circle

local tArgs = { ... }

local radius = { tonumber( tArgs[1] ), tonumber(tArgs[1])^2 }
local radians = tonumber( tArgs[2] )
local fill = tArgs[3]

local xPos, zPos = radius[1],0
local xDir, zDir = -1,0

if radians == 2 then
	xPos, zPos = radius[1], radius[1]
	xDir, zDir = -1,0
elseif radians == 1 then
	xPos, zPos = radius[1], 0
	xDir, zDir = -1,0
end

local circle = {}
for i = -radius[1], radius[1], 1 do
	circle[i] = {}
	for j = -radius[1], radius[1], 1 do
		circle[i][j] = 0
	end
end

local z = radius[1]

for x = 0, radius[1], 1 do
	if math.abs((z^2 + x^2)^0.5 - radius[1]) > math.abs(((z-1)^2 + x^2)^0.5 - radius[1]) then
		z = z-1
	end
	if z < x then
		break
	end
	circle[x][z] = 1
	circle[z][x] = 1
	circle[x][-z] = 1
	circle[z][-x] = 1
	circle[-x][z] = 1
	circle[-z][x] = 1
	circle[-x][-z] = 1
	circle[-z][-x] = 1
end

for x = 0, radius[1] - 1, 1 do
	for z = 0, radius[1] - 1, 1 do
		if circle[x][z] == 1 then
			break
		end
		circle[x][z] = 2
		circle[x][-z] = 2
		circle[-x][z] = 2
		circle[-x][-z] = 2
	end
end

local done = false
local curSlot = 1

local function selectResource()
	while turtle.getItemCount(curSlot) == 0 do
		curSlot = curSlot + 1
		if curSlot > 16 then
			return false
		end
	end
	turtle.select(curSlot)
end

local function place()
	selectResource()
	turtle.place()
end

local function placeUp()
	selectResource()
	turtle.placeUp()
end

local function placeDown()
	selectResource()
	turtle.placeDown()
end

local function move()
	if xPos == -radius[1] and math.abs(xDir+xPos) > radius[1] then
		if zPos == radius[1] then
			done = true
		else
			turtle.turnRight()
			if turtle.forward() then
				zPos = zPos + 1
			end
			turtle.turnRight()
			xDir = 1
		end
	elseif xPos == radius[1] and math.abs(xDir+xPos) > radius[1] then
		if zPos == radius[1] then
			done = true
		else
			turtle.turnLeft()
			if turtle.forward() then
				zPos = zPos + 1
			end
			turtle.turnLeft()
			xDir = -1
		end
	else
		if turtle.forward() then
			xPos = xDir + xPos
		end
	end
end

while not done do
	if circle[xPos][zPos] == 1 or (circle[xPos][zPos] == 2 and fill) then
		placeDown()
		print("(" .. xPos .. ", " .. zPos .. ") -> " .. circle[xPos][zPos])
	end

	move()
end