function checkPlayerOnScreen()
  for _, creature in ipairs(getSpectators(pos())) do
    if creature:isPlayer() and not creature:isLocalPlayer() then
      return true
    end
  end
  return false
end

 -- if checkPlayerOnScreen() then return end

function countPlayers()
  local playerCount = 0
  for _, creature in ipairs(getSpectators(pos(), false)) do
    if creature:isPlayer() and not creature:isLocalPlayer() then
      playerCount = playerCount +1
    end
  end
  return playerCount
end

macro(2000, "PlayeronScreen", function()
  say("players on screen:"..countPlayers())
end)