54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
#include <osg/MatrixTransform>
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#include "ShuttleCallback.h"
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ShuttleCallback::ShuttleCallback(const osg::Vec3& startPos,
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const osg::Vec3& endPos,
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float frequency)
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{
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_startPos = startPos;
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_endPos = endPos;
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_frequency = frequency;
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_previousTraversalNumber = -1;
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_previousTime = -1.0;
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_angle = 0.0;
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}
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void ShuttleCallback::operator() (osg::Node* node, osg::NodeVisitor* nv)
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{
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if (!nv)
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return;
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osg::MatrixTransform* transform = dynamic_cast<osg::MatrixTransform*>(node);
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if (!transform)
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return;
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const osg::FrameStamp* fs = nv->getFrameStamp();
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if (!fs)
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return;
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// ensure that we do not operate on this node more than
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// once during this traversal. This is an issue since node
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// can be shared between multiple parents.
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if (nv->getTraversalNumber()!=_previousTraversalNumber)
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{
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double currentTime = fs->getReferenceTime();
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_angle += (currentTime - _previousTime) * 2 * osg::PI * _frequency;
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double frac = 0.5 + 0.5 * sin(_angle);
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osg::Vec3 position = _startPos * (1.0 - frac) + _endPos * frac;
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// update the specified transform
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transform->setMatrix(osg::Matrix::translate(position));
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_previousTraversalNumber = nv->getTraversalNumber();
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_previousTime = currentTime;
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}
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// must call any nested node callbacks and continue subgraph traversal.
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traverse(node,nv);
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}
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