+
+const std::string FGAirportDynamics::getAtisSequence()
+{
+ if (atisSequenceIndex == -1) {
+ updateAtisSequence(1, false);
+ }
+
+ return GetPhoneticLetter(atisSequenceIndex);
+}
+
+int FGAirportDynamics::updateAtisSequence(int interval, bool forceUpdate)
+{
+ double now = globals->get_sim_time_sec();
+ if (atisSequenceIndex == -1) {
+ // first computation
+ atisSequenceTimeStamp = now;
+ atisSequenceIndex = rand() % LTRS; // random initial sequence letters
+ return atisSequenceIndex;
+ }
+
+ int steps = static_cast<int>((now - atisSequenceTimeStamp) / interval);
+ atisSequenceTimeStamp += (interval * steps);
+ if (forceUpdate && (steps == 0)) {
+ ++steps; // a "special" ATIS update is required
+ }
+
+ atisSequenceIndex = (atisSequenceIndex + steps) % LTRS;
+ // return a huge value if no update occurred
+ return (atisSequenceIndex + (steps ? 0 : LTRS*1000));
+}