navi

function goto(xx,zz)
  x = tonumber(xx)
  z = tonumber(zz)
 rednet.open("left")
   cx, cy, cz = gps.locate()
  function getDirec()
    if z == cz then
      if x > cx then
        dir = 1
      else
        dir = 3
      end
    elseif cz > z then
      dir = 0
    else
      dir = 2
    end
  end
  function cal()
    for i = 1, dir do
      turtle.turnRight()
    end
  end
  function uncal()
    for o = 1, dir do
      turtle.turnLeft()
    end
  end
  function goZ()
    getDirec()
    cal()
    distzz = cz - z
    distz = math.abs(distzz)
    for p = 1, distz do
      turtle.forward()

    end
    uncal()
  end
  function goX()
    getDirec()
    cal()
    distxx = cx - x
    distx = math.abs(distxx)
    for q = 1, distx do
     turtle.dig()
     turtle.forward()
    end
    uncal()
  end
  goZ()
  goX()
end