cocos2d-x节点（b2Rope.h)API

最新推荐文章于 2024-04-24 09:45:46 发布

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#api #cocos2d #cocos2d-x #cocos2dx

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本文深入解析了Cocos2d-x框架中的绳索节点API，包括其结构、初始化、步进、获取顶点计数、顶点获取、绘制以及设置角度等功能。通过详细的代码注释和实例，帮助开发者更好地理解和使用该API。

本文来自 http://blog.youkuaiyun.com/runaying ，引用必须注明出处！

cocos2d-x节点（b2Rope.h)API

温馨提醒：为了大家能更好学习，强烈推荐大家看看本人的这篇博客 Cocos2d-X权威指南笔记

//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