FlightHistory.hxx

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/*
 * SPDX-FileName: FlightHistory.hxx
 * SPDX-FileCopyrightText: Copyright (C) 2012 James Turner - zakalawe (at) mac com
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#pragma once
 
#include <vector>
 
#include <simgear/math/SGMath.hxx>
#include <simgear/props/props.hxx>
#include <simgear/structure/subsystem_mgr.hxx>
 
typedef std::vector<SGGeod> SGGeodVec;
 
class PagedPathForHistory : public SGReferenced
{
public:
    PagedPathForHistory() : last_seen(0) {}
    virtual ~PagedPathForHistory() {}
    SGGeodVec path;
    time_t last_seen;
};
 
typedef SGSharedPtr<PagedPathForHistory> PagedPathForHistory_ptr;
 
const unsigned int SAMPLE_BUCKET_WIDTH = 1024;

class FGFlightHistory : public SGSubsystem
{
public:
    FGFlightHistory();
    virtual ~FGFlightHistory();
 
    // Subsystem API.
    void init() override;
    void reinit() override;
    void shutdown() override;
    void update(double dt) override;
 
    // Subsystem identification.
    static const char* staticSubsystemClassId() { return "history"; }
 
    PagedPathForHistory_ptr pagedPathForHistory(size_t max_entries, size_t newerThan = 0) const;
    SGGeodVec pathForHistory(double minEdgeLengthM = 50.0) const;

 
    void clear();
 
private:
    class Sample
    {
    public:
        SGGeod position;
        float heading, pitch, roll;
        size_t simTimeMSec;
    };
 

    class SampleBucket
    {
    public:
        Sample samples[SAMPLE_BUCKET_WIDTH];
    };
 
    double m_lastCaptureTime{0.0};
    double m_sampleInterval; 
    std::vector<SampleBucket*> m_buckets;

    unsigned int m_validSampleCount;
 
    SGPropertyNode_ptr m_weightOnWheels;
    SGPropertyNode_ptr m_enabled;
 
    bool m_lastWoW{false};
    size_t m_maxMemoryUseBytes{0};
 
    void allocateNewBucket();
 
    void capture();
 
    size_t currentMemoryUseBytes() const;
};