	private Font messageFont=null;

        /* the length of the message in pixels */
        private int messageLength;

        /* the message current X, and Y position */
        private int messageX,messageY;

        /* the speed with whitch the message scrolls */
        private int messageSpeed;

        /* the width and height of the applet */
        private int width,height;

        /* fontsize of the message in pixels */
        private int fontsize;

        /* colors for foreground, background, and shadow (secondfgcolor).*/
        Color bgcolor=null,fgcolor=null,secondfgcolor=null;

        /* The String name of the font to be used */
        String myfont=null;

/**************************************************************
get some applet info
***************************************************************/
public String getAppletInfo(){
	return (String)"Copyright (c) 1997, Particle";
}

/**************************************************************
get some applet parameter info
***************************************************************/
public String[][] getParameterInfo(){
	String pinfo[][]= {
	{"string","String","The message to be scrolled"},
	{"width","int","The width of virtual scrolling window"},
	{"height","int","The height of virtual scrolling window"},
	{"font","Font","The Font to be used"},
	{"fontsize","int","The size of the font"},
	{"fgcolor","000000 - FFFFFF","Color to be used for forground, (text)"},
	{"shadowcolor","000000 - FFFFFF","Color to be used as shadow of text"},
	{"bgcolor","000000 - FFFFFF","Color to be used for background"},
	{"speed","int","The speed with whitch to scroll the message"}};
	
	return pinfo;
}

/***************************************************************
Initialize the applet, get it ready to run.
****************************************************************/
public void init(){
                /* temp String to help extract parameters */
        String parameterGot = null;

                /* for what each parameter does, see
                the getParameterInfo() function */

        if((MyMessage=getParameter("string"))==null)
		MyMessage="Use the \"string\" parameter to specify a string";

        if((myfont=getParameter("font"))==null)
                myfont="Arial, Verdana, Helvetica";

        if((parameterGot=getParameter("width"))==null)
                width = 400;
        else    width = Integer.valueOf(parameterGot,10).intValue();

        if((parameterGot=getParameter("height"))==null)
             height = 25;
        else height=Integer.valueOf(parameterGot,10).intValue();

        if((parameterGot=getParameter("speed"))==null)
             messageSpeed = 2;
        else messageSpeed=Integer.valueOf(parameterGot,10).intValue();

        if((parameterGot=getParameter("fgcolor"))==null)
             fgcolor = Color.black;
        else fgcolor=new Color(Integer.valueOf(parameterGot,16).intValue());

        if((parameterGot=getParameter("bgcolor"))==null)
             bgcolor = Color.white;
        else bgcolor=new Color(Integer.valueOf(parameterGot,16).intValue());

        if((parameterGot=getParameter("shadowcolor"))==null)
             secondfgcolor = Color.white;
        else secondfgcolor=
                new Color(Integer.valueOf(parameterGot,16).intValue());

        if((parameterGot=getParameter("fontsize"))==null)
                fontsize = 20;
        else    fontsize = Integer.parseInt(parameterGot);

        messageY=fontsize;

                /* resize it to exactly that size */
        resize(width,height);

                /* create new font, of fontsize */
        messageFont=new Font(myfont,Font.BOLD,fontsize);

                /* get the length of the message in pixels */
	FontMetrics messageFontSize=getFontMetrics(messageFont);
	messageLength=messageFontSize.stringWidth(MyMessage);	
		
        messageX=width;
	
                /* create an Image, and associated with
                out work place graphics object */
        double_buffer = createImage(width,height);
	secondGraphics = double_buffer.getGraphics();

                /* set the font in out work place graphics */
        secondGraphics.setFont(messageFont);

                /* set the applet's foreground and background
                colors.  we don't want it to flicker.. do we? */
        setBackground(bgcolor);
        setForeground(fgcolor);
}

/******************************************************************
start the applet's thread
*******************************************************************/
public void start(){
		if (myStringThread == null){
                       //checks for previous instances...
			myStringThread = new Thread(this);
			myStringThread.start();
		}	
}

/******************************************************************
stop the thread
*******************************************************************/
public void stop(){
		if (myStringThread != null){
			myStringThread.stop();
			myStringThread = null;
		}
}


public void paint(Graphics g){
	        /* start by drawing out work place
                        to the actual physical graphics screen */
                g.drawImage(double_buffer,0,0,this);
}

/**
 * just call paint(Graphics);
 */
public void update(Graphics g){
        paint(g); 
}

/******************************************************************
the main function, it will "run" the applet
        * it is very important that this function
        is synchronized, otherwise, we could
        only run 1 applet at a time.
        * This function never releases the graphics
        of the applet.  thus, it never flickers.
        (flickering is a bad thing).  and because
        it's synchronized, we don't have to worry
        about releasing ...
*******************************************************************/
public synchronized void run(){
                /* do forever */
        while(true){
                        /* move the message: right->left */
                messageX-=messageSpeed;
                if  ((messageX+messageLength) < 0)
                        messageX = width;

                        /* set background color of out work place */
                secondGraphics.setColor(bgcolor);

                        /* clear the current contents of out workplace */
                secondGraphics.fillRect(0,0,messageLength+2,height);

                        /* set the shadow color */
                secondGraphics.setColor(secondfgcolor);

                        /* draw the shadow */
                secondGraphics.drawString(MyMessage,messageX+1,messageY);

                        /* set the text color */
                secondGraphics.setColor(fgcolor);

                        /* draw the text, (will erase most of the shadow,
                        but the shadow will still be visible by 1 pixel */
                secondGraphics.drawString(MyMessage,messageX,messageY-1);

			repaint();
                        /* let time go by... */
                try{
                        Thread.sleep(15);
                }
                        /* if anything goes wrong, stop() the thread */
                catch (InterruptedException e){
                        stop();
                }
        }
   }
}

/***************************************************************************
        END OF THE WORLD PRODUCTION
        COPYRIGHT (C) 1997, PARTICLE
****************************************************************************/