import java.awt.Color;

public class Tree $\{$

public static void tree$($int n$,$ double x$,$ double y$,$ double a$,$ double branchRadius$)\{$

double bendAngle $=$ Math.toRadians$(15)$;

double branchAngle $=$ Math.toRadians$(37)$;

double branchRatio $=0\mathrm{.}65$;

double cx $=$ x $+$ Math.cos$($a$)*$ branchRadius;

double cy $=$ y $+$ Math.sin$($a$)*$ branchRadius;

StdDraw.setPenRadius$(0\mathrm{.}005*$ Math.pow$(1,1\mathrm{.}2))$;

StdDraw.setPenColor$($Color$.$BLUE$)$;

StdDraw.line$($x$,$ y$,$ cx$,$ cy$)$;

if $($n $==0)$ return;

tree$($n$-1,$ cx$,$ cy$,$ a $+$ bendAngle $-$ branchAngle, branchRadius $*$ branchRatio$)$;

tree$($n$-1,$ cx$,$ cy$,$ a $+$ bendAngle $+$ branchAngle, branchRadius $*$ branchRatio$)$;

$\}$

public static void main$($String$[]$ args$)\{$

int n $=1$;

StdDraw.enableDoubleBuffering$()$;

tree$($n$,0\mathrm{.}5,0,$ Math.PI$/2,0\mathrm{.}3)$;

StdDraw.show$()$;

$\}$

$\}$