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//# Copyright (C) 1998,2000
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//# $Id$
#ifndef CASA_MVUVW_H
#define CASA_MVUVW_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/casa/Quanta/MVPosition.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Forward Declarations
class MVDirection;
class MVBaseline;
// <summary> A 3D vector on Earth </summary>
// <use visibility=export>
// <reviewed reviewer="UNKNOWN" date="before2004/08/25" tests="tMuvw" demos="">
// </reviewed>
// <prerequisite>
// <li> <linkto class=MeasValue>MeasValue</linkto>
// </prerequisite>
//
// <etymology>
// From Measure, Value and uvw
// </etymology>
//
// <synopsis>
// A MVuvw is a 3-vector of uvws in a rectangular frame with
// internal units of m.<br>
// It can be constructed with:
// <ul>
// <li> MVuvw() creates point at origin (0,0,0)
// <li> MVuvw(MVuvw) creates a copy
// <li> MVuvw(Double, Double, Double) creates (x,y,z) with
// specified values (assuming meters)
// <li> MVuvw(Quantity length,Double, Double) creates a MVuvw assuming
// that the two values are (in radians) angle along 'equator'
// and towards 'pole'.
// <li> MVuvw(Quantity length, Quantity, Quantity) creates a MVuvw
// assuming angles as in previous, or uvws
// <li> <src>MVuvw(Quantity, Quantum<Vector<Double> >)</src> creates a
// MVuvw from angle vector, using first two angles, and
// assuming second as zero if not present.
// <li> <src>MVuvw(Quantum<Vector<Double> ></src> creates from
// angles or uvws, depending on the units in the
// quantum vector. In the angle case,
// the data derived can be scaled with the readjust() function. If
// the unit of the quantum vector is length, uvw is
// assumed.
// <li> <src>MVuvw(Vector<Double></src> creates from angles (less than
// or equal to two elements) or x,y,z (3 elements).
// <li> <src>MVuvw(Vector<Quantity></src> creates from length+angles,
// angles, or x,y,z, depending on units.
// <li> <src>MVuvw(MVBaseline, MVDirection)</src> creates a uvw
// in the specified reference direction (in same reference frame)
// </ul>
// A void adjust(Double) function normalises the vector to a length of 1;
// a get() returns as a
// Double 3-vector the length and angles of the uvw vector;
// a getAngle() returns a Quantum 2-vector, (uInt) returns the indicated
// element, and getValue returns the vector.<br>
// uvws can be added and subtracted.<br>
// The multiplication of two uvws produces the in-product.<br>
// </synopsis>
//
// <example>
// See <linkto class=Muvw>Muvw</linkto> class.
// </example>
//
// <motivation>
// To do coordinate transformations
// </motivation>
//
// <todo asof="1998/04/20">
// <li> Implement for EW
// <li> Get sign (especially of V) correct
// <li> Let it handle Vectors of UVW
// <li> Add some rotation matrix history for speed
// </todo>
class MVuvw : public MVPosition {
public:
//# Friends
//# Constructors
// Default constructor generates a (0,0,0) uvw
MVuvw();
// Copy constructor
MVuvw(const MVPosition &other);
// Creates a specified vector
MVuvw(Double in0, Double in1, Double in2);
// Creates a vector with specified length towards pole
// <group>
explicit MVuvw(Double in0);
MVuvw(const Quantity &l);
// </group>
// Creates the uvw from specified (azimuth,elevation) angles and length
MVuvw(const Quantity &l, Double angle0, Double angle1);
// Creates the uvw from specified angles and length. or uvws
// <thrown>
// <li> AipsError if quantities not in angle format
// </thrown>
// <group>
MVuvw(const Quantity &l, const Quantity &angle0,
const Quantity &angle1);
// If not enough angles: pole assumed (if none), or elevation =0 (if 1)
MVuvw(const Quantum<Vector<Double> > &angle);
MVuvw(const Quantity &l, const Quantum<Vector<Double> > &angle);
// </group>
// Create from specified length and/or angles and/or uvw
// <group>
MVuvw(const Vector<Double> &other);
MVuvw(const Vector<Quantity> &other);
// </group>
// uvw from a baseline and a reference direction (in same frame)
// <group>
MVuvw(const MVBaseline &pos, const MVDirection &dr, Bool ew=False);
// </group>
// Copy assignment
MVuvw &operator=(const MVuvw &other);
// Destructor
~MVuvw();
//# Operators
// Multiplication defined as in-product
// <group>
Double operator*(const MVuvw &other) const;
// </group>
// Equality comparisons
// <group>
Bool operator== (const MVuvw &other) const;
Bool operator!= (const MVuvw &other) const;
Bool near(const MVuvw &other, Double tol=1e-13) const;
Bool near(const MVuvw &other, Quantity tol) const;
Bool nearAbs(const MVuvw &other, Double tol=1e-13) const;
// </group>
// Addition and subtraction
// <group>
MVuvw operator-() const;
MVuvw &operator+=(const MVuvw &right);
MVuvw operator+(const MVuvw &right) const;
MVuvw &operator-=(const MVuvw &right);
MVuvw operator-(const MVuvw &right) const;
// </group>
//# General Member Functions
// Tell me your type
// <group>
virtual uInt type() const;
static void assure(const MeasValue &in);
// </group>
// Normalise direction aspects by adjusting the length to 1
// <group>
virtual void adjust();
virtual void adjust(Double &res);
virtual void readjust(Double res);
// </group>
// Get radius(i.e. length of vector, in m) of uvw
virtual Double radius();
// Generate a 3-vector of coordinates (length(m), angles(rad))
Vector<Double> get() const;
// Generate a 3-vector of x,y,z in m
const Vector<Double> &getValue() const;
// Generate angle 2-vector (in rad)
Quantum<Vector<Double> > getAngle() const;
// and with specified units
Quantum<Vector<Double> > getAngle(const Unit &unit) const;
// Generate the length
Quantity getLength() const;
// and generate it with the specified units
Quantity getLength(const Unit &unit) const;
// Get the uvw angle between the directions. I.e. the angle between
// the direction from one to the pole, and from one to the other.
// <group>
Double uvwAngle(const MVuvw &other) const;
Quantity uvwAngle(const MVuvw &other,
const Unit &unit) const;
// </group>
// Get the angular separation between two directions.
// <group>
Double separation(const MVuvw &other) const;
Quantity separation(const MVuvw &other,
const Unit &unit) const;
// </group>
// Produce the cross product
MVuvw crossProduct(const MVuvw &other) const;
// Print data
virtual void print(ostream &os) const;
// Clone
virtual MeasValue *clone() const;
// Get the value in internal units
virtual Vector<Double> getVector() const;
// Set the value from internal units (set 0 for empty vector)
virtual void putVector(const Vector<Double> &in);
// Get the internal value as a <src>Vector<Quantity></src>. Usable in
// records. The getXRecordValue() gets additional information for records.
// Note that the Vectors could be empty.
// <group>
virtual Vector<Quantum<Double> > getRecordValue() const;
virtual Vector<Quantum<Double> > getXRecordValue() const;
virtual Vector<Quantum<Double> > getTMRecordValue() const {
return getXRecordValue(); } ;
// </group>
// Set the internal value if correct values and dimensions
virtual Bool putValue(const Vector<Quantum<Double> > &in);
};
//# Global functions
// Rotate a uvw vector with rotation matrix and other multiplications
// <group>
MVuvw operator*(const RotMatrix &left, const MVuvw &right);
MVuvw operator*(const MVuvw &left, const RotMatrix &right);
MVuvw operator*(Double left, const MVuvw &right);
MVuvw operator*(const MVuvw &left, Double right);
Double operator*(const Vector<Double> &left, const MVuvw &right);
Double operator*(const MVuvw &left, const Vector<Double> &right);
Double operator*(const MVPosition &left, const MVuvw &right);
Double operator*(const MVuvw &left, const MVPosition &right);
// </group>
} //# NAMESPACE CASACORE - END
#endif
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