public static IAuto <Arrow> Rotate(this Arrow axis)
{
axis.CheckUnit();
return(new Auto <Arrow>(
morphF: arrow =>
{
var projection = axis.Scale((Sign)axis.Dot(arrow));
return axis.Cross(arrow).Add(projection);
}));
}
public FaceTurn(Arrow axis)
{
axis.CheckUnit();
this.Axis = axis;
}
public static void Check(this CubieFace face, Arrow direction)
{
direction.CheckUnit();
face.Face.CheckPerpendicular(direction);
}
