cocos2d-x/cocos/physics/CCPhysicsWorld.h

/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
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#include "CCPhysicsSetting.h"
#ifdef CC_USE_PHYSICS

#ifndef __CCPHYSICS_WORLD_H__
#define __CCPHYSICS_WORLD_H__

#include <list>

#include "CCObject.h"
#include "CCGeometry.h"

NS_CC_BEGIN

class PhysicsBody;
class PhysicsJoint;
class PhysicsWorldInfo;
class PhysicsShape;
class PhysicsContact;
class PhysicsContactListener;
class Array;

class Sprite;
class Scene;
class DrawNode;

class PhysicsWorld;
class PhysicsRayCastCallback
{
public:
    PhysicsRayCastCallback()
    : report(nullptr)
    {}
    virtual ~PhysicsRayCastCallback(){}
	/**
     * @brief Called for each fixture found in the query. You control how the ray cast
	 * proceeds by returning a float:
	 * return true: continue
	 * return false: terminate the ray cast
	 * @param fixture the fixture hit by the ray
	 * @param point the point of initial intersection
	 * @param normal the normal vector at the point of intersection
	 * @return true to continue, false to terminate
     */
    std::function<bool(PhysicsWorld&, PhysicsShape&, Point, Point, float, void*)> report;
};

class PhysicsRectQueryCallback
{
public:
    PhysicsRectQueryCallback()
    : report(nullptr)
    {}
    virtual ~PhysicsRectQueryCallback(){}
    
public:
    std::function<bool(PhysicsWorld&, PhysicsShape&, void*)> report;
};

/**
 * @brief An PhysicsWorld object simulates collisions and other physical properties. You do not create PhysicsWorld objects directly; instead, you can get it from an Scene object.
 */
class PhysicsWorld
{
public:
    /** Adds a joint to the physics world.*/
    void addJoint(PhysicsJoint* joint);
    /** Removes a joint from the physics world.*/
    void removeJoint(PhysicsJoint* joint);
    /** Remove all joints from the physics world.*/
    void removeAllJoints();
    
    void rayCast(PhysicsRayCastCallback& callback, Point point1, Point point2, void* data);
    void rectQuery(PhysicsRectQueryCallback& callback, Rect rect, void* data);
    Array* getShapesAtPoint(Point point);
    PhysicsShape* getShapeAtPoint(Point point);
    Array* getAllBodies() const;
    PhysicsBody* getBodyByTag(int tag);
    
    /** Register a listener to receive contact callbacks*/
    inline void registerContactListener(PhysicsContactListener* delegate) { _listener = delegate; }
    /** Unregister a listener. */
    inline void unregisterContactListener() { _listener = nullptr; }
    
    /** get the gravity value */
    inline Point getGravity() { return _gravity; }
    /** set the gravity value */
    void setGravity(Point gravity);
    
    /** test the debug draw is enabled */
    inline bool isDebugDraw() { return _debugDraw; }
    /** set the debug draw */
    inline void setDebugDraw(bool debugDraw) { _debugDraw = debugDraw; }
    
    virtual void removeBody(PhysicsBody* body);
    virtual void removeBodyByTag(int tag);
    virtual void removeAllBodies();
    
protected:
    static PhysicsWorld* create();
    bool init();
    
    void setScene(Scene* scene);
    
    virtual PhysicsBody* addBody(PhysicsBody* body);
    virtual PhysicsShape* addShape(PhysicsShape* shape);
    virtual void removeShape(PhysicsShape* shape);
    virtual void update(float delta);
    
    virtual void debugDraw();
    virtual void drawWithShape(DrawNode* node, PhysicsShape* shape);
    virtual void drawWithJoint(DrawNode* node, PhysicsJoint* joint);
    
    
    virtual int collisionBeginCallback(PhysicsContact& contact);
    virtual int collisionPreSolveCallback(PhysicsContact& contact);
    virtual void collisionPostSolveCallback(PhysicsContact& contact);
    virtual void collisionSeparateCallback(PhysicsContact& contact);
    
protected:
    Point _gravity;
    float _speed;
    PhysicsWorldInfo* _info;
    PhysicsContactListener* _listener;
    
    
    Array* _bodies;
    std::list<PhysicsJoint*> _joints;
    Scene* _scene;
    
    bool _debugDraw;
    DrawNode* _drawNode;
    
protected:
    PhysicsWorld();
    virtual ~PhysicsWorld();
    
    friend class Sprite;
    friend class Scene;
    friend class PhysicsBody;
    friend class PhysicsShape;
    friend class PhysicsWorldCallback;
};

NS_CC_END

#endif // __CCPHYSICS_WORLD_H__

#endif // CC_USE_PHYSICS