axmol/cocos2dx/physics/CCPhysicsJoint.h

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

#ifndef __CCPHYSICS_JOINT_H__
#define __CCPHYSICS_JOINT_H__

#include "cocoa/CCObject.h"
#include "cocoa/CCGeometry.h"

NS_CC_BEGIN

class PhysicsBody;
class PhysicsJointInfo;
class PhysicsBodyInfo;

/*
 * @brief An PhysicsJoint object connects two physics bodies together.
 */
class PhysicsJoint : public Object
{
protected:
    PhysicsJoint();
    virtual ~PhysicsJoint() = 0;

public:
    PhysicsBody* getBodyA() { return _bodyA; }
    PhysicsBody* getBodyB() { return _bodyB; }
    inline int getTag() { return _tag; }
    inline void setTag(int tag) { _tag = tag; }
    inline bool isEnable() { return _enable; }
    void setEnable(bool enable);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b);
    
    /**
     * PhysicsShape is PhysicsBody's friend class, but all the subclasses isn't. so this method is use for subclasses to catch the bodyInfo from PhysicsBody.
     */
    PhysicsBodyInfo* bodyInfo(PhysicsBody* body) const;
    
protected:
    PhysicsBody* _bodyA;
    PhysicsBody* _bodyB;
    PhysicsJointInfo* _info;
    bool _enable;
    int _tag;
    
    friend class PhysicsBody;
    friend class PhysicsWorld;
};

/*
 * @brief A fixed joint fuses the two bodies together at a reference point. Fixed joints are useful for creating complex shapes that can be broken apart later.
 */
class PhysicsJointFixed : public PhysicsJoint
{
public:
    PhysicsJointFixed* create(PhysicsBody* a, PhysicsBody* b, const Point& anchr);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Point& anchr);
    
protected:
    PhysicsJointFixed();
    virtual ~PhysicsJointFixed();
};

/*
 * @brief A sliding joint allows the two bodies to slide along a chosen axis.
 */
class PhysicsJointSliding : public PhysicsJoint
{
public:
    PhysicsJointSliding* create(PhysicsBody* a, PhysicsBody* b, const Point& grooveA, const Point& grooveB, const Point& anchr);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Point& grooveA, const Point& grooveB, const Point& anchr);
    
protected:
    PhysicsJointSliding();
    virtual ~PhysicsJointSliding();
};

/*
 * @brief A spring joint connects the two bodies with a spring whose length is the initial distance between the two bodies.
 */
class PhysicsJointSpring : public PhysicsJoint
{
public:
    PhysicsJointSpring* create();
    
protected:
    bool init();
    
protected:
    PhysicsJointSpring();
    virtual ~PhysicsJointSpring();
};

/*
 * @brief A limit joint imposes a maximum distance between the two bodies, as if they were connected by a rope.
 */
class PhysicsJointLimit : public PhysicsJoint
{
public:
    PhysicsJointLimit* create(PhysicsBody* a, PhysicsBody* b, const Point& anchr1, const Point& anchr2, float min, float max);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Point& anchr1, const Point& anchr2, float min, float max);
    
protected:
    PhysicsJointLimit();
    virtual ~PhysicsJointLimit();
};

/*
 * @brief A pin joint allows the two bodies to independently rotate around the anchor point as if pinned together.
 */
class PhysicsJointPin : public PhysicsJoint
{
public:
    static PhysicsJointPin* create(PhysicsBody* a, PhysicsBody* b, const Point& anchr1, const Point& anchr2);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Point& anchr1, const Point& anchr2);
    
protected:
    PhysicsJointPin();
    virtual ~PhysicsJointPin();
};

NS_CC_END

#endif // __CCPHYSICS_JOINT_H__

#endif // CC_USE_PHYSICS