casa::MVAngle Class Reference

Class to handle angle type conversions and I/O. More...

#include <MVAngle.h>

List of all members.

Classes
class	Format
	Format structure. More...
Public Types
enum	formatTypes {   ANGLE,   TIME,   CLEAN,   NO_D,   NO_DM,   DIG2,   FITS,   LOCAL,   NO_H,   NO_HM,   ANGLE_CLEAN,   ANGLE_NO_D,   ANGLE_NO_DM,   ANGLE_CLEAN_NO_D,   ANGLE_CLEAN_NO_DM,   TIME_CLEAN,   TIME_NO_H,   TIME_NO_HM,   TIME_CLEAN_NO_H,   TIME_CLEAN_NO_HM,   MOD_MASK }
	Format types. More...
Public Member Functions
	MVAngle ()
	Default constructor: generate a zero value.
	MVAngle (const MVAngle &other)
	Copy constructor.
MVAngle &	operator= (const MVAngle &other)
	Copy assignment.
	MVAngle (Double d)
	Constructor from Double.
	MVAngle (const Quantity &other)
	Constructor from Quantum : value can be an angle or time.
	~MVAngle ()
	Destructor.
	operator Double () const
	Conversion operator.
const MVAngle &	operator() ()
	Normalisation between -180 and +180 degrees (-pi and +pi)
const MVAngle &	operator() (Double norm)
	Normalisation between 2pi*norm and 2pi*norm + 2pi.
const MVAngle &	operator() (const MVAngle &norm)
	Normalisation between norm-pi and norm+pi.
const MVAngle &	binorm (Double norm)
	Normalisation between pi*norm and pi*norm + pi.
MVAngle	coAngle () const
	Make co-angle (e.g.
Double	radian () const
	Get value in given unit.
Double	degree () const
Double	circle () const
Quantity	get () const
Quantity	get (const Unit &inunit) const
String	string () const
	Output data Warning: The first function below is thread-unsafe because it uses the result of the setFormat function which changes a static class member; The other functions are thread-safe because the format is directly given;
String	string (MVAngle::formatTypes intyp, uInt inprec=0) const
String	string (uInt intyp, uInt inprec) const
String	string (uInt inprec) const
String	string (const MVAngle::Format &form) const
void	print (ostream &oss, const MVAngle::Format &form) const
void	print (ostream &oss, const MVAngle::Format &form, Bool loc) const
Static Public Member Functions
static Bool	unitString (UnitVal &uv, String &us, MUString &in)
	Check if String unit.
static Bool	read (Quantity &res, const String &in)
	Make res angle Quantity from string in angle/time-like format.
static Bool	read (Quantity &res, MUString &in)
static Bool	read (Quantity &res, const String &in, Bool chk)
static Bool	read (Quantity &res, MUString &in, Bool chk)
static Format	setFormat (MVAngle::formatTypes intyp, uInt inprec=0)
	Set default format Warning: It is thread-unsafe to print using the setFormat functions because they change a static class member; The only thred-safe way to print a time is to use the print function above;
static Format	setFormat (uInt intyp, uInt inprec)
static Format	setFormat (uInt inprec=0)
static Format	setFormat (const Format &form)
static Format	getFormat ()
	Get default format.
static MVAngle::formatTypes	giveMe (const String &in)
	Get code belonging to string.
static Double	timeZone ()
	Get time zone offset (in days)
Private Attributes
Double	val
	Value.
Static Private Attributes
static MVAngle::Format	defaultFormat
	Default format.
static MVAngle::Format	interimFormat
	Temporary format.
static Bool	interimSet
Friends
ostream &	operator<< (ostream &os, const MVAngle &meas)
	Output an angle.
istream &	operator>> (istream &is, MVAngle &meas)
	Input an angle.
ostream &	operator<< (ostream &os, const MVAngle::Format &form)
	Set a temporary format.

---

Detailed Description

Class to handle angle type conversions and I/O.

Intended use:

Public interface

Review Status

Reviewed By:

UNKNOWN

Date Reviewed:

before2004/08/25

Test programs:

tMeasure

Prerequisite

• Quantum

Etymology

From Measure, Value and Angle

Synopsis

An MVAngle is a simple Double, to be used for angle conversions and I/O. It can be constructed from a Double (in which case radians are assumed), or from a Quantity (Quantum<Double>). Quantities must be in either angle or time units.
It has an automatic conversion to Double, so all standard mathematical operations can operate on it.
The class has a number of special member operations:

• MVAngle operator() will normalise the angle between -180 and +180(inclusive) degrees and return the value
• MVAngle operator(Double) will normalise the angle using the value specified (and return the value) in fractions of a circle (this was chosen rather than radians to make for easier and more precise programming) as a lower bound. I.e. (-0.5) will normalise between -180 and +180 degrees, (0.) between 0 and 360 degrees, (-0.25) between -90 and +270 degrees, (5.) between 1800 and 2160 dgrees.
• MVAngle operator(MVAngle) will normalise (and return the normalised value) to within 180 degrees of the argument value. This is useful for making a range of angles contiguous.
• MVAngle binorm(Double) will normalise the angle in steps of 180 degrees. using the value specified (and return the value) in fractions of 180 degrees (this was chosen rather than radians to make for easier and more precise programming) as a lower bound. I.e. (-0.5) will normalise between -90 and +90 degrees, (0.) between 0 and 180 degrees, (10.) between 1800 and 1980 dgrees.
• Double radian() will return value in radians
• Double degree() will return value in degrees
• Double circle() will return value in fraction of circles
• MVAngle coAngle() will return 90-angle (or rather pi/2 - angle), with (0) normalisation.
• Quantity get() will return radians
• Quantity get(Unit) will return in specified units (angle or time)

Output formatting is done with the << statement, with the following rules:

• standard output is done in the following format: +ddd.mm.ss.tt with a floating sign. The number of digits presented will be based on the precision attached to the current stream
• output can be formatted by using either the setFormat() method for global angle format setting, or the output of MVAngle::Format() data for a once off change (see later). Formats have a first argument which determines the type (default, if not given, MVAngle::ANGLE, other possibility MVAngle::TIME (as hh:mm:ss.tt..), the second the number of digits wanted (default stream precision), with a value:
  • <3 : ddd.. only
  • <5 : ddd.mm.
  • <7 : ddd.mm.ss
  • >6 : with precision-6 t's added
  comparable for time;
  Tip: The added periods are to enable input checking of the format; Look at the 'clean' types to bypass them;
  The output format can be modified with modifiers (specify as MVAngle::ANGLE | MVAngle::MOD (or + MVAngle::MOD)).
  Caution: For overloading/casting problems with some compilers, the use of modifiers necessitates either the presence of a precision (i;e; (A|B, prec)), or an explicit cast: ((MVAngle::formatTypes)(A|B)), or make use of the provided ANGLE[CLEAN][_NO_D[M]] and TIME[_CLEAN][_NO_H[M]];
  The modifiers can be:
  • MVAngle::CLEAN to suppress leading or trailing periods (or colons for TIME). + and leading zeroes in degree field for angle representation will be replaced with a space. Note that he result can not be read automatically.
  • MVAngle::NO_D (or NO_H) to suppress the output of degrees (or hours): useful for offsets
  • MVAngle::NO_DM (or NO_HM), to suppress the degrees and minutes.
  • MVAngle::DIG2 to allow only 2 digits for degrees, or -12 - +12 range for hours
  • MVAngle::LOCAL to indicate local time to FITS formatting only
  • MVAngle::FITS to produce, if LOCAL set, the time zone (note that if local set here, as opposed to in MVTime) the angle is supposed to be in local time already).
  Output in formats like 20' can be done via the standard Quantum output (e.g. stream << angle.get("'") ).
• Available formats:
  • MVAngle::ANGLE in +ddd.mm.ss.ttt format
  • MVAngle::TIME in hh:mm:ss.ttt format
  • MVAngle::[ANGLE|TIME]_CLEAN format without superfluous periods
  • MVAngle::[ANGLE|TIME][_CLEAN]_NO[D|H][M] in format with leading zero fields left empty.
  • MVAngle::CLEAN modifier for suppressing superfluous periods
  • MVAngle::NO_[D|H][M] modifier to suppress first field(s)
  • MVAngle::DIG2 modifier to output in +dd.mm.ss.ttt format or in time format in range -12 to +12h

The default formatting can be overwritten by a MVAngle::setFormat(); statement; which returns an MVAngle::Format structure, that can be used in a subsequent one to reset to previous. The format set holds for all MVAngle output on all streams.
Temporary formats (i.e. for one MVAngle output only), can be set by outputting a format (i.e. stream << MVAngle::Format() << ... ).
Caution: A setFormat() will also reset any lingering temporary format; A setFormat(getFormat()) will reset without changing; Problems could arise in parallel processors;
Input can be read if the values are in any of the above (non-clean) output formats.
For other formatting practice, the output can be written to a String with the string() member function.
Note that using a temporary format is inherently thread-unsafe because the format is kept in a static variable. Another thread may overwrite the format just set. The only thread-safe way to format an MVTime is using a print or string that accepts a Format object.

Strings and input can be converted to an MVAngle (or Quantity) by Bool read(Quantity &out, const String &in) and istream >> MVAngle &. In the latter case the actual reading is done by the String read, which reads between white-spaces.
The following input formats (note no blanks allowed) are supported (+stands for an optional + or -; v for an unsigned integer; dv for a floating number. [] indicate optional values. Separating codes are case insensitive):

• +[v].[v].[dv] -- value in deg, arcmin, arcsec
• +[v]D[v[M[dv]]] -- value in deg, arcmin, arcsec
• +[v]:[v[:[dv]]] -- value in h, min, s
• +[v]H[v[M[dv]]] -- value in h, min, s
• +[v]{D|H|:}[dv] -- value in deg (or h), arcmin (or min)
• +dv[unit string] -- value in time or angle units. rad default

Examples of valid strings:

        5::2.59         5h + 0min + 2.59 s
        5..2.59         5deg + 0arcmin + 2.59arcsec
        5.259           5.259 rad
        5..259          5deg + 259arcsec
        5.259a          5.259 * pi * 2 *365.25 rad (normalised)

Caution: In general the input will be read as a Quantity; Reading of Quantities will always try to read special formats (like MVAngle, MVTime) first; In that case problems could arise converting strings like 5d, 5::, 5hm, 5dm; In 'angle' mode they could have meant to be 5d0m, 5:0:, 5h0m, 5d0m, but they could have meant: days, min, hectometre, decimetre; In the same vain 5d2 could have meant 5d2m or 5 d²; To try to guess the general use, the following interpretation is made:

• 5d, 5:: == 5deg, 5h0m; make float (like 5;d) to make it days/min
• 5dm, 5hm == decimetre, hectometre; use 5d0m 5h0m for angle
• 5d2, 5h2, 5:2 == 5d2m, 5h2m, 5:2:; use float 5 or explicit () for other interpretation




Example

See synopsis

Motivation

To be able to format angle-like values in user-required ways.

To Do

• Use AipsrcData once moved to aips from trial

Definition at line 243 of file MVAngle.h.

---

Member Enumeration Documentation

enum casa::MVAngle::formatTypes

Format types.

Enumerator:

ANGLE
TIME
CLEAN
NO_D
NO_DM
DIG2
FITS
LOCAL
NO_H
NO_HM
ANGLE_CLEAN
ANGLE_NO_D
ANGLE_NO_DM
ANGLE_CLEAN_NO_D
ANGLE_CLEAN_NO_DM
TIME_CLEAN
TIME_NO_H
TIME_NO_HM
TIME_CLEAN_NO_H
TIME_CLEAN_NO_HM
MOD_MASK

Definition at line 249 of file MVAngle.h.

---

Constructor & Destructor Documentation

casa::MVAngle::MVAngle

(

)

Default constructor: generate a zero value.

casa::MVAngle::MVAngle

(

const MVAngle &

other

)

Copy constructor.

casa::MVAngle::MVAngle

(

Double

d

)

Constructor from Double.

casa::MVAngle::MVAngle

(

const Quantity &

other

)

Constructor from Quantum : value can be an angle or time.

Thrown Exceptions

• AipsError if not a time or angle

casa::MVAngle::~MVAngle

(

)

Destructor.

---

Member Function Documentation

const MVAngle& casa::MVAngle::binorm

(

Double

norm

)

Normalisation between pi*norm and pi*norm + pi.

Double casa::MVAngle::circle

(

)

const

MVAngle casa::MVAngle::coAngle

(

)

const

Make co-angle (e.g.

zenith distance from elevation)

Double casa::MVAngle::degree

(

)

const

Quantity casa::MVAngle::get

(

)

const

Quantity casa::MVAngle::get

(

const Unit &

inunit

)

const

static Format casa::MVAngle::getFormat

(

)

[static]

Get default format.

static MVAngle::formatTypes casa::MVAngle::giveMe

(

const String &

in

)

[static]

Get code belonging to string.

0 if not known

casa::MVAngle::operator Double

(

)

const

Conversion operator.

const MVAngle& casa::MVAngle::operator()

(

)

Normalisation between -180 and +180 degrees (-pi and +pi)

const MVAngle& casa::MVAngle::operator()

(

Double

norm

)

Normalisation between 2pi*norm and 2pi*norm + 2pi.

const MVAngle& casa::MVAngle::operator()

(

const MVAngle &

norm

)

Normalisation between norm-pi and norm+pi.

MVAngle& casa::MVAngle::operator=

(

const MVAngle &

other

)

Copy assignment.

void casa::MVAngle::print	(	ostream &	oss,
		const MVAngle::Format &	form
	)		const

void casa::MVAngle::print	(	ostream &	oss,
		const MVAngle::Format &	form,
		Bool	loc
	)		const

Double casa::MVAngle::radian

(

)

const

Get value in given unit.

static Bool casa::MVAngle::read	(	Quantity &	res,
		const String &	in
	)		[static]

Make res angle Quantity from string in angle/time-like format.

In the case of String input, also quantities are recognised. chk checks eos

static Bool casa::MVAngle::read	(	Quantity &	res,
		MUString &	in
	)		[static]

static Bool casa::MVAngle::read	(	Quantity &	res,
		const String &	in,
		Bool	chk
	)		[static]

static Bool casa::MVAngle::read	(	Quantity &	res,
		MUString &	in,
		Bool	chk
	)		[static]

static Format casa::MVAngle::setFormat	(	MVAngle::formatTypes	intyp,
		uInt	inprec = 0
	)		[static]

Set default format
Warning: It is thread-unsafe to print using the setFormat functions because they change a static class member; The only thred-safe way to print a time is to use the print function above;

static Format casa::MVAngle::setFormat	(	uInt	intyp,
		uInt	inprec
	)		[static]

static Format casa::MVAngle::setFormat

(

uInt

inprec = 0

)

[static]

static Format casa::MVAngle::setFormat

(

const Format &

form

)

[static]

String casa::MVAngle::string

(

)

const

Output data
Warning: The first function below is thread-unsafe because it uses the result of the setFormat function which changes a static class member; The other functions are thread-safe because the format is directly given;

String casa::MVAngle::string	(	MVAngle::formatTypes	intyp,
		uInt	inprec = 0
	)		const

String casa::MVAngle::string	(	uInt	intyp,
		uInt	inprec
	)		const

String casa::MVAngle::string

(

uInt

inprec

)

const

String casa::MVAngle::string

(

const MVAngle::Format &

form

)

const

static Double casa::MVAngle::timeZone

(

)

[static]

Get time zone offset (in days)

static Bool casa::MVAngle::unitString	(	UnitVal &	uv,
		String &	us,
		MUString &	in
	)		[static]

Check if String unit.

---

Friends And Related Function Documentation

ostream& operator<<	(	ostream &	os,
		const MVAngle &	meas
	)		[friend]

Output an angle.

ostream& operator<<	(	ostream &	os,
		const MVAngle::Format &	form
	)		[friend]

Set a temporary format.

istream& operator>>	(	istream &	is,
		MVAngle &	meas
	)		[friend]

Input an angle.

---

Member Data Documentation

MVAngle::Format casa::MVAngle::defaultFormat [static, private]

Default format.

Definition at line 391 of file MVAngle.h.

MVAngle::Format casa::MVAngle::interimFormat [static, private]

Temporary format.

Definition at line 394 of file MVAngle.h.

Bool casa::MVAngle::interimSet [static, private]

Definition at line 395 of file MVAngle.h.

Double casa::MVAngle::val [private]

Value.

Definition at line 389 of file MVAngle.h.

---

The documentation for this class was generated from the following file:

• casacore/casa/Quanta/MVAngle.h