// Ž÷–Ø‹È�ü(Ž}‚ÌŠp“x‚ð—��”) [Treer.java] 
 import java.awt.*; 
 public class Treer extends Tree {    // Tree.java‚ðŒp�³ 
    //============== Ž÷–Ø‹È�ü(Ž}‚ÌŠp“x‚ð—��”) ============== 
    public void rtree(Graphics g,int nn,double x0,double y0, 
                      double len,double ang) { 
       if (nn <= 0) { return; } 
       double x,y; 
       final double RAD=Math.PI/180.0;  // ƒ‰ƒWƒAƒ“‚É•ÏŠ· 
       x=len*Math.cos(RAD*ang)+x0;             //(f) x‚ÌŒvŽZ 
       y=len*Math.sin(RAD*ang)+y0;             //(f) y‚ÌŒvŽZ 
       g.drawLine((int)x0,(int)(h-y0),(int)x,(int)(h-y)); 
       int ang_r1=(int)(Math.random()*50);     // <-- Šp“x 
       int ang_r2=(int)(Math.random()*50);     // <-- Šp“x 
       rtree(g,nn-1,x,y,len*scale,ang-ang_r1); //(g) ‰E‚ÌŽ} 
       rtree(g,nn-1,x,y,len*scale,ang+ang_r2); //(g) �¶‚ÌŽ} 
    } //end rtree 
 } //end Treer