// Any point with a latitude or longitude beyond the playfield is cold.
// Any point with a latitude and longitude within a 5% (of the total playfield)
// area around the current waypoint is considered hot.
public int GetTemp( GeoCoordinate userLocation, GeoCoordinate lastLocation = null)
{
if (this.currentWaypoint == null)
{
throw new NullReferenceException("A current waypoint must be explicitly set.");
}
// Hot zone
double hotZoneHalfWidth = playfield.Width * 0.025; // 5% of playfield width (halved)
double hotZoneHalfHeight = playfield.Height * 0.025; // 5% of playfield height (halved)
double hotWest = this.currentWaypoint.Latitude - hotZoneHalfWidth;
double hotEast = this.currentWaypoint.Latitude + hotZoneHalfWidth;
double hotNorth = this.currentWaypoint.Longitude + hotZoneHalfHeight;
double hotSouth = this.currentWaypoint.Longitude - hotZoneHalfHeight;
GeoArea hotZone = new GeoArea(hotWest, hotEast, hotNorth, hotSouth);
/*
// User is hot
if (hotZone.LocationInside(userLocation))
{
return 0;
}
// User is cold
else if (playfield.LocationOutside(userLocation))
{
return 1;
}
*/
// User is neither hot nor cold.
// Are they colder?
if (lastLocation != null && Further(userLocation, lastLocation))
{
return 2;
}
// Are they warmer?
else if (lastLocation != null && Closer(userLocation, lastLocation))
{
return 3;
}
// They haven't moved toward or away?
else if (lastLocation != null)
{
return 4;
}
// No last location (probably the first check)
else
{
return 5;
}
}
public HotnessDetector(HashSet<double> allLatitudes, HashSet<double> allLongitudes)
{
// Get the entire list of waypoints within a single hunt
// (or at least every latitude and longitude)
// and determine the bounds of the playfield.
// The playfield width is determined from the eastmost latitude
// of the waypoints and the westmost latitude of the waypoints.
// The playfield height is determined from the northernmost longitude
// of the waypoints and the southernmost longitude of the waypoints.
playfield = new GeoArea(allLongitudes.Min(), allLongitudes.Max(), allLatitudes.Max(), allLatitudes.Min());
}
