72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
#include <osg/AnimationPath>
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#include <osg/NodeVisitor>
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using namespace osg;
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void AnimationPath::insert(double time,const ControlPoint& ControlPoint)
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{
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_timeControlPointMap[time] = ControlPoint;
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}
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bool AnimationPath::getInterpolatedControlPoint(double time,ControlPoint& controlPoint) const
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{
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if (_timeControlPointMap.empty()) return false;
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switch(_loopMode)
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{
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case(SWING):
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{
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double modulated_time = (time - getFirstTime())/(getPeriod()*2.0);
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double fraction_part = modulated_time - floor(modulated_time);
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if (fraction_part>0.5) fraction_part = 1.0-fraction_part;
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time = (fraction_part*2.0) * getPeriod();
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break;
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}
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case(LOOP):
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{
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double modulated_time = (time - getFirstTime())/getPeriod();
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double fraction_part = modulated_time - floor(modulated_time);
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time = fraction_part * getPeriod();
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break;
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}
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case(NO_LOOPING):
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// no need to modulate the time.
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break;
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}
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TimeControlPointMap::const_iterator second = _timeControlPointMap.lower_bound(time);
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if (second==_timeControlPointMap.begin())
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{
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controlPoint = second->second;
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}
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else if (second!=_timeControlPointMap.end())
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{
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TimeControlPointMap::const_iterator first = second;
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--first;
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// we have both a lower bound and the next item.
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// deta_time = second.time - first.time
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double delta_time = second->first - first->first;
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if (delta_time==0.0)
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controlPoint = first->second;
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else
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{
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controlPoint.interpolate((time - first->first)/delta_time,
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first->second,
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second->second);
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}
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}
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else // (second==_timeControlPointMap.end())
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{
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controlPoint = _timeControlPointMap.rbegin()->second;
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}
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return true;
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}
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