source: code/trunk/src/modules/pickup/items/InvisiblePickup.h @ 7545

/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      Benedict Simlinger
 *   Co-authors:
 *      ...
 *
 */

/**
    @file InvisiblePickup.h
    @brief Declaration of the InvisiblePickup class.
    @ingroup PickupItems
*/

#ifndef _InvisiblePickup_H__
#define _InvisiblePickup_H__

#include "pickup/PickupPrereqs.h"

#include <string>

#include <worldentities/pawns/Pawn.h>
#include "worldentities/StaticEntity.h"
#include "pickup/Pickup.h"

namespace orxonox {

    /**
    @brief
        A pickup that makes the Pawn invisible.
        There are 2 parameters that can be chosen:
        - The <b>activation type</b> It can be chosen to be either <em>immediate</em> or <em>onUse</em>. The activation type essentially (as indicated by the name) defines when the Pawn will be invisible, either immediately after being picked up or only after the player uses it.
        - The <b>duration type</b> It can be chosen to be either <em>once</em> or <em>continuous</em>. For <em>once</em> the InvisiblePickup just makes the Pawn invisible for as long as it is used, for <em>continuous</em> the Pawn is invisible for the specified duration.
        - The <b>duration</b> Specifies how long (in seconds) the invisibility lasts.

        An examle of a XML implementation of a InvisiblePickup would be:
        @code
        <HealthPickup
            activationType = "immediate"
            durationType = "continuous"
            duration = 30.0
        />
        @endcode

    @author
        Benedict Simlinger

    @ingroup PickupItems
    */
    class _PickupExport InvisiblePickup : public Pickup
    {
        public:

            InvisiblePickup(BaseObject* creator); //!< Constructor.
            virtual ~InvisiblePickup(); //!< Destructor.
            
            virtual void XMLPort(Element& xmlelement, orxonox::XMLPort::Mode mode); //!< Method for creating a HealthPickup object through XML.
            virtual void changedUsed(void); //!< Is called when the pickup has transited from used to unused or the other way around.
            virtual void clone(OrxonoxClass*& item); //!< Creates a duplicate of the input OrxonoxClass.

            /**
            @brief Checks whether the Pawn is invisible.
            @return Returns if the Pawn is invisible.
            */
            inline bool getInvisibility(bool)
                { return this->invisible_; }
            /**
            @brief Get the time the InvisibilityPickup lasts.
            @return Returns the time in seconds the InvisibiltyPickup lasts.
            */
            inline float getDuration(void)
                { return this->duration_; }

        protected:
            void initializeIdentifier(void);

            bool setInvisible(bool invisibility); //!< Set the Pawn to be invisible or visible again.
            void setDuration(float duration); //!< Sets the time the InvisibilityPickup will last.

            void pickupTimerCallback(void); //!< Helper method. Is called by the Timer as soon as it expires.

        private:
            void initialize(void); //!< Initializes the member variables.
            Pawn* carrierToPawnHelper(void); //!< Helper to transform the PickupCarrier to a Pawn, and throw an error message if the conversion fails.

            Timer durationTimer_; //!< Timer.

            bool invisible_; //!< Helper to remember wether the Pawn is invisible.
            float duration_; //! Duration of invisibility.
    };
}

#endif // _InvisiblePickup_H__