axmol/cocos/physics/CCPhysicsJoint.h

/****************************************************************************
 Copyright (c) 2013 Chukong Technologies Inc.
 
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#ifndef __CCPHYSICS_JOINT_H__
#define __CCPHYSICS_JOINT_H__

#include "base/ccConfig.h"
#if CC_USE_PHYSICS

#include "base/CCRef.h"
#include "math/CCGeometry.h"

NS_CC_BEGIN

class Node;
class PhysicsBody;
class PhysicsWorld;
class PhysicsJointInfo;
class PhysicsBodyInfo;

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

public:
    inline PhysicsBody* getBodyA() const { return _bodyA; }
    inline PhysicsBody* getBodyB() const { return _bodyB; }
    inline PhysicsWorld* getWorld() const { return _world; }
    inline int getTag() const { return _tag; }
    inline void setTag(int tag) { _tag = tag; }
    inline bool isEnabled() const { return _enable; }
    /** Enable/Disable the joint */
    void setEnable(bool enable);
    inline bool isCollisionEnabled() const { return _collisionEnable; }
    /** Enable/disable the collision between two bodies */
    void setCollisionEnable(bool enable);
    /** Remove the joint from the world */
    void removeFormWorld();
    /** Distory the joint*/
    static void destroy(PhysicsJoint* joint);
    
    /** Set the max force between two bodies */
    void setMaxForce(float force);
    /** Get the max force setting */
    float getMaxForce() const;
    
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* getBodyInfo(PhysicsBody* body) const;
    Node* getBodyNode(PhysicsBody* body) const;
    
protected:
    PhysicsBody* _bodyA;
    PhysicsBody* _bodyB;
    PhysicsWorld* _world;
    PhysicsJointInfo* _info;
    bool _enable;
    bool _collisionEnable;
    bool _destoryMark;
    int _tag;
    
    friend class PhysicsBody;
    friend class PhysicsWorld;
    friend class PhysicsDebugDraw;
};

/*
 * @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 CC_DLL PhysicsJointFixed : public PhysicsJoint
{
public:
    static PhysicsJointFixed* construct(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr);
    
protected:
    PhysicsJointFixed() {}
    virtual ~PhysicsJointFixed() {}
};

/*
 * @brief A limit joint imposes a maximum distance between the two bodies, as if they were connected by a rope.
 */
class CC_DLL PhysicsJointLimit : public PhysicsJoint
{
public:
    static PhysicsJointLimit* construct(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr1, const Vec2& anchr2);
    static PhysicsJointLimit* construct(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr1, const Vec2& anchr2, float min, float max);
    
    Vec2 getAnchr1() const;
    void setAnchr1(const Vec2& anchr1);
    Vec2 getAnchr2() const;
    void setAnchr2(const Vec2& anchr2);
    float getMin() const;
    void setMin(float min);
    float getMax() const;
    void setMax(float max);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr1, const Vec2& 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 CC_DLL PhysicsJointPin : public PhysicsJoint
{
public:
    static PhysicsJointPin* construct(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr);
    
protected:
    PhysicsJointPin() {}
    virtual ~PhysicsJointPin() {}
};

/** Set the fixed distance with two bodies */
class CC_DLL PhysicsJointDistance : public PhysicsJoint
{
public:
    static PhysicsJointDistance* construct(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr1, const Vec2& anchr2);
    
    float getDistance() const;
    void setDistance(float distance);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr1, const Vec2& anchr2);
    
protected:
    PhysicsJointDistance() {}
    virtual ~PhysicsJointDistance() {}
};

/** Connecting two physics bodies together with a spring. */
class CC_DLL PhysicsJointSpring : public PhysicsJoint
{
public:
    static PhysicsJointSpring* construct(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr1, const Vec2& anchr2, float stiffness, float damping);
    Vec2 getAnchr1() const;
    void setAnchr1(const Vec2& anchr1);
    Vec2 getAnchr2() const;
    void setAnchr2(const Vec2& anchr2);
    float getRestLength() const;
    void setRestLength(float restLength);
    float getStiffness() const;
    void setStiffness(float stiffness);
    float getDamping() const;
    void setDamping(float damping);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Vec2& anchr1, const Vec2& anchr2, float stiffness, float damping);
    
protected:
    PhysicsJointSpring() {}
    virtual ~PhysicsJointSpring() {}
};

/** Attach body a to a line, and attach body b to a dot */
class CC_DLL PhysicsJointGroove : public PhysicsJoint
{
public:
    static PhysicsJointGroove* construct(PhysicsBody* a, PhysicsBody* b, const Vec2& grooveA, const Vec2& grooveB, const Vec2& anchr2);
    
    Vec2 getGrooveA() const;
    void setGrooveA(const Vec2& grooveA);
    Vec2 getGrooveB() const;
    void setGrooveB(const Vec2& grooveB);
    Vec2 getAnchr2() const;
    void setAnchr2(const Vec2& anchr2);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, const Vec2& grooveA, const Vec2& grooveB, const Vec2& anchr);
    
protected:
    PhysicsJointGroove() {}
    virtual ~PhysicsJointGroove() {}
};

/** Likes a spring joint, but works with rotary */
class CC_DLL PhysicsJointRotarySpring : public PhysicsJoint
{
public:
    static PhysicsJointRotarySpring* construct(PhysicsBody* a, PhysicsBody* b, float stiffness, float damping);
    
    float getRestAngle() const;
    void setRestAngle(float restAngle);
    float getStiffness() const;
    void setStiffness(float stiffness);
    float getDamping() const;
    void setDamping(float damping);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, float stiffness, float damping);
    
protected:
    PhysicsJointRotarySpring() {}
    virtual ~PhysicsJointRotarySpring() {}
};

/** Likes a limit joint, but works with rotary */
class CC_DLL PhysicsJointRotaryLimit : public PhysicsJoint
{
public:
    static PhysicsJointRotaryLimit* construct(PhysicsBody* a, PhysicsBody* b, float min, float max);
    static PhysicsJointRotaryLimit* construct(PhysicsBody* a, PhysicsBody* b);
    
    float getMin() const;
    void setMin(float min);
    float getMax() const;
    void setMax(float max);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, float min, float max);
    
protected:
    PhysicsJointRotaryLimit() {}
    virtual ~PhysicsJointRotaryLimit() {}
};

/** Works like a socket wrench. */
class CC_DLL PhysicsJointRatchet : public PhysicsJoint
{
public:
    static PhysicsJointRatchet* construct(PhysicsBody* a, PhysicsBody* b, float phase, float ratchet);
    
    float getAngle() const;
    void setAngle(float angle);
    float getPhase() const;
    void setPhase(float phase);
    float getRatchet() const;
    void setRatchet(float ratchet);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, float phase, float ratchet);
    
protected:
    PhysicsJointRatchet() {}
    virtual ~PhysicsJointRatchet() {}
};

/** Keeps the angular velocity ratio of a pair of bodies constant. */
class CC_DLL PhysicsJointGear : public PhysicsJoint
{
public:
    static PhysicsJointGear* construct(PhysicsBody* a, PhysicsBody* b, float phase, float ratio);
    
    float getPhase() const;
    void setPhase(float phase);
    float getRatio() const;
    void setRatio(float ratchet);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, float phase, float ratio);
    
protected:
    PhysicsJointGear() {}
    virtual ~PhysicsJointGear() {}
};

/** Keeps the relative angular velocity of a pair of bodies constant */
class CC_DLL PhysicsJointMotor : public PhysicsJoint
{
public:
    static PhysicsJointMotor* construct(PhysicsBody* a, PhysicsBody* b, float rate);
    
    float getRate() const;
    void setRate(float rate);
    
protected:
    bool init(PhysicsBody* a, PhysicsBody* b, float rate);
    
protected:
    PhysicsJointMotor() {}
    virtual ~PhysicsJointMotor() {}
};

NS_CC_END

#endif // CC_USE_PHYSICS
#endif // __CCPHYSICS_JOINT_H__