timeprovider.cpp

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/***************************************************************************
 *   Copyright (C) 2005-2019 by the FIFE team                              *
 *   http://www.fifengine.net                                              *
 *   This file is part of FIFE.                                            *
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 *   FIFE is free software; you can redistribute it and/or                 *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 of the License, or (at your option) any later version.    *
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 *   Lesser General Public License for more details.                       *
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 *   Free Software Foundation, Inc.,                                       *
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// Standard C++ library includes

// 3rd party library includes

// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "util/base/exception.h"
#include "util/time/timemanager.h"

#include "timeprovider.h"

namespace FIFE {
    TimeProvider::TimeProvider(TimeProvider* master): 
        m_master(master), 
        m_multiplier(1.0) {
        m_time_static = m_time_scaled = master ? master->getGameTime() : TimeManager::instance()->getTime();
    }
    
    TimeProvider::~TimeProvider() {}
    
    void TimeProvider::setMultiplier(float multiplier) { 
        if (multiplier < 0.0) {
            throw NotSupported("Negative time multiplier are not supported");
        }
        m_time_static = getPreciseGameTime();
        m_time_scaled = m_master ? m_master->getPreciseGameTime() : static_cast<float>(TimeManager::instance()->getTime());
        m_multiplier = multiplier;
    }
    
    float TimeProvider::getMultiplier() const { 
        return m_multiplier;
    }
    
    float TimeProvider::getTotalMultiplier() const {
        if (m_master) {
            return m_master->getTotalMultiplier() * m_multiplier;
        } else {
            return m_multiplier;
        }
    }
    
    uint32_t TimeProvider::getGameTime() const {
        return static_cast<uint32_t>(getPreciseGameTime());
    }
    
    double TimeProvider::getPreciseGameTime() const {
        return m_time_static + m_multiplier * ((m_master ? m_master->getPreciseGameTime() : static_cast<float>(TimeManager::instance()->getTime())) - m_time_scaled);
    }
    
    uint32_t scaleTime(float multiplier, uint32_t ticks) {
        return static_cast<uint32_t>(static_cast<float>(ticks) * multiplier);
    }
}