circle build

local nx = 0
local ny = 0
local a = 0
local cx = 0
local cy = 0
local dNeed = 0

function checkFuel()
    turtle.select(1)
    while turtle.getFuelLevel() < 100 do
        turtle.refuel(1)
    end
    turtle.select(slotNum)
end

local function newPlot()
    nx = math.cos((a*(3.14/180))*r)
    if nx >= 0 then
        nx = math.floor(nx+0.5)
    else
        nx=math.ceil(nx-0.5)
    end
    ny = math.sin((a*(3.14/180))*r)
    if ny >= 0 then
        ny=math.floor(ny + 0.5)
    else
            ny=math.ceil(ny - 0.5)
    end
end

local function dRection()
    while dNeed ~= dIs do
        turtle.turnLeft()
        dIs = dIs + 1
        if dIs > 4 then
            dIs = 1
        end
        print("dIs = "..dIs)
        print("dNeed = "..dNeed)
        print("tempX = "..tempX)
        print("tempY = "..tempY)
        print("cx,cy = "..cx..","..cy)
        print("\n")
    end
end

local function xMovement()
    tempX = nx-cx
    if tempX == 1 then
        dNeed = 4
    elseif tempX == -1 then
        dNeed = 2
    end
end

local function yMovement()
    tempY = ny-cy
    if tempY == 1 then
        dNeed = 1
    elseif tempY == -1 then
        dNeed = 3
    end
end

local function forwardCheck()
    while not turtle.forward() do
        os.sleep(1)
    end
end

local function placeBlock()
    if turtle.getItemCount(slotNum) > 0 then
        turtle.placeDown()
    else
        if slotNum <= 15 then
            slotNum = slotNum + 1
        else
            term.clear()
            term.setCursorPos(1,1)
            print ("Out of blocks please reload then press any key to continue.")
            os.pullEvent()
            slotNum = 2
        end
        turtle.select(slotNum)
        turtle.placeDown()
    end
end

local function startUp()
    term.clear()
    term.setCursorPos(1,1)
    print("Place fuel in slot 1 and fill the rest of the slots with your blocks.")
    print("Make sure the area is clear of obsticals cause they will screw me up.")
    print ("What is the diameter of your circle?")
    d = tonumber(read())
    print("Hi-Ho Hi-Ho its off to work I go.")
    r = d/2
    slotNum = 2
end

startUp()
checkFuel()
turtle.up()
for t=1,r do
    turtle.forward()
end
placeBlock()
dIs = 4
cx = r
cy = 0
for a = 1,360 do
    newPlot()
    xMovement()
    if tempX ~= 0 then
        dRection()
        forwardCheck()
        placeBlock()
    end
    yMovement()
    if tempY ~= 0 then
        dRection()
        forwardCheck()
        placeBlock()
    end
    checkFuel()
end