GLATPsfBase.cpp
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/***************************************************************************
* GLATPsfBase.cpp - Abstract Fermi/LAT point spread function base class *
* ----------------------------------------------------------------------- *
* copyright (C) 2012-2013 by Juergen Knoedlseder *
* ----------------------------------------------------------------------- *
* *
* 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/>. *
* *
***************************************************************************/
/**
* @file GLATPsfBase.cpp
* @brief Abstract Fermi/LAT point spread function base class implementation
* @author Juergen Knoedlseder
*/
/* __ Includes ___________________________________________________________ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "GLATPsfBase.hpp"
#include "GLATException.hpp"
#include "GTools.hpp"
#include "GFitsBinTable.hpp"
#include "GFitsTableFloatCol.hpp"
/* __ Method name definitions ____________________________________________ */
#define G_READ_SCALE "GLATPsfBase::read_scale(GFitsTable&)"
/* __ Macros _____________________________________________________________ */
/* __ Coding definitions _________________________________________________ */
/* __ Debug definitions __________________________________________________ */
/* __ Constants __________________________________________________________ */
/*==========================================================================
= =
= Constructors/destructors =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Void constructor
***************************************************************************/
GLATPsfBase::GLATPsfBase(void)
{
// Initialise class members
init_members();
// Return
return;
}
/***********************************************************************//**
* @brief Copy constructor
*
* @param[in] psf Point spread function.
***************************************************************************/
GLATPsfBase::GLATPsfBase(const GLATPsfBase& psf)
{
// Initialise class members
init_members();
// Copy members
copy_members(psf);
// Return
return;
}
/***********************************************************************//**
* @brief Destructor
***************************************************************************/
GLATPsfBase::~GLATPsfBase(void)
{
// Free members
free_members();
// Return
return;
}
/*==========================================================================
= =
= Operators =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Assignment operator
*
* @param[in] psf Point spread function.
* @return Point spread function.
***************************************************************************/
GLATPsfBase& GLATPsfBase::operator=(const GLATPsfBase& psf)
{
// Execute only if object is not identical
if (this != &psf) {
// Free members
free_members();
// Initialise private members
init_members();
// Copy members
copy_members(psf);
} // endif: object was not identical
// Return this object
return *this;
}
/*==========================================================================
= =
= Public methods =
= =
==========================================================================*/
/*==========================================================================
= =
= Private methods =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Initialise class members
***************************************************************************/
void GLATPsfBase::init_members(void)
{
// Initialise members
m_front = true;
m_rpsf_bins.clear();
m_scale_par1 = 0.0;
m_scale_par2 = 0.0;
m_scale_index = 0.0;
m_min_ctheta = 0.0;
// Return
return;
}
/***********************************************************************//**
* @brief Copy class members
*
* @param[in] psf Point spread function.
***************************************************************************/
void GLATPsfBase::copy_members(const GLATPsfBase& psf)
{
// Copy members
m_front = psf.m_front;
m_rpsf_bins = psf.m_rpsf_bins;
m_scale_par1 = psf.m_scale_par1;
m_scale_par2 = psf.m_scale_par2;
m_scale_index = psf.m_scale_index;
m_min_ctheta = psf.m_min_ctheta;
// Return
return;
}
/***********************************************************************//**
* @brief Delete class members
***************************************************************************/
void GLATPsfBase::free_members(void)
{
// Return
return;
}
/***********************************************************************//**
* @brief Read PSF scale factors from FITS table
*
* @param[in] table FITS table.
*
* Reads the PSF scale factors from column "PSFSCALE" of a FITS table.
***************************************************************************/
void GLATPsfBase::read_scale(const GFitsTable& table)
{
// Get pointer to column
const GFitsTableCol* scale = table["PSFSCALE"];
// Get scaling factors
if (front()) {
m_scale_par1 = scale->real(0,0);
m_scale_par2 = scale->real(0,1);
}
else {
m_scale_par1 = scale->real(0,2);
m_scale_par2 = scale->real(0,3);
}
m_scale_index = scale->real(0,4);
// Return
return;
}
/***********************************************************************//**
* @brief Write PSF scale factors
*
* @param[in] file FITS file.
*
* Writes the PSF scale factors in the extension "PSF_SCALING_PARAMS". This
* method appends an extension "PSF_SCALING_PARAMS" to the FITS file,
* irrespectively of whether the extension exists already or not.
* The scale facors are written into the column "PSFSCALE".
*
* @todo Check if PSF_SCALING_PARAMS exists already in FITS file
***************************************************************************/
void GLATPsfBase::write_scale(GFits& file) const
{
// Create new binary table
GFitsBinTable* hdu_scale = new GFitsBinTable;
// Set table attributes
hdu_scale->extname("PSF_SCALING_PARAMS");
// Allocate floating point vector column
GFitsTableFloatCol col_scale = GFitsTableFloatCol("PSFSCALE", 1, 5);
// Fill columns
if (front()) {
col_scale(0,0) = m_scale_par1;
col_scale(0,1) = m_scale_par2;
col_scale(0,2) = 0.0;
col_scale(0,3) = 0.0;
}
else {
col_scale(0,0) = 0.0;
col_scale(0,1) = 0.0;
col_scale(0,2) = m_scale_par1;
col_scale(0,3) = m_scale_par2;
}
col_scale(0,4) = m_scale_index;
// Append column to table
hdu_scale->append(col_scale);
// Append HDU to FITS file
file.append(*hdu_scale);
// Free binary table
delete hdu_scale;
// Return
return;
}
/***********************************************************************//**
* @brief Return scale factor for energy (in MeV)
*
* @param[in] energy Photon energy (in MeV).
***************************************************************************/
double GLATPsfBase::scale_factor(const double& energy) const
{
// Compute scale factor
double f1 = m_scale_par1 * std::pow(0.01*energy, m_scale_index);
double scale = std::sqrt(f1*f1 + m_scale_par2*m_scale_par2);
// Return scale factor
return scale;
}