/*

-----------------------------------------------------------------------------

This source file is part of OGRE

    (Object-oriented Graphics Rendering Engine)

For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

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*/

#ifndef __AreaEmitter_H__

#define __AreaEmitter_H__

#include "OgreParticleFXPrerequisites.h"

#include "OgreParticleEmitter.h"

namespace Ogre {

    /** \addtogroup Plugins Plugins

    *  @{

    */

    /** \defgroup ParticleFX ParticleFX

    * Provides Emmiter and Affector implementations for ParticleSystem

    *  @{

    */

    /** Particle emitter which emits particles randomly from points inside

        an area (box, sphere, ellipsoid whatever subclasses choose to be).

        This is an empty superclass and needs to be subclassed. Basic particle

        emitter emits particles from/in an (unspecified) area. The

        initial direction of these particles can either be a single direction

        (i.e. a line), a random scattering inside a cone, or a random

        scattering in all directions, depending the 'angle' parameter, which

        is the angle across which to scatter the particles either side of the

        base direction of the emitter. 

    */

    class AreaEmitter : public ParticleEmitter

    {

    public:

        /** Command object for area emitter size (see ParamCommand).*/

        class CmdWidth : public ParamCommand

        {

        public:

            String doGet(const void* target) const override;

            void doSet(void* target, const String& val) override;

        };

        /** Command object for area emitter size (see ParamCommand).*/

        class CmdHeight : public ParamCommand

        {

        public:

            String doGet(const void* target) const override;

            void doSet(void* target, const String& val) override;

        };

        /** Command object for area emitter size (see ParamCommand).*/

        class CmdDepth : public ParamCommand

        {

        public:

            String doGet(const void* target) const override;

            void doSet(void* target, const String& val) override;

        };

        AreaEmitter(ParticleSystem* psys) : ParticleEmitter(psys) {}

        /** Overloaded to update the trans. matrix */

        void setDirection( const Vector3& direction ) override;

        /** Sets the size of the area from which particles are emitted.

        @param

            size Vector describing the size of the area. The area extends

            around the center point by half the x, y and z components of

            this vector. The box is aligned such that it's local Z axis points

            along it's direction (see setDirection)

        */

        void setSize(const Vector3& size);

        /** Sets the size of the area from which particles are emitted.

        @param x,y,z

            Individual axis lengths describing the size of the area. The area

            extends around the center point by half the x, y and z components

            of this vector. The box is aligned such that it's local Z axis

            points along it's direction (see setDirection)

        */

        void setSize(Real x, Real y, Real z);

        /** Sets the width (local x size) of the emitter. */

        void setWidth(Real width);

        /** Gets the width (local x size) of the emitter. */

        Real getWidth(void) const;

        /** Sets the height (local y size) of the emitter. */

        void setHeight(Real Height);

        /** Gets the height (local y size) of the emitter. */

        Real getHeight(void) const;

        /** Sets the depth (local y size) of the emitter. */

        void setDepth(Real Depth);

        /** Gets the depth (local y size) of the emitter. */

        Real getDepth(void) const;

    protected:

        /// Size of the area

        Vector3 mSize;

        /// Local axes, not normalised, their magnitude reflects area size

        Vector3 mXRange, mYRange, mZRange;

        /// Internal method for generating the area axes

        void genAreaAxes(void);

        /** Internal for initializing some defaults and parameters

        @return True if custom parameters need initialising

        */

        bool initDefaults(const String& mType);

        /// Command objects

        static CmdWidth msWidthCmd;

        static CmdHeight msHeightCmd;

        static CmdDepth msDepthCmd;

    };

    /** @} */

    /** @} */

}

#endif