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#ifndef PHYSICS_WORLD_HH

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#define PHYSICS_WORLD_HH

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#include <ClanLib/display.h>

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#include <ClanLib/core.h>

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#include <algorithm>

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#include <functional>

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#include <cmath>

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#include "Terrain.hh"          

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class PhysicsWorld;

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#include "PhysicsObject.hh"

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#include "Vector.hh"

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#include "Timer.hh"

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#include "Config.hh"

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/**

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* PhysicsWorld class. PhysicsWorld contains PhysicsObjects that are

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* simulated in the PhysicsWorld.

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*/

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class PhysicsWorld : public Terrain {

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    friend class PhysicsObject;

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private:

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protected:

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    std::list<PhysicsObject*> objects;

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    // Contains connections between signals and slots

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    CL_SlotContainer slots;

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    Vector dimensions;

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    Vector gravity;

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public:

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    // Someone is going to kill me for this

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    Timer tick_timer;

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    PhysicsWorld(Vector gravity, Vector dimensions);

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    /**

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     * Add object to the PhysicsWorld.

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     *

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     * @param object Pointer to the PhysicsObject to add.

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     */

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    void addPhysicsObject(PhysicsObject *object);

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    /**

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     * Remove the object from the PhysicsWorld.

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     */

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    void removePhysicsObject (PhysicsObject *po);

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    /**

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     * Advance one time step in physics simulation.

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     */

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    void tick (TimeMS tick_length);

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    /**

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     * Get current tick in physics simulation.

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     *

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     * @return tick Current simulation tick.

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     */

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    TickCount getTicks (void);

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};

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#endif