PositionTimeTrack.cpp

/***************************************************************************
 *   This file is part of OpenCAL: Open Computer Animation Library         *
 *   I created OpenCAL as my master's thesis Computer Science (multimedia) *
 *   at the tUL university in Diepenbeek, Belgium                          *
 *                                                                         *
 *   Copyright (C) 2003-2004 by Jeroen Dierckx                             *
 *   jeroen.dierckx@student.luc.ac.be                                      *
 *                                                                         *
 ***************************************************************************/

// Includes
#include "PositionTimeTrack.h"
#include <OpenCAL/KeyFrameSystem.h>
using namespace OpenCAL;

using namespace std;


/******************************
* Constructors and destructor *
******************************/

PositionTimeTrack::PositionTimeTrack(KeyFrameSystem *keyFrameSystem, Vector3 *position)
: TimeTrack(keyFrameSystem), m_position(position)
{
}

PositionTimeTrack::~PositionTimeTrack()
{
}


/******************
* Other functions *
******************/

void PositionTimeTrack::addKeyFrame(float time, const Vector3 &value)
{
    m_keyFrames[time] = value;

    if(time > m_length)
        m_length = time;
}

void PositionTimeTrack::deleteKeyFrame(float time)
{
    KeyFrameMap::iterator it;
    for(it = m_keyFrames.begin(); it != m_keyFrames.end(); ++it)
        if(it->first == time)
        {
            m_keyFrames.erase(it);
            if(time == m_length)
                if(m_keyFrames.size() == 0)
                    m_length = 0.0f;
                else
                    m_length = m_keyFrames.rbegin()->first;
            return;
        }
}

void PositionTimeTrack::apply()
{
    float time = applySpeed();

    KeyFrameMap::iterator it = m_keyFrames.begin();
    while(it != m_keyFrames.end() && it->first < time)
        ++it;

    if(it == m_keyFrames.end()) return;


    float time2 = it->first;
    const Vector3 &value2 = it->second;
    --it;
    float time1 = it->first;
    const Vector3 &value1 = it->second;

    float u = (time - time1) / (time2 - time1);

    *m_position = value1.blended(u, value2);
}

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