MWCRTZoomer.h

Go to the documentation of this file.

//# MWCRTZoomer.h: MultiWorldCanvas event-based zoomer
//# Copyright (C) 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_MWCRTZOOMER_H
#define TRIALDISPLAY_MWCRTZOOMER_H

#include <casa/aips.h>
#include <casa/Arrays/Vector.h>
#include <display/DisplayEvents/MWCRectTool.h>

namespace casa { //# NAMESPACE CASA - BEGIN

// <summary>
// Multi WorldCanvas event-based zoomer
// </summary>
//
// <use visibility=export>
//
// <reviewed reviewer="" data="yyyy/mm/dd" tests="" demos="">
// </reviewed>
//
// <prerequisites>
//   <li> WCRectTool
// </prerequisites>
//
// <etymology>
// MWCRTZoomer stands for WorldCanvas Rectangling Tool Zoomer
// </etymology>
//
// <synopsis>
// This class finalises the functionality in WCRectTool to implement
// event-based zooming on a WorldCanvas.  casacore::Double clicking inside the
// constructed rectangle results in zooming in; double clicking outside
// the rectangle gives zooming out.
// </synopsis>
//
// <example>
// </example>
//
// <motivation>
// Zooming is an essential tool for interacting with data displays.
// </motivation>
//
// <todo asof="1999/02/10">
//   <li> Nothing known
// </todo>

        class MWCRTZoomer : public MWCRectTool {

        public:

                // Constructor
                MWCRTZoomer(Display::KeySym keysym = Display::K_Pointer_Button1);

                // Destructor
                virtual ~MWCRTZoomer();

                // This function resets the zoom
                virtual void unzoom();

                //This function zooms with a given blc,trc
                virtual void zoom(const casacore::Vector<casacore::Double> &linBlc,
                                  const casacore::Vector<casacore::Double> &linTrc);

                // zoom in/out by given factor
                //<group>
                virtual void zoomIn(casacore::Double factor=2.);
                virtual void zoomOut(casacore::Double factor=2.);
                //</group>

        protected:

                // Handle double-click inside or outside the rectangle; called by
                // the base class when these events occur.  They execute
                // zoom-in/zoom-out on the tool's active WC's (which should all
                // have indentical linear coordinates for their draw areas--they
                // certainly will have, after a zoom).
                // Then the routines invoke the zoomed() callback, below.
                // <group>
                virtual void doubleInside();
                virtual void doubleOutside();
                // </group>

                // This function is called when a zoom occurs.  It is supplied
                // with the linear coords of the new zoom box, and thus can be
                // implemented to do further actions, such as reporting the
                // new zoom box to the application
                virtual void zoomed(const casacore::Vector<casacore::Double> &linBlc,
                                    const casacore::Vector<casacore::Double> &linTrc);

        private:

                // get the linear coords of the current zoom box
                void getLinearCoords(casacore::Vector<casacore::Double> &blc, casacore::Vector<casacore::Double> &trc);

        };


} //# NAMESPACE CASA - END

#endif