CEObservation.cpp

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/***************************************************************************
 *  CEObservation.cpp: CppEphem                                            *
 * ----------------------------------------------------------------------- *
 *  Copyright © 2016-2019 JCardenzana                                      *
 * ----------------------------------------------------------------------- *
 *                                                                         *
 *  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 3 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, see <http://www.gnu.org/licenses/>.  *
 *                                                                         *
 ***************************************************************************/
 
#include <stdio.h>
 
#include "CEObservation.h"
 
 
/**********************************************************************/
CEObservation::CEObservation()
{
    init_members();
}
 
/**********************************************************************/
CEObservation::CEObservation(CEObserver* observer, CEBody* body, CEDate* date)
{
    init_members();
 
    // Set the objects
    SetObserver(observer);
    SetBody(body);
    SetDate(date);
}
 
 
/**********************************************************************/
CEObservation::CEObservation(const CEObservation& other)
{
    init_members();
    copy_members(other);
}
 
 
/**********************************************************************/
CEObservation::~CEObservation()
{
    free_members();
}
 
 
/**********************************************************************/
CEObservation& CEObservation::operator=(const CEObservation& other)
{
    if (this != &other) {
        free_members();
        init_members();
        copy_members(other);
    }
    return *this;
}
 
 
/**********************************************************************/
void CEObservation::GetAzimuthZenith_Rad(double *azimuth, double *zenith)
{
    *azimuth = GetAzimuth_Rad() ;
    *zenith  = GetZenith_Rad() ;
}
 
/**********************************************************************/
void CEObservation::GetAzimuthZenith_Deg(double *azimuth, double *zenith)
{
    GetAzimuthZenith_Rad(azimuth, zenith) ;
    *azimuth *= DR2D ;
    *zenith  *= DR2D ;
}
 
/**********************************************************************/
void CEObservation::GetApparentXYCoordinate_Rad(double *apparent_X, double *apparent_Y)
{
    *apparent_X = GetApparentXCoordinate_Rad() ;
    *apparent_Y = cached_apparentycoord_ ;
}
 
/**********************************************************************/
void CEObservation::GetApparentXYCoordinate_Deg(double *apparent_X, double *apparent_Y)
{
    GetApparentXYCoordinate_Rad(apparent_X, apparent_Y) ;
    *apparent_X *= DR2D ;
    *apparent_Y *= DR2D ;
}
 
 
/**********************************************************************/
bool CEObservation::UpdateCoordinates()
{
    if (NeedsUpdate()) {
        // Get the coordinates and date
        cached_coords_ = body_->ObservedCoords(*date_, *observer_);
        cached_date_   = *date_;
    }
    return true ;
}
 
 
/**********************************************************************/
void CEObservation::copy_members(const CEObservation& other)
{
    // Copy the pointers (this object does not own them)
    body_     = other.body_;
    date_     = other.date_;
    observer_ = other.observer_;
 
    // Copy the cached values
    cached_date_       = other.cached_date_;
    cached_coords_     = other.cached_coords_;
    cached_hour_angle_ = other.cached_hour_angle_;
    cached_apparentxcoord_ = other.cached_apparentxcoord_;
    cached_apparentycoord_ = other.cached_apparentycoord_;
}
 
 
/**********************************************************************/
void CEObservation::init_members(void)
{
    // Copy the pointers (this object does not own them)
    body_     = nullptr;
    date_     = nullptr;
    observer_ = nullptr;
 
    // Copy the cached values
    cached_date_           = 0.0;
    cached_coords_         = CESkyCoord();
 
    // Note that these are not filled at the moment
    cached_hour_angle_     = 0.0;
    cached_apparentxcoord_ = 0.0;
    cached_apparentycoord_ = 0.0;
}
 
 
/**********************************************************************/
void CEObservation::free_members(void)
{
    // This object is not responsible for its objects
}
 
 
/**********************************************************************/
bool CEObservation::NeedsUpdate(void)
{
    // Make sure the date object isnt nullptr
    if (date_ == nullptr) {
        return false ;
    }
    // Check if the date object has changed since the last time we querried it
    else if ((*date_) != cached_date_) {
        return true ;
    }
    // Otherwise we want to return false
    else {
        return false ;
    }
}