//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_TRANSFORM
#define OSG_TRANSFORM 1

#include <osg/Group>
#include <osg/Matrix>

namespace osg {

/** Transform - is group which all children
    are transformed by the the Transform's osg::Matrix.  Typical uses
    of the Transform is for positioning objects within a scene or 
    producing trakerball functionality or for animation.
*/
class SG_EXPORT Transform : public Group
{
    public :
        Transform();
        Transform(const Matrix& matix);

        META_Node(Transform);

        /** Range of type that the Transform can be.*/
        enum Type
        {
            DYNAMIC,
            STATIC
        };
        
        /** Set the Transform Type, which can be DYNAMIC - the Marix
          * value is updated duing the main loop, or STATIC - the Matrix
          * is constant throughut the life of the main loop.  STATIC 
          * Transforms can be optimized away is some instances, which
          * can improve performanc so unless you plan to modify the
          * Matrix explicity set the Matrix to STATIC.  The default
          * value is DYNAMIC.*/
        inline void setType(Type type) { _type = type; }
        /** Get the Transform Type.*/
        inline const Type getType() const { return _type; }

        void setMatrix(const Matrix& mat );
        inline Matrix& getMatrix() { return *_matrix; }
        inline const Matrix& getMatrix() const { return *_matrix; }

        void preMult( const Matrix& mat );
        void preScale( const float sx, const float sy, const float sz );
        void preTranslate( const float tx, const float ty, const float tz );
        void preRotate( const float deg, const float x, const float y, const float z );

    
    protected :
    
        virtual ~Transform();
        
        virtual const bool computeBound() const;

        Type            _type;
        ref_ptr<Matrix> _matrix;
};

};

#endif