//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_CONVEXPLANERPOLYGON
#define OSG_CONVEXPLANERPOLYGON 1

#include <osg/Plane>

#include <vector>

namespace osg {

class BoundingBox;
class BoundingSphere;

/** A class for representing convex clipping volumes made up.
  * When adding planes, their normals should point inwards (into the volume) */
class SG_EXPORT ConvexPlanerPolygon
{

    public:

        inline ConvexPlanerPolygon() {}
                
        float area() { return _area; }
        
        const Vec3& center() { return _center; }
        
        const Vec3& normal() { return _normal; }

        typedef std::vector<osg::Vec3> VertexList;

        void add(const Vec3& v) { _vertexList.push_back(v); }
        
        VertexList& getVertexList() { return _vertexList; }
        
        const VertexList& getVertexList() const { return _vertexList; }
      
        void computeAttributes();
        
        void computeBound(BoundingBox& bb) const;

        void computeBound(BoundingSphere& bs) const;
        
    protected:

        float       _area;
        Vec3        _center;
        Vec3        _normal;
        VertexList _vertexList;

};

}	// end of namespace

#endif