source: trunk/src/STFrequencies.h@ 1556

Last change on this file since 1556 was 1375, checked in by mar637, 17 years ago

export WCS info to ASCII file, this required returng const& of STSubTables. This partly addresses Ticket #110

File size: 5.1 KB
Line 
1//
2// C++ Interface: STFrequencies
3//
4// Description:
5//
6//
7// Author: Malte Marquarding <asap@atnf.csiro.au>, (C) 2006
8//
9// Copyright: See COPYING file that comes with this distribution
10//
11//
12#ifndef ASAPSTFREQUENCIES_H
13#define ASAPSTFREQUENCIES_H
14
15#include <casa/aips.h>
16#include <casa/BasicSL/String.h>
17#include <coordinates/Coordinates/SpectralCoordinate.h>
18#include <tables/Tables/Table.h>
19#include <tables/Tables/ScalarColumn.h>
20
21#include "STSubTable.h"
22
23namespace asap {
24
25/**
26The Frequencies subtable of the Scantable
27
28@author Malte Marquarding
29@brief The frequency subtable of the Scantable
30*/
31class STFrequencies : public STSubTable {
32public:
33 STFrequencies() {;}
34 explicit STFrequencies(casa::Table tab);
35 explicit STFrequencies(const Scantable& parent);
36
37 virtual ~STFrequencies();
38
39 STFrequencies& operator=(const STFrequencies& other);
40
41 /**
42 * Add a new Entry to the Frequency subtable. This checks for duplicates.
43 * @param[in] refpix the reference pixel
44 * @param[in] refval the reference value
45 * @param[in] inc the increment
46 * @return an index into the frequency table
47 */
48 casa::uInt addEntry( casa::Double refpix, casa::Double refval,
49 casa::Double inc );
50
51 /**
52 * Retrieve the frequency values for a specific id via references
53 * @param refpix the reference pixel
54 * @param refval the reference value
55 * @param inc the increment
56 * @param id the identifier
57 */
58 void getEntry( casa::Double& refpix, casa::Double& refval,
59 casa::Double& inc, casa::uInt id );
60
61
62 bool conformant(const STFrequencies& other) const;
63
64 /**
65 * Retrieve the frequency values as a casa::SpectralCoordinate
66 * @param freqID
67 * @return casa::SpectralCoordinate
68 */
69 casa::SpectralCoordinate getSpectralCoordinate( casa::uInt freqID ) const;
70
71 casa::SpectralCoordinate getSpectralCoordinate( const casa::MDirection& md,
72 const casa::MPosition& mp,
73 const casa::MEpoch& me,
74 casa::Double restfreq,
75 casa::uInt freqID
76 ) const;
77
78 /**
79 * Return the unit of the frequency values
80 * @return casa::Unit
81 */
82 casa::Unit getUnit() const;
83 std::string getUnitString() const;
84
85 /**
86 * Return the doppler type of the values
87 * @return casa::MDoppler::Types
88 */
89 casa::MDoppler::Types getDoppler() const;
90 std::string getDopplerString() const;
91
92
93 /**
94 * Return the frame type, e.g MFrequency::TOPO
95 * @param base return the base frame or the user frame
96 * @return casa::MFrequency::Types
97 */
98 casa::MFrequency::Types getFrame(bool base=false) const;
99
100 /**
101 * Return a string representation of the frame type, e.g TOPO
102 * @param base return the base frame or the user frame
103 * @return the string representation of the frame
104 */
105 std::string getFrameString(bool base=false) const;
106
107 /**
108 * set the frequency frame from a string value
109 * @param frame a string identifier
110 */
111 void setFrame(const std::string& frame, bool base=false);
112 /**
113 * set the frequency frame from a casa::MFrequency::Types
114 * @param frame casa::MFrequency::Types
115 */
116 void setFrame(casa::MFrequency::Types frame, bool base=false);
117 void setUnit( const std::string & unit );
118 void setDoppler( const std::string & doppler );
119 /**
120 * rescale the whole table by a given factor
121 * @param factor the factor to bin or resample by
122 * @param mode the rescaling mode
123 * @li "BIN"
124 * @li "RESAMPLE"
125 */
126 void rescale(casa::Float factor, const std::string& mode);
127
128 /**
129 * get the reference frequency at a given channel for a specidif identifier
130 * @param id the identifier
131 * @param channel the channel number
132 * @return teh reference frequency
133 */
134 float getRefFreq(casa::uInt id, casa::uInt channel);
135
136 /**
137 * shift the reference pixel by an integer amount
138 * @param npix the shift in pixels
139 * @param id the coordinate id
140 */
141 void shiftRefPix(int npix, casa::uInt id);
142 /**
143 * Return this table or s specific row as a string representation
144 * @param id the identifier. If id<0 all rows are returned
145 * @return a string
146 */
147 std::string print(int id=-1, casa::Bool strip=casa::False) const;
148
149 std::vector<std::string> getInfo() const;
150 void setInfo( const std::vector<std::string>& theinfo );
151
152 const casa::String& name() const { return name_; }
153
154private:
155
156 /**
157 * setup the the column structure of the casa::table
158 */
159 void setup();
160 /**
161 * the actual binning of the SpectralCoordinate as called by rescale
162 * @param sc
163 * @param factor the bin factor
164 * @return casa::SpectralCoordinate
165 */
166 casa::SpectralCoordinate binCsys(const casa::SpectralCoordinate& sc, casa::Int factor);
167 /**
168 * the actual resampling of the SpectralCoordinate as called by rescale
169 * @param sc
170 * @param width the resacle width. Can be decimal.
171 * @return
172 */
173 casa::SpectralCoordinate resampleCsys(const casa::SpectralCoordinate& sc, casa::Float width);
174
175 static const casa::String name_;
176 casa::ScalarColumn<casa::Double> refvalCol_, refpixCol_, incrCol_;
177};
178
179}
180
181#endif
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