Position.h

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//# Position.h: world coordinates of a point on a display panel
//# Copyright (C) 2013
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef CASA_DISPLAY_POSITION_H
#define CASA_DISPLAY_POSITION_H
#include <display/Display/DisplayCoordinateSystem.h>

namespace casa {
        namespace viewer {
                // Why not use MDirection? It's limited by valid astronomical coordinates on the sky Hz vs arcsec does not fly.
                // The idea here is to represent a point, line, plane, etc. (depending on the dimensions of the coordinate
                // system and the coordinate contained here) and eventually have positions which can convert themselves to
                // match different coordinate systems used in other images; removing some of the tangle of linToWorld(...)
                // et al. that snakes through canvases and display datas currently. It may well be that some of this may
                // need to remain in the current canvases/datas, but at least the viewer (and regions) will be able to talk
                // about positions independent of the rest of the viewer hierarchy.
                class Position {
                public:
                        Position( ) { }
                        // Later this could check for consistency between the coordinate and the system...
                        Position( const DisplayCoordinateSystem &cs, const Quantity &x, const Quantity &y ) : csys_(cs), coord_(2) {
                                coord_(0) = x;
                                coord_(1) = y;
                        }
                        // Later this could check for consistency between the coordinate and the system...
                        Position( const DisplayCoordinateSystem &cs, const Quantity &x, const Quantity &y, const Quantity &z ) : csys_(cs), coord_(3) {
                                coord_(0) = x;
                                coord_(1) = y;
                                coord_(2) = z;
                        }
                        Position( const Position &that ) : csys_(that.csys_), coord_(that.coord_) { }

                        const DisplayCoordinateSystem &csys( ) const {
                                return csys_;
                        }
                        const Vector<Quantity> &coord( ) const {
                                return coord_;
                        }

                        void show( std::ostream &out ) const;

                protected:
                        DisplayCoordinateSystem csys_;
                        Vector<Quantity> coord_;
                };

                inline std::ostream &operator<<( std::ostream &out, const casa::viewer::Position &pos ) {
                        pos.show(out);
                        return out;
                }

        }

        inline std::ostream &operator<<( std::ostream &out, const casa::viewer::Position &pos ) {
                pos.show(out);
                return out;
        }
}

inline std::ostream &operator<<( std::ostream &out, const casa::viewer::Position &pos ) {
        pos.show(out);
        return out;
}

#endif