thx bpierre

modul goto()

var activeGoto = false;
var posGoto = [0,0];
function goto() {
  var c = modul.coordinates();
  if (c[0] > posGoto[0]) {
    modul.move("left");
  } else if (c[0] < posGoto[0]) {
    modul.move("right");
  }
  if (c[1] > posGoto[1]) {
    modul.move("top");
  } else if (c[1] < posGoto[1]) {
    modul.move("bottom");
  }
  if (c[0] === posGoto[0] && c[1] === posGoto[1]) {
    ui.log("End of the trip!"); // never shown?
    activeGoto = false;
  }
}
function initGoto(x, y) {
  posGoto = [x, y];
  activeGoto = true;
}
function stopGoto() {
  ui.log("Trip stopped"); // never shown?
  activeGoto = false;
}

world.on('interval', function(){
  if (activeGoto) goto();
});