zoukankan html css js c++ java
混沌数学之生物动力学混沌模型

相关代码:
// 生物动力学混沌模型
// http://wenku.baidu.com/link?url=yg_gE7LUXCg2mXRp-ZZdfRXXIkcNj8YOhvN7dKLJxzWIu6M0g33-W3y3culjalCYfNc5VQefVJEiEwi_woXP69H8W4x-bF22nIRnD2lsn53
class BiologyChaotic : public DiscreteEquation
{
public:
    BiologyChaotic()
    {
        m_StartX = 0.0f;
        m_StartY = 0.2f;

        m_ParamA = 2.45f;
        m_ParamB = 1.0f;
        m_ParamC = 1.0f;
        m_ParamD = 1.0f;
    }

    void IterateValue(float x, float y, float& outX, float& outY) const
    {
        outX = x+0.00025f;
        outY = m_ParamA*y*(1 - m_ParamB*y - m_ParamC*_y - m_ParamD*__y);
    }

    // 计算点集的Y轴与X轴坐标
    void CalculatePointsXY(void* curveVerticesPtr, unsigned int stride, unsigned int count)
    {
        _y = m_StartY*0.5f;
        __y = _y;

        char* xPtr = (char*)curveVerticesPtr;
        char* yPtr = (char*)curveVerticesPtr + sizeof(float);

        float y, x;
        float nx, ny;

        x = m_StartX;
        y = m_StartY;

        for (unsigned int i = 0; i < count; i++)
        {
            *(float*)xPtr = x;
            *(float*)yPtr = y;

            IterateValue(x, y, nx, ny);

            _y = y;
            __y = _y;

            x = nx;
            y = ny;

            xPtr += stride;
            yPtr += stride;
        }
    }

    bool IsValidParamA() const {return true;}
    bool IsValidParamB() const {return true;}
    bool IsValidParamC() const {return true;}
    bool IsValidParamD() const {return true;}

private:
    float _y;
    float __y;
};