/*
 * 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
 *
 */

#include "pvvmud.H"
#include "keyframe.H"

CInterpolate::CInterpolate(){
}

void CInterpolate::addControlVector(CKeyFrame * keyFrame,
                                    const ControlVector_t & controlVector)
{
  for (int index = 0; index < controlVector.size(); index++){
    keyFrame->addControlVector(controlVector[index]);
  }
}

CVector CInterpolate::interpolate(double time, ControlVector_t * controlVector){
  int size = (*controlVector).size();
  if (size == 0) return CVector(0.0,0.0,0.0);
  if (size == 1) return (*controlVector)[0];
  int start = (int)floor((size-1) * time);
  int stop = start + 1;
  time = (size-1)*time-start;
  return interpolate(start,time,controlVector);
}

CVector CInterpolate::interpolate(int start, double time, 
                                  ControlVector_t * controlVector)
{
  return (*controlVector)[start] 
         + ((*controlVector)[start+1]-(*controlVector)[start])*time;
}

CKeyFrame::CKeyFrame(CInterpolate * interpolate){
  m_controlVector = new ControlVector_t();
  m_interpolate = interpolate;
}

CKeyFrame::~CKeyFrame(){
  delete m_controlVector;
  delete m_interpolate;
}

void CKeyFrame::addControlVector(const CVector & vector){
  m_controlVector->push_back(vector);
}

void CKeyFrame::addControlVector(const ControlVector_t & controlVector){
  m_interpolate->addControlVector(this,controlVector);
}

CVector CKeyFrame::interpolate(double time){
  return m_interpolate->interpolate(time, m_controlVector);
}