DtOsgRibbon.h

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/*****************************************************************************
 * Copyright (c) 2013 MAK Technologies, Inc.
 * All rights reserved.
 *****************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <osg/MatrixTransform>
#include <osg/Group>
#include <osg/Geode>
#include <osg/Vec3>
#include <osg/Vec4>

namespace makVrv
{

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

      DtOsgRibbon(
         DtDe& de,
         float segmentSpacing = 1.0,
         const osg::Vec4& color = osg::Vec4d(0.5, 0.5, 0.5, 1.0),
         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; }

      // Set ribbon to be stippled or alpha-blended.
      virtual void setStippled(bool stippled);

      inline bool isStippled() const { return myStippled; }

   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;
      bool myStippled;

      DtDe& myDe;
   };

}