import java.awt.*;       // Import Abstract Window Toolkit
import java.applet.*;    // Import Applet stuff

public class SimpleTreeWorld extends TurtleWorld 
{
     public void setup() 
     {
          
     }
     public void run() 
     {
          System.out.println("SimpleTreeWorld run() action.");
          TreeMaker trina = new TreeMaker();
          // move to position in bottom center, facing up
          trina.pu();
          trina.lt(90);
          trina.bd((this.size().height)/2);
          trina.pd();
          
          // draw tree
          trina.tree(7, 100, 32, 0.8);    
          
     }   
}
class TreeMaker extends Turtle 
{
     public void tree (int levels, double length, double angle, double shrink) 
     {
          if (levels <= 0) {
               // do nothing
          } else {
               fd(length);
               rt(angle);
               tree(levels-1, length*shrink, angle, shrink);
               lt(2*angle);
               tree(levels-1, length*shrink, angle, shrink);
               rt(angle);
               bd(length);      
          }
     }  
}