Line data Source code
1 : //# tSubImage.cc: Test program for class SubImage
2 : //# Copyright (C) 1998,1999,2000,2001,2003
3 : //# Associated Universities, Inc. Washington DC, USA.
4 : //#
5 : //# This program is free software; you can redistribute it and/or modify it
6 : //# under the terms of the GNU General Public License as published by the Free
7 : //# Software Foundation; either version 2 of the License, or (at your option)
8 : //# any later version.
9 : //#
10 : //# This program 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 General Public License for
13 : //# more details.
14 : //#
15 : //# You should have received a copy of the GNU General Public License along
16 : //# with this program; if not, write to the Free Software Foundation, Inc.,
17 : //# 675 Massachusetts Ave, Cambridge, MA 02139, USA.
18 : //#
19 : //# Correspondence concerning AIPS++ should be addressed as follows:
20 : //# Internet email: casa-feedback@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: tSubImage.cc 20567 2009-04-09 23:12:39Z gervandiepen $
27 :
28 : #ifndef IMAGES_PVGENERATOR_H
29 : #define IMAGES_PVGENERATOR_H
30 :
31 : #include <imageanalysis/ImageAnalysis/ImageTask.h>
32 : #include <casacore/casa/namespace.h>
33 :
34 :
35 : namespace casacore{
36 :
37 : class MDirection;
38 : }
39 :
40 : namespace casa {
41 :
42 : class PVGenerator : public ImageTask<casacore::Float> {
43 : // <summary>
44 : // Top level interface for generating position-velocity images
45 : // </summary>
46 :
47 : // <reviewed reviewer="" date="" tests="" demos="">
48 : // </reviewed>
49 :
50 : // <prerequisite>
51 : // </prerequisite>
52 :
53 : // <etymology>
54 : // Collapses image.
55 : // </etymology>
56 :
57 : // <synopsis>
58 : // High level interface for generating position-velocity images.
59 : // </synopsis>
60 :
61 : // <example>
62 : // <srcblock>
63 : // ImageCollapser collapser();
64 : // collapser.collapse();
65 : // </srcblock>
66 : // </example>
67 :
68 : public:
69 :
70 : PVGenerator() = delete;
71 :
72 : // The region selection in the constructor only applies to the non-direction coordinates.
73 : // The direction coordinate limits are effectively set by calling setEndPoints()
74 : // after construction. The region selection in the constructor is only for things like
75 : // spectral selection and polarization selection. In addition at most one of <src>regionRec</src>
76 : // and <src>chanInp/stokes</src> should be supplied. If specifying <src>regionRec</src> that should
77 : // be a non-null pointer and chanInp and stokes should both be empty strings. If specifying either or
78 : // both of chanInp and/or stokes, the one(s) being specified should be non-empty strings corresponding
79 : // to correct syntax for that particular parameter, and regionRec should be null.
80 : // If you specify <src>regionRec</src>=0
81 : // and <src>stokes</src>="", and <src>chanInp</src>="", that implies you want to use all
82 : // spectral channels and all polarization planes in the input image.
83 : PVGenerator(
84 : const SPCIIF image,
85 : const casacore::Record *const ®ionRec, const casacore::String& chanInp,
86 : const casacore::String& stokes, const casacore::String& maskInp,
87 : const casacore::String& outname, const casacore::Bool overwrite
88 : );
89 :
90 : PVGenerator(const PVGenerator&) = delete;
91 :
92 : // destructor
93 : ~PVGenerator();
94 :
95 : // perform the collapse. Returns a pointer to the
96 : // collapsed image.
97 : SPIIF generate() const;
98 :
99 : // set the end points of the slice in direction space. casacore::Input values represent pixel
100 : // coordinates in the input image.
101 : void setEndpoints(
102 : const std::pair<casacore::Double, casacore::Double>& start,
103 : const std::pair<casacore::Double, casacore::Double>& end
104 : );
105 :
106 : // set end points given center in pixels, length of segment in pixels, and position angle
107 : // taken in the normal astronomical sense, measured from north through east.
108 : void setEndpoints(
109 : const std::pair<casacore::Double, casacore::Double>& center, casacore::Double length,
110 : const casacore::Quantity& pa
111 : );
112 :
113 : void setEndpoints(
114 : const std::pair<casacore::Double, casacore::Double>& center, const casacore::Quantity& length,
115 : const casacore::Quantity& pa
116 : );
117 :
118 : void setEndpoints(
119 : const casacore::MDirection& center, const casacore::Quantity& length,
120 : const casacore::Quantity& pa
121 : );
122 :
123 : // <src>length in pixels</src>
124 : void setEndpoints(
125 : const casacore::MDirection& center, casacore::Double length,
126 : const casacore::Quantity& pa
127 : );
128 :
129 : void setEndpoints(
130 : const casacore::MDirection& start, const casacore::MDirection& end
131 : );
132 :
133 : // Set the number of pixels perpendicular to the slice for which averaging
134 : // should occur. Must be odd and >= 1. 1 => just use the pixels coincident with the slice
135 : // (no averaging). 3 => Average three pixels, one pixel on either side of the slice and the
136 : // pixel lying on the slice.
137 : // Note this average is done after the image has been rotated.
138 : void setWidth(casacore::uInt width);
139 : // This will set the width by rounding <src>q</src> up so that the width is an odd number of pixels.
140 : void setWidth(const casacore::Quantity& q);
141 :
142 : casacore::String getClass() const;
143 :
144 : // set the unit to be used for the offset axis in the resulting image (from calling
145 : // generate()). Must conform to angular units
146 : void setOffsetUnit(const casacore::String& s);
147 :
148 :
149 : protected:
150 47 : inline CasacRegionManager::StokesControl _getStokesControl() const {
151 47 : return CasacRegionManager::USE_ALL_STOKES;
152 : }
153 :
154 47 : inline std::vector<casacore::Coordinate::Type> _getNecessaryCoordinates() const {
155 47 : std::vector<casacore::Coordinate::Type> v;
156 47 : v.push_back(casacore::Coordinate::SPECTRAL);
157 47 : v.push_back(casacore::Coordinate::DIRECTION);
158 47 : return v;
159 0 : }
160 :
161 47 : virtual casacore::Bool _mustHaveSquareDirectionPixels() const {return true;}
162 :
163 : private:
164 : std::unique_ptr<std::vector<casacore::Double> > _start, _end;
165 : casacore::uInt _width;
166 : casacore::String _unit;
167 : static const casacore::String _class;
168 :
169 : void _checkRotatedImageSanity(
170 : SPCIIF rotated, const Vector<Double>& rotPixStart,
171 : const Vector<Double>& rotPixEnd, Int xAxis, Int yAxis,
172 : Double xdiff, Double ydiff
173 : ) const;
174 :
175 : SPIIF _doCollapse(
176 : Int& collapsedAxis, SPCIIF rotated, Int xAxis, Int yAxis, const Vector<Double>& rotPixStart,
177 : const Vector<Double>& rotPixEnd, Double halfwidth
178 : ) const;
179 :
180 : SPCIIF _doRotate(
181 : SPIIF subImage, const std::vector<Double>& start, const std::vector<Double>& end,
182 : Int xAxis, Int yAxis, Double halfwidth, Double paInRad
183 : ) const;
184 :
185 : SPIIF _dropDegen(SPIIF collapsed, Int collapsedAxis) const;
186 :
187 : void _checkWidth(const casacore::Int64 xShape, const casacore::Int64 yShape) const;
188 :
189 : void _checkWidthSanity(
190 : Double paInRad, Double halfwidth, const std::vector<Double>& start,
191 : const std::vector<Double>& end, SPCIIF subImage, Int xAxis, Int yAxis
192 : ) const;
193 :
194 : casacore::Quantity _increment() const;
195 :
196 : void _moveRefPixel(
197 : SPIIF subImage, CoordinateSystem& subCoords, const std::vector<Double>& start,
198 : const std::vector<Double>& end, Double paInDeg, Int xAxis, Int yAxis
199 : ) const;
200 :
201 : static casacore::String _pairToString(const std::pair<casacore::Double, casacore::Double>& p);
202 :
203 : };
204 : }
205 :
206 : #endif
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