/usr/include/casacore/measures/Measures/ParAngleMachine.h is in casacore-dev 2.2.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 | //# ParAngleMachine.h: Converts a direction into parallactic angle
//# Copyright (C) 2001,2002
//# 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 MEASURES_PARANGLEMACHINE_H
#define MEASURES_PARANGLEMACHINE_H
//# Includes
#include <casacore/casa/aips.h>
#include <casacore/measures/Measures.h>
#include <casacore/measures/Measures/MCDirection.h>
#include <casacore/measures/Measures/MDirection.h>
#include <casacore/measures/Measures/MCEpoch.h>
#include <casacore/measures/Measures/MEpoch.h>
#include <casacore/casa/Quanta/Quantum.h>
#include <casacore/casa/Quanta/MVDirection.h>
#include <casacore/casa/Quanta/MVEpoch.h>
#include <casacore/casa/Arrays/Vector.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
//# Forward Declarations
class MeasFrame;
// <summary> Converts a direction into parallactic angle
// </summary>
// <use visibility=export>
// <reviewed reviewer="Mark Wieringa" date="2001/10/06" tests="tParAngleMachine.cc" demos="">
// </reviewed>
// <prerequisite>
// <li> <linkto class=MDirection>MDirection</linkto> class
// </prerequisite>
//
// <etymology>
// From Parallactic Angle and machinery
// </etymology>
//
// <synopsis>
// The construction of a ParAngleMachine class object creates a machine that
// can create parallactic angles from a series of time epochs given.
//
// The machinery needs an input
// <linkto class=MDirection>MDirection</linkto> to specify the input
// coordinates reference direction and coordinate system.
// The parallactic (<em>vertical</em>)
// angle will be calculated as the angle between the vertical in the
// local coordinate system (<em>Az, El</em>) through the given direction and
// the pole of the <em>J2000</em> coordinate system.
// <note role=tip> To calculate the parallactic angle for another
// coordinate system pole, add the <src>positionAngle</src> between the
// <em>J2000</em> system and the pole in the other coordinate system. </note>
//
// The machinery also needs a <linkto class=MeasFrame>MeasFrame</linkto>,
// with a position on Earth and
// a reference epoch. The reference time is necessary to have an epoch type.
//
// The actual calculation of the parallactic angles is done by the
// <src>operator()</src> accepting a time or a list of times in various
// formats.
//
// The machine calculates the paralaactic angle for the first time given to
// the machine. For subsequent times that are within a check interval,
// the angle is calculated assuming that only the hour angle changes within
// that interval. For moving objects the test interval is always forced
// to zero. Tests show that the machine with a zero interval is about
// 8 times faster than using brute force. Having an interval of an
// hour improves that by another factor of 4.
// <note role=tip> If the parallactic angles for a series of directions have
// to be calculated, it is best to have separate machines for each such
// <em>field</em>. </note>
// </synopsis>
//
// <example>
// <srcblock>
// </srcblock>
// </example>
//
// <motivation>
// To speed up parallactic angle calculations
// </motivation>
//
// <todo asof="2001/09/15">
// <li>
// </todo>
class ParAngleMachine {
public:
//# Constructors
// Create an empty machine. It can only be used after appropriate 'set'
// methods
ParAngleMachine();
// Construct for the specified direction
ParAngleMachine(const MDirection &in);
// Copy constructor (deep copy)
ParAngleMachine(const ParAngleMachine &other);
// Copy assignments (deep copy)
ParAngleMachine &operator=(const ParAngleMachine &other);
//# Destructor
~ParAngleMachine();
//# Operators
// Return parallactic angles (epoch in days if given as Double)
// <thrown>
// <li> AipsError if no frame or a frame without an Epoch (for type) or
// Position.
// </thrown>
// <group>
Quantum<Vector<Double> >
operator()(const Quantum<Vector<Double> > &ep) const;
Quantum<Vector<Double> > operator()(const Vector<MVEpoch> &ep) const;
Quantum<Vector<Double> > operator()(const Vector<MEpoch> &ep) const;
Quantum<Double> operator()(const Quantum<Double> &ep) const;
Quantum<Double> operator()(const MVEpoch &ep) const;
Quantum<Double> operator()(const MEpoch &ep) const;
Double operator()(const Double &ep) const;
Vector<Double> operator()(const Vector<Double> &ep) const;
// </group>
//# Member functions
// Will have a group of set methods (in direction; reference time; a frame;
// a reference time valid period
// <group>
void set(const MDirection &in);
void set(const MeasFrame &frame);
// </group>
// Set the test interval (in days) over which to use simple formula
void setInterval(const Double ttime);
private:
//# Data
// Input direction
MDirection *indir_p;
// Conversion engine
mutable MDirection::Convert *convdir_p;
// Measure frame
MeasFrame *frame_p;
// Converted zenith
mutable MVDirection zenith_p;
// Intermediate conversion result
mutable MVDirection mvdir_p;
// Time of last full solution (in days)
mutable Double lastep_p;
// Default time interval over which to do simple solution (days)
mutable Double defintvl_p;
// Time interval over which to do simple solution (days)
mutable Double intvl_p;
// Calculation cache
// <group>
mutable Double UTfactor_p;
mutable Double longoff_p;
mutable Double longdiff_p;
mutable Double slat1_p;
mutable Double clat1_p;
mutable Double slat2_p;
mutable Double clat2_p;
// </group>
//# Constructors
//# Private Member Functions
// Get position angle (Epoch is supposed to be in days if Double)
// <thrown>
// <li> AipsError if no frame or a frame without an Epoch (for type) or
// Position.
// </thrown>
// <group>
Double posAngle(const Quantum<Double> &ep) const;
Vector<Double> posAngle(const Quantum<Vector<Double> > &ep) const;
Double posAngle(const Double &ep) const;
Vector<Double> posAngle(const Vector<Double> &ep) const;
// </group>
// Initialise machinery
void init();
// Initialise conversion
void initConv() const;
// Calculate position angle
Double calcAngle(const Double ep) const;
};
} //# NAMESPACE CASACORE - END
#endif
|