casacore
RadialVelocityEngine.h
Go to the documentation of this file.
1//# RadialVelocityEngine.h: Engine for TaQL UDF RadialVelocity conversions
2//# Copyright (C) 2016
3//# Associated Universities, Inc. Washington DC, USA.
4//#
5//# This library is free software; you can redistribute it and/or modify it
6//# under the terms of the GNU Library General Public License as published by
7//# the Free Software Foundation; either version 2 of the License, or (at your
8//# option) any later version.
9//#
10//# This library is distributed in the hope that it will be useful, but WITHOUT
11//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
13//# License for more details.
14//#
15//# You should have received a copy of the GNU Library General Public License
16//# along with this library; if not, write to the Free Software Foundation,
17//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
18//#
19//# Correspondence concerning AIPS++ should be addressed as follows:
20//# Internet email: aips2-request@nrao.edu.
21//# Postal address: AIPS++ Project Office
22//# National Radio Astronomy Observatory
23//# 520 Edgemont Road
24//# Charlottesville, VA 22903-2475 USA
25//#
26//# $Id$
27
28#ifndef MEAS_RADIALVELOCITYENGINE_H
29#define MEAS_RADIALVELOCITYENGINE_H
30
31//# Includes
32#include <casacore/casa/aips.h>
33#include <casacore/meas/MeasUDF/MeasEngine.h>
34#include <casacore/measures/Measures/MRadialVelocity.h>
35#include <casacore/measures/Measures/MCRadialVelocity.h>
36#include <casacore/measures/Measures/MeasConvert.h>
37
38namespace casacore {
39
40 //# Forward declarations
41 class DopplerEngine;
42 class DirectionEngine;
43 class EpochEngine;
44 class PositionEngine;
45
46
47 // <summary>
48 // Engine for TaQL UDF RadialVelocity conversions
49 // </summary>
50
51 // <use visibility=export>
52
53 // <reviewed reviewer="" date="" tests="tMeas.cc">
54 // </reviewed>
55
56 // <prerequisite>
57 //# Classes you should understand before using this one.
58 // <li> EngineBase
59 // </prerequisite>
60
61 // <synopsis>
62 // RadialVelocityEngine defines Engines (user defined functions) that can be used
63 // in TaQL to convert Measures for radial velocities.
64 // In this way such derived values appear to be ordinary TaQL functions.
65 //
66 // RadialVelocity conversions require a MeasFrame containing sky direction,
67 // epoch and position on earth.
68 // In TaQL these functions can be called like:
69 // <srcblock>
70 // meas.rv ('TOPO', 1 'm/s', 'LSRK', 'CasA', date(),
71 // [1e6m,1e6m,1e6m], 'WGS84')
72 // </srcblock>
73 // which converts the radial velocity from LSRK to TOPO.
74 // <ul>
75 // <li>
76 // <src>toref</src> is a single constant string.
77 // <li>
78 // <src>pos</src> can have various value types. A single numeric array is
79 // a series of RA,DEC in J2000. If given as a set, the last argument of the
80 // set can be the reference types of the values in the set. The values can
81 // be strings (indicating planetary objects) or value pairs giving lon,lat.
82 // The default reference type is J2000.
83 // </ul>
84 // All such functions return data with type double and unit Hz.
85 //
86 // Radial velocities can be given like:
87 // [v1,v2,...], fromRef
88 // where fromRef is the reference type.
89 //
90 // A radial velocity can also be a table column which usually knows its type.
91 // It can also be an expression (e.g. RADIALVELOCITY[0,]) which also knows the type.
92 // </synopsis>
93
94 // <motivation>
95 // It makes it possible to handle measures in TaQL.
96 // </motivation>
97
98 class RadialVelocityEngine: public MeasEngine<MRadialVelocity>
99 {
100 public:
102
103 // Get the values.
105
106 // Get the radial velocities.
108
109 // Handle the argument(s) giving the input radial velocities and reference type.
110 // The radial velocity can be a column in a table.
111 // If 'proper' is True, it is tested if a proper radial velocity is given
112 // (with proper unit and/or type). If not. False is returned.
113 // If 'proper' is False, the value is always considered as radial velocity.
114 void handleRadialVelocity (std::vector<TENShPtr>& args,
115 uInt& argnr);
116
117 // Set the MeasConvert object.
119
120 // Set the possible doppler engine.
121 // It can be done only once.
123
124 // Set the possible direction engine.
125 // It can be done only once.
127
128 // Set the possible epoch engine.
129 // It can be done only once.
131
132 // Set the possible position engine.
133 // It can be done only once.
135
136 private:
137 virtual void handleValues (TableExprNode& operand,
138 const TableExprId& id,
139 Array<MRadialVelocity>& radialVelocities);
140
141 //# Data members.
142 MeasFrame itsFrame; //# frame used by converter
148 };
149
150} //end namespace
151
152#endif
Types
Types of known MRadialVelocity Warning: The order defines the order in the translation matrix FromTo...
void setConverter(MRadialVelocity::Types toType)
Set the MeasConvert object.
Array< Double > getArrayDouble(const TableExprId &id)
Get the values.
MRadialVelocity::Convert itsConverter
void handleRadialVelocity(std::vector< TENShPtr > &args, uInt &argnr)
Handle the argument(s) giving the input radial velocities and reference type.
void setDopplerEngine(DopplerEngine &engine)
Set the possible doppler engine.
void setPositionEngine(PositionEngine &engine)
Set the possible position engine.
void setEpochEngine(EpochEngine &engine)
Set the possible epoch engine.
Array< MRadialVelocity > getRadialVelocities(const TableExprId &id)
Get the radial velocities.
void setDirectionEngine(DirectionEngine &engine)
Set the possible direction engine.
virtual void handleValues(TableExprNode &operand, const TableExprId &id, Array< MRadialVelocity > &radialVelocities)
Let a derive class handle the values.
this file contains all the compiler specific defines
Definition: mainpage.dox:28
unsigned int uInt
Definition: aipstype.h:51