/*
 * PVVMUD a 3D MUD
 * Copyright (C) 1998-1999  Programvareverkstedet (pvv@pvv.org)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#ifndef _SPLINE_H
#define _SPLINE_H

#include "keyframe.H"

class CSpline: public CInterpolate {
  CMatrix * m_basis;
public:
  CSpline(CMatrix * basis);

  virtual CVector interpolate(double time, ControlVector_t * controlVector);
 
  virtual CVector interpolate(double time, CMatrix & control);

};

////////////////////////////////////////////////////////////////////////////////
// Catmull-Rom
//   For N segments we need 4+(N-1) control vectors [0..K]
//   Line pass through all control vector except first and last.
//   s control the tension of the curve.
////////////////////////////////////////////////////////////////////////////////
class CCatmullRom : public CSpline{
public:
  CCatmullRom(double s = 1.0);

  virtual void addControlVector(CKeyFrame * keyFrame,
                                const ControlVector_t & controlVector);

};

////////////////////////////////////////////////////////////////////////////////
// Bezier
//   For N segments we need 4+3*(N-1) control vectors [0..K]
//   Line pass through every 4. control vector including first and last.
//   Every 2. and 3. points are used to control the curve form.
////////////////////////////////////////////////////////////////////////////////
class CBezier : public CSpline {
   static CMatrix m_bezier;
public:
  CBezier();

  virtual void addControlVector(CKeyFrame * keyFrame,
                                const ControlVector_t & controlVector);

};

////////////////////////////////////////////////////////////////////////////////
// Hermite
//   For N segments we need 4+2*(N-1) control vectors [0..K]
//   Line pass through every odd control vector. Every even contorl vector
//   is a tangent for the curve. 
////////////////////////////////////////////////////////////////////////////////
class CHermite : public CSpline {
  static CMatrix m_hermite;
public:
  CHermite();

  virtual void addControlVector(CKeyFrame * keyFrame,
                                const ControlVector_t & controlVector);

};

#endif // _SPLINE_H