19db0c1674
Vivek's email to osg-submissions: "I'm happy to release the osgdragger nodekit to the OSG community. I implemented the nodekit for my company, Fugro-Jason Inc., and they have kindly agreed to open source it. The nodekit contains a few draggers but it should be easy to build new draggers on top of it. The design of the nodekit is based on a SIGGRAPH 2002 course - "Design and Implementation of Direct Manipulation in 3D". You can find the course notes at http://www.pauliface.com/Sigg02/index.html. Reading pages 20 - 29 of the course notes should give you a fair understanding of how the nodekit works. The source code also contains an example of how to use the draggers."
96 lines
2.9 KiB
C++
96 lines
2.9 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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//osgManipulator - Copyright (C) 2007 Fugro-Jason B.V.
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#include <osgManipulator/Selection>
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#include <osgManipulator/Command>
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#include <algorithm>
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using namespace osgManipulator;
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class FindNodePathToRootVisitor : public osg::NodeVisitor
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{
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public:
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osg::NodePath& _nodePathToRoot;
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FindNodePathToRootVisitor(osg::NodePath& np)
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: osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_PARENTS),
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_nodePathToRoot(np)
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{}
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virtual void apply(osg::Node& node)
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{
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_nodePathToRoot.push_back(&node);
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traverse(node);
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}
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};
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void osgManipulator::computeNodePathToRoot(osg::Node& node, osg::NodePath& np)
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{
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np.clear();
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osg::ref_ptr<FindNodePathToRootVisitor> visitor = new FindNodePathToRootVisitor(np);
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node.accept(*visitor);
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np.pop_back();
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std::reverse(np.begin(), np.end());
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}
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Selection::Selection()
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{
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}
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Selection::~Selection()
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{
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}
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bool Selection::receive(const MotionCommand& command)
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{
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switch (command.getStage())
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{
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case MotionCommand::START:
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{
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// Save the current matrix
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_startMotionMatrix = getMatrix();
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// Get the LocalToWorld and WorldToLocal matrix for this node.
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osg::NodePath nodePathToRoot;
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computeNodePathToRoot(*this,nodePathToRoot);
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_localToWorld = osg::computeLocalToWorld(nodePathToRoot);
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_worldToLocal = osg::Matrix::inverse(_localToWorld);
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return true;
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}
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case MotionCommand::MOVE:
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{
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// Transform the command's motion matrix into local motion matrix.
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osg::Matrix localMotionMatrix = _localToWorld * command.getWorldToLocal()
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* command.getMotionMatrix()
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* command.getLocalToWorld() * _worldToLocal;
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// Transform by the localMotionMatrix
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setMatrix(localMotionMatrix * _startMotionMatrix);
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return true;
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}
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case MotionCommand::FINISH:
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{
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return true;
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}
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case MotionCommand::NONE:
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default:
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return false;
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}
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}
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