Support for XISF
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// ____ ______ __
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// / __ \ / ____// /
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// / /_/ // / / /
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// / ____// /___ / /___ PixInsight Class Library
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// /_/ \____//_____/ PCL 2.4.23
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// ----------------------------------------------------------------------------
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// pcl/ProjectionBase.h - Released 2022-03-12T18:59:29Z
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// ----------------------------------------------------------------------------
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// This file is part of the PixInsight Class Library (PCL).
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// PCL is a multiplatform C++ framework for development of PixInsight modules.
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//
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// Copyright (c) 2003-2022 Pleiades Astrophoto S.L. All Rights Reserved.
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//
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// Redistribution and use in both source and binary forms, with or without
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// modification, is permitted provided that the following conditions are met:
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//
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// 1. All redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// 2. All redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Neither the names "PixInsight" and "Pleiades Astrophoto", nor the names
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// of their contributors, may be used to endorse or promote products derived
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// from this software without specific prior written permission. For written
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// permission, please contact info@pixinsight.com.
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//
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// 4. All products derived from this software, in any form whatsoever, must
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// reproduce the following acknowledgment in the end-user documentation
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// and/or other materials provided with the product:
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//
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// "This product is based on software from the PixInsight project, developed
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// by Pleiades Astrophoto and its contributors (https://pixinsight.com/)."
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//
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// Alternatively, if that is where third-party acknowledgments normally
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// appear, this acknowledgment must be reproduced in the product itself.
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//
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// THIS SOFTWARE IS PROVIDED BY PLEIADES ASTROPHOTO AND ITS CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL PLEIADES ASTROPHOTO OR ITS
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, BUSINESS
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// INTERRUPTION; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; AND LOSS OF USE,
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// DATA OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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// ----------------------------------------------------------------------------
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#ifndef __PCL_ProjectionBase_h
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#define __PCL_ProjectionBase_h
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/// \file pcl/ProjectionBase.h
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#include <pcl/Defs.h>
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#include <pcl/Optional.h>
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#include <pcl/Point.h>
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#include <pcl/SphericalRotation.h>
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#include <pcl/WCSKeywords.h>
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/*
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* Based on original work contributed by Andrés del Pozo.
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*/
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namespace pcl
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{
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// ----------------------------------------------------------------------------
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/*!
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* \class ProjectionBase
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* \brief Base class of all projection systems
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*
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* \ingroup astrometry_support
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*/
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class PCL_CLASS ProjectionBase
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{
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public:
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/*!
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* Virtual destructor.
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*/
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virtual ~ProjectionBase()
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{
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}
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/*!
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* Returns a dynamically allocated duplicate of this object.
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*/
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virtual ProjectionBase* Clone() const = 0;
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/*!
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* Returns the WCS projection identifier for this projection system.
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*/
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virtual IsoString ProjCode() const = 0;
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/*!
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* Returns the readable name of this projection system.
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*/
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virtual IsoString Name() const = 0;
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/*!
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* Updates the specified WCS metadata with field values corresponding to
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* this projection.
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*/
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virtual void GetWCS( WCSKeywords& wcs ) const;
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/*!
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*
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*/
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void InitFromRefPoint( double lng0, double lat0, const Optional<double>& phip = Optional<double>() );
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/*!
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* Transforms from celestial coordinates to world coordinates.
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*/
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virtual bool Direct( DPoint& pW, const DPoint& pRD ) const noexcept
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{
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DPoint pN = m_sph.CelestialToNative( pRD );
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return IsFinite( pN.x ) && IsFinite( pN.y ) && Project( pW, pN );
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}
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/*!
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* Transforms from world coordinates to celestial coordinates.
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*/
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virtual bool Inverse( DPoint& pRD, const DPoint& pW ) const noexcept
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{
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DPoint pN;
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if ( Unproject( pN, pW ) )
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if ( IsFinite( pN.x ) )
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if ( IsFinite( pN.y ) )
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{
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pRD = m_sph.NativeToCelestial( pN );
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return true;
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}
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return false;
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}
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/*!
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*
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*/
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virtual bool CheckBrokenLine( const DPoint& cp1, const DPoint& cp2 ) const noexcept
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{
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return DistanceFast( m_sph.CelestialToNative( cp1 ), m_sph.CelestialToNative( cp2 ) ) < 150;
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}
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/*!
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* Returns the equatorial coordinates of the projection origin.
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*/
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virtual DPoint ProjectionOrigin() const
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{
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return DPoint( Deg( m_ra0 ), Deg( m_dec0 ) );
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}
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/*!
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* Returns the distance in degrees between two locations in equatorial
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* coordinates.
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*/
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static double Distance( const DPoint& p1, const DPoint& p2 )
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{
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double sinX, cosX;
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SinCos( Rad( Abs( p1.x - p2.x ) ), sinX, cosX );
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double sinY1, cosY1;
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SinCos( Rad( p1.y ), sinY1, cosY1 );
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double sinY2, cosY2;
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SinCos( Rad( p2.y ), sinY2, cosY2 );
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double K = cosY1*sinY2 - sinY1*cosY2*cosX;
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return Deg( ArcTan( Sqrt( cosY2*sinX*cosY2*sinX + K*K ), sinY1*sinY2 + cosY1*cosY2*cosX ) );
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};
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/*!
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* Returns the distance in degrees between two locations in equatorial
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* coordinates. Uses an approximate, faster algorithm.
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*/
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static double DistanceFast( const DPoint& p1, const DPoint& p2 )
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{
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double sinY1, cosY1;
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SinCos( Rad( p1.y ), sinY1, cosY1 );
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double sinY2, cosY2;
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SinCos( Rad( p2.y ), sinY2, cosY2 );
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return Deg( ArcCos( sinY1*sinY2 + cosY1*cosY2*Cos( Rad( p1.x - p2.x ) ) ) );
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}
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protected:
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double m_ra0 = 0; // radians
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double m_dec0 = 0; // radians
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double m_theta0 = 0; // degrees
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double m_phi0 = 0; // degrees
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Optional<double> m_lonpole; // degrees
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Optional<double> m_latpole; // degrees
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SphericalRotation m_sph;
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/*!
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* Default constructor.
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*/
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ProjectionBase() = default;
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/*!
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* Copy constructor.
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*/
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ProjectionBase( const ProjectionBase& ) = default;
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/*!
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* Initialization from WCS metadata.
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*/
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void InitFromWCS( const WCSKeywords& );
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/*!
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* Transforms from world coordinates to native spherical coordinates.
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*/
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virtual bool Project( DPoint& pW, const DPoint& pN ) const noexcept = 0;
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/*!
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* Transforms from native spherical coordinates to world coordinates.
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*/
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virtual bool Unproject( DPoint& pN, const DPoint& pW ) const noexcept = 0;
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friend class ProjectionFactory;
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};
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// ----------------------------------------------------------------------------
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} // pcl
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#endif // __PCL_ProjectionBase_h
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// ----------------------------------------------------------------------------
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// EOF pcl/ProjectionBase.h - Released 2022-03-12T18:59:29Z
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