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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,97 @@ | ||
| /* | ||
| * Copyright (C) 2023 Andy Kirkham | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version 2 | ||
| * of the License, or (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA. | ||
| */ | ||
|
|
||
| #include <QChar> | ||
| #include <QDate> | ||
| #include <QDebug> | ||
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|
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| #include "OMMDateTime.hpp" | ||
|
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| OMMDateTime::OMMDateTime() | ||
| {} | ||
|
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| OMMDateTime::~OMMDateTime() | ||
| {} | ||
|
|
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| OMMDateTime::OMMDateTime(QString & s, Type t) | ||
| { | ||
| switch(t) { | ||
| case STR_TLE: | ||
| ctorTle(s); | ||
| break; | ||
| case STR_ISO8601: | ||
| ctorISO(s); | ||
| break; | ||
| default: | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| // From SGP4.cpp | ||
| static void jday_SGP4(int year, int mon, int day, int hr, int minute, double sec, double & jd, double & jdFrac) | ||
| { | ||
| jd = 367.0 * year - floor((7 * (year + floor((mon + 9) / 12.0))) * 0.25) + floor(275 * mon / 9.0) + day + | ||
| 1721013.5; // use - 678987.0 to go to mjd directly | ||
| jdFrac = (sec + minute * 60.0 + hr * 3600.0) / 86400.0; | ||
| if (fabs(jdFrac) > 1.0) { | ||
| double dtt = floor(jdFrac); | ||
| jd = jd + dtt; | ||
| jdFrac = jdFrac - dtt; | ||
| } | ||
| } | ||
|
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| void OMMDateTime::ctorTle(const QString & s) | ||
| { | ||
| int year = s.mid(0, 2).toInt(); | ||
| double day = s.mid(2).toDouble(); | ||
| int whole_day = std::floor(day); | ||
| double frac_day = day - whole_day; | ||
|
|
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| // Create a QDate. | ||
| year += (year < 57) ? 2000 : 1900; | ||
| QDate d(year, 1, 1); | ||
| d = d.addDays(whole_day - 1); // Minus 1 because we start on 1st Jan. | ||
|
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| // Create the time. | ||
| double seconds = (24 * 60 * 60) * frac_day; | ||
| int whole_hours = std::floor(seconds / 3600); | ||
| seconds -= whole_hours * 3600; | ||
| int whole_mins = std::floor(seconds / 60); | ||
| seconds -= whole_mins * 60; | ||
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| jday_SGP4(d.year(), d.month(), d.day(), whole_hours, whole_mins, seconds, m_epoch_jd, m_epoch_jd_frac); | ||
| } | ||
|
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| void OMMDateTime::ctorISO(const QString & s) | ||
| { | ||
| QDateTime d = QDateTime::fromString(s, Qt::ISODate); | ||
| int year = d.date().year(); | ||
| int mon = d.date().month(); | ||
| int day = d.date().day(); | ||
| int hour = d.time().hour(); | ||
| int min = d.time().minute(); | ||
| double sec = d.time().second(); | ||
| auto decimal = s.indexOf(QChar('.')); | ||
| if(decimal > 0) { | ||
| auto frac_s = s.mid(decimal); | ||
| double frac_d = frac_s.toDouble(); | ||
| sec += frac_d; | ||
| } | ||
| jday_SGP4(year, mon, day, hour, min, sec, m_epoch_jd, m_epoch_jd_frac); | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| /* | ||
| * Stellarium | ||
| * Copyright (C) 2023 Andy Kirkham | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version 2 | ||
| * of the License, or (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA. | ||
| */ | ||
|
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||
| /* | ||
| * The standard QDateTime type only stores to the millisecond but | ||
| * satellite propargation models use to microsecond timimg. | ||
| * For Stellarium display purposes millisecond accuracy is | ||
| * probably good enough. However, the Unit Tests source data | ||
| * expectations from common SGP4 models and therefore fail to | ||
| * agree to routines that do not account for microsecond timing. | ||
| * This class therefore is to allow for us timings. | ||
| * | ||
| * Epoch times are stored as JD and JDF. | ||
| */ | ||
|
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| #ifndef SATELLITES_OMMDATETIME_HPP | ||
| #define SATELLITES_OMMDATETIME_HPP | ||
|
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| #include <QString> | ||
| #include <QDateTime> | ||
|
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| class OMMDateTime | ||
| { | ||
| public: | ||
| enum Type { | ||
| STR_TLE, | ||
| STR_ISO8601 | ||
| }; | ||
|
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| OMMDateTime(); | ||
| ~OMMDateTime(); | ||
|
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| OMMDateTime(QString& s, Type t = STR_TLE); | ||
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| double getJulianDay() { return m_epoch_jd; } | ||
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| double getJulianFrac() { return m_epoch_jd_frac; } | ||
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| double getJulian() { return m_epoch_jd + m_epoch_jd_frac; } | ||
|
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| private: | ||
| void ctorTle(const QString & s); | ||
| void ctorISO(const QString & s); | ||
|
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| double m_epoch_jd{}; | ||
| double m_epoch_jd_frac{}; | ||
| }; | ||
|
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||
| #endif |
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