OCCT

// Created on: 1991-09-09
// Created by: Michel Chauvat
// Copyright (c) 1991-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _CSLib_DerivativeStatus_HeaderFile
#define _CSLib_DerivativeStatus_HeaderFile

//! D1uIsNull : ||D1U|| <= Resolution
//!
//! D1vIsNull : ||D1V|| <= Resolution
//!
//! D1IsNull  : the first derivatives in the U and V parametric
//! directions have null length  :
//! ||D1U|| <= Resolution and ||D1V|| <= Resolution
//!
//! D1uD1vRatioIsNull : the first derivative in the U direction has
//! null length by comparison with the derivative
//! in the V direction
//! ||D1U|| / ||D1V|| <= RealEpsilon
//!
//! D1vD1uRatioIsNull : the first derivative in the V direction has
//! null length by comparison with the derivative
//! in the U direction
//! ||D1V|| / ||D1U|| <= RealEpsilon
//!
//! D1uIsParallelD1v : the angle between the derivatives in the U and
//! V direction is null (tolerance criterion given
//! as input data)
enum CSLib_DerivativeStatus
{
  CSLib_Done,
  CSLib_D1uIsNull,
  CSLib_D1vIsNull,
  CSLib_D1IsNull,
  CSLib_D1uD1vRatioIsNull,
  CSLib_D1vD1uRatioIsNull,
  CSLib_D1uIsParallelD1v
};

#endif // _CSLib_DerivativeStatus_HeaderFile