[1069] | 1 | // ----------------------------------------------------------------------- |
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| 2 | // Beam.cc: Basic beam-handling functionality |
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| 3 | // ----------------------------------------------------------------------- |
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| 4 | // Copyright (C) 2006, Matthew Whiting, ATNF |
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| 5 | // |
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| 6 | // This program is free software; you can redistribute it and/or modify it |
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| 7 | // under the terms of the GNU General Public License as published by the |
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| 8 | // Free Software Foundation; either version 2 of the License, or (at your |
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| 9 | // option) any later version. |
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| 10 | // |
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| 11 | // Duchamp is distributed in the hope that it will be useful, but WITHOUT |
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| 12 | // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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| 13 | // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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| 14 | // for more details. |
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| 15 | // |
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| 16 | // You should have received a copy of the GNU General Public License |
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| 17 | // along with Duchamp; if not, write to the Free Software Foundation, |
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| 18 | // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA |
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| 19 | // |
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| 20 | // Correspondence concerning Duchamp may be directed to: |
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| 21 | // Internet email: Matthew.Whiting [at] atnf.csiro.au |
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| 22 | // Postal address: Dr. Matthew Whiting |
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| 23 | // Australia Telescope National Facility, CSIRO |
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| 24 | // PO Box 76 |
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| 25 | // Epping NSW 1710 |
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| 26 | // AUSTRALIA |
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| 27 | // ----------------------------------------------------------------------- |
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[788] | 28 | #include <iostream> |
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| 29 | #include <math.h> |
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[1053] | 30 | #include <duchamp/FitsIO/Beam.hh> |
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| 31 | #include <duchamp/duchamp.hh> |
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[788] | 32 | |
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| 33 | namespace duchamp |
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| 34 | { |
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| 35 | |
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| 36 | Beam::Beam(): |
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| 37 | itsMaj(0), itsMin(0), itsPA(0), itsArea(0) |
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| 38 | { |
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| 39 | } |
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| 40 | |
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| 41 | Beam::Beam(float maj, float min, float pa): |
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| 42 | itsMaj(maj),itsMin(min),itsPA(pa) |
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| 43 | { |
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| 44 | this->calculateArea(); |
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| 45 | } |
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| 46 | |
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| 47 | Beam::Beam(const Beam &b) |
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| 48 | { |
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| 49 | operator=(b); |
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| 50 | } |
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| 51 | |
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| 52 | Beam& Beam::operator=(const Beam &b) |
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| 53 | { |
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| 54 | if(this == &b ) return *this; |
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| 55 | this->itsMaj = b.itsMaj; |
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| 56 | this->itsMin = b.itsMin; |
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| 57 | this->itsPA = b.itsPA; |
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| 58 | this->itsArea = b.itsArea; |
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| 59 | return *this; |
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| 60 | } |
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| 61 | |
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| 62 | void Beam::calculateArea() |
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| 63 | { |
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| 64 | this->itsArea = M_PI * (this->itsMaj/2.) * (this->itsMin/2.) / M_LN2; |
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| 65 | } |
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| 66 | |
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| 67 | void Beam::areaToFWHM() |
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| 68 | { |
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| 69 | float fwhm = 2.*sqrt( this->itsArea * M_LN2 / M_PI ); |
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| 70 | this->itsMaj = fwhm; |
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| 71 | this->itsMin = fwhm; |
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| 72 | this->itsPA = 0.; |
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| 73 | } |
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| 74 | |
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| 75 | void Beam::define(float maj, float min, float pa) |
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| 76 | { |
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| 77 | this->itsMaj = maj; |
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| 78 | this->itsMin = min; |
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| 79 | this->itsPA = pa; |
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| 80 | this->calculateArea(); |
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| 81 | } |
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| 82 | |
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| 83 | void Beam::setFWHM(float fwhm) |
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| 84 | { |
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| 85 | this->itsMaj = fwhm; |
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| 86 | this->itsMin = fwhm; |
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| 87 | this->itsPA = 0.; |
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| 88 | this->calculateArea(); |
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| 89 | } |
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| 90 | |
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| 91 | void Beam::setArea(float area) |
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| 92 | { |
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| 93 | this->itsArea = area; |
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| 94 | this->areaToFWHM(); |
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| 95 | } |
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| 96 | |
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| 97 | |
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| 98 | } |
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