Box2d 随机数生成函数

 

#define RAND_LIMIT  32767

/// Random number in range [-1,1]
inline float32 RandomFloat()
{
    float32 r = (float32)(std::rand() & (RAND_LIMIT));
    r /= RAND_LIMIT;
    r = 2.0f * r - 1.0f;
    return r;
}

/// Random floating point number in range [lo, hi]
inline float32 RandomFloat(float32 lo, float32 hi)
{
    float32 r = (float32)(std::rand() & (RAND_LIMIT));
    r /= RAND_LIMIT;
    r = (hi - lo) * r + lo;
    return r;
}