// You can find the Turtle API reference here: https://turtletoy.net/syntax
Canvas.setpenopacity(1);

const turtle = new Turtle();

const iterations = 5; // min=0 max=8 step=1 
const choice = 0; // min=0 max=1 step=1 (straight, diagonal)

function tiling(x, y, s, l, mode) {
    if ((l === 0)) {
        if ((mode === 0)) {
            if ((Math.random() < 0.5)) {
                turtle.penup();
                turtle.goto(x, (y - s));
                turtle.pendown();
                turtle.goto(x, (y + s));
            } else {
                turtle.penup();
                turtle.goto((x + s), y);
                turtle.pendown();
                turtle.goto((x - s), y);
            }
        } else {
            if ((mode === 1)) {
                if ((Math.random() < 0.5)) {
                    turtle.penup();
                    turtle.goto((x + s), (y - s));
                    turtle.pendown();
                    turtle.goto((x - s), (y + s));
                } else {
                    turtle.penup();
                    turtle.goto((x + s), (y + s));
                    turtle.pendown();
                    turtle.goto((x - s), (y - s));
                }
            }
        }
    } else {
        s /= 2;
        l -= 1;
        tiling((x - s), (y + s), s, l, mode);
        tiling((x + s), (y + s), s, l, mode);
        tiling((x - s), (y - s), s, l, mode);
        tiling((x + s), (y - s), s, l, mode);
    }
}
// set the function variables
tiling(0, 0, 88, iterations, choice);