import java.applet.Applet;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
public class Life extends Applet implements MouseListener, MouseMotionListener, Runnable, ImageObserver
{
    private Point clickPoint = null;
    private static final int RADIUS = 7;
    private cellsclass cells;
    private Thread lifethread;
    private byte paused = 1;
    private Image cellpic;
    public void init() {
    	addMouseListener(this);
    	addMouseMotionListener(this);    	
    	cells = new cellsclass(getSize().width-140, getSize().height);    	
    }
    
	public void start() {
		cellpic = createImage(cells.width,cells.height);
        if (lifethread == null) {
        	lifethread = new Thread(this, "life");
        	lifethread.setPriority(Thread.MIN_PRIORITY);
        	lifethread.start();
        }
    }
    public void run() {
        Thread myThread = Thread.currentThread();
        while (lifethread == myThread) 
        {
        	if(paused == 0)
        	{
        		cells.doframe();
        		repaint();
        	}
        }
    }
    
	public void stop() {
        lifethread = null;
    }

    public void paint(Graphics g)
    {
    	update(g);
    }
    public void update(Graphics g) 
    {
        int x, y;
        Graphics g2;
    	g2 = cellpic.getGraphics();
    	g2.setColor(new Color(0, 0, 96));
    	g2.fillRect(0,0,cells.width,cells.height);
    	g2.setColor(new Color(0, 192, 0));
   		for(x = 0; x < cells.width; x++)
   			for(y = 0; y < cells.height; y++)
   			{
    			if(cells.thisframe[x][y] > 0)
    			{
    				g2.drawLine(x,y,x,y);
    			}
    			
    		}
    	g2.dispose();
    	g.drawImage(cellpic,0,0,new Color(0, 0, 96),this);
    	
    	g.setColor(new Color(0, 0, 0));
    	g.fillRect(cells.width,0,getSize().width,getSize().height);
    	g.setColor(new Color(255, 255, 255));
    	g.drawString("Options:", cells.width + 2, 15);
    	g.drawString("No. Touching", cells.width + 2, 30);
    	g.drawString("Action", cells.width + 82, 30);
    	g.drawString("0", cells.width + 2, 45);
    	g.drawString("1", cells.width + 2, 60);
    	g.drawString("2", cells.width + 2, 75);
    	g.drawString("3", cells.width + 2, 90);
    	g.drawString("4", cells.width + 2, 105);
    	g.setColor(new Color(0, 192, 0));
    	for(y = 0; y < 5; y++)
    	{
    		if(cells.rule[y] == 0)
    			g.drawString("None", cells.width + 82, 45+15*y);
    		if(cells.rule[y] == 1)
    			g.drawString("Reproduce", cells.width + 82, 45+15*y);
    		if(cells.rule[y] == 2)
    			g.drawString("Die", cells.width + 82, 45+15*y);
    	}
    	g.setColor(new Color(255, 255, 255));
    	if(cells.type == 1)
    		g.drawString("Cell type 1", cells.width + 2, 130);
    	else
    		g.drawString("Cell type 2", cells.width + 2, 130);
    	if(paused == 1)
    		g.drawString("Unpause", cells.width + 2, 150);
    	else
    		g.drawString("Pause", cells.width + 2, 150);
    }
    
    public void mousePressed(MouseEvent event) 
    {
        int ruleno;
        clickPoint = event.getPoint();
        if(clickPoint.x <= cells.width)
        	cells.thisframe[clickPoint.x][clickPoint.y] = 1;
        else
        {
        	if(clickPoint.y > 115 && clickPoint.y < 132)
        	{
        		if(cells.type == 1)
	        		cells.type = 2;
        		else
        			cells.type = 1;
        	}
        	if(clickPoint.y > 135 && clickPoint.y < 152)
        	{
        		if(paused == 1)
	        	{
	        		paused = 0;
	        		lifethread.notify();
	        	}
        		else
        			paused = 1;
        	}
        		
        	if(clickPoint.x > (cells.width + 80))
        	{
        		ruleno = (clickPoint.y - 32)/15;
        		if((ruleno >= 0) && (ruleno <= 4))
        		{
        			cells.rule[ruleno]++;
        			if(cells.rule[ruleno] > 2)
        				cells.rule[ruleno] = 0;
        		}
        	}
        }
        repaint();
    }
    public void mouseDragged(MouseEvent event) 
    {
    	clickPoint = event.getPoint();
    	if(clickPoint.x <= cells.width && clickPoint.x >= 0 && clickPoint.y <= cells.height && clickPoint.y >= 0)
        	cells.thisframe[clickPoint.x][clickPoint.y] = 1;
        repaint();
    } 
    public void mouseReleased(MouseEvent event) {}
    public void mouseExited(MouseEvent event) {}
    public void mouseClicked(MouseEvent event) {}
    public void mouseEntered(MouseEvent event) {}
    public void mouseMoved(MouseEvent event) {}
    public boolean imageUpdate( Image img, int infoflags, int x, int y, int width, int height ) 
    {
    	return false;
    }

    
    class cellsclass
    {
    	public byte[][] thisframe;
    	public byte[][] nextframe;
    	public byte[] rule = new byte[5];
    	public int width, height, type;
    	public cellsclass(int width, int height)
    	{
    		int x, y;
    		this.width = width;
    		this.height = height;
    		this.type = 1;
    		thisframe = new byte[width][height];
    		nextframe = new byte[width][height];
    		rule[0] = 2;
    		rule[1] = 0;
    		rule[2] = 1;
    		rule[3] = 0;
    		rule[4] = 2;
    		for(x = 0; x< width; x++)
    			for(y=0; y< height; y++)
    			{
    				thisframe[x][y] = 0;
    				nextframe[x][y] = 0;
    			}
    	}
    	public void doframe()
    	{
    		int adj, x, y;
    		for(x = 0; x< width; x++)
    			for(y=0; y< height; y++)
    			{
    				nextframe[x][y] = 0;
    			}
    		for(x = 0; x< width; x++)
    			for(y=0; y< height; y++)
    			{
    				if(thisframe[x][y] == 1)
    				{
    					adj = 0;
	    				if(x > 0)
	    					if(thisframe[x-1][y] == 1)
    							adj++;
    					if(y > 0)
    						if(thisframe[x][y-1] == 1)
    							adj++;
    					if(x < (width - 1))
    						if(thisframe[x+1][y] == 1)	
    							adj++;
    					if(y < (height - 1))
    						if(thisframe[x][y+1] == 1)
    							adj++;
    					if(rule[adj] == 0)
	    					nextframe[x][y] = 1;
	    				if(rule[adj] == 1)
	    				{
	    					if(type == 1)
	    						nextframe[x][y] = 1;
	    					if(x > 0)
	    						nextframe[x-1][y] = 1;
	    					if(x < (width - 1))
	    						nextframe[x+1][y] = 1;
	    					if(y > 0)
	    						nextframe[x][y-1] = 1;
	    					if(y < (height - 1))
	    						nextframe[x][y+1] = 1;
	    				}
	    			}
    			}
    		for(x = 0; x< width; x++)
    			for(y=0; y< height; y++)
    			{
    				thisframe[x][y] = nextframe[x][y];
    			}
    	}
    }
}