107 lines
2.4 KiB
C++
107 lines
2.4 KiB
C++
/*
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* Copyright 2013 Daniel Warner <contact@danrw.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef OBSERVER_H_
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#define OBSERVER_H_
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#include "CoordGeodetic.h"
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#include "Eci.h"
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namespace libsgp4
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{
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class DateTime;
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struct CoordTopocentric;
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/**
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* @brief Stores an observers location in Eci coordinates.
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*/
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class Observer
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{
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public:
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/**
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* Constructor
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* @param[in] latitude observers latitude in degrees
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* @param[in] longitude observers longitude in degrees
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* @param[in] altitude observers altitude in kilometers
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*/
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Observer(const double latitude,
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const double longitude,
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const double altitude)
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: m_geo(latitude, longitude, altitude)
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, m_eci(DateTime(), m_geo)
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{
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}
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/**
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* Constructor
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* @param[in] geo the observers position
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*/
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Observer(const CoordGeodetic &geo)
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: m_geo(geo)
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, m_eci(DateTime(), geo)
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{
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}
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/**
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* Set the observers location
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* @param[in] geo the observers position
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*/
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void SetLocation(const CoordGeodetic& geo)
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{
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m_geo = geo;
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m_eci.Update(m_eci.GetDateTime(), m_geo);
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}
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/**
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* Get the observers location
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* @returns the observers position
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*/
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CoordGeodetic GetLocation() const
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{
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return m_geo;
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}
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/**
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* Get the look angle for the observers position to the object
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* @param[in] eci the object to find the look angle to
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* @returns the lookup angle
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*/
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CoordTopocentric GetLookAngle(const Eci &eci);
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private:
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/**
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* @param[in] dt the date to update the observers position for
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*/
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void Update(const DateTime &dt)
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{
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if (m_eci != dt)
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{
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m_eci.Update(dt, m_geo);
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}
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}
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/** the observers position */
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CoordGeodetic m_geo;
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/** the observers Eci for a particular time */
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Eci m_eci;
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};
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} // namespace libsgp4
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#endif
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