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Wednesday the 23rd of May 2012 @ 04:36pm

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LibN2L N2L Home Older News Downloads Documentation (n2l5) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Documentation (libN2L-4) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Bugtracker Project Page Report a Bug Bug List Related Things Life 2130 Devel Game Journal

LibN2L-4 Library Code Reference Classes Compounds Files Members Method Index Full Reference cOscillator.cpp Go to the documentation of this file. /************************************************************************ Nova-2 Library (libN2L, or simply n2l) Game development C++ Library Copyright (C) 2003 Aaron Cameron This library 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. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA A copy of the GNU Lesser General Public License has been provided with this library in the file 'COPYING'. Contact information for the author of this library has been provided with this library in the file 'AUTHOR'. ************************************************************************/ #include "cOscillator.h" #include "time.h" #include "constants.h" namespace n2l { const tHertz cOscillator::DefaultFrequency = 1.0f; /* ************************************************************************* */ cOscillator::cOscillator() : m_nextCycle(0), m_frequency(0), m_overrunBehaviour(OverrunBehaviour_Skip), m_warnOnOverrun(false), m_autoTrigger(AutoTrigger_TriggerOnRequest), m_timeStep(0) { setFrequency(DefaultFrequency); } /* ************************************************************************* */ cOscillator::cOscillator( const tHertz i_frequency, const tOverrunBehaviour i_ob ) : m_nextCycle(0), m_frequency(0), m_overrunBehaviour(i_ob), m_warnOnOverrun(false), m_autoTrigger(AutoTrigger_TriggerOnRequest), m_timeStep(0) { setFrequency(i_frequency); } /* ************************************************************************* */ cOscillator::~cOscillator() { } /* ************************************************************************* */ const tUint cOscillator::getTimeStepForFreq( const tHertz i_freq ) const { if (i_freq<=0) throw cOutOfBoundsException("cOscillator::getTimeStepForFreq","Negative or Zero Frequency"); return tUint((1000.0/i_freq)+0.5); } /* ************************************************************************* */ const bool cOscillator::isTime() { if (!m_frequency) return false; const tUint Ticks = getTicks(); if ( (m_warnOnOverrun) && (Ticks>=(m_nextCycle+m_timeStep)) ) throw cOverdueException(); if ( (AutoTrigger_TriggerOnRequest==m_autoTrigger)&&(Ticks>=m_nextCycle) ) { triggered(); return true; } else return (Ticks>=m_nextCycle); } /* ************************************************************************* */ void cOscillator::wait() { tSint waitTicks = timeLeft(); if (waitTicks>tSint(PlatformTimerGranularity)) n2l::delay(waitTicks-(waitTicks%PlatformTimerGranularity)); while (!isTime()); } /* ************************************************************************* */ const tSint cOscillator::timeLeft() const { return tSint(m_nextCycle)-tSint(getTicks()); } /* ************************************************************************* */ void cOscillator::setFrequency( const tHertz i_frequency ) { m_frequency = i_frequency; if (!m_frequency) { m_timeStep = 0; return; } m_timeStep = getTimeStepForFreq( i_frequency ); sync(); } /* ************************************************************************* */ void cOscillator::setOverrunBehaviour( const tOverrunBehaviour i_ob ) { m_overrunBehaviour = i_ob; } /* ************************************************************************* */ void cOscillator::setOverrunWarningFlag( const tBool i_flag ) { m_warnOnOverrun = i_flag; } /* ************************************************************************* */ void cOscillator::setAutoTrigger( const tAutoTrigger i_autoTrigger ) { m_autoTrigger = i_autoTrigger; } /* ************************************************************************* */ void cOscillator::sync() { m_nextCycle = getTicks()+m_timeStep; } /* ************************************************************************* */ void cOscillator::triggered() { if (OverrunBehaviour_Skip==m_overrunBehaviour) { const tUint Ticks = getTicks(); while (Ticks>=m_nextCycle) m_nextCycle += m_timeStep; } else m_nextCycle += m_timeStep; } } // namespace n2l

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