Circle

i=1
turtle.select(1)
function place()
    if turtle.getItemCount(i)>0 then
        turtle.placeDown()
    else
        i=i+1
        turtle.select(i)
        turtle.placeDown()
    end
end
function forward()
        while turtle.forward()==false do
                sleep(0.5)
        end
end
function up()
        while turtle.up()==false do
                sleep(0.5)
        end
end
function circle()
    turtle.turnLeft()
    for t=1,4,1 do
        for k=1,5,1 do
            place()
            forward()
        end
        turtle.turnRight()
        forward()
        turtle.turnLeft()
        place()
        forward()
        place()
        forward()
        turtle.turnRight()
        forward()
        place()
        forward()
        turtle.turnLeft()
        forward()
        place()
        forward()
        turtle.turnRight()
        forward()
        place()
        forward()
        place()
        turtle.turnLeft()
        forward()
        turtle.turnRight()
        forward()
    end
    turtle.turnRight()
end
function Cforward()
    up()
    circle()
    forward()
end
function CLeft()
    up()
    circle()
    turtle.turnLeft()
    forward()
    turtle.turnRight()
    forward()
end
function CRight()
    up()
    circle()
    turtle.turnRight()
    forward()
    turtle.turnLeft()
    forward()
end
function POS()
    for f=1,10,1 do
        forward()
    end
    turtle.turnRight()
    for f=1,6,1 do
        forward()
    end
    turtle.turnRight()
    turtle.turnRight()
end

-------------------------------------------------------------------------------
function Halfcircle()
    P()
    Cforward()
    Cforward()
    Cforward()
    Cforward()
    CLeft()
    Cforward()
    Cforward()
    CLeft()
    CLeft()
    Cforward()
    POS()
    CRight()
    CRight()
    CRight()
    Cforward()
    CRight()
    CRight()
    Cforward()
    Cforward()
    CRight()
    Cforward()
    Cforward()
    Cforward()
    O()
end
function P()
    turtle.turnLeft()
    turtle.turnLeft()
    for h=1,9,1 do
        forward()
    end
    turtle.turnLeft()
    forward()
    forward()
    turtle.turnLeft()
end
function O()
    for h=1,9,1 do
        forward()
    end
    turtle.turnLeft()
    forward()
    forward()
    turtle.turnRight()
end
Halfcircle()