private MovingVehicleInfo GetLocationOnPath(
MovingVehicleInfo mvi,
List <RouteSegmentPaths> path,
double distance,
RouteSegments routeSegment
)
{
var nextDistance = distance;
for (var i = 0; i < path.Count(); i++)
{
var currentDistance = path[i].Distance;
var remainDistance = nextDistance - currentDistance;
if (remainDistance > 0)
{
nextDistance -= currentDistance;
}
else
{
var fraction = nextDistance / currentDistance;
if (fraction < 0.0 || fraction > 1.0)
{
return(IsInvalid(mvi, "fraction < 0.0 || fraction > 1.0"));
}
if (nextDistance < 0 && nextDistance > currentDistance)
{
return(IsInvalid(mvi, "nextDistance < 0 && nextDistance > currentDistance"));
}
return(CalculateLocationOnPath(mvi, path[i], nextDistance, routeSegment));
}
}
return(CalculateLocationOnPath(mvi, path[path.Count() - 1], 1.0, routeSegment));
}
private MovingVehicleInfo CalculateLocationOnPath(
MovingVehicleInfo mvi,
RouteSegmentPaths path,
double distance,
RouteSegments routeSegment
)
{
var fraction = distance / path.Distance;
var lat1 = path.StartPoint.Y / 180 * pi;
var lng1 = path.StartPoint.X / 180 * pi;
var lat2 = path.EndPoint.Y / 180 * pi;
var lng2 = path.EndPoint.X / 180 * pi;
var lng = lng1 + (lng2 - lng1) * fraction;
if (lng2 == lng1)
{
lng2 += Math.Pow(10.0, -15.0);
}
var lat = Math.Atan(
(Math.Tan(lat1) * Math.Sin(lng2 - lng) +
Math.Tan(lat2) * Math.Sin(lng - lng1)) / Math.Sin(lng2 - lng1)
);
var normalized = new Point(lng * 180 / pi, lat * 180 / pi);
mvi.MovingVehicle.Normalized = normalized;
mvi.MovingVehicle.RouteSegmentId = routeSegment.Id;
mvi.MovingVehicle.LastPathPosition = path.Position;
mvi.MovingVehicle.DistanceFromLastPath = distance;
mvi.MovingVehicle.UpdatedAt = _nextTime;
return(mvi);
}
private void RenderMapOverlay()
{
Map.Pins.Clear();
Map.MapElements.Clear();
foreach (var stop in Stops)
{
var pin = new CustomPin()
{
Position = new Position(decimal.ToDouble(stop.XCoordinate), decimal.ToDouble(stop.YCoordinate)),
Label = stop.Name,
Type = PinType.Place
};
Map.Pins.Add(pin);
}
foreach (var bus in Buses)
{
var pin = new CustomPin
{
Position = new Position(decimal.ToDouble(bus.XCoordinate), decimal.ToDouble(bus.YCoordinate)),
Label = bus.BusId.ToString(),
Type = PinType.Generic
};
Map.Pins.Add(pin);
}
foreach (var routeSegment in RouteSegments)
{
var startPosition = new Position(decimal.ToDouble(routeSegment.StartXCoordinate), decimal.ToDouble(routeSegment.StartYCoordinate));
var nextRouteSegment = RouteSegments.Where(r => r.RouteSegmentId == routeSegment.NextRouteSegmentId).First();
var endPosition = new Position(decimal.ToDouble(nextRouteSegment.StartXCoordinate), decimal.ToDouble(nextRouteSegment.StartYCoordinate));
var polyline = new Polyline
{
StrokeWidth = 12,
Geopath =
{
startPosition,
endPosition
}
};
switch (routeSegment.RouteId)
{
case 1:
polyline.StrokeColor = Color.Blue;
break;
case 2:
polyline.StrokeColor = Color.Green;
break;
case 3:
polyline.StrokeColor = Color.Red;
break;
}
Map.MapElements.Add(polyline);
}
}
