private static double MARGIN_OF_ERROR = 10.0; // in m
public MapPage()
{
// map with default centre at NUS
var NUSCentre = new Xamarin.Forms.Maps.Position(1.2966, 103.7764);
map = new BusMap(MapSpan.FromCenterAndRadius(NUSCentre, Distance.FromKilometers(MEAN_MAP_RADIUS)))
{
IsShowingUser = true,
HeightRequest = 100,
WidthRequest = 960,
VerticalOptions = LayoutOptions.FillAndExpand
};
// add map and slider to stack layout
var stack = new StackLayout {
Spacing = 0
};
stack.Children.Add(map);
Icon = "MapTabIcon.png";
Title = "Map";
Content = stack;
// add random buses for testing
BusSimulator.DispatchBuses();
// init bus and stop pins
UpdatePublicBusPins();
UpdateBusPins();
UpdateStopPins();
}
private async void UpdateBusPins()
{
while (true)
{
// skip update pins if map is freezed (user clicks on pin)
if (!FreezeMap)
{
// remove all bus pins
foreach (CustomPin p in map.BusPins)
{
map.Pins.Remove(p.Pin);
}
map.BusPins.Clear();
foreach (BusOnRoad bor in BusHelper.ActiveBuses.Values)
{
// move bus to next checkpoint on the route for simulation
// actual deployment: get real-time position of bus
BusSimulator.GoToNextCheckpoint(bor);
// add pin to map if service is to be shown on map
if (BusHelper.BusSvcs [bor.routeName].showOnMap)
{
var description = "Start: " + BusHelper.BusStops [bor.firstStop].name + "\n" +
"End: " + BusHelper.BusStops [bor.lastStop].name + "\n" +
"Approaching: " + BusHelper.BusStops [(string)bor.nextStopEnumerator.Current].name + "\n" +
"In: " + BusHelper.GetArrivalTiming(bor.vehiclePlate) + "\n";
var pin = new Pin {
Type = PinType.Place,
Position = new Xamarin.Forms.Maps.Position(bor.latitude, bor.longitude),
Label = bor.routeName,
Address = description
};
var bus = new CustomPin {
Pin = pin,
Id = bor.routeName,
Url = bor.routeName + ".png"
};
map.Pins.Add(pin);
map.BusPins.Add(bus);
}
}
// remove buses which has finished plying
List <BusOnRoad> finishedBuses = BusHelper.ActiveBuses.Values.Where(bor => bor.finished).ToList();
foreach (BusOnRoad bor in finishedBuses)
{
BusHelper.RemoveBusOnRoad(bor.vehiclePlate);
}
}
// continue after interval
await Task.Delay(TimeSpan.FromSeconds(SettingsVars.Variables ["REFRESH_BUS_INTERVAL"].value));
}
}
private bool UpdatePositions()
{
// skip update pins if map is freezed
if (FreezeMap)
{
return(true);
}
// remove all bus pins
foreach (CustomPin p in map.BusPins)
{
map.Pins.Remove(p.Pin);
}
map.BusPins.Clear();
foreach (BusOnRoad bor in BusHelper.ActiveBuses.Values)
{
// temp change position randomly for test
// bor.latitude += rand.NextDouble () * 0.0001 - 0.00005;
// bor.longitude += rand.NextDouble () * 0.0001 - 0.00005;
// move bus to next checkpoint on the route for simulation
BusSimulator.GoToNextCheckpoint(bor);
// add pin to map if svc show on map
if (BusHelper.BusSvcs [bor.routeName].showOnMap)
{
var description = "Start: " + BusHelper.BusStops [bor.firstStop].name + "\n" +
"End: " + BusHelper.BusStops [bor.lastStop].name + "\n" +
"Approaching: " + BusHelper.BusStops [(string)bor.nextStopEnumerator.Current].name + "\n" +
"In: " + BusHelper.GetArrivalTiming((string)bor.nextStopEnumerator.Current, bor.routeName);
var pin = new Pin {
Type = PinType.Place,
Position = new Xamarin.Forms.Maps.Position(bor.latitude, bor.longitude),
Label = bor.routeName,
Address = description
};
var bus = new CustomPin {
Pin = pin,
Id = bor.routeName,
Url = bor.routeName + ".png"
};
map.Pins.Add(pin);
map.BusPins.Add(bus);
}
}
return(true);
}
public MapPage()
{
// map with default centre at NUS
var NUSCenter = new Xamarin.Forms.Maps.Position(1.2966, 103.7764);
map = new BusMap(
MapSpan.FromCenterAndRadius(NUSCenter, Distance.FromKilometers(DEFAULT_RADIUS)))
{
IsShowingUser = true,
HeightRequest = 100,
WidthRequest = 960,
VerticalOptions = LayoutOptions.FillAndExpand
};
// shift to current location if possible (activate only for device testing)
// ShiftToCurrentLocation ();
// add pins for each bus stops
foreach (BusStop busStop in BusHelper.BusStops.Values)
{
var description = "";
foreach (string svc in busStop.services)
{
description += svc + ": " + BusHelper.GetArrivalTiming(busStop.busStopCode, svc) + "\n";
}
var pin = new Pin {
Type = PinType.Place,
Position = new Xamarin.Forms.Maps.Position(busStop.latitude, busStop.longitude),
Label = busStop.name + " - " + busStop.busStopCode,
Address = description
};
var stop = new CustomPin {
Pin = pin,
Id = "stop",
Url = "stop.png"
};
map.Pins.Add(pin);
map.StopPins.Add(stop);
}
// slider to change radius from 0.1 - 0.9 km
var slider = new Slider(1, 9, 5);
slider.ValueChanged += (sender, e) => {
var zoomLevel = e.NewValue; // between 1 and 9
currRadius = 1.0 - (zoomLevel / 10.0);
map.MoveToRegion(MapSpan.FromCenterAndRadius(
map.VisibleRegion.Center, Distance.FromKilometers(currRadius)));
};
// add map and slider to stack layout
var stack = new StackLayout {
Spacing = 0
};
stack.Children.Add(map);
stack.Children.Add(slider);
Icon = "MapTabIcon.png";
Title = "Map";
Content = stack;
// add random buses for testing
BusSimulator.DispatchBuses();
// set timer to update bus and current location
Device.StartTimer(TimeSpan.FromSeconds(REFRESH_INTERVAL), UpdatePositions);
}
