cartesian.h

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/*
    Copyright (C) 2010 Paul Davis

    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.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef __libpbd_cartesian_h__
#define __libpbd_cartesian_h__

#include <cfloat>
#include <cmath>

#include "pbd/libpbd_visibility.h"

namespace PBD {

LIBPBD_API void spherical_to_cartesian (double azi, double ele, double len, double& x, double& y, double& z);
LIBPBD_API void cartesian_to_spherical (double x, double y, double z, double& azi, double& ele, double& len);
        
struct AngularVector;

struct LIBPBD_API CartesianVector {
        double x;
        double y;
        double z;

        CartesianVector () : x(0.0), y(0.0), z(0.0) {}
        CartesianVector (double xp, double yp, double zp = 0.0) : x(xp), y(yp), z(zp) {}

        CartesianVector& translate (CartesianVector& other, double xtranslate, double ytranslate, double ztranslate = 0.0) {
                other.x += xtranslate;
                other.y += ytranslate;
                other.z += ztranslate;
                return other;
        }

        CartesianVector& scale (CartesianVector& other, double xscale, double yscale, double zscale = 1.0) {
                other.x *= xscale;
                other.y *= yscale;
                other.z *= zscale;
                return other;
        }

        inline void angular (AngularVector& a) const;
};

struct LIBPBD_API AngularVector {
        double azi;
        double ele;
        double length;

        AngularVector () : azi(0.0), ele(0.0), length (0.0) {}
        AngularVector (double a, double e, double l = 1.0) : azi(a), ele(e), length (l) {}

        AngularVector operator- (const AngularVector& other) const {
                AngularVector r;
                r.azi = azi - other.azi;
                r.ele = ele - other.ele;
                r.length = length - other.length;
                return r;
        }

        AngularVector operator+ (const AngularVector& other) const {
                AngularVector r;
                r.azi = azi + other.azi;
                r.ele = ele + other.ele;
                r.length = length + other.length;
                return r;
        }

        bool operator== (const AngularVector& other) const {
                return fabs (azi - other.azi) <= FLT_EPSILON &&
                fabs (ele - other.ele) <= FLT_EPSILON &&
                fabs (length - other.length) <= FLT_EPSILON;
        }

        bool operator!= (const AngularVector& other) const {
                return fabs (azi - other.azi) > FLT_EPSILON ||
                        fabs (ele - other.ele) > FLT_EPSILON ||
                        fabs (length - other.length) > FLT_EPSILON;
        }

        void cartesian (CartesianVector& c) const {
                spherical_to_cartesian (azi, ele, length, c.x, c.y, c.z);
        }
};

inline void CartesianVector::angular (AngularVector& a) const {
        cartesian_to_spherical (x, y, z, a.azi, a.ele, a.length);
}

}

#endif /* __libpbd_cartesian_h__ */