TimeTrack.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 "TimeTrack.h"
#include <OpenCAL/KeyFrameSystem.h>
using namespace OpenCAL;
using namespace Utils;

using namespace std;


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

TimeTrack::TimeTrack(KeyFrameSystem *keyFrameSystem)
: m_keyFrameSystem(keyFrameSystem)
, m_currentTime(0.0f), m_length(0.0f)
, m_loop(true), m_stopped(false)
{
    keyFrameSystem->addTimeTrack(this);
}

TimeTrack::~TimeTrack()
{
    m_keyFrameSystem->deleteTimeTrack(this);
}


/************************
* Get and set functions *
************************/


/**************************
* Time stepping functions *
**************************/

void TimeTrack::step(float deltaSeconds)
{
    if(m_stopped) return;

    m_currentTime += deltaSeconds;

    if(m_currentTime > m_length)
        if(m_loop)
        {
            while(m_currentTime > m_length)
                m_currentTime -= m_length;
        }
        else
        {
            m_currentTime = m_length;
            m_stopped = true;
        }

    apply();
}

void TimeTrack::rewind()
{
    m_currentTime = 0.0f;
    apply();
}

void TimeTrack::setTime(float time)
{
    m_currentTime = time;

    if(m_currentTime > m_length)
        if(m_loop)
        {
            while(m_currentTime > m_length)
                m_currentTime -= m_length;
        }
        else
            m_currentTime = m_length;

    apply();
}


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


/**********************
* Protected functions *
**********************/

float TimeTrack::applySpeed() const
{
    // Normalize the current time between 0 and 1
    float t = m_currentTime / m_length;

    return (sinf(t * Math::pi - Math::pi * 0.5f) + 1.0f) * 0.5f * m_length;
}

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