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

// Global code will be evaluated once.
const t = new Turtle();
t.penup();
t.goto(0,0);
t.pendown();

const fib = [1, 1];

function walk(i) {
    const l = fib.length;
    const lf = fib[l - 1];
    const nf = fib[l] = lf + fib[l - 2];
    t.forward(i*2);
    t.right((nf / lf) * 89);
    return i < 400;
}