WCCSAxisLabeller.h

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//# WCCSAxisLabeller.h: labelling axes using a DisplayCoordinateSystem on a WC
//# Copyright (C) 1999,2000,2001,2002
//# 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 TRIALDISPLAY_WCCSAXISLABELLER_H
#define TRIALDISPLAY_WCCSAXISLABELLER_H

#include <casa/aips.h>
#include <display/Display/DisplayCoordinateSystem.h>
#include <display/DisplayCanvas/WCAxisLabeller.h>

namespace casa { //# NAMESPACE CASA - BEGIN

// <summary>
// Base class for WorldCanvas axis labelling using a DisplayCoordinateSystem.
// </summary>
//
// <synopsis>
// This (base) class adds to the interface of WCAxisLabeller functions
// which support the use/provision of a DisplayCoordinateSystem to assist with
// axis labelling.
// </synopsis>

        class WCCSAxisLabeller : public WCAxisLabeller {

        public:
                enum SpecAxisType { // taken from the FITS spectral coordinate type codes
                    FREQ,
                    VELO,
                    WAVE,
                    AWAV,
                };

                // Constructor
                WCCSAxisLabeller();

                // Destructor
                virtual ~WCCSAxisLabeller();

                // Install a DisplayCoordinateSystem.
                //#dk note: See Bool useWCCS, below; in some cases the WorldCanvas's
                //#   own CS is now used to draw labels, although the CS set here is
                //#   still needed for certain things (default user interface, e.g.)
                //#   when the WC is unknown.  (10/07)
                virtual void setCoordinateSystem(const DisplayCoordinateSystem& coordsys);

                // Get the DisplayCoordinateSystem.
                virtual DisplayCoordinateSystem coordinateSystem() const {
                        return itsCoordinateSystem;
                }

                // Has a CS been set?
                Bool hasCoordinateSystem() const {
                        return itsHasCoordinateSystem;
                };

                // Setting this True allows the labeller to use the WorldCanvas's
                // own CS to draw labels (although itsCoordinateSystem is still
                // needed for certain things at present).  Default: False.
                //#dk (See WCCSNLAxisLabeller::draw() and usage in PADD::setupElements()).
                //#
                //# (Kludge upon kludge, I know... all stemming from the original design
                //# flaw: not realizing that WC needs its _own CS_ (related to but _not
                //# the same_ as the Images'), and then trying to tack one on later...).
                Bool useWCCS;

                // install the default options for this labeller.
                virtual void setDefaultOptions();

                // apply options stored in rec to the labeller; return value
                // True means a refresh is needed.  Any fields added to the
                // updatedOptions argument are options which have changed in
                // some way due to the setting of other options - ie. they
                // are context sensitive.
                virtual Bool setOptions(const Record &rec, Record &updatedOptions);

                // retrieve the current and default options and parameter types.
                virtual Record getOptions() const;

                // return the X and Y label text - over-ridden from base class
                // <group>
                //# virtual String xAxisText(WorldCanvas* wc=0) const;
                //# virtual String yAxisText(WorldCanvas* wc=0) const;
                //# (Compiler whines unless you do it this way instead... grr...).
                virtual String xAxisText(WorldCanvas* wc) const;
                virtual String yAxisText(WorldCanvas* wc) const;
                virtual String xAxisText() const {
                        return xAxisText(0);
                }
                virtual String yAxisText() const {
                        return yAxisText(0);
                }
                // </group>

                virtual String zLabelType() const {
                        return itsZLabelType;
                };

                virtual String zLabelPos() const {
                        return itsZLabelPos;
                };

                virtual void setZIndex(Int zindex) {
                        itsZIndex = zindex;
                };

                // DD 'Absolute Pixel Coordinates', e.g. channel numbers, are internally
                // 0-based (they begin numbering at 0), but 'Absolute Pixel coordinates'
                // have traditionally been displayed as 1-based in the glish viewer.
                // uiBase_, and related methods uiBase() and setUIBase(), allow newer
                // (python/Qt-based) code to cause such labelling to be produced with
                // 0-based values instead.  Unless setUIBase(0) is called, the
                // traditional 1-based labelling behavior is retained by default.
                //
                // If you are using 0-basing for 'Absolute Pixel Coordinate' labelling,
                // you should call setUIBase(0), before using draw().
                // <group>
                virtual Int uiBase() const {
                        return uiBase_;
                }

                virtual void setUIBase(Int uibase) {
                        if(uibase==0 || uibase==1) uiBase_ = uibase;
                }
                // </group>


                const String &spectralunitStr( ) const {
                        return itsSpectralUnit;
                }

        Int spectralprec( ) const {
            return itsSpectralPrecision;
        }

        protected:
                Bool itsAbsolute;
                Bool itsWorldAxisLabels;
                mutable WCCSAxisLabeller::SpecAxisType itsSpecAxisType;
                Int itsZIndex;

                // Set spectral state onto given CS
                void setSpectralState(DisplayCoordinateSystem& cs) const;

                // Set direction state onto given CS
                void setDirectionState(DisplayCoordinateSystem& cs) const;

        private:

                DisplayCoordinateSystem itsCoordinateSystem;
                Bool itsHasCoordinateSystem;
                Int    itsSpectralPrecision;
                String itsSpectralUnit;
                String itsSpectralQuantity;
                String itsSpectralTypeUnit;
                String itsDirectionUnit;
                String itsDirectionSystem;
                String itsFrequencySystem;
                String itsZLabelType;
                String itsZLabelPos;
                String itsRestValue;      // rest frequency or wavelength (value and unit)
                String itsRestUnit;       // unit for rest frequency or wavelength

                Int uiBase_;            // (initialized to 1; see uiBase(), above).

                // Generate axis text for specified axis
                //# String axisText(Int worldAxis, WorldCanvas* wc=0) const;
                //# (Compiler whines unless you do it this way instead... grr...).
                String axisText(Int worldAxis, WorldCanvas* wc) const;
                String axisText(Int worldAxis) const {
                        return axisText(worldAxis, 0);
                }

                // Set new spectral state in itsCoordinateSystem
                void setSpectralState() {
                        setSpectralState(itsCoordinateSystem);
                }

                // Set new direction state in itsCoordinateSystem
                void setDirectionState() {
                        setDirectionState(itsCoordinateSystem);
                }

                // Set absolute/relative state in itsCoordinateSystem
                void setAbsRelState();

                // "optical velocity [m/s]" --> "optical velocity" and "m/s"
                void distributeTypeUnit() ;

                static const String FRAME_REST;
        };


} //# NAMESPACE CASA - END

#endif