/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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 OSGUTIL_SIMPLIYFIER
#define OSGUTIL_SIMPLIYFIER 1

#include <osg/NodeVisitor>
#include <osg/Geode>
#include <osg/Geometry>

#include <osgUtil/Export>

namespace osgUtil {

/** A simplifier for reducing the number of traingles in osg::Geometry.
  */
class OSGUTIL_EXPORT Simplifier : public osg::NodeVisitor
{
    public:

        Simplifier(float sampleRatio=0.5f);
            
        virtual void apply(osg::Geode& geode)
        {
            for(unsigned int i=0;i<geode.getNumDrawables();++i)
            {
                osg::Geometry* geometry = geode.getDrawable(i)->asGeometry();
                if (geometry)
                {
                    simplify(*geometry,_sampleRatio);
                }
            }
        }

        /** simply the geometry to defined ratio of original size.*/
        void simplify(osg::Geometry& geometry, float sampleRatio);
        
        void simplify(osg::Geometry& geometry, unsigned int targetNumberOfTriangles);


    protected:
    
        float _sampleRatio;
    
};


}

#endif