GnomonicProjection.h

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//     ____   ______ __
//    / __ \ / ____// /
//   / /_/ // /    / /
//  / ____// /___ / /___   PixInsight Class Library
// /_/     \____//_____/   PCL 2.6.5
// ----------------------------------------------------------------------------
// pcl/GnomonicProjection.h - Released 2024-01-13T15:47:58Z
// ----------------------------------------------------------------------------
// This file is part of the PixInsight Class Library (PCL).
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// ----------------------------------------------------------------------------
 
#ifndef __PCL_GnomonicProjection_h
#define __PCL_GnomonicProjection_h
 
 
#include <pcl/Defs.h>
 
#include <pcl/ProjectionBase.h>
 
/*
 * Based on original work contributed by Andrés del Pozo.
 */
 
namespace pcl
{
 
// ----------------------------------------------------------------------------
 
class PCL_CLASS GnomonicProjection : public ProjectionBase
{
public:
 
   GnomonicProjection( double ra0, double dec0 )
   {
      m_theta0 = 90;
      m_ra0 = Rad( ra0 );
      m_dec0 = Rad( dec0 );
      SinCos( m_dec0, m_sinDec0, m_cosDec0 );
   }
 
   GnomonicProjection( double scale, double ra0, double dec0 )
      : m_scale( scale )
   {
      m_theta0 = 90;
      m_ra0 = Rad( ra0 );
      m_dec0 = Rad( dec0 );
      SinCos( m_dec0, m_sinDec0, m_cosDec0 );
   }
 
   GnomonicProjection( const GnomonicProjection& ) = default;
 
   ProjectionBase* Clone() const override
   {
      return new GnomonicProjection( *this );
   }
 
   IsoString ProjCode() const override
   {
      return "TAN";
   }
 
   IsoString Identifier() const override
   {
      return "Gnomonic";
   };
 
   IsoString Name() const override
   {
      return "Gnomonic";
   }
 
   bool Direct( DPoint& pW, const DPoint& pRD ) const noexcept override;
 
   bool Inverse( DPoint& pRD, const DPoint& pW ) const noexcept override;
 
   bool CheckBrokenLine( const DPoint& cp1, const DPoint& cp2 ) const noexcept override
   {
      DPoint gp1, gp2;
      return Direct( gp1, cp1 ) && Direct( gp2, cp2 ) &&
            (gp1.x - gp2.x)*(gp1.x - gp2.x) + (gp1.y - gp2.y)*(gp1.y - gp2.y) < 45*45;
   }
 
protected:
 
   bool Project( DPoint& pW, const DPoint& pN ) const noexcept override
   {
      return false;
   }
 
   bool Unproject( DPoint& pN, const DPoint& pW ) const noexcept override
   {
      return false;
   }
 
private:
 
   double m_scale = Const<double>::deg();
   double m_sinDec0;
   double m_cosDec0;
};
 
// ----------------------------------------------------------------------------
 
} // pcl
 
#endif   // __PCL_GnomonicProjection_h
 
// ----------------------------------------------------------------------------
// EOF pcl/GnomonicProjection.h - Released 2024-01-13T15:47:58Z