MultiPolylineTool.h

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//# 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
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//# $Id$

#ifndef DISPLAY_MULTIPOLYLINETOOL_H
#define DISPLAY_MULTIPOLYLINETOOL_H

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

namespace casa { //# NAMESPACE CASA - BEGIN

// <summary>
// Base class for WorldCanvas event-based polyline tools
// </summary>
//
// <use visibility=export>
//
// <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
// </reviewed>
//
// <prerequisites>
//   <li><linkto>WCTool</linkto>
// </prerequisites>
//
// <etymology>
// MultiPolylineTool stands for Multi-WorldCanvas Polyline Tool
// </etymology>
//
// <synopsis>
// This class adds to its base MWCTool to provide a tool for drawing,
// reshaping and moving polylines on a WorldCanvas.  While MultiPolylineTool
// is not abstract, it performs no useful function.  The programmer
// should derive from this class and override the functions doubleInside
// and doubleOutside at the very least.  These are called when the user
// double-clicks a particular key or mouse button inside or outside an
// existing polyline respectively.  It is up to the programmer to decide
// what these events mean, but it is recommended that an internal double-
// click correspond to the main action of the tool, eg. emitting the
// polyline vertices to the application, and that an external double-click
// correspond to a secondary action of the tool, if indeed there are
// additional actions suitable to the tool.
//
// The polyline is drawn by clicking at each of the vertices, and
// clicking again on the last or first vertex to complete the polyline.
// Once drawn, the vertices can be moved by dragging their handles,
// and the entire polyline relocated by dragging inside the polyline.
// The polyline is removed from the display when the Esc key is
// pressed.
// </synopsis>
//
// <example>
// </example>
//



        class MultiPolylineTool : public RegionTool, public DTVisible, public viewer::RegionCreator {

        public:

                // Constructor
                MultiPolylineTool( viewer::RegionSourceFactory *rsf, PanelDisplay* pd,
                                   Display::KeySym keysym = Display::K_Pointer_Button1, const casacore::Bool persistent = false );

                // Destructor
                virtual ~MultiPolylineTool();

                // Switch the tool off - this calls the base class disable,
                // and then erases the polyline if it's around
                virtual void disable();

                // reset to non-existent, non-active polyline.
                // Refreshes if necessary to erase (unless skipRefresh==true).
                // (Does not unregister from WCs or disable future event handling).
                virtual void reset(casacore::Bool skipRefresh=false);

                // Is a polyline currently defined?
                virtual casacore::Bool polylineDefined() {
                        return itsMode>=Ready;
                }

                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 POLYLINETOOL;
                }

        protected:

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

                // draw the polyline (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 by this class.
                virtual void draw(const WCRefreshEvent&/*ev*/, const viewer::region::region_list_type & /*selected_regions*/);

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

                // casacore::Function called when a polyline is ready and not being
                // edited.  (Unused so far on the glish level (12/01)).
                virtual void polylineReady() { };

                // Retrieve polyline vertices, or a single vertex, in screen pixels.
                // Valid results during the callback functions; to be used by them,
                // as well as internally.
                // <group>
                virtual void get(casacore::Vector<casacore::Int> &x, casacore::Vector<casacore::Int> &y) const;
                virtual void get(casacore::Int &x, casacore::Int &y, const casacore::Int pt) const;
                // </group>

                virtual bool checkType( viewer::region::RegionTypes t ) {
                        return t == viewer::region::PolylineRegion;
                }

        private:
                typedef std::list<std::shared_ptr<viewer::Polyline> > polylinelist;
                void start_new_polyline( WorldCanvas *, int x, int y );

                // Set the polyline vertices. itsNPoints should already be set, and
                // x and y must contain (at least) this many points.
                virtual void set(const casacore::Vector<casacore::Int> &x, const casacore::Vector<casacore::Int> &y);

                // replace a single vertex.
                virtual void set(const casacore::Int x, const casacore::Int y, const casacore::Int pt);

                std::shared_ptr<viewer::Polyline> resizing_region;
                std::shared_ptr<viewer::Polyline> creating_region;

                // push/pop last vertex
                // <group>
                void pushPoint(casacore::Int x1, casacore::Int y1);
                void popPoint();
                // </group>

                // are we inside the polyline?
                casacore::Bool inPolyline(const casacore::Int &x, const casacore::Int &y) const;

                // are we within the specified handle?
                casacore::Bool inHandle(const casacore::Int &pt, const casacore::Int &x, const casacore::Int &y) const;


                // should the polyline remain on screen after double clicks?
                casacore::Bool itsPolylinePersistent;

                // state of the polyline tool
                enum AdjustMode {
                    Off,        // Nothing exists yet
                    Def,        // defining initial polyline
                    Ready,      // polyline finished, no current activity
                    Move,       // moving entire polyline
                    Resize
                };      // moving single vertex whose handle was pressed
                MultiPolylineTool::AdjustMode itsMode;

                // set true on double-click, if the polyline is persistent.
                // set false when the polyline is moved, resized or reset.
                // If true, a click outside the polyline will erase it and begin
                // definition of a new one.
                casacore::Bool itsEmitted;

                // Number of points
                casacore::Int itsNPoints;

                // Polyline points (linear).  Not to be used directly.
                // use get, set, push, pop instead, which take pixel coordinate arguments.
                // It's done this way so that zooms work on the figures.
                casacore::Vector<casacore::Double> itsX, itsY;
                // pixel coordinates of the pan vector.  1 = anchor, 2 = new position.
                casacore::Int itsX1, itsY1, itsX2, itsY2, itsX3, itsY3;


                // size in pixels of the handles
                casacore::Int itsHandleSize;

                // vertex being moved
                casacore::Int itsSelectedHandle;

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

                // may not be needed...
                int resizing_region_handle;

                polylinelist moving_regions;
                double moving_linx_;
                double moving_liny_;

                std::shared_ptr<viewer::Polyline> building_polyline;
                viewer::RegionSource *rfactory;
                polylinelist polylines;
                PanelDisplay *pd_;
        };

} //# NAMESPACE CASA - END

#endif