Animated Htree java in a pgm

AnimatedHtree.java

public class AnimatedHtree

{

 public static void draw(int n, double x, double y, double size)

{

        if (n == 0) return;

                    double x0 = x - size/2, x1 = x + size/2;

        double y0 = y - size/2, y1 = y + size/2;

        StdDraw.line(x0,  y, x1,  y);

        StdDraw.line(x0, y0, x0, y1);

        StdDraw.line(x1, y0, x1, y1);

        StdDraw.show(1000);

                    draw(n-1, x0, y0, size/2);  

        draw(n-1, x0, y1, size/2);  

        draw(n-1, x1, y0, size/2);  

        draw(n-1, x1, y1, size/2);  

    }

               

                public static void main(String[] args)

    {

        int N = Integer.parseInt(args[0]);

        StdDraw.setPenRadius(0.005);

        draw(N, .5, .5, .5);

    }

}