/* From: "COMPUTATIONAL PHYSICS, 2nd Ed" 
   by RH Landau, MJ Paez, and CC Bordeianu 
   Copyright Wiley-VCH, 2007.
   Electronic Materials copyright: R Landau, Oregon State Univ, 2007;
   MJ Paez, Univ Antioquia, 2007; and CC Bordeianu, Univ Bucharest, 2007.
   Support by National Science Foundation                              
   */

import java.io.*;                           //Location of PrintWriter
import java.util.*;                              //Location of Random
import java.lang.*;                                //Location of Math

public class TREE {
	
  public static void main(String[] argv) throws IOException, 
                                        FileNotFoundException {
		                              // Initialize file to write data to
	  PrintWriter q = new PrintWriter(
			                     new FileOutputStream("TREE.DAT"),true);
                  // Initialize 48 bit pseudo-random number generator
    long seed = 899432;       // Different seeds, different sequences
	  Random randnum = new Random(seed); 
	              // To access next random double: randnum.nextDouble()
    int imax = 9999;                     		
	  int i = 0;
	  double x = 0.0, y = 0.5, r = 0.0, xn = 0.0, yn = 0.0;
		
	  for ( i = 1; i<=imax; i++)  {
		  r = randnum.nextDouble();
      if ( r <= 0.1 )  {
			  xn = 0.05*x;
			  yn = 0.6*y;
			}
      else if ( r>0.1 && r<=0.2 ) {
			  xn = 0.05*x;
			  yn = -0.5*y+1.0;
			}
      else if ( r> 0.1 && r<= 0.2 )  {
			  xn = 0.05*x;
			  yn = -0.5*y+1.0;
			}
      else if ( r>0.2 && r<=0.4 )  {
			  xn = 0.46*x-0.32*y;
			  yn = 0.39*x+0.38*y+0.6;
			}
 		  else if ( r>0.4 && r<=0.6 )  {
			  xn = 0.47*x-0.15*y;
			  yn = 0.17*x+0.42*y+1.1;
			}

		else {
		  xn = 0.42*x+0.26*y;
			yn = -0.35*x+0.31*y+0.7;
			}
      q.println(xn+"  "+yn);
		  x = xn;
		  y = yn;
    }
    System.out.println(" ");
	  System.out.println("TREE Program Complete.");
	  System.out.println("Data stored in TREE.DAT");
	  System.out.println(" ");
	  System.out.println(" ");
	  System.out.println(" ");
	  System.out.println(" ");
  }
}                                                     // End of class