WCMotionEvent.h

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//# WCMotionEvent.h: class which stores WorldCanvas motion event information
//# Copyright (C) 1993,1994,1995,1996,1998,1999,2000
//# 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_WCMOTIONEVENT_H
#define TRIALDISPLAY_WCMOTIONEVENT_H

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

namespace casa { //# NAMESPACE CASA - BEGIN

class WorldCanvas;

// <summary>
// Class which stores WorldCanvas motion event information.
// </summary>

// <use visibility=export>

// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>

// <etymology>
// "WCMotionEvent" is a contraction and concatentation of
// "WorldCanvas", "Motion" and "Event", and describes motion events
// occuring on WorldCanvases.
// </etymology>

// <synopsis>
// This class adds to the information stored in the <linkto
// class=WorldCanvasEvent>WorldCanvasEvent</linkto> class.  It adds
// informatino describing the current position of the mouse or
// pointing device, and the state of the keyboard modifiers (including 
// the mouse buttons).
// </synopsis>

// <example>
// </example>

// <motivation>
// A compact way of passing motion event information around the
// WorldCanvas-oriented display classes was needed, with a functional
// but tight and efficient interface.
// </motivation>

// <thrown>
// None.
// </thrown>

// <todo asof="1999/10/15">
// None.
// </todo>

class WCMotionEvent : public WorldCanvasEvent {

 public:

  // Constructor taking a pointer to the WorldCanvas for which the
  // event is valid, the state of the keyboard and pointer modifiers,
  // and the pixel, linear and world coordinates of the event.
  WCMotionEvent(WorldCanvas *wc, const uInt &modifiers,
                const Int &pixX, const Int &pixY, 
                const Double &linX, const Double &linY,
                const Vector<Double> &world);
  
  // copy constructor.
  WCMotionEvent(const WCMotionEvent &other);

  // Destructor.
  virtual ~WCMotionEvent();

  // The x and y pixel position of the pointer when the event
  // occurred.
  // <group>
  virtual Int pixX() const 
    { return itsPixX; }
  virtual Int pixY() const 
    { return itsPixY; }
  // </group>

  // The x and y linear coordinates of the event.
  // <group>
  virtual Double linX() const 
    { return itsLinX; }
  virtual Double linY() const 
    { return itsLinY; }
  // </group>

  // The world coordinates describing where the event occurred.
  virtual const Vector<Double> &world() const 
    { return itsWorld; }
  
  // Return the state of the "modifiers": this is made up of mask bits 
  // referring to various keys on the keyboard (eg. Control, Shift,
  // etc.) and the mouse buttons.
  virtual uInt modifiers() const 
    { return itsModifiers; }
  
 protected:

  // (Required) default constructor.
  WCMotionEvent();

  // (Required) copy assignment.
  WCMotionEvent &operator=(const WCMotionEvent &other);
  friend class QtDisplayPanel;          /*** to access assignment operator to save "last event" ***/

 private:
  
  // Store the pixel position of the event here.
  Int itsPixX, itsPixY;

  // Store the linear position of the event here.
  Double itsLinX, itsLinY;

  // Store the world position of the event here.
  Vector<Double> itsWorld;

  // Store the button and keyboard modifier masks here.
  uInt itsModifiers;

};


} //# NAMESPACE CASA - END

#endif