// return "arr" or "x min" of bus reaching next stop
// to show on bus on road
public static string GetArrivalTiming(string vehiclePlate)
{
BusOnRoad bor = ActiveBuses [vehiclePlate];
BusSvc svc = BusSvcs [bor.routeName];
string busStopCode = (string)bor.nextStopEnumerator.Current;
// get diff of distance travelled by bus and distance between stops for the service
var diffDist = svc.distanceBetweenStops [bor.stopCounter] - bor.distanceTravelled;
var time = (int)((diffDist / bor.avgSpeed) / 60); // in min
// if arrived bus stop
if (diffDist < MARGIN_OF_ERROR &&
((string)bor.nextStopEnumerator.Current).Equals(busStopCode))
{
// shift next stop indicator
// if no more stop, finish service
// else, keep counting
if (!bor.nextStopEnumerator.MoveNext())
{
bor.finished = true;
}
else
{
bor.stopCounter++;
}
}
// generate display string (give +- 1 allowance)
return((time == 0 || time == -1) ? "Arr" : ((time > 60 || time < -1) ? "--" : time + " min"));
}
private static async void DispatchBasedOnTime(BusSvc bs)
{
while (BusHelper.IsWithinServiceTiming(bs.routeName))
{
BusHelper.AddBusOnRoad(bs.routeName + "-" + BusHelper.ActiveBuses.Count, bs.routeName);
// dispatch again after freq
await Task.Delay(TimeSpan.FromMinutes(bs.freq [BusHelper.GetTimeOfDay(bs.routeName)]));
}
}
// have a stopwatch to keep track of time since bus service last dispatched
// in order to estimate bus arrival timing for first stop
private static void StartTimerDispatch(BusSvc bs)
{
// init/reset stopwatch
if (bs.timerSinceLastDispatch == null)
{
bs.timerSinceLastDispatch = new Stopwatch();
bs.timerSinceLastDispatch.Start();
}
else
{
bs.timerSinceLastDispatch.Restart();
}
}
// return true if current time between first bus and last bus timing
public static bool IsWithinServiceTiming(string routeName)
{
TimeSpan currTimeSpan = DateTime.Now.TimeOfDay;
BusSvc svc = BusSvcs [routeName];
int day = GetDayOfWeek();
// case not operating throughout the day
if (svc.firstBusTime.Count <= day)
{
return(false);
}
return(currTimeSpan.CompareTo(TimeSpan.Parse(svc.firstBusTime[day])) > 0 &&
currTimeSpan.CompareTo(TimeSpan.Parse(svc.lastBusTime[day])) < 0);
}
// simulate bus moving along the route (via checkpoints on route)
public static void GoToNextCheckpoint(BusOnRoad bor)
{
// init if needed
BusSvc svc = BusHelper.BusSvcs [bor.routeName];
if (bor.nextCheckpointEnumerator == null)
{
bor.nextCheckpointEnumerator = svc.checkpoints.GetEnumerator();
}
else if (bor.nextDistanceEnumerator == null)
{
bor.nextDistanceEnumerator = svc.distanceBetweenCheckpoints.GetEnumerator();
}
// default position at first stop
double longitude = BusHelper.BusStops [svc.firstStop].longitude;
double latitude = BusHelper.BusStops [svc.firstStop].latitude;
// update position and distance based on checkpoint
if (bor.nextCheckpointEnumerator.MoveNext())
{
longitude = (double)bor.nextCheckpointEnumerator.Current;
}
if (bor.nextCheckpointEnumerator.MoveNext())
{
latitude = (double)bor.nextCheckpointEnumerator.Current;
}
if (bor.nextDistanceEnumerator != null && bor.nextDistanceEnumerator.MoveNext())
{
bor.distanceTravelled += (double)bor.nextDistanceEnumerator.Current;
}
// update bus position
bor.longitude = longitude;
bor.latitude = latitude;
}
// return "arr" or "x min" or "not operating" of next and subsequent bus timing
// of each bus service serving the bus stop
// to show on bus stop
// for NUS buses
public static string GetArrivalTiming(string busStopCode, string routeName, string loop = "" /* optional, "BEFORE" or "AFTER" if repeatedService*/)
{
BusSvc svc = BusSvcs [routeName];
// case not operating
if (!IsWithinServiceTiming(routeName))
{
return("not operating");
}
// calculate arrival timing (next and subsequent) based on bus stop and route
int nextTiming = Int16.MaxValue;
int subsequentTiming = Int16.MaxValue;
foreach (BusOnRoad bor in ActiveBuses.Values.Where(b => b.routeName.Equals(routeName)))
{
// ignore buses of wrong direction for repeated services case
if ((loop.Equals("BEFORE") && bor.stopCounter > svc.stops.IndexOf(svc.loopStop)) ||
(loop.Equals("AFTER") && bor.stopCounter < svc.stops.IndexOf(svc.loopStop)))
{
continue;
}
// first bus stop case
if (busStopCode.Equals(bor.firstStop))
{
if (bor.stopCounter == 0 && svc.timerSinceLastDispatch != null)
{
// get time by freq for the first stop (ignore negative)
var timeOfDay = GetTimeOfDay(routeName);
var timeDiff = svc.freq [timeOfDay] - (int)(svc.timerSinceLastDispatch.ElapsedMilliseconds / (1000 * 60));
if (timeDiff >= 0)
{
nextTiming = timeDiff;
}
if (timeDiff + svc.freq [timeOfDay] >= 0)
{
subsequentTiming = timeDiff + svc.freq [timeOfDay];
}
}
}
else
{
// get diff of distance travelled by bus and distance between stops for the service
// count from back for case after loop (repeated service) or last stop
var index = (loop.Equals("AFTER") || bor.stopCounter >= svc.stops.Count - 2) ? svc.stops.LastIndexOf(busStopCode) - 1 : svc.stops.IndexOf(busStopCode) - 1;
// bounds check
if (index < 0 || index >= svc.distanceBetweenStops.Count)
{
continue;
}
var diffDist = svc.distanceBetweenStops [index] - bor.distanceTravelled;
// ignore getting time if bus passed stop
if (diffDist < 0)
{
continue;
}
var time = (int)((diffDist / bor.avgSpeed) / 60); // in min
// store the next and subsequent time if lesser
if (nextTiming > time)
{
subsequentTiming = nextTiming;
nextTiming = time;
}
else if (subsequentTiming > time)
{
subsequentTiming = time;
}
}
}
// generate display string of next and subsequent timings (ignore if more than 30 min)
string display = "";
display += (nextTiming == 0) ? "Arr" : ((nextTiming > 60) ? "--" : nextTiming + " min");
display += " / ";
display += (subsequentTiming == 0) ? "Arr" : (subsequentTiming > 60) ? "--" : subsequentTiming + " min";
return(display);
}
