/// <summary>
/// Creates a PCurve, a 2D curve parameterized in UV over
/// the surface.
/// </summary>
/// <param name="surface"></param>
/// <returns></returns>
public ICurve ToPCurve(ISurface surface)
{
var propsDouble = PropsDouble;
var knots = KnotVectorU;
var ctrlPtCoords = ControlPoints.SelectMany(p => p.ToDoubles()).ToArray();
#region debug
var param = surface.Parameterization2();
Debug.Assert(ControlPoints.All(c =>
c.X <param.UMax && c.X> param.UMin &&
c.Y <param.VMax && c.Y> param.VMin
));
#endregion
var pCurve = (ICurve)SwAddinBase.Active.Modeler.CreatePCurve(surface, propsDouble, knots, ctrlPtCoords);
Debug.Assert(pCurve != null);
return(pCurve);
}