/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGTERRAIN_TERRAINNODE
#define OSGTERRAIN_TERRAINNODE 1

#include <osg/Group>
#include <osg/CoordinateSystemNode>
#include <osg/TransferFunction>

#include <osgTerrain/TerrainTechnique>
#include <osgTerrain/Layer>
#include <osgTerrain/Locator>

namespace osgTerrain {

/** Terrain provides a framework for loosly coupling height field data with height rendering algorithms.
  * This allows TerrainTechnique's to be pluged in at runtime.*/
class OSGTERRAIN_EXPORT TerrainNode : public osg::Group
{
    public:

        TerrainNode();
        
        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        TerrainNode(const TerrainNode&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);

        META_Node(osgTerrain, TerrainNode);

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


        /** Set the TerrainTechnique*/
        void setTerrainTechnique(osgTerrain::TerrainTechnique* TerrainTechnique);

        /** Get the TerrainTechnique*/
        TerrainTechnique* getTerrainTechnique() { return _terrainTechnique.get(); }
        
        /** Get the const TerrainTechnique*/
        const TerrainTechnique* getTerrainTechnique() const { return _terrainTechnique.get(); }


        /** Set the coordinate frame locator of the terrain node.
          * The locator takes non-dimensional s,t coordinates into the X,Y,Z world coords and back.*/
        void setLocator(Locator* locator) { _locator = locator; }

        /** Get the coordinate frame locator of the terrain node.*/
        Locator* getLocator() { return _locator.get(); }

        /** Get the coordinate frame locator of the terrain node.*/
        const Locator* getLocator() const { return _locator.get(); }


        void setElevationLayer(Layer* layer);
        Layer* getElevationLayer() { return _elevationLayer.get(); }
        const Layer* getElevationLayer() const { return _elevationLayer.get(); }
        
        void setColorLayer(osgTerrain::Layer* layer);
        Layer* getColorLayer() { return _colorLayer.get(); }
        const Layer* getColorLayer() const { return _colorLayer.get(); }
        
        void setColorTransferFunction(osg::TransferFunction* tf);
        osg::TransferFunction* getColorTransferFunction() { return _colorTransferFunction.get(); }
        const osg::TransferFunction* getColorTransferFunction() const { return _colorTransferFunction.get(); }

    protected:

        virtual ~TerrainNode();

        osg::ref_ptr<TerrainTechnique>      _terrainTechnique;
        osg::ref_ptr<Locator>               _locator;
        
        osg::ref_ptr<Layer>                 _elevationLayer;

        osg::ref_ptr<Layer>                 _colorLayer;
        osg::ref_ptr<osg::TransferFunction> _colorTransferFunction;
};

}

#endif