Canvas.setpenopacity(1);

const turtle = new Turtle();

let step = 2.4
const SZ = 200
let R1 = 54
let R2 = 36
let h = step * 2.5

function bump(dx) {
    turtle.left(90)
    turtle.forward(h)
    turtle.right(90)
    turtle.forward(dx)
    turtle.right(90)
    turtle.forward(h)
    turtle.left(90)
}

for (let y = -100; y <= 100; y += step) {
    turtle.penup()
    turtle.goto(-100, y)
    turtle.pendown()
    
    if ((y < -R1) || (y > R1)) {
        turtle.forward(200)
    }
    else if ((y < -R2) || (y > R2)) {
        rx = Math.sqrt(R1 * R1 - y * y)
        
        turtle.forward(SZ/2 - rx)
        bump(2 * rx)
        turtle.forward(SZ/2 - rx)
    }
    else {
        rx1 = Math.sqrt(R1 * R1 - y * y)
        rx2 = Math.sqrt(R2 * R2 - y * y)
        
        turtle.forward(SZ/2 - rx1)
        bump(rx1 - rx2)
        turtle.forward(2 * rx2)
        bump(rx1 - rx2)
        turtle.forward(SZ/2 - rx1)
    }
}

/*function walk(i) {
    turtle.forward(100);
    turtle.right(144);
    return i < 4;
}*/