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#ifndef _SpatialVector_h
#define _SpatialVector_h
//# Filename: SpatialVector.h
//#
//# Standard 3-d vector class
//#
//# Author: Peter Z. Kunszt, based on A. Szalay's code
//#
//# Date: October 15, 1998
//#
//# SPDX-FileCopyrightText: 2000 Peter Z. Kunszt Alex S. Szalay, Aniruddha R. Thakar
//# The Johns Hopkins University
//#
//# Modification History:
//#
//# Oct 18, 2001 : Dennis C. Dinge -- Replaced ValVec with std::vector
//#
#include <cmath>
#include <SpatialGeneral.h>
//########################################################################
/**
@class SpatialVector
SpatialVector is a 3D vector usually living on the surface of
the sphere. The corresponding ra, dec can be obtained if the vector
has unit length. That can be ensured with the normalize() function.
*/
class LINKAGE SpatialVector
{
public:
/// constructs (1,0,0), ra=0, dec=0.
SpatialVector();
/// Constructor from three coordinates, not necessarily normed to 1
SpatialVector(float64 x, float64 y, float64 z);
/// Constructor from ra/dec, this is always normed to 1
SpatialVector(float64 ra, float64 dec);
/// Set member function: set values - always normed to 1
void set(const float64 &x, const float64 &y, const float64 &z);
/// Set member function: set values - always normed to 1
void set(const float64 &ra, const float64 &dec);
/// Get x,y,z
void get(float64 &x, float64 &y, float64 &z) const;
/// Get ra,dec - normalizes x,y,z
void get(float64 &ra, float64 &dec);
/// return length of vector
float64 length() const;
/// return x (only as rvalue)
float64 x() const { return x_; }
/// return y
float64 y() const { return y_; }
/// return z
float64 z() const { return z_; }
/// return ra - this norms the vector to 1 if not already done so
float64 ra();
/// return dec - this norms the vector to 1 if not already done so
float64 dec();
/// Normalize vector length to 1
void normalize();
/// Comparison
int operator==(const SpatialVector &) const;
/// dot product
float64 operator*(const SpatialVector &)const;
/// cross product
SpatialVector operator^(const SpatialVector &) const;
/// addition
SpatialVector operator+(const SpatialVector &) const;
/// subtraction
SpatialVector operator-(const SpatialVector &) const;
/** @name Scalar products with int and float */
//@{
/** @name operator *= */
SpatialVector &operator*=(float64);
SpatialVector &operator*=(int);
friend SpatialVector operator*(float64, const SpatialVector &);
friend SpatialVector operator*(int, const SpatialVector &);
friend SpatialVector operator*(const SpatialVector &, float64);
friend SpatialVector operator*(const SpatialVector &, int);
//@}
private:
float64 x_;
float64 y_;
float64 z_;
float64 ra_;
float64 dec_;
bool okRaDec_;
void updateXYZ();
void updateRaDec();
friend class SpatialIndex;
};
// Friend operators
SpatialVector operator*(float64, const SpatialVector &);
SpatialVector operator*(int, const SpatialVector &);
SpatialVector operator*(const SpatialVector &, float64);
SpatialVector operator*(const SpatialVector &, int);
#endif
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