//CA1D.java
//with one of the interesting rules

import javax.swing.*;
import java.awt.*;

public class CA1D extends JApplet {

    int cellsize;

    public  void init () {

	String input;
	input = JOptionPane.showInputDialog("Cell size");
	cellsize = Integer.parseInt(input);

/*
	input = JOptionPane.showInputDialog("How many 'cells' (try 40)?");
	int size = Integer.parseInt(input);
	int[] A = new int[size]; 

	input = JOptionPane.showInputDialog("How many 'generations' (try 20)?");
	int gens = Integer.parseInt(input);

	JTextArea textarea = new JTextArea(gens,size+1);
	textarea.setLineWrap( true );
	textarea.setFont( new Font("Courier",Font.BOLD,18) );
	JScrollPane scrollpane = new JScrollPane(textarea);

	for (int i=0; i<A.length; i++) {
	    A[i] = (int)(Math.random() * 2);
	}
        displayGeneration(A,textarea);

	for (int g=1; g<=gens; g++) {
	    newGen(A);
	    displayGeneration(A,textarea);
	}

	JOptionPane.showMessageDialog(null, 
				      scrollpane,
				      "1 D Cellular automata",
				      JOptionPane.PLAIN_MESSAGE);
*/
    }

/*
    public void displayGeneration(int[] A, JTextArea textarea) {
	for (int i=0; i<A.length; i++) {
	    if (A[i] == 1)
                textarea.append("*"); 
	    else
	        textarea.append(" "); 
	}
        textarea.append("\n"); 
    }
*/
    
    public void newGen (int[] A) {
    	int [] B = new int[A.length];
    	
    	//build up next generation in other array
	for (int i=1; i<A.length-1; i++)
    	    if (A[i] >= 2)  //living
    	        //both nbors living or both dead
    	        if (A[i-1]>=2 && A[i+1]>=2 || A[i-1]<2 && A[i+1]<2)  
    	            B[i] = 3;  //stays alive
    	        else
    	            B[i] = 0;  //dies
    	    else            //dead
    	        //both nbors living or both dead
    	        if (A[i-1]>=2 && A[i+1]>=2 || A[i-1]<2 && A[i+1]<2)  
    	            B[i] = 2;    //birth
    	        else
    	            B[i] = 1;    //stays dead
    	            
    	//copy back to original array
	for (int i=1; i<A.length-1; i++)
	    A[i] = B[i];    	
    }


    public void paint (Graphics g) {
	int[] A = new int[getWidth()/cellsize]; 
    	
	for (int i=0; i<A.length; i++) {
	    A[i] = (int)(Math.random() * 2) + 1; //1 is dead, 2 is birth
	}

	for (int gen=0; gen<getHeight()/cellsize; gen++) {
            for (int i=0; i<A.length; i++) {
                if (A[i] == 0)        //death
		    g.setColor(Color.RED);
                else if (A[i] == 1)   //staying dead
		    g.setColor(Color.PINK);
                else if (A[i] == 2)   //birth
		    g.setColor(Color.GREEN);
                else if (A[i] == 3)   //staying alive
		    g.setColor(Color.CYAN);
                if (cellsize == 1)
                    g.drawLine(i,gen,i,gen);
                else
                    g.fillRect(i*cellsize,gen*cellsize,cellsize,cellsize);
            }
	    newGen(A);
	}
    }
}