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

// Global code will be evaluated once.
const turtle = new Turtle();
const radius= 80; // min=1, max=100, step=1
const nLines = 40; // min=1, max=100, step=1

// The walk function will be called until it returns false.
function walk(i) {
    const {x,y} = getRandomPointOnCircle(radius)
    turtle.goto(x,y);
    return i < nLines;
}

const getRandomPointOnCircle = radius => {
    const angle = Math.PI*2 * Math.random();
    const x = Math.sin(angle) * radius;
    const y = Math.cos(angle) * radius;
    return {x,y}
}

turtle.penup();
const {x,y} = getRandomPointOnCircle(radius)
turtle.goto(x,y);
turtle.pendown();