test2

cy = 0
ax = 2
az = 2
ymax = 40

ylocs = {}
----- functions
function getColour(int)
  if int <= -10 then return colors.blue end
  if int == -9 then return colors.purple end
  if int == -8 then return colors.magenta end
  if int == -7 then return colors.cyan end
  if int == -6 then return colors.lightBlue end
  if int == -5  then return colors.pink end
  if int == -4  then return colors.yellow end
  if int == -3  then return colors.lime end
  if int == -2  then return colors.green end
  if int == -1  then return colors.brown end
  if int == 0  then return colors.red end
  return colors.green
end

function moveUp()
  if cy ~= 0 then
    turtle.up()
    cy = cy + 1
  end
end

function moveDown()
  if not turtle.detectDown() then
    turtle.down()
    cy = cy - 1
  end
end

function doStuff(xx, zz)
  for yd = 1, ymax do
    if turtle.detectDown() then
      if ylocs[xx] == nil then
        ylocs [xx] = {}
      end
      table.insert(ylocs[xx],xx,zz)
     -- ylocs[xx] = {[zz] = cy}
    else
      moveDown()
    end
  end
  for yu = cy, 0 do
    moveUp()
  end
end
----- code
term.clear()
term.setCursorPos(1,1)
for zz = 1, az do
  for xx = 1, ax do
    turtle.forward()
    doStuff(xx,zz)
   -- turtle.forward()
  end
  turtle.turnRight()
  turtle.turnRight()
  for xx = 1, ax do
    turtle.forward()
  end
  turtle.turnLeft()
  turtle.forward()
  turtle.turnLeft()
end

print(ylocs)
for x2 = 1, ax do
  for z2 = 1, az do
    --print("works")
    --print(x2)
    --print("-")
    --print(z2)
    --print("---")
    --print(ylocs[1][1])
    --print(ylocs[1][2])
    term.setBackgroundColor(getColour(ylocs[x2][z2]))
    term.setCursorPos(z2, x2)
    term.print(" ")
  end
end