GCTAResponse.cpp
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/***************************************************************************
* GCTAResponse.cpp - CTA Response class *
* ----------------------------------------------------------------------- *
* copyright (C) 2010-2018 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 GCTAResponse.cpp
* @brief CTA response class implementation
* @author Juergen Knoedlseder
*/
/* __ Includes ___________________________________________________________ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "GEvent.hpp"
#include "GSource.hpp"
#include "GObservations.hpp"
#include "GModelSpatial.hpp"
#include "GModelSpatialComposite.hpp"
#include "GCTAResponse.hpp"
#include "GCTASupport.hpp"
/* __ Method name definitions ____________________________________________ */
#define G_IRF "GCTAResponse::irf(GEvent&, GSource&, GObservation&)"
/* __ Macros _____________________________________________________________ */
/* __ Coding definitions _________________________________________________ */
/* __ Debug definitions __________________________________________________ */
/* __ Constants __________________________________________________________ */
/*==========================================================================
= =
= Constructors/destructors =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Void constructor
*
* Constructs void CTA response.
***************************************************************************/
GCTAResponse::GCTAResponse(void) : GResponse()
{
// Initialise members
init_members();
// Return
return;
}
/***********************************************************************//**
* @brief Copy constructor
*
* @param[in] rsp CTA response.
*
* Constructs CTA response by making a deep copy of an existing object.
**************************************************************************/
GCTAResponse::GCTAResponse(const GCTAResponse& rsp) : GResponse(rsp)
{
// Initialise members
init_members();
// Copy members
copy_members(rsp);
// Return
return;
}
/***********************************************************************//**
* @brief Destructor
*
* Destroys instance of CTA response object.
***************************************************************************/
GCTAResponse::~GCTAResponse(void)
{
// Free members
free_members();
// Return
return;
}
/*==========================================================================
= =
= Operators =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Assignment operator
*
* @param[in] rsp CTA response.
* @return CTA response.
*
* Assigns CTA response object to another CTA response object. The assignment
* performs a deep copy of all information, hence the original object from
* which the assignment has been performed can be destroyed after this
* operation without any loss of information.
***************************************************************************/
GCTAResponse& GCTAResponse::operator=(const GCTAResponse& rsp)
{
// Execute only if object is not identical
if (this != &rsp) {
// Copy base class members
this->GResponse::operator=(rsp);
// Free members
free_members();
// Initialise members
init_members();
// Copy members
copy_members(rsp);
} // endif: object was not identical
// Return this object
return *this;
}
/*==========================================================================
= =
= Public methods =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Return instrument response
*
* @param[in] event Event.
* @param[in] source Source.
* @param[in] obs Observation.
* @return Instrument response.
*
* Returns the instrument response for a given event, source and observation.
***************************************************************************/
double GCTAResponse::irf(const GEvent& event,
const GSource& source,
const GObservation& obs) const
{
// Initialise IRF value
double irf = 0.0;
// Set IRF value attributes
std::string name = obs.id() + "::" + source.name();
const GCTAInstDir& dir = gammalib::cta_dir(G_IRF, event);
const GEnergy& ereco = event.energy();
const GEnergy& etrue = source.energy();
// Signal if spatial model has free parameters
bool has_free_pars = source.model()->has_free_pars();
// If the spatial model component has free parameters, or the response
// cache should not be used, or the cache does not contain the requested
// IRF value then compute the IRF value for the spatial model.
if (has_free_pars ||
!m_use_irf_cache ||
!m_irf_cache.contains(name, dir, ereco, etrue, &irf)) {
// Compute IRF for spatial model
switch (source.model()->code()) {
case GMODEL_SPATIAL_POINT_SOURCE:
irf = irf_ptsrc(event, source, obs);
break;
case GMODEL_SPATIAL_RADIAL:
irf = irf_radial(event, source, obs);
break;
case GMODEL_SPATIAL_ELLIPTICAL:
irf = irf_elliptical(event, source, obs);
break;
case GMODEL_SPATIAL_DIFFUSE:
irf = irf_diffuse(event, source, obs);
break;
case GMODEL_SPATIAL_COMPOSITE:
irf = irf_composite(event, source, obs);
break;
default:
break;
}
} // endif: computed spatial model
// If the spatial model has no free parameters and the response cache
// should be used then put the IRF value in the response cache.
if (!has_free_pars && m_use_irf_cache) {
m_irf_cache.set(name, dir, ereco, etrue, irf);
}
// Return IRF value
return irf;
}
/*==========================================================================
= =
= Private methods =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Initialise class members
***************************************************************************/
void GCTAResponse::init_members(void)
{
// Initialize members
m_use_irf_cache = true; //!< Switched on by default
m_irf_cache.clear();
// Return
return;
}
/***********************************************************************//**
* @brief Copy class members
*
* @param[in] rsp Response to be copied
***************************************************************************/
void GCTAResponse::copy_members(const GCTAResponse& rsp)
{
// Copy members
m_use_irf_cache = rsp.m_use_irf_cache;
m_irf_cache = rsp.m_irf_cache;
// Return
return;
}
/***********************************************************************//**
* @brief Delete class members
***************************************************************************/
void GCTAResponse::free_members(void)
{
// Return
return;
}
/***********************************************************************//**
* @brief Return instrument response to composite source
*
* @param[in] event Observed event.
* @param[in] source Source.
* @param[in] obs Observation.
* @return Instrument response to composite source.
*
* Returns the instrument response to a specified composite source.
***************************************************************************/
double GCTAResponse::irf_composite(const GEvent& event,
const GSource& source,
const GObservation& obs) const
{
// Initialise IRF
double irf = 0.0;
// Get pointer to composite model
const GModelSpatialComposite* model =
dynamic_cast<const GModelSpatialComposite*>(source.model());
// Loop over model components
for (int i = 0; i < model->components(); ++i) {
// Get pointer to spatial component
GModelSpatial* spat = const_cast<GModelSpatial*>(model->component(i));
// Create new GSource object
GSource src(source.name(), spat, source.energy(), source.time());
// Compute irf value
irf += this->irf(event, src, obs) * model->scale(i);
}
// Divide by number of model components
double sum = model->sum_of_scales();
if (sum > 0.0) {
irf /= sum;
}
// Return IRF value
return irf;
}