public Ghost(GeoCoordinate position)
{
Position = position;
StartPosition.Location = position;
_heading = CoarseHeading.InvalidHeading;
_random = new Random();
DistanceToPlayer = Double.PositiveInfinity;
}
void MaybeSwitchDirection(GeoCoordinate userPosition)
{
int rnd;
switch (_heading)
{
case CoarseHeading.InvalidHeading:
// Need to generate a new heading
// 50/50 random choice
rnd = _random.Next(2);
if (rnd == 0)
{
_heading = CoarseHeading.Longitude;
}
else
{
_heading = CoarseHeading.Latitude;
}
break;
case CoarseHeading.Latitude:
case CoarseHeading.Longitude:
// Check if there only exists one direction to the user
GeoCoordinate userLatitude = new GeoCoordinate(userPosition.Latitude, Position.Longitude);
GeoCoordinate userLongitude = new GeoCoordinate(Position.Latitude, userPosition.Longitude);
if (userLatitude.GetDistanceTo(Position) < Epsilon)
{
_heading = CoarseHeading.Longitude;
}
else if (userLongitude.GetDistanceTo(Position) < Epsilon)
{
_heading = CoarseHeading.Latitude;
}
else
{
// Two possible directions, maybe change direction
// Likelihood of changing direction is 2%
rnd = _random.Next(100);
if (rnd < 2)
{
if (_heading == CoarseHeading.Longitude)
{
_heading = CoarseHeading.Latitude;
}
else
{
_heading = CoarseHeading.Longitude;
}
}
}
break;
}
}
