I've also added Java support to picoturtle. Here's a program to draw a rather groovy tunnel. Java code follows.
import in.abhishekmishra.picoturtle.Turtle;
import in.abhishekmishra.picoturtle.TurtleState;
public class Tunnel
{
public static void cuboid(Turtle t, double b, double w, double h) {
t.forward(b);
t.right(-45);
t.forward(h);
t.back(h);
t.left(-45);
t.left(90);
t.forward(w);
t.left(-45);
t.forward(h);
t.back(h);
t.right(-45);
t.left(90);
t.forward(b);
t.left(-135);
t.forward(h);
t.back(h);
t.right(-135);
t.left(90);
t.forward …