Gets or sets the direction of the x-axis of this plane. Setting the x-axis results in a reculculation of the y-axis to make the axis perpendicular.

public GeoVector DirectionX { get; set; }

Public Property DirectionX As GeoVector
	Get
	Set

public:
property GeoVector DirectionX {
	GeoVector get ();
	void set (GeoVector value);
}