68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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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#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 = osg::UNINITIALIZED_FRAME_NUMBER;
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_previousTime = -1.0;
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_pause = false;
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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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double newTime = fs->getSimulationTime();
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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 (!_pause && nv->getTraversalNumber()!=_previousTraversalNumber)
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{
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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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}
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_previousTime = newTime;
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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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