/*
* This method assumes that the memberLocations collection only
* applies to members applicable for proximity detection. In other words,
* non-team-mates must be filtered out before using this method.
* distance threshold is in Kilometers.
*/
public ICollection <ProximityDetectedEvent> DetectProximityEvents(
MemberLocationRecordedEvent memberLocationEvent,
ICollection <MemberLocation> memberLocations,
double distanceThreshold)
{
GpsUtility gpsUtility = new GpsUtility();
GpsCoordinate sourceCoordinate = new GpsCoordinate()
{
Latitude = memberLocationEvent.Latitude,
Longitude = memberLocationEvent.Longitude
};
return(memberLocations.Where(
ml => ml.MemberID != memberLocationEvent.MemberID &&
gpsUtility.DistanceBetweenPoints(sourceCoordinate, ml.Location) < distanceThreshold)
.Select(ml => {
return new ProximityDetectedEvent()
{
SourceMemberID = memberLocationEvent.MemberID,
TargetMemberID = ml.MemberID,
TeamID = memberLocationEvent.TeamID,
DetectionTime = DateTime.UtcNow.Ticks,
SourceMemberLocation = sourceCoordinate,
TargetMemberLocation = ml.Location,
MemberDistance = gpsUtility.DistanceBetweenPoints(sourceCoordinate, ml.Location)
};
}).ToList());
}
public void ProducesAccurateDistanceMeasurements()
{
GpsUtility gpsUtility = new GpsUtility();
double distance = gpsUtility.DistanceBetweenPoints(LosAngeles, NewYorkCity);
Assert.Equal(3933, Math.Round(distance)); // 3,933 km
Assert.Equal(0, gpsUtility.DistanceBetweenPoints(LosAngeles, LosAngeles));
}
public void ProducesAccurateDistanceMeasurements()
{
var gpsUtility = new GpsUtility();
var losAngelesCoordinate = new GpsCoordinate{
Latitude = 34.0522222,
Longitude = -118.2427778
};
var newYorkCoordinate = new GpsCoordinate{
Latitude = 40.7141667,
Longitude = -74.0063889
};
var distance = gpsUtility.DistanceBetweenPoints(losAngelesCoordinate, newYorkCoordinate);
Assert.Equal(3933, Math.Round(distance));
Assert.Equal(0, gpsUtility.DistanceBetweenPoints(losAngelesCoordinate, losAngelesCoordinate));
}
