GWcsCAR.cpp
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/***************************************************************************
* GWcsCAR.cpp - Cartesian projection class *
* ----------------------------------------------------------------------- *
* copyright (C) 2010 by Jurgen Knodlseder *
* ----------------------------------------------------------------------- *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* ----------------------------------------------------------------------- *
***************************************************************************/
/**
* @file GWcsCAR.cpp
* @brief GWcsCAR class implementation.
* @author J. Knodlseder
*/
/* __ Includes ___________________________________________________________ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "GException.hpp"
#include "GTools.hpp"
#include "GWcsCAR.hpp"
/* __ Method name definitions ____________________________________________ */
#define G_XY2DIR "GWcsCAR::pix2dir(int)"
#define G_DIR2XY "GWcsCAR::dir2pix(GSkyDir)"
/* __ Macros _____________________________________________________________ */
/* __ Coding definitions _________________________________________________ */
/* __ Debug definitions __________________________________________________ */
/* __ Local prototypes ___________________________________________________ */
/* __ Constants __________________________________________________________ */
/* __ Static conversion arrays ___________________________________________ */
/*==========================================================================
= =
= GWcsCAR constructors/destructors =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Void constructor
***************************************************************************/
GWcsCAR::GWcsCAR(void) : GWcs()
{
// Initialise class members
init_members();
// Return
return;
}
/***********************************************************************//**
* @brief Constructor
*
* @param[in] coords Coordinate system.
* @param[in] crval1 X value of reference pixel.
* @param[in] crval1 Y value of reference pixel.
* @param[in] crpix1 X index of reference pixel.
* @param[in] crpix2 Y index of reference pixel.
* @param[in] cdelt1 Increment in x direction at reference pixel (deg).
* @param[in] cdelt2 Increment in y direction at reference pixel (deg).
* @param[in] cd Astrometry parameters (2x2 matrix, deg/pixel).
* @param[in] pv2 Projection parameters (length WCS type dependent).
***************************************************************************/
GWcsCAR::GWcsCAR(const std::string& coords,
const double& crval1, const double& crval2,
const double& crpix1, const double& crpix2,
const double& cdelt1, const double& cdelt2,
const GMatrix& cd, const GVector& pv2) :
GWcs(coords, crval1, crval2, crpix1, crpix2, cdelt1, cdelt2)
{
// Initialise class members
init_members();
// Initialise derived projection parameters
wcs_init(0.0); // theta0 = 0.0
// Set projection function pointers
m_std2nat = (_wcspf)&GWcsCAR::std2nat;
m_nat2std = (_wcspf)&GWcsCAR::nat2std;
// Return
return;
}
/***********************************************************************//**
* @brief Constructor from FITS HDU table
*
* @param[in] hdu Pointer to FITS HDU.
***************************************************************************/
GWcsCAR::GWcsCAR(const GFitsHDU* hdu) : GWcs()
{
// Initialise class members
init_members();
// Read Healpix defintion from FITS HDU
read(hdu);
// Return
return;
}
/***********************************************************************//**
* @brief Copy constructor
*
* @param[in] wcs GWcsCAR instance which should be used for construction.
***************************************************************************/
GWcsCAR::GWcsCAR(const GWcsCAR& wcs) : GWcs(wcs)
{
// Initialise class members for clean destruction
init_members();
// Copy members
copy_members(wcs);
// Return
return;
}
/***********************************************************************//**
* @brief Destructor
***************************************************************************/
GWcsCAR::~GWcsCAR()
{
// Free members
free_members();
// Return
return;
}
/*==========================================================================
= =
= GWcsCAR operators =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Assignment operator
*
* @param[in] wcs GWcsHPX instance to be assigned.
***************************************************************************/
GWcsCAR& GWcsCAR::operator= (const GWcsCAR& wcs)
{
// Execute only if object is not identical
if (this != &wcs) {
// Copy base class members
this->GWcs::operator=(wcs);
// Free members
free_members();
// Initialise private members for clean destruction
init_members();
// Copy members
copy_members(wcs);
} // endif: object was not identical
// Return this object
return *this;
}
/*==========================================================================
= =
= GWcsCAR public methods =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Read WCS definiton from FITS header
*
* @param[in] hdu FITS HDU containing the Healpix definition.
***************************************************************************/
void GWcsCAR::read(const GFitsHDU* hdu)
{
// Free memory and initialise members
free_members();
init_members();
// Continue only if HDU is valid
if (hdu != NULL) {
// Read standard WCS definition
wcs_read(hdu);
} // endif: HDU was valid
// Return
return;
}
/***********************************************************************//**
* @brief Write Healpix definiton into FITS HDU
*
* @param[in] hdu FITS HDU to which the Healpix definition will be written.
***************************************************************************/
void GWcsCAR::write(GFitsHDU* hdu) const
{
// Continue only if HDU is valid
if (hdu != NULL) {
// Write standard WCS definition
wcs_write(hdu);
} // endif: HDU was valid
// Return
return;
}
/***********************************************************************//**
* @brief Returns solid angle of pixel
*
* @param[in] pix Pixel index (x,y)
***************************************************************************/
double GWcsCAR::omega(const GSkyPixel& pix) const
{
// TODO: Implement
// Return solid angle
return 0.0;
}
/*==========================================================================
= =
= GWcsCAR private methods =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Initialise class members
***************************************************************************/
void GWcsCAR::init_members(void)
{
// Initialise members
m_type = "CAR";
// Return
return;
}
/***********************************************************************//**
* @brief Copy class members
*
* @param[in] wcs GWcsCAR instance from which members should be copied.
***************************************************************************/
void GWcsCAR::copy_members(const GWcsCAR& wcs)
{
// Copy attributes
// Return
return;
}
/***********************************************************************//**
* @brief Delete class members
***************************************************************************/
void GWcsCAR::free_members(void)
{
// Return
return;
}
/***********************************************************************//**
* @brief Clone instance
***************************************************************************/
GWcsCAR* GWcsCAR::clone(void) const
{
return new GWcsCAR(*this);
}
/***********************************************************************//**
* @brief Projects from standard to native coordinates
*
* @param[in,out] coord Pointer to coordinate vector.
*
* Transforms coordinate vector from the standard coordinate system to the
* native coordinate system.
***************************************************************************/
void GWcsCAR::std2nat(GVector *coord) const
{
// Perform CAR projection
*coord *= rad2deg;
// Return
return;
}
/***********************************************************************//**
* @brief Projects from native to standard coordinates
*
* @param[in,out] coord Pointer to coordinate vector.
*
* Transforms coordinate vector from the native coordinate system to the
* standard coordinate system.
***************************************************************************/
void GWcsCAR::nat2std(GVector *coord) const
{
// Perform CAR projection
*coord *= deg2rad;
// Return
return;
}
/*==========================================================================
= =
= GWcsCAR friends =
= =
==========================================================================*/
/***********************************************************************//**
* @brief Output operator
*
* @param[in] os Output stream.
* @param[in] wcs Healpix WCS definition to put in output stream
***************************************************************************/
std::ostream& operator<< (std::ostream& os, const GWcsCAR& wcs)
{
// Put header in stream
os << "=== GWcsCAR ===" << std::endl;
// Add WCS information
wcs.wcs_dump(os);
// Return output stream
return os;
}