//#########################################################################################
#region 构造函数
/// <summary>
/// 构造函数，缺省使用中心天体：地球(J2项系数为0)
/// </summary>
//public J2Gravity()
// : base(RoleOfForce.Principal, KindOfForce.NewtonianSpecificForce)
//{
// CentralBodiesFacet fromContext = CentralBodiesFacet.GetFromContext();
// this.m_centralBody = fromContext.Earth;
// this.m_gravitationalParameter = WorldGeodeticSystem1984.GravitationalParameter;
// this.J2ZonalHarmonicCoefficient = 0.0;
// this.m_referenceDistance = m_centralBody.Shape.SemimajorAxisLength;
//}
/// <summary>
/// 构造函数，缺省使用中心天体：地球(J2项系数为0)
/// </summary>
/// <param name="targetPoint">计算引力的瞬时点(位置、速度)</param>
//public J2Gravity(Point targetPoint)
// : this()
//{
// this.m_targetPoint = targetPoint;
//}
/// <summary>
/// 构造函数，从已有对象复制
/// </summary>
/// <param name="existingInstance">已有对象</param>
/// <param name="context">A CopyContext that controls the depth of the copy.</param>
protected J2Gravity(J2Gravity existingInstance, CopyContext context)
: base(existingInstance, context)
{
this.m_centralBody = context.UpdateReference <CentralBody>(existingInstance.m_centralBody);
this.m_gravitationalParameter = existingInstance.m_gravitationalParameter;
this.m_ignorePartials = existingInstance.m_ignorePartials;
this.m_targetPoint = context.UpdateReference <Point>(existingInstance.m_targetPoint);
this.m_j2ZonalHarmonicCoefficient = existingInstance.m_j2ZonalHarmonicCoefficient;
this.m_referenceDistance = existingInstance.m_referenceDistance;
}
//#####################################################################################
/// <summary>
/// 构造函数，从已有对象创建
/// </summary>
/// <param name="existingInstance"></param>
/// <param name="context"></param>
private J2Evaluator(J2Evaluator existingInstance, CopyContext context)
: base(existingInstance, context)
{
this.m_position = existingInstance.m_position;
this.m_gravity = existingInstance.m_gravity;
this.m_definedIn = context.UpdateReference <Axes>(existingInstance.m_definedIn);
this.UpdateEvaluatorReferences(context);
}
