52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
#include <osg/MatrixTransform>
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#include <osgUtil/TransformCallback>
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using namespace osgUtil;
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TransformCallback::TransformCallback(const osg::Vec3& pivot,const osg::Vec3& axis,float angularVelocity)
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{
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_pivot = pivot;
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_axis = axis;
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_angular_velocity = angularVelocity;
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_previousTraversalNumber = -1;
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_previousTime = -1.0;
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}
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void TransformCallback::operator() (osg::Node* node, osg::NodeVisitor* nv)
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{
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osg::MatrixTransform* transform = dynamic_cast<osg::MatrixTransform*>(node);
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if (nv && transform)
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{
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const osg::FrameStamp* fs = nv->getFrameStamp();
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if (!fs) return; // not frame stamp, no handle on the time so can't move.
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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 newTime = fs->getReferenceTime();
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float delta_angle = _angular_velocity*(newTime-_previousTime);
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osg::Matrix mat = osg::Matrix::translate(-_pivot)*
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osg::Matrix::rotate(delta_angle,_axis)*
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osg::Matrix::translate(_pivot);
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// update the specified transform
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transform->preMult(mat);
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_previousTraversalNumber = nv->getTraversalNumber();
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_previousTime = newTime;
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}
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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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