DtOsgRibbon.h

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/*****************************************************************************
 * Copyright (c) 2012 MAK Technologies, Inc.
 * All rights reserved.
 *****************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <osg/MatrixTransform>
#include <osg/Group>
#include <osg/Geode>

namespace makVrv
{

   class DT_DLL_VRVOSG DtOsgRibbon : public osg::Group
   {
   public:

      DtOsgRibbon();

      DtOsgRibbon( float segmentSpacing, const osg::Vec4& color,
         float maxLength = 2000 );

      virtual ~DtOsgRibbon();

      virtual void traverse( osg::NodeVisitor& nv );

      virtual osg::Node* node();

      virtual void setColor( const osg::Vec4& color );

      const osg::Vec4& color() const { return myColor; }

      virtual void setDroppedPoints( const osg::Vec3d& pointA, const osg::Vec3d& pointB );

      virtual void update( double dt, double simTime );

      virtual void update() {};

      virtual void setMaxSegments( long segments );

      inline long maxSegments() const { return myMaxSegments; }

      virtual void setSegmentSpacing( float spacing );

      inline float segmentSpacing() const { return mySegmentSpacing; }

   protected:

      virtual void addParticle( osg::Vec3d const& left, osg::Vec3d const& right,
         double simTime ) = 0;

      virtual float currentSegmentLength() = 0;

      virtual void extendCurrentSegment( osg::Vec3d const& left,
         osg::Vec3d const& right, double simTime ) = 0;

      virtual osg::Drawable* getDrawable() = 0;

      virtual osg::Geode* createGeode();

      virtual void setDrawable();

   private:

      osg::ref_ptr<osg::MatrixTransform> myPositionNode;
      osg::ref_ptr<osg::Geode> myGeode;
      osg::Matrixd myWorldTransformInv;
      osg::Matrixd myLastLocalToWork;

      int myLastUpdatedFrame;
      double myLastUpdateTime;

      long myMaxSegments;
      float mySegmentSpacingSquared;
      float mySegmentSpacing;

      osg::Vec3d myLocalPointA;
      osg::Vec3d myLocalPointB;

      osg::Vec4 myColor;
      bool myFirstUpdate;

   };

}