#include <GModelSpatialEllipticalDisk.hpp>

Inheritance diagram for GModelSpatialEllipticalDisk:

Public Member Functions
	GModelSpatialEllipticalDisk (void)
	Void constructor. More...

	GModelSpatialEllipticalDisk (const GSkyDir &dir, const double &semimajor, const double &semiminor, const double &posangle, const std::string &coordsys="CEL")
	Disk constructor. More...

	GModelSpatialEllipticalDisk (const GXmlElement &xml)
	XML constructor. More...

	GModelSpatialEllipticalDisk (const GModelSpatialEllipticalDisk &model)
	Copy constructor. More...

virtual	~GModelSpatialEllipticalDisk (void)
	Destructor. More...

virtual GModelSpatialEllipticalDisk &	operator= (const GModelSpatialEllipticalDisk &model)
	Assignment operator. More...

virtual void	clear (void)
	Clear elliptical disk model. More...

virtual GModelSpatialEllipticalDisk *	clone (void) const
	Clone elliptical disk model. More...

virtual std::string	classname (void) const
	Return class name. More...

virtual double	eval (const double &theta, const double &posangle, const GEnergy &energy, const GTime &time, const bool &gradients=false) const
	Evaluate function (in units of sr^-1) More...

virtual GSkyDir	mc (const GEnergy &energy, const GTime &time, GRan &ran) const
	Returns MC sky direction. More...

virtual bool	contains (const GSkyDir &dir, const double &margin=0.0) const
	Checks where model contains specified sky direction. More...

virtual double	theta_max (void) const
	Return maximum model radius (in radians) More...

virtual void	read (const GXmlElement &xml)
	Read model from XML element. More...

virtual void	write (GXmlElement &xml) const
	Write model into XML element. More...

virtual std::string	print (const GChatter &chatter=NORMAL) const
	Print information. More...

Public Member Functions inherited from GModelSpatialElliptical
	GModelSpatialElliptical (void)
	Void constructor. More...

	GModelSpatialElliptical (const GModelSpatialElliptical &model)
	Copy constructor. More...

	GModelSpatialElliptical (const GXmlElement &xml)
	XML constructor. More...

virtual	~GModelSpatialElliptical (void)
	Destructor. More...

virtual GModelSpatialElliptical &	operator= (const GModelSpatialElliptical &model)
	Assignment operator. More...

virtual GClassCode	code (void) const
	Return class code. More...

virtual double	eval (const GPhoton &photon, const bool &gradients=false) const
	Return model value. More...

virtual double	mc_norm (const GSkyDir &dir, const double &radius) const
	Return normalization of elliptical source for Monte Carlo simulations. More...

std::string	coordsys (void) const
	Return coordinate system. More...

const GSkyDir &	dir (void) const
	Return position of elliptical spatial model. More...

void	dir (const GSkyDir &dir)
	Set position of radial spatial model. More...

double	posangle (void) const
	Return Position Angle of model. More...

void	posangle (const double &posangle)
	Set Position Angle of model. More...

double	semiminor (void) const
	Return semi-minor axis of ellipse. More...

double	semimajor (void) const
	Return semi-major axis of ellipse. More...

void	semiminor (const double &semiminor)
	Set semi-minor axis of ellipse. More...

void	semimajor (const double &semimajor)
	Set semi-major axis of ellipse. More...

Public Member Functions inherited from GModelSpatial
	GModelSpatial (void)
	Void constructor. More...

	GModelSpatial (const GModelSpatial &model)
	Copy constructor. More...

virtual	~GModelSpatial (void)
	Destructor. More...

virtual GModelSpatial &	operator= (const GModelSpatial &model)
	Assignment operator. More...

virtual GModelPar &	operator[] (const int &index)
	Returns model parameter. More...

virtual const GModelPar &	operator[] (const int &index) const
	Returns model parameter (const version) More...

virtual GModelPar &	operator[] (const std::string &name)
	Returns model parameter. More...

virtual const GModelPar &	operator[] (const std::string &name) const
	Returns model parameter (const version) More...

virtual double	flux (const GSkyRegion &region, const GEnergy &srcEng=GEnergy(), const GTime &srcTime=GTime()) const
	Returns model flux within sky region. More...

std::string	type (void) const
	Return model type. More...

void	type (const std::string &type)
	Set model type. More...

GModelPar &	at (const int &index)
	Returns model parameter. More...

const GModelPar &	at (const int &index) const
	Returns model parameter (const version) More...

bool	has_par (const std::string &name) const
	Checks if parameter name exists. More...

bool	has_free_pars (void) const
	Checks if the spatial model has free parameters. More...

int	size (void) const
	Return number of parameters. More...

void	autoscale (void)
	Autoscale parameters. More...

const GSkyRegion *	region (void) const
	Return boundary sky region. More...

Public Member Functions inherited from GBase
virtual	~GBase (void)
	Destructor. More...

Protected Member Functions
void	init_members (void)
	Initialise class members. More...

void	copy_members (const GModelSpatialEllipticalDisk &model)
	Copy class members. More...

void	free_members (void)
	Delete class members. More...

void	update (void) const
	Update precomputation cache. More...

virtual void	set_region (void) const
	Set boundary sky region. More...

Protected Member Functions inherited from GModelSpatialElliptical
void	init_members (void)
	Initialise class members. More...

void	copy_members (const GModelSpatialElliptical &model)
	Copy class members. More...

void	free_members (void)
	Delete class members. More...

bool	is_celestial (void) const
	Check if model holds celestial coordinates. More...

Protected Member Functions inherited from GModelSpatial
void	init_members (void)
	Initialise class members. More...

void	copy_members (const GModelSpatial &model)
	Copy class members. More...

void	free_members (void)
	Delete class members. More...

Protected Attributes
double	m_last_semiminor
	Last semi-minor axis. More...

double	m_last_semimajor
	Last semi-major axis. More...

double	m_semiminor_rad
	Radius in radians. More...

double	m_semimajor_rad
	Radius in radians. More...

double	m_norm
	Normalization. More...

Protected Attributes inherited from GModelSpatialElliptical
GModelPar	m_lon
	Right Ascension or Galactic longitude (deg) More...

GModelPar	m_lat
	Declination or Galactic latitude (deg) More...

GModelPar	m_posangle
	Position angle from North, counterclockwise (deg) More...

GModelPar	m_semiminor
	Semi-minor axis of ellipse (deg) More...

GModelPar	m_semimajor
	Semi-major axis of ellipse (deg) More...

GSkyDir	m_dir
	Sky direction representing parameters. More...

double	m_last_lon
	Last longitude. More...

double	m_last_lat
	Last latitude. More...

Protected Attributes inherited from GModelSpatial
std::string	m_type
	Spatial model type. More...

GSkyRegionCircle	m_region
	Bounding circle. More...

std::vector< GModelPar * >	m_pars
	Parameter pointers. More...

Detailed Description

Definition at line 54 of file GModelSpatialEllipticalDisk.hpp.

Constructor & Destructor Documentation

GModelSpatialEllipticalDisk::GModelSpatialEllipticalDisk ( void )

Void constructor.

Definition at line 67 of file GModelSpatialEllipticalDisk.cpp.

References init_members().

Referenced by clone().

GModelSpatialEllipticalDisk::GModelSpatialEllipticalDisk	(	const GSkyDir &	dir,
		const double &	semimajor,
		const double &	semiminor,
		const double &	posangle,
		const std::string &	coordsys = `"CEL"`
	)

Disk constructor.

Parameters

[in]	dir	Sky position of disk centre.
[in]	semimajor	Semi-major axis (degrees).
[in]	semiminor	Semi-minor axis (degrees).
[in]	posangle	Position angle of semi-major axis (degrees).
[in]	coordsys	Coordinate system (either "CEL" or "GAL")

Exceptions

GException::invalid_argument Invalid coordsys argument specified.

Construct elliptical disk model from sky position of the ellipse centre (dir), the semimajor and semiminor axes, and the position angle (posangle). The coordsys parameter specifies whether the sky direction should be interpreted in the celestial or Galactic coordinate system.

Definition at line 96 of file GModelSpatialEllipticalDisk.cpp.

References GModelSpatialElliptical::dir(), G_CONSTRUCTOR, init_members(), GModelSpatialElliptical::m_lat, GModelSpatialElliptical::m_lon, GOptimizerPar::name(), GModelSpatialElliptical::posangle(), GModelSpatialElliptical::semimajor(), and GModelSpatialElliptical::semiminor().

GModelSpatialEllipticalDisk::GModelSpatialEllipticalDisk ( const GXmlElement & xml )

explicit

XML constructor.

Parameters

[in] xml XML element.

Constructs elliptical disk model by extracting information from an XML element. See the read() method for more information about the expected structure of the XML element.

Definition at line 144 of file GModelSpatialEllipticalDisk.cpp.

References init_members(), and read().

GModelSpatialEllipticalDisk::GModelSpatialEllipticalDisk ( const GModelSpatialEllipticalDisk & model )

Copy constructor.

Parameters

[in] model Elliptical disk model.

Definition at line 163 of file GModelSpatialEllipticalDisk.cpp.

References copy_members(), and init_members().

GModelSpatialEllipticalDisk::~GModelSpatialEllipticalDisk ( void )

virtual

Destructor.

Definition at line 180 of file GModelSpatialEllipticalDisk.cpp.

References free_members().

Member Function Documentation

std::string GModelSpatialEllipticalDisk::classname ( void ) const

inlinevirtual

Return class name.

Returns: String containing the class name ("GModelSpatialEllipticalDisk").

Implements GModelSpatialElliptical.

Definition at line 114 of file GModelSpatialEllipticalDisk.hpp.

void GModelSpatialEllipticalDisk::clear ( void )

virtual

Clear elliptical disk model.

Implements GModelSpatialElliptical.

Definition at line 235 of file GModelSpatialEllipticalDisk.cpp.

References free_members(), GModelSpatialElliptical::free_members(), GModelSpatial::free_members(), init_members(), GModelSpatialElliptical::init_members(), and GModelSpatial::init_members().

GModelSpatialEllipticalDisk * GModelSpatialEllipticalDisk::clone ( void ) const

virtual

Clone elliptical disk model.

Returns: Pointer to deep copy of elliptical disk model.

Implements GModelSpatialElliptical.

Definition at line 257 of file GModelSpatialEllipticalDisk.cpp.

References GModelSpatialEllipticalDisk().

bool GModelSpatialEllipticalDisk::contains	(	const GSkyDir &	dir,
		const double &	margin = `0.0`
	)		const

virtual

Checks where model contains specified sky direction.

Parameters

[in]	dir	Sky direction.
[in]	margin	Margin to be added to sky direction (degrees)

Returns: True if the model contains the sky direction.

Signals whether a sky direction is contained in the elliptical disk model.

Todo:: Implement correct evaluation of effective ellipse radius.

Implements GModelSpatialElliptical.

Definition at line 426 of file GModelSpatialEllipticalDisk.cpp.

References gammalib::deg2rad, GModelSpatialElliptical::dir(), GSkyDir::dist(), and theta_max().

void GModelSpatialEllipticalDisk::copy_members ( const GModelSpatialEllipticalDisk & model )

protected

Copy class members.

Parameters

[in] model Elliptical disk model.

We do not have to push back the members on the parameter stack as this should have been done by init_members() that was called before. Otherwise we would have the radius twice on the stack.

Definition at line 614 of file GModelSpatialEllipticalDisk.cpp.

References m_last_semimajor, m_last_semiminor, m_norm, m_semimajor_rad, m_semiminor_rad, and GModelSpatial::m_type.

Referenced by GModelSpatialEllipticalDisk(), and operator=().

double GModelSpatialEllipticalDisk::eval	(	const double &	theta,
		const double &	posangle,
		const GEnergy &	energy,
		const GTime &	time,
		const bool &	gradients = `false`
	)		const

virtual

Evaluate function (in units of sr^-1)

Parameters

[in]	theta	Angular distance from disk centre (radians).
[in]	posangle	Position angle (counterclockwise from North) (radians).
[in]	energy	Photon energy.
[in]	time	Photon arrival time.
[in]	gradients	Compute gradients?

Returns: Model value.

Evaluates the spatial component for an elliptical disk source model. The disk source model is an elliptical function \(S_{\rm p}(\theta, \phi | E, t)\), where \(\theta\) is the angular separation between elliptical disk centre and the actual location and \(\phi\) the position angle with respect to the ellipse centre, counted counterclockwise from North.

The function \(f(\theta, \phi)\) is given by

\[ S_{\rm p}(\theta, \phi | E, t) = \left \{ \begin{array}{l l} {\tt m\_norm} & \mbox{if} \, \, \theta \le \theta_0 \\ \\ 0 & \mbox{else} \end{array} \right . \]

where \(\theta_0\) is the effective radius of the ellipse on the sphere given by

\[\theta_0\ = \frac{ab}{\sqrt{b^2 \cos^2(\phi-\phi_0) + a^2 \sin^2(\phi-\phi_0)}}\]

and \(a\) is the semi-major axis of the ellipse, \(b\) is the semi-minor axis, and \(\phi_0\) is the position angle of the ellipse, counted counterclockwise from North.

The normalisation constant \({\tt m\_norm}\) which is the inverse of the solid angle subtended by an ellipse is given by

The method will not compute analytical parameter gradients, even if the gradients argument is set to true. Radial disk parameter gradients need to be computed numerically.

Todo:: Quote formula for ellipse solid angle

(see the update() method).

Implements GModelSpatialElliptical.

Definition at line 317 of file GModelSpatialEllipticalDisk.cpp.

References cos(), gammalib::deg2rad, gammalib::is_infinite(), gammalib::is_notanumber(), m_norm, GModelSpatialElliptical::m_posangle, m_semimajor_rad, m_semiminor_rad, sin(), sqrt(), theta_max(), update(), and GOptimizerPar::value().

void GModelSpatialEllipticalDisk::free_members ( void )

protected

Delete class members.

Definition at line 634 of file GModelSpatialEllipticalDisk.cpp.

Referenced by clear(), operator=(), and ~GModelSpatialEllipticalDisk().

void GModelSpatialEllipticalDisk::init_members ( void )

protected

Initialise class members.

Definition at line 587 of file GModelSpatialEllipticalDisk.cpp.

References m_last_semimajor, m_last_semiminor, m_norm, m_semimajor_rad, m_semiminor_rad, and GModelSpatial::m_type.

Referenced by clear(), GModelSpatialEllipticalDisk(), and operator=().

GSkyDir GModelSpatialEllipticalDisk::mc	(	const GEnergy &	energy,
		const GTime &	time,
		GRan &	ran
	)		const

virtual

Returns MC sky direction.

Parameters

[in]	energy	Photon energy.
[in]	time	Photon arrival time.
[in,out]	ran	Random number generator.

Returns: Sky direction.

Draws an arbitrary sky position from the 2D disk distribution.

Todo:: Test function

Implements GModelSpatialElliptical.

Definition at line 377 of file GModelSpatialEllipticalDisk.cpp.

References gammalib::acos(), cos(), gammalib::deg2rad, GPhoton::dir(), GModelSpatialElliptical::dir(), GPhoton::energy(), GModelSpatialElliptical::eval(), gammalib::rad2deg, GSkyDir::rotate_deg(), GModelSpatialElliptical::semimajor(), GPhoton::time(), GRan::uniform(), and update().

GModelSpatialEllipticalDisk & GModelSpatialEllipticalDisk::operator= ( const GModelSpatialEllipticalDisk & model )

virtual

Assignment operator.

Parameters

[in] model Elliptical disk model.

Returns: Elliptical disk model.

Definition at line 202 of file GModelSpatialEllipticalDisk.cpp.

References copy_members(), free_members(), init_members(), and GModelSpatialElliptical::operator=().

std::string GModelSpatialEllipticalDisk::print ( const GChatter & chatter = NORMAL ) const

virtual

Print information.

Parameters

[in] chatter Chattiness.

Returns: String containing model information.

Implements GModelSpatialElliptical.

Definition at line 553 of file GModelSpatialEllipticalDisk.cpp.

References GModelSpatial::m_pars, gammalib::parformat(), SILENT, GModelSpatial::size(), and gammalib::str().

void GModelSpatialEllipticalDisk::read ( const GXmlElement & xml )

virtual

Read model from XML element.

Parameters

[in] xml XML element.

Exceptions

GException::model_invalid_parnum	Invalid number of model parameters found in XML element.
GException::model_invalid_parnames	Invalid model parameter names found in XML element.

Reads the elliptical disk model information from an XML element. The XML element shall have either the format

<spatialModel type="EllipticalDisk">
  <parameter name="RA"          scale="1.0" value="83.6331" min="-360" max="360" free="1"/>
  <parameter name="DEC"         scale="1.0" value="22.0145" min="-90"  max="90"  free="1"/>
  <parameter name="PA"          scale="1.0" value="45.0"    min="-360"  max="360" free="1"/>
  <parameter name="MinorRadius" scale="1.0" value="0.5"     min="0.001" max="10"  free="1"/>
  <parameter name="MajorRadius" scale="1.0" value="2.0"     min="0.001" max="10"  free="1"/>
</spatialModel>

or

<spatialModel type="EllipticalDisk">
  <parameter name="GLON"        scale="1.0" value="83.6331" min="-360" max="360" free="1"/>
  <parameter name="GLAT"        scale="1.0" value="22.0145" min="-90"  max="90"  free="1"/>
  <parameter name="PA"          scale="1.0" value="45.0"    min="-360"  max="360" free="1"/>
  <parameter name="MinorRadius" scale="1.0" value="0.5"     min="0.001" max="10"  free="1"/>
  <parameter name="MajorRadius" scale="1.0" value="2.0"     min="0.001" max="10"  free="1"/>
</spatialModel>

Todo:: Implement a test of the ellipse boundary. The axes and axes minimum should be >0.

Reimplemented from GModelSpatialElliptical.

Definition at line 488 of file GModelSpatialEllipticalDisk.cpp.

References G_READ, GModelSpatialElliptical::m_semimajor, GModelSpatialElliptical::m_semiminor, GOptimizerPar::name(), GModelSpatialElliptical::read(), GModelPar::read(), gammalib::xml_check_parnum(), and gammalib::xml_get_par().

Referenced by GModelSpatialEllipticalDisk().

void GModelSpatialEllipticalDisk::set_region ( void ) const

protectedvirtual

Set boundary sky region.

Implements GModelSpatialElliptical.

Definition at line 680 of file GModelSpatialEllipticalDisk.cpp.

References GModelSpatialElliptical::dir(), GModelSpatial::m_region, GModelSpatial::region(), GModelSpatialElliptical::semimajor(), and GModelSpatialElliptical::semiminor().

double GModelSpatialEllipticalDisk::theta_max ( void ) const

virtual

Return maximum model radius (in radians)

Returns: Returns maximum model radius.

Implements GModelSpatialElliptical.

Definition at line 442 of file GModelSpatialEllipticalDisk.cpp.

References gammalib::deg2rad, GModelSpatialElliptical::semimajor(), and GModelSpatialElliptical::semiminor().

Referenced by contains(), and eval().

void GModelSpatialEllipticalDisk::update ( void ) const

protected

Update precomputation cache.

Computes the normalization

\[ {\tt m\_norm} = \frac{1}{2 \pi (1 - \cos a) (1 - \cos b)} \]

Todo:: check this formula

Definition at line 651 of file GModelSpatialEllipticalDisk.cpp.

References cos(), gammalib::deg2rad, m_last_semimajor, m_last_semiminor, m_norm, m_semimajor_rad, m_semiminor_rad, GModelSpatialElliptical::semimajor(), GModelSpatialElliptical::semiminor(), sqrt(), and gammalib::twopi.

Referenced by eval(), and mc().

void GModelSpatialEllipticalDisk::write ( GXmlElement & xml ) const

virtual

Write model into XML element.

Parameters

[in] xml XML element into which model information is written.

Write the elliptical disk model information into an XML element. The XML element will have the format

<spatialModel type="EllipticalDisk">
  <parameter name="RA"          scale="1.0" value="83.6331" min="-360" max="360" free="1"/>
  <parameter name="DEC"         scale="1.0" value="22.0145" min="-90"  max="90"  free="1"/>
  <parameter name="PA"          scale="1.0" value="45.0"    min="-360"  max="360" free="1"/>
  <parameter name="MinorRadius" scale="1.0" value="0.5"     min="0.001" max="10"  free="1"/>
  <parameter name="MajorRadius" scale="1.0" value="2.0"     min="0.001" max="10"  free="1"/>
</spatialModel>

Reimplemented from GModelSpatialElliptical.

Definition at line 526 of file GModelSpatialEllipticalDisk.cpp.

References G_WRITE, GModelSpatialElliptical::m_semimajor, GModelSpatialElliptical::m_semiminor, GOptimizerPar::name(), GModelSpatial::type(), GModelSpatialElliptical::write(), GModelPar::write(), gammalib::xml_check_type(), and gammalib::xml_need_par().