/***************************************************

  Program: SpaceWave.java

***************************************************/



import java.applet.Applet;
import java.awt.*;
import java.util.StringTokenizer;



public class SpaceWave extends Applet implements Runnable{

     Thread thread;
     Image  offScreenImage;
     Graphics offScreenG;

     private     int     napTime;
     private     int     pauseTime;
     private     int     numStars;
     private     double  AmpMultiplier;
     private     double  Freq;
     private     double  Amp;
	 private	 String  FontName;
	 private     int     FontSize;
     private     int     Middle;
     private     Color   bgColor;
     private     int     i, xPos;
     private     String  text[];
     private     Color   textColor[];
     private     Star    star[];
     private     Font    font;
     private     int     strNum = 0;
     private     int     Sleep = -1;
     private     int     numStrings;
     private     double     theta = 0;
     private     boolean Sleeping = false;
     private     boolean starsOn = true;
	 private int charWidth;

public void init() 
{
	
	Integer intObj;
    int     defaultNapTime = 50;
    int     defaultPauseTime = 100;
    double  defaultAmpMultiplier = 3;
    double  defaultFreq = 3;
    int     defaultNumStars = 10;
	int		defaultFontSize = 12;
	String	defaultFontName = "Courier";
    String  paramStr;


	bgColor = getColor(getParameter("bgcolor"), Color.black);
	setBackground(bgColor);
	
	if (getParameter("stars").equals("off"))
		starsOn = false;

	text = new String[15];
	for (i = 0; i < 11; i++)
		text[i] = getParameter("text" + (i+1));

	if (text[0] == null)
	{
		text[0] = "SpaceWave was written by Bill Oatman";
		numStrings = 1;
	}
	else
		for (i = 0; i < 11; i++)
			if (text[i] != null)
				numStrings = i+1;  

	textColor = new Color[15];
	textColor[0] = new Color(0,255,0);	  textColor[1] = new Color(255,0,0);
	textColor[2] = new Color(0,0,255);	  textColor[3] = new Color(255,0,255);
	textColor[4] = new Color(0,255,255);  textColor[5] = new Color(255,255,255);
	textColor[6] = new Color(128,0,0);	  textColor[7] = new Color(0,0,128);
	textColor[8] = new Color(0,128,0);	  textColor[9] = new Color(128,128,0);
	textColor[10] = new Color(0,128,128);	
	
	try {
	    intObj = new Integer(getParameter("naptime"));
	    napTime = intObj.intValue();
	} catch (Exception e) {	    
		napTime = defaultNapTime;	
	}
	
	try {
	    intObj = new Integer(getParameter("pausetime"));
	    pauseTime = intObj.intValue();
	} catch (Exception e) {
	    pauseTime = defaultPauseTime;
	}
	
	try {
	    intObj = new Integer(getParameter("numstars"));
	    numStars = intObj.intValue();
	} catch (Exception e) {
	    numStars = defaultNumStars;
	}

	try {
	    intObj = new Integer(getParameter("ampmultiplier"));
	    AmpMultiplier = intObj.intValue();
	} catch (Exception e) {
	    AmpMultiplier = defaultAmpMultiplier;
	}

	try {
	    intObj = new Integer(getParameter("frequency"));
	    Freq = intObj.intValue();
	} catch (Exception e) {
	    Freq = defaultFreq;
	}

	try {
	    intObj = new Integer(getParameter("fontsize"));
	    FontSize = intObj.intValue();
	} catch (Exception e) {
	    FontSize = defaultFontSize;
	}

	FontName = getParameter("fontname");
	if (FontName == null)
	{
		FontName = defaultFontName;
	}

	star = new Star[numStars];
	for (i = 0; i < numStars; i++)
		star[i] = new Star(this.size().height, this.size().width);
	
	offScreenImage = createImage(this.size().width, this.size().height);
	offScreenG = offScreenImage.getGraphics();
	offScreenG.setColor(bgColor);
	offScreenG.fillRect(0,0,this.size().width, this.size().height);
	font = new Font(FontName, Font.BOLD, FontSize);
	offScreenG.setFont(font);
	charWidth = offScreenG.getFontMetrics().charWidth('a');
	xPos = this.size().width;
	Amp = this.size().height / AmpMultiplier;
	Middle = this.size().height / 2 +3 ;
}

	
	
private Color getColor(String c, Color defaultColor)
{
	Color temp;

	if (c == null)
		temp = defaultColor;
	else try {
		temp = new Color(Integer.parseInt(c, 16));
	}
	catch (NumberFormatException e) {
		temp = defaultColor;
	}
	return temp;
}


public void paint(Graphics g)
{
	g.drawImage(offScreenImage,0,0,this);
} 
    
    
  
public void update(Graphics g)
{
		int i, x, y;
		int cWidth;
		int initOffset;
		int xoffset;
		char data[];
		data = new char[255];
		String s;
		offScreenG.setColor(bgColor);
		offScreenG.fillRect(0,0,this.size().width, this.size().height);
		if (starsOn) 
			for (i = 0; i < numStars; i++)
				star[i].Update(offScreenG);


		offScreenG.setColor(textColor[strNum]);
		initOffset = xPos;
		xoffset = xPos;
		for (i = 0; i < text[strNum].length(); i++)
		{
			xoffset += charWidth + 1;
			if ((xoffset > 0) && (xoffset < this.size().width))
			{
				y = (int)(Amp * (Math.sin((double)((i+theta)/Freq))) + Middle);
				data[0] = text[strNum].charAt(i);
				offScreenG.drawChars(data, 0, 1,xoffset,y);
			}
		}
		paint(g);
		theta += 0.4;

		if (Sleeping)
		{
			Sleep--;	
			if (Sleep < 1)
			{
				Sleeping = false;
				xPos -= 2;
				initOffset -= 2;
			}
		}
		else
			xPos -= 2;

		
		if (!Sleeping)
			if ( Math.abs(  (initOffset+xoffset)/2 - (this.size().width/2)) <2)
			{
				Sleep = pauseTime;
				Sleeping = true;
			}
		
		if (xoffset < 0)
		{
			xPos = this.size().width;
			Sleeping = false;
			strNum++;
			if (strNum == numStrings)
				strNum = 0;
		}
}
	
public void start() 
{
	if (thread == null) 
	{
		thread = new Thread(this);
		thread.start();
	}
}

public void run()
{
	while (thread != null)
	{
		repaint();
		try	{ Thread.sleep(napTime); }
		catch (Exception e) {}
	}
}

public void stop() {	thread = null; }
public void destroy() {}

}