EphemerisBinary.hpp

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#pragma once
 
#include "AstGlobal.h"
#include "AstCore/Ephemeris.hpp"
#include "AstCore/TimePoint.hpp"
#include "AstCore/Frame.hpp"
#include "AstCore/Interval.hpp"
#include "AstMath/Vector.hpp"
#include <vector>
#include <string>
 
AST_NAMESPACE_BEGIN
 
class AST_CORE_API EphemerisBinary final: public Ephemeris
{
public:
    static EphemerisBinary* New();
 
    EphemerisBinary() = default;
    ~EphemerisBinary() override = default;
 
public:
    errc_t saveFrom(const Ephemeris* source, const std::string& filepath);
 
    errc_t open(const std::string& filepath);
 
public: // Ephemeris 接口
    Frame*  getFrame()                                    const override;
    errc_t  getPos(const TimePoint& tp, Vector3d& pos)    const override;
    errc_t  getPosVel(const TimePoint& tp, Vector3d& pos, Vector3d& vel) const override;
    errc_t  getInterval(TimeInterval& interval)           const override;
 
private:
    void fillWindow(size_t idx) const;
 
    int findIndex(double delta) const;
 
    static constexpr uint32_t MAGIC       = 0x41535445;   // "ASTE"
    static constexpr uint32_t VERSION     = 1;
    static constexpr size_t   WINDOW_SIZE = 256;           // 固定窗口大小
    static constexpr int      INTERP_ORDER = 5;            // Lagrange 插值阶数
 
    TimePoint           epoch_{};                 
    Interval            interval_{};              
    double              averageStep_{60.0};       
    size_t              pointCount_{0};           
    std::string         filepath_;                
    std::string         frameName_;               
    mutable SharedPtr<Frame> frame_;              
 
    // 固定窗口缓存
    static constexpr size_t HEADER_BASE = 56;    // 基础头大小 (不含变长帧名)
    static constexpr size_t POINT_BYTES = 56;    // 7 doubles per point
    mutable std::vector<double>   winTimes_;     
    mutable std::vector<Vector3d> winPos_;       
    mutable std::vector<Vector3d> winVel_;       
    mutable size_t winStart_{0};                  
};
 
AST_NAMESPACE_END