/// <summary> Subtract one vector from another
///
/// </summary>
/// <param name="a">The vector to be subtracted from
/// </param>
/// <param name="b">The vector to subtract
/// </param>
/// <returns> A newly created containing the result
/// </returns>
public static Vector2f Sub(ROVector2f a, ROVector2f b)
{
Vector2f temp = new Vector2f(a);
temp.Sub(b);
return temp;
}
/// <summary> Get the normal of a line x y (or edge).
/// When standing on x facing y, the normal will point
/// to the left.
///
/// TODO: Move this function somewhere else?
///
/// </summary>
/// <param name="x">startingpoint of the line
/// </param>
/// <param name="y">endpoint of the line
/// </param>
/// <returns> a (normalised) normal
/// </returns>
public static Vector2f GetNormal(ROVector2f x, ROVector2f y)
{
Vector2f normal = new Vector2f(y);
normal.Sub(x);
normal = new Vector2f(normal.y, - normal.x);
normal.Normalise();
return normal;
}
