#pragma once#include "cocos2d.h"
USING_NS_CC;typedef struct _EclipseConfig {  //中心点坐标
    CCPoint centerPosition;  //椭圆a长，三角斜边  float aLength;  //椭圆c长，三角底边  float cLength;
} EclipseConfig; class Eclipse:public ActionInterval
{
public:bool initWithDuration(float duration, const EclipseConfig& deltaPosition);virtual void update(float time);virtual Eclipse* clone() const override;virtual Eclipse* reverse(void) const  override;
public:static Eclipse *actionWithDuration(float t, const EclipseConfig& c); protected:EclipseConfig m_sConfig;  Point m_startPosition;  Point s_startPosition;  };

#include "Eclipse.h"static inline float tuoyuanXat( float a, float bx, float c,float t )//返回X坐标
{//参数方程return -a*cos(2*3.1415926*t)+a;
}static inline float tuoyuanYat( float a, float by, float c, float t )//返回Y坐标
{float b = sqrt(powf(a, 2) - powf(c, 2));//因为之前定义的参数是焦距c而不是短半轴b，所以需要计算出b//参数方程return b*sin(2*3.1415926*t);
}//
//TuoyuanBy
//
Eclipse* Eclipse::actionWithDuration(float t, const EclipseConfig& c)//利用之前定义的椭圆的三个参数初始化椭圆
{Eclipse *pTuoyuanBy = new Eclipse();pTuoyuanBy->initWithDuration(t, c);pTuoyuanBy->autorelease();return pTuoyuanBy;
}bool Eclipse::initWithDuration(float t, const EclipseConfig& c)
{if (CCActionInterval::initWithDuration(t)){m_sConfig = c;return true;}return false;
}
void Eclipse::update(float time)
{if (_target){CCPoint s_startPosition =m_sConfig.centerPosition;//中心点坐标float a = m_sConfig.aLength;float bx = m_sConfig.centerPosition.x;float by = m_sConfig.centerPosition.y;float c = m_sConfig.cLength;float x = tuoyuanXat(a, bx, c, time);//调用之前的坐标计算函数来计算出坐标值float y = tuoyuanYat(a, by, c, time);_target->setPosition(ccpAdd(s_startPosition, ccp(x-a, y)));//由于我们画计算出的椭圆你做值是以原点为中心的，所以需要加上我们设定的中心点坐标
    }
}Eclipse* Eclipse::clone() const
{auto a = new Eclipse();a->initWithDuration(_duration, m_sConfig);a->autorelease();return a;
}Eclipse* Eclipse::reverse() const
{auto a = new Eclipse();a->initWithDuration(_duration, m_sConfig);a->autorelease();return a;
}