// 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();
turtle.degrees()

// The walk function will be called until it returns false.
turtle.pendown();
function walk(i) {
    if (i % 2 === 0) {
        for (var x = 0; x < 10; x++) {
            const radius = 10 * i + x;
            turtle.penup();
            turtle.goto(0, -radius * .5 - x)
            turtle.seth(i * 2)
            turtle.pendown();
            turtle.circle(radius);        
        }
    }
    
    return i < 40;
}