public async void SendPatrolCarAlerts()
{
try
{
while (true)
{
double distance = generateDistanceTravelled(this.locationReportingInterval);
GPSCoords newLocation = calculateCoords(this.carLatPosition, this.carLongPosition, distance, this.milesPerDegreeLat, this.milesPerDegreeLong);
this.carLatPosition = newLocation.Latitude;
this.carLongPosition = newLocation.Longitude;
var alert = new PatrolCarLocationAlert()
{
CarID = this.carName,
CarNum = this.carNum,
LocationLatitude = this.carLatPosition,
LocationLongitude = this.carLongPosition,
Speed = this.speed,
Time = DateTime.UtcNow
};
var serializedAlert = JsonConvert.SerializeObject(alert);
var data = new Microsoft.Azure.Devices.Client.Message(Encoding.UTF8.GetBytes(serializedAlert));
data.Properties.Add("Type", $"Telemetry_{DateTime.Now.ToLongTimeString()}");
await this.deviceClient.SendEventAsync(data);
Trace.TraceInformation($"Sending: {alert.ToString()}");
await Task.Delay(this.locationReportingInterval * 1000);
}
}
catch (Exception e)
{
Trace.TraceError($"Error sending message: {e.Message}");
}
}
private GPSCoords calculateCoords(double carLatPosition, double carLongPosition, double distance, double milesPerDegreeLat, double milesPerDegreeLong)
{
int directionFactorLat = 0;
int directionFactorLong = 0;
if (this.speed >= 60)
{
directionFactorLat = this.previousDirectionFactorLat;
directionFactorLong = this.previousDirectionFactorLong;
}
else if (this.speed > 30)
{
directionFactorLat = this.previousDirectionFactorLat;
directionFactorLong = rnd.Next(3) - 1;
this.previousDirectionFactorLong = directionFactorLong;
}
else if (this.speed > 10)
{
directionFactorLong = this.previousDirectionFactorLong;
directionFactorLat = rnd.Next(3) - 1;
this.previousDirectionFactorLat = directionFactorLat;
}
else
{
directionFactorLat = rnd.Next(3) - 1;
directionFactorLong = rnd.Next(3) - 1;
this.previousDirectionFactorLat = directionFactorLat;
this.previousDirectionFactorLong = directionFactorLong;
}
double latDistance = rnd.NextDouble() * distance * directionFactorLat;
double longDistance = Math.Sqrt((distance * distance) - (latDistance * latDistance)) * directionFactorLong;
GPSCoords newCoords = new GPSCoords
{
Latitude = carLatPosition + latDistance / milesPerDegreeLat,
Longitude = carLongPosition + longDistance / milesPerDegreeLong
};
return(newCoords);
}
public async void SendPatrolCarAlerts()
{
try
{
while (true)
{
double distance = 0;
if (!chasing)
{
// If not chasing a suspect vehicle, then just patrol the local area
distance = generateDistanceTravelled(this.locationReportingInterval);
}
else
{
// Close in on the suspect vehicle's last known location
distance = this.locationReportingInterval / this.speed;
GeoCoordinate patrolCarCoords = new GeoCoordinate(this.carLatPosition, this.carLongPosition);
// Determine the bearing of the suspect vehicle's last known location relative to the current location of the patrol car
// - very crude approximation - do we need to travel N, S, E or W?
if (this.carLatPosition != this.targetCoordinates.Latitude)
{
this.previousDirectionFactorLat = (this.carLatPosition < this.targetCoordinates.Latitude) ? 1 : -1;
}
if (this.carLongPosition != this.targetCoordinates.Longitude)
{
this.previousDirectionFactorLong = (this.carLongPosition < this.targetCoordinates.Longitude) ? 1 : -1;
}
// If the distance to a suspect vehicle location is less than 200 meters, treat it as intercepted for this simulation
if (patrolCarCoords.GetDistanceTo(this.targetCoordinates) < 200)
{
this.chasing = false;
Trace.TraceInformation($"ALERT ****** {this.carName} has intercepted suspect vehicle ******");
}
}
GPSCoords newLocation = calculateCoords(this.carLatPosition, this.carLongPosition, distance, this.milesPerDegreeLat, this.milesPerDegreeLong);
this.carLatPosition = newLocation.Latitude;
this.carLongPosition = newLocation.Longitude;
var alert = new PatrolCarLocationAlert()
{
CarID = this.carName,
CarNum = this.carNum,
LocationLatitude = this.carLatPosition,
LocationLongitude = this.carLongPosition,
Speed = this.speed,
Time = DateTime.UtcNow
};
var serializedAlert = JsonConvert.SerializeObject(alert);
var data = new Microsoft.Azure.Devices.Client.Message(Encoding.UTF8.GetBytes(serializedAlert));
data.Properties.Add("Type", $"Telemetry_{DateTime.Now.ToLongTimeString()}");
await this.deviceClient.SendEventAsync(data);
Trace.TraceInformation($"Sending: {alert.ToString()}");
await Task.Delay(this.locationReportingInterval * 1000);
}
}
catch (Exception e)
{
Trace.TraceError($"Error sending message: {e.Message}");
}
}