Pixel Circle

--Building Materials Check
if turtle.getItemCount(16)<1 then
 print "Out of Building Materials."
 turtle.reboot()
end

--Set r
r=1
turtle.select(r)

--Height
for h=1,5 do

--4 part circle
for c=1,4 do
 turtle.digUp()
 turtle.up()
 turtle.placeDown()

--Item Check/Switch
 if r<16 and turtle.getItemCount(r)<1 then
  r=r+1
  turtle.select(r)
 end
 if turtle.getItemCount(16)<1 then
 print "Out of Building Materials."
 turtle.reboot()
end

for t=1,8 do
 turtle.turnRight()
 turtle.dig()
 turtle.forward()
 turtle.turnLeft()
 turtle.dig()
 turtle.forward()
 turtle.digDown()
 turtle.placeDown()
 if r<16 and turtle.getItemCount(r)<1 then
    r=r+1
    turtle.select(r)
   end
  if turtle.getItemCount(16)<1 then
    print "Out of Building Materials."
    turtle.reboot()
   end
 turtle.dig()
 turtle.forward()
 turtle.digDown()
 turtle.placeDown()
 if r<16 and turtle.getItemCount(r)<1 then
    r=r+1
    turtle.select(r)
   end
  if turtle.getItemCount(16)<1 then
    print "Out of Building Materials."
    turtle.reboot()
   end
end

for f=1,7 do
 turtle.dig()
 turtle.forward()
 turtle.digDown()
 turtle.placeDown()
 if r<16 and turtle.getItemCount(r)<1 then
    r=r+1
    turtle.select(r)
   end
  if turtle.getItemCount(16)<1 then
    print "Out of Building Materials."
    turtle.reboot()
   end
end

for b=1,7 do
 turtle.dig()
 turtle.forward()
 turtle.turnLeft()
 turtle.dig()
 turtle.forward()
 turtle.turnRight()
 turtle.digDown()
 turtle.placeDown()
 if r<16 and turtle.getItemCount(r)<1 then
    r=r+1
    turtle.select(r)
   end
  if turtle.getItemCount(16)<1 then
    print "Out of Building Materials."
    turtle.reboot()
   end
 turtle.dig()
 turtle.forward()
 turtle.digDown()
 turtle.placeDown()
 if r<16 and turtle.getItemCount(r)<1 then
    r=r+1
    turtle.select(r)
   end
  if turtle.getItemCount(16)<1 then
    print "Out of Building Materials."
    turtle.reboot()
   end
end

turtle.dig()
turtle.forward()
turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.digDown()
turtle.placeDown()
 if r<16 and turtle.getItemCount(r)<1 then
    r=r+1
    turtle.select(r)
   end
  if turtle.getItemCount(16)<1 then
    print "Out of Building Materials."
    turtle.reboot()
   end

turtle.turnRight()
turtle.dig()
turtle.forward()
turtle.turnLeft()
turtle.dig()
turtle.forward()
turtle.down()

end
end