TransformAccumulator.hpp

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/***********************************
   Copyright 2018 Ravishankar Mathur

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
***********************************/

#ifndef _OF_TRANSFORMACCUMULATOR_
#define _OF_TRANSFORMACCUMULATOR_

#include <OpenFrames/Export.h>
#include <OpenFrames/DescendantTracker.hpp>

#include <osg/Matrix>
#include <osg/NodeVisitor>
#include <osg/Referenced>
#include <osg/ref_ptr>

namespace OpenFrames
{
  class ReferenceFrame;

  class OF_EXPORT TransformVisitor : public osg::NodeVisitor
  {
  public:
    enum CoordMode
    {
      WORLD_TO_LOCAL,
      LOCAL_TO_WORLD
    };

    TransformVisitor();

    virtual void apply(osg::Transform& transform);
    void accumulate(const FramePath &framePath);

    CoordMode _coordMode;
    osg::Matrixd _matrix;

  protected:
    virtual ~TransformVisitor();

    FramePath::const_iterator _itr;
  };

  class OF_EXPORT TransformAccumulator : public osg::Referenced
  {
  public:
    TransformAccumulator();
    TransformAccumulator( ReferenceFrame* root, ReferenceFrame* frame );

    ReferenceFrame* getRoot();
    void setRoot( ReferenceFrame* root );

    ReferenceFrame* getOrigin();
    bool setOrigin( ReferenceFrame* frame );

    bool isValid();

    osg::Matrixd& getLocalToWorld();

    osg::Matrixd& getWorldToLocal();

  protected:
    virtual ~TransformAccumulator();
    void _init();

      // FramePath from the root to the origin frame
    osg::ref_ptr<DescendantTracker> _lookAtPath;

      // NodeVisitor that computes the transform from root to origin
    osg::ref_ptr<TransformVisitor> _transformVisitor;
  }; // !class TransformAccumulator

}  // !namespace OpenFrames

#endif  // !_OF_TRANSFORMACCUMULATOR_