/// <summary>
/// Returns distance between this and another point.
/// </summary>
/// <param name="?"></param>
public double DistanceFrom(PointTwoD other)
{
double difx = this.X - other.X;
double dify = this.Y - other.Y;
return(Math.Sqrt(difx * difx + dify * dify));
}
/// <summary>
/// Creates an instance of the PointTwoD as a copy of the given instance.
/// </summary>
public PointTwoD(PointTwoD point)
: this(point.X, point.Y)
{
}