cxPlaybackTime.cpp

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

Redistribution and use in source and binary forms, with or without 
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, 
   this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, 
   this list of conditions and the following disclaimer in the documentation 
   and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors 
   may be used to endorse or promote products derived from this software 
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
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=========================================================================*/

#include "cxPlaybackTime.h"
#include <iostream>
#include "cxTime.h"
#include "cxTypeConversions.h"

#include "cxVector3D.h"

namespace cx
{

PlaybackTime::PlaybackTime()
{
        mStartTime = QDateTime::currentDateTime();
        mOffset = 0;
        mLength = 10000;
        mSpeed = 1.0;

        mTimer = new QTimer;
        connect(mTimer, SIGNAL(timeout()), this, SLOT(timeoutSlot()));
        mTimer->setInterval(40);
}

void PlaybackTime::initialize(QDateTime start, qint64 length)
{
        this->stop();
        mStartTime = start;
        mLength = length;

//      report(QString("Initialized PlaybackTime with start time [%1] and end time [%2]")
//                                      .arg(mStartTime.toString(timestampMilliSecondsFormatNice()))
//                                      .arg(mStartTime.addMSecs(mLength).toString(timestampMilliSecondsFormatNice())));
}

PlaybackTime::~PlaybackTime()
{
        delete mTimer;
}

bool PlaybackTime::isPlaying() const
{
        return mTimer->isActive();
}

void PlaybackTime::start()
{
        mPlayStart = QDateTime::currentDateTime();
        mLastPlayOffset = mOffset;
//      mStartTime = QDateTime::currentDateTime();
        mTimer->start();
        this->timeoutSlot();
}

void PlaybackTime::stop()
{
        mTimer->stop();
        mOffset = 0;
        this->timeoutSlot();
}

void PlaybackTime::pause()
{
        mOffset = this->getOffset();
        mTimer->stop();
        this->timeoutSlot();
}

qint64 PlaybackTime::getOffset() const
{
        if (mTimer->isActive())
        {
                // find the offset from the last start to now.
                qint64 offset = mPlayStart.msecsTo(QDateTime::currentDateTime());
                return mLastPlayOffset + mSpeed * offset;
        }
        else
        {
                return mOffset;
        }
}

void PlaybackTime::timeoutSlot()
{
        // find the offset from the last start to now. Use to update mOffset.
//      int offset = mPlayStart.msecsTo(QDateTime::currentDateTime());
//      mOffset = mLastPlayOffset + offset;
//      mOffset = this->getOffset(); // do we need this???

//      int secs = mOffset; // SmStartTime.secsTo(QDateTime::currentDateTime());

//      QString text = QString("<font size=%1 color=%2><b>%3 ms</b></font>").arg(mFontSize).arg(color).arg(secs);
//      std::cout << mOffset << std::endl;

        if (this->getOffset() > mLength)
        {
                // similar to pause(), except dont call timeout recusively
                mOffset = mLength;
                mTimer->stop();
        }
        else
                emit changed();
}


void PlaybackTime::forward(qint64 msecs)
{
        this->moveOffset(msecs);
}

void PlaybackTime::rewind(qint64 msecs)
{
        this->moveOffset(-msecs);
}

void PlaybackTime::moveOffset(qint64 delta)
{
        this->setOffset(this->getOffset()+delta);
}

void PlaybackTime::setTime(QDateTime time)
{
        this->setOffset(this->getStartTime().msecsTo(time));
}

QDateTime PlaybackTime::getTime() const
{
//      std::cout << "gettime " << this->getStartTime().addMSecs(this->getOffset()).toString(timestampMilliSecondsFormatNice()) << std::endl;

        return this->getStartTime().addMSecs(this->getOffset());
}

struct TemporaryPausePlay
{
        TemporaryPausePlay(PlaybackTime* base) : mBase(base)
        {
                mPlaying = mBase->isPlaying();
                if (mPlaying)
                        mBase->pause();
        }
        ~TemporaryPausePlay()
        {
                if (mPlaying)
                        mBase->start();
        }
        bool mPlaying;
        PlaybackTime* mBase;
};

void PlaybackTime::setOffset(qint64 val)
{
        if (val==mOffset)
                return;

        TemporaryPausePlay sentry(this);

        mOffset = std::max<quint64>(0, val);
        this->timeoutSlot();
}

qint64 PlaybackTime::getLength() const
{
        return mLength;
}

QDateTime PlaybackTime::getStartTime() const
{
        return mStartTime;
}

void PlaybackTime::setSpeed(double val)
{
        TemporaryPausePlay sentry(this);
        mSpeed = val;
}

double PlaybackTime::getSpeed() const
{
        return mSpeed;
}

void PlaybackTime::setResolution(qint64 val)
{
        mTimer->setInterval(val);
}

double PlaybackTime::getResolution()
{
        return mTimer->interval();
}

//---------------------------------------------------------
//---------------------------------------------------------
//---------------------------------------------------------

//---------------------------------------------------------
//---------------------------------------------------------
//---------------------------------------------------------


bool TimelineEvent::isInside(double time, double tol_ms) const
{
        double w = mEndTime - mStartTime;
        double m = mStartTime + w/2;
        return fabs(time - m) < std::max(w, tol_ms)/2;
}
bool TimelineEvent::isSingular() const { return similar(mEndTime,mStartTime); }
bool TimelineEvent::isOverlap(const TimelineEvent& rhs) const
{
        double w0 = mEndTime - mStartTime;
        double m0 = mStartTime + w0/2;
        double w1 = rhs.mEndTime - rhs.mStartTime;
        double m1 = rhs.mStartTime + w1/2;
        return fabs(m1-m0) < (w1+w0)/2;
}
bool TimelineEvent::operator<(const TimelineEvent& rhs) const
{
        return mStartTime < rhs.mStartTime;
}


} /* namespace cx */