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cocos2d-x节点（b2Rope.h)API

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//绳索#ifndef B2_ROPE_H#define B2_ROPE_H#include <Box2D/Common/b2Math.h>class b2Draw;/// struct b2RopeDef{    b2RopeDef()    {        vertices = NULL;        count = 0;        masses = NULL;        gravity.SetZero();        damping = 0.1f;        k2 = 0.9f;        k3 = 0.1f;    }    ///    b2Vec2* vertices;    ///    int32 count;    ///    float32* masses;    ///    b2Vec2 gravity;    ///    float32 damping;    /// Stretching stiffness    //拉伸刚性    float32 k2;    /// Bending stiffness(弯曲刚性). 值在0.5以上，可以使模拟炸毁    float32 k3;};/// class b2Rope{public:    b2Rope();    ~b2Rope();    ///    void Initialize(const b2RopeDef* def);    ///    void Step(float32 timeStep, int32 iterations);    ///    int32 GetVertexCount() const    {        return m_count;    }    ///    const b2Vec2* GetVertices() const    {        return m_ps;    }    ///    void Draw(b2Draw* draw) const;    ///    void SetAngle(float32 angle);private:    void SolveC2();    void SolveC3();    int32 m_count;    b2Vec2* m_ps;    b2Vec2* m_p0s;    b2Vec2* m_vs;    float32* m_ims;    float32* m_Ls;    float32* m_as;    b2Vec2 m_gravity;    float32 m_damping;    float32 m_k2;    float32 m_k3;};#endif