WCPGFilter.h

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//# WCPGFilter.h: interface between WorldCanvas and its PGPLOT driver
//# Copyright (C) 1993,1994,1995,1996,1998,1999,2000,2001
//# 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_WCPGFILTER_H
#define TRIALDISPLAY_WCPGFILTER_H

#include <casa/aips.h>

namespace casa { //# NAMESPACE CASA - BEGIN

        class WorldCanvas;
        template <class T> class Matrix;
        template <class T> class Vector;

// <summary>
// Interface between the WorldCanvas and its PGPLOT driver.
// </summary>

// <use visibility=export>

// <reviewed>
// </reviewed>

// <prerequisite>
// <li> none
// </prerequisite>

// <etymology>
// "WCPGFilter" is a contraction and concatenation of "WorldCanvas,"
// "PGPLOT" and "Filter", and is a simple filtering interface between
// the WorldCanvas and its PGPLOT driver.
// </etymology>

// <synopsis>
// </synopsis>

// <motivation>
// </motivation>

// <example>
// </example>

// <todo>
// </todo>

        class WCPGFilter {

        public:

                // Constructor taking a pointer to a WorldCanvas.
                WCPGFilter(WorldCanvas *wc);

                // Destructor.
                virtual ~WCPGFilter();

                // Reference counting: ref, unref and refCount.
                // <group>
                virtual void ref() {
                        itsRefCount++;
                }
                virtual void unref() {
                        itsRefCount--;
                }
                virtual Int refCount() const {
                        return itsRefCount;
                }
                // </group>

                // Return the PGPLOT device id.
                virtual Int pgid() const {
                        return Int(itsPgPlotID);
                }

                // Realign the PGPLOT domain to the WorldCanvas domain.  If linear
                // is False, then the pgplot canvas is setup to match the world
                // coordinates, but of course is only valid where the world
                // coordinates are linear to first approximation.
                Bool realign(const Bool &linear = True);

                // Contour using pgcont function.
                void cont(const Matrix<Float> &m,
                          const Vector<Float> &levels,
                          const Matrix<Float> &tr);

                // Contour using pgconb function. (contour with blanks)
                void conb(const Matrix<Float> &m,
                          const Vector<Float> &levels,
                          const Matrix<Float> &tr,
                          const Float blank);

        private:

                // Store for the WorldCanvas this filters for.
                WorldCanvas *itsWorldCanvas;

                // Store the PGPLOT device id here.
                uInt itsPgPlotID;

                // Reference counting.
                Int itsRefCount;

                // Split contours into positive and negative
                void splitContours (Vector<Float>& neg, Vector<Float>& pos,
                                    const Vector<Float>& levels);


        };


} //# NAMESPACE CASA - END

#endif