private double calcCrossProduct(LocationMark origin, LocationMark p2)
{
return((p2.Latitude - origin.Latitude) * (this.Longitude - origin.Longitude)
- (p2.Longitude - origin.Longitude) * (this.Latitude - origin.Latitude));
}
public double DistanceToLine(LocationMark a, LocationMark b)
{
return(Math.Abs((b.Longitude - a.Longitude) * (a.Latitude - this.Latitude) - (a.Longitude - this.Longitude) * (b.Latitude - a.Latitude))
/ Math.Sqrt(Math.Pow(b.Longitude - a.Longitude, 2) + Math.Pow(b.Latitude - a.Latitude, 2)));
}
public bool IsLeftOfLine(LocationMark from, LocationMark to)
{
return(calcCrossProduct(from, to).CompareTo(0) > 0);
}