public static double Distance(Vector2D coordinate1, Vector2D coordinate2)
{
double distance = 0.0;
var distanceCord = coordinate2 - coordinate1;
var a = Math.Pow(Math.Sin(ToRadian(distanceCord.X) / 2), 2)
+ Math.Cos(ToRadian(coordinate1.X)) * Math.Cos(ToRadian(coordinate2.X)) * Math.Pow(Math.Sin(ToRadian(distanceCord.Y) / 2), 2);
var c = 2 * Math.Atan2(Math.Pow(a, 0.5), Math.Pow(1 - a, 0.5));
var d = R_TH_BKK * c;
distance = d;
return distance;
}
//project this vector on to v, return signed magnatude
public Vector2D Project(Vector2D v, out double mag)
{
double thisDotV = this * v;
mag = thisDotV;
return v * thisDotV;
}
//negative
public static Vector2D operator -(Vector2D R)
{
Vector2D temp = new Vector2D(-R.X, -R.Y);
return temp;
}
//project this vector on to v
public Vector2D Project(Vector2D v)
{
double thisDotV = this * v;
return v * thisDotV;
}
