/*
-----------------------------------------------------------------------------
This source file is part of OGRE 
	(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under 
the terms of the GNU Lesser General Public License as published by the Free Software 
Foundation; either version 2 of the License, or (at your option) any later 
version.

This program 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 GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with 
this program; if not, write to the Free Software Foundation, Inc., 59 Temple 
Place - Suite 330, Boston, MA 02111-1307, USA, or go to 
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/
#ifndef __ScaleAffector_H__
#define __ScaleAffector_H__

#include "OgreParticleFXPrerequisites.h"
#include "OgreParticleAffector.h"
#include "OgreStringInterface.h"

namespace Ogre {


    /** This plugin subclass of ParticleAffector allows you to alter the scale of particles.
    @remarks
        This class supplies the ParticleAffector implementation required to make the particle expand
		or contract in mid-flight.
    */
    class _OgreParticleFXExport ScaleAffector : public ParticleAffector
    {
    public:

        /** Command object for scale adjust (see ParamCommand).*/
        class CmdScaleAdjust : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };

        /** Default constructor. */
        ScaleAffector(ParticleSystem* psys);

        /** See ParticleAffector. */
        void _affectParticles(ParticleSystem* pSystem, Real timeElapsed);

        /** Sets the scale adjustment to be made per second to particles. 
        @param Rate
            Sets the adjustment to be made to the x and y scale components per second. These
            values will be added to the scale of all particles every second, scaled over each frame
            for a smooth adjustment.
        */
        void setAdjust( Real rate );

        /** Gets the scale adjustment to be made per second to particles. */
        Real getAdjust(void) const;

        static CmdScaleAdjust msScaleCmd;

    protected:
        Real mScaleAdj;

    };


}


#endif

