/// <summary>
/// Get the straight-line distance between two points.
/// </summary>
/// <param name="origin">Starting point.</param>
/// <param name="destination">Ending point.</param>
/// <returns></returns>
public static double DistanceTo(this Position origin, Position destination)
{
int xDiff = origin.X - destination.X;
int yDiff = origin.Y - destination.Y;
double a2 = xDiff * xDiff;
double b2 = yDiff * yDiff;
return Math.Sqrt(Math.Abs(a2 + b2));
}
public void CheckY()
{
Position position = new Position(0, 0);
position = position.SetY(5);
Assert.AreEqual(5, position.Y);
}
public void CheckX()
{
Position position = new Position(0, 0);
position = position.SetX(5);
Assert.AreEqual(5, position.X);
}
public void CalculateVertical()
{
Position start = new Position(0, 0);
Position end = new Position(0, 5);
Assert.AreEqual(5, start.DistanceTo(end));
}
public void CalculateHorizontal()
{
Position start = new Position(0, 0);
Position end = new Position(5, 0);
Assert.AreEqual(5, start.DistanceTo(end));
}
public void CalculateDiagonal()
{
Position start = new Position(0, 0);
Position end = new Position(3, 4);
Assert.AreEqual(5, start.DistanceTo(end));
}