159 lines
4.9 KiB
C++
159 lines
4.9 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGSIM_BLINKSQUENCE
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#define OSGSIM_BLINKSQUENCE 1
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#include <osgSim/Export>
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#include <osg/Quat>
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#include <osg/Vec3>
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#include <osg/Vec4>
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#include <osg/ref_ptr>
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#include <vector>
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namespace osgSim {
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class OSGSIM_EXPORT BlinkSequence : public osg::Object
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{
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public:
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/** sequence group which can be used to synchronize related blink sequences.*/
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class OSGSIM_EXPORT SequenceGroup : public osg::Referenced
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{
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public:
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SequenceGroup();
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SequenceGroup(double baseTime);
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double _baseTime;
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};
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BlinkSequence();
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BlinkSequence(const BlinkSequence& bs, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
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META_Object(osgSim,BlinkSequence);
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/** add a pulse of specified color and duration to the BlinkSequence.*/
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inline void addPulse(double length,const osg::Vec4& color);
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/** get the total pulse period of the blink sequence, which is equal to the sum of all the pulse periods.*/
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inline double getPulsePeriod() const { return _pulsePeriod; }
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/** set the sequence group which can be used to synchronize related blink sequences.*/
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inline void setSequenceGroup(SequenceGroup* sg) { _sequenceGroup = sg; }
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/** get the non const sequence group.*/
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inline SequenceGroup* getSequenceGroup() { return _sequenceGroup.get(); }
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/** get the const sequence group.*/
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inline const SequenceGroup* getSequenceGroup() const { return _sequenceGroup.get(); }
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/** set the phase shift of the blink sequence, this would be used to shift a sequence within a sequence group.*/
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inline void setPhaseShift(double ps) { _phaseShift = ps; }
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/** get the pahse shift.*/
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inline double getPhaseShift() const { return _phaseShift; }
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/** compute the local time clamped to this BlinkSequences period, and accounting for the phase shift and sequence group.*/
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inline double localTime(double time) const;
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/** compute the color for the time interval sepecifed. Averages the colors if the length is greater than the current pulse.*/
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inline osg::Vec4 color(double time,double length) const;
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protected:
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typedef std::pair<double,osg::Vec4> IntervalColor;
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typedef std::vector<IntervalColor> PulseData;
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double _pulsePeriod;
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double _phaseShift;
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PulseData _pulseData;
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osg::ref_ptr<SequenceGroup> _sequenceGroup;
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};
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inline double BlinkSequence::localTime(double time) const
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{
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if (_sequenceGroup.valid()) time -= _sequenceGroup->_baseTime;
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time -= _phaseShift;
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return time - floor(time/_pulsePeriod)*_pulsePeriod;
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}
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inline void BlinkSequence::addPulse(double length,const osg::Vec4& color)
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{
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_pulseData.push_back(IntervalColor(length,color));
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_pulsePeriod += length;
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}
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inline osg::Vec4 BlinkSequence::color(double time,double length) const
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{
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if (_pulseData.empty()) return osg::Vec4(1.0f,1.0f,1.0f,1.0f);
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double lt = localTime(time);
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PulseData::const_iterator itr = _pulseData.begin();
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// find the first sample at this time point.
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while (lt>itr->first)
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{
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lt -= itr->first;
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++itr;
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if (itr==_pulseData.end()) itr = _pulseData.begin();
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}
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// if time interval fits inside the current pulse
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// then simply return this pulses color value.
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if (lt+length<=itr->first)
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{
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return itr->second;
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}
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// time length exceeds the current pulse therefore
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// we have to average out the pules to get the correct
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// results...
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// accumulate final part of the first active pulses.
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osg::Vec4 color(itr->second*(itr->first-lt));
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double len = length-(itr->first-lt);
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++itr;
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if (itr==_pulseData.end()) itr = _pulseData.begin();
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// accumulate all the whole pluses pulses.
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while (len>itr->first)
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{
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len -= itr->first;
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color += itr->second*itr->first;
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++itr;
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if (itr==_pulseData.end()) itr = _pulseData.begin();
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}
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// add remaining part of the final pulse.
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color += itr->second*len;
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// normalise the time waited color.
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color /= length;
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return color;
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}
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}
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#endif
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