MultiPVTool.h

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//# MultiPVTool.h: Base class for MultiWorldCanvas event-based rectangle tools
//# 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 DISPLAY_MULTIPVTOOL_H_
#define DISPLAY_MULTIPVTOOL_H_

#include <list>
#include <casa/aips.h>
#include <display/DisplayEvents/RegionTool.h>
#include <display/DisplayEvents/DTVisible.h>
#include <display/region/RegionCreator.h>
#include <display/region/RegionSourceFactory.h>


namespace casa { //# NAMESPACE CASA - BEGIN

        namespace viewer {
                class QtRegionDock;
        }

// <summary>
// Base class for MultiWorldCanvas event-based rectangle tools
// </summary>
//
// <use visibility=export>
//
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
//
// <prerequisites>
//   <li> WCTool
// </prerequisites>
//
// <etymology>
// MultiPVTool stands for MultiWorldCanvas PVLine Tool
// </etymology>
//
// <synopsis>
// This class adds to its base WCTool to provide a tool for drawing,
// resizing and moving rectangles on a WorldCanvas.  While MultiPVTool
// is not abstract, it performs no useful function.  The programmer
// should derive from this class, and implement the functions
// doubleInside and doubleOutside, which are called when the user
// double-clicks the key or mouse button inside or outside an existing
// rectangle respectively.  It is up to the programmer to decide what
// double clicks inside and outside the rectangle correspond to,
// although it is recommended that a double click inside correspond to
// the main action of the tool, and a double click outside correspond
// to a secondary action of the tool, if indeed a secondary action
// exists.
//
// The rectangle is drawn by dragging the mouse from one corner to 
// the diagonally opposite corner.  Once constructed, the rectangle
// can be resized by dragging its corners, or relocated by dragging
// inside the rectangle.  The rectangle is removed from the display 
// when the Esc key is pressed.
// </synopsis>
//
// <example>
// </example>
//
// <motivation>
// Many activities on the WorldCanvas will be based on the user drawing 
// a rectangle, and then proceeding to some action with that rectangle.
// A nice example is zooming.
// </motivation>

    class MultiPVTool : public RegionTool, public DTVisible, public viewer::RegionCreator {
  
        public:
  
            // Constructor
            MultiPVTool( viewer::RegionSourceFactory *rsf, PanelDisplay* pd,
                           Display::KeySym keysym = Display::K_Pointer_Button1, const Bool persistent = False );
  
            // Destructor
            virtual ~MultiPVTool();
  
            // Switch the tool off - this erases the rectangle, if any,
            // and calls the base class disable.
            virtual void disable();

            // reset to non-existent, non-active rectangle.
            // Refreshes if necessary to erase (unless skipRefresh==True  In
            // that case, the caller should do the refresh itself).
            // (Does not unregister from WCs or disable future event handling).
            virtual void reset(Bool skipRefresh=False);
  
            // Is a rectangle currently defined?
            virtual Bool rectangleDefined() { return itsPVLineExists;  } 
 
            viewer::RegionSource *getRegionSource( ) { return rfactory; }

            void checkPoint( WorldCanvas *wc, State &state );

            // called when the user (read GUI user) indicates that a region should be deleted...
            void revokeRegion( viewer::Region * );

            // returns a set which indicates regions this creator creates...
            const std::set<viewer::region::RegionTypes> &regionsCreated( ) const;

            bool create( viewer::region::RegionTypes /*region_type*/, WorldCanvas */*wc*/, const std::vector<std::pair<double,double> > &/*pts*/,
                         const std::string &/*label*/, viewer::region::TextPosition /*label_pos*/, const std::vector<int> &/*label_off*/,
                         const std::string &/*font*/, int /*font_size*/, int /*font_style*/, const std::string &/*font_color*/,
                         const std::string &/*line_color*/, viewer::region::LineStyle /*line_style*/, unsigned int /*line_width*/,
                         bool /*annotation*/, VOID */*region_specific_state*/ );

            RegionToolTypes type( ) const { return PVLINETOOL; }

        protected:

            // Functions called by the base class event handling operators--and
            // normally only those.  This is the input that controls the rectangle's
            // appearance and action.  When the rectangle is ready and double-click
            // is received, the doubleInside/Outside routine will be invoked.
            // <group>
            virtual void keyPressed(const WCPositionEvent &ev);
            virtual void keyReleased(const WCPositionEvent &ev);
            virtual void otherKeyPressed(const WCPositionEvent &ev);
            virtual void moved(const WCMotionEvent &ev, const viewer::region::region_list_type & /*selected_regions*/);
            // </group>

            // draw the rectangle (if any) on the object's currently active WC.
            // Only to be called by the base class refresh event handler.  Derived
            // objects should use refresh() if they need to redraw, but even that
            // is normally handled automatically.
            virtual void draw(const WCRefreshEvent&/*ev*/, const viewer::region::region_list_type & /*selected_regions*/);

            // Output callback functions--to be overridden in derived class.
            // Called when there is a double click inside/outside the rectangle
            // <group>
            virtual void doubleInside() { };
            virtual void doubleOutside() { };
            // </group>

            // Called when a rectangle is ready and not being 
            // edited.  (Unused so far on the glish level (12/01)).
            virtual void rectangleReady() { };


            // Retrieve the rectangle coordinates, in screen pixels.
            // Anchor (if applicable) is (x1,y1).  Valid during the output callbacks;
            // to be used by them, as well as internally.
            virtual void get(Int &x1, Int &y1, Int &x2, Int &y2) const ;

                virtual bool checkType( viewer::region::RegionTypes t ) { return t == viewer::region::PVLineRegion; }
            virtual std::tr1::shared_ptr<viewer::PVLine> allocate_region( WorldCanvas *wc, double x1, double y1, double x2, double y2, VOID *region_specific_state ) const;


            viewer::RegionSource *rfactory;

        private:
            typedef std::list<std::tr1::shared_ptr<viewer::PVLine> > pvlinelist;

            void update_stats(const WCMotionEvent &ev);
            void start_new_rectangle( WorldCanvas *, int x, int y );

            // set the pixel coordinates of the rectangle
            virtual void set(const Int &x1, const Int &y1, const Int &x2, const Int &y2);

            // get only the anchor point
            virtual void get(Int &x1, Int &y1) const;

            // do we have a rectangle yet? (if True, itsCurrentWC, itsEmitted, P1, and P2 are valid)
            Bool itsPVLineExists;

            // was the button pressed in the rectangle (or, if none, in an active WC)
            // and not yet released/reset?
            Bool itsActive;
            // itsActive is being replaced by resizing_region
            std::tr1::shared_ptr<viewer::PVLine> resizing_region;
            std::tr1::shared_ptr<viewer::PVLine> creating_region;
            int resizing_region_handle;

            // (valid only if itsActive==True):
            // True = being moved     False = being resized
            Bool itsMoving;
            // itsMoving is being replaced by moving_regions
            pvlinelist moving_regions;
            double moving_linx_;
            double moving_liny_;

            // (valid only if itsPVLineExists==True)
            // Has doubleInside/Outside been called for this rectangle?  If so, a
            // key press outside the rectangle will start a new rectangle, as if
            // itsPVLineExists were False.
            // However, a key press inside the rectangle will reset
            // itsEmitted to False, allowing the rectangle to be reused
            // (possibly moved or resized, and emitted again).
            Bool itsEmitted;

            // (Linear) coordinates of the rectangle (invariant over zooms, but not
            // coordinate system changes.  To do: support the WorldCoordinateChange
            // refresh reason, and reset this tool when it occurs).
            Vector<Double> itsP1, itsP2;

            // storage of the handle (pixel) coordinates
            Vector<Int> itsHX, itsHY;

            // position that move started from
            Int itsBaseMoveX, itsBaseMoveY;

            // store the times of the last two presses here:
            Double itsLastPressTime, its2ndLastPressTime;

            pvlinelist rectangles;
            PanelDisplay *pd_;

    };

} //# NAMESPACE CASA - END

#endif