221 lines
6.1 KiB
C
221 lines
6.1 KiB
C
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// Copyright (c) 1997-2000 Max-Planck-Institute Saarbruecken (Germany).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Nef_2/include/CGAL/sweep_observer.h $
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// $Id: sweep_observer.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Michael Seel <seel@mpi-sb.mpg.de>
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#ifndef CGAL_SWEEP_OBSERVER_H
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#define CGAL_SWEEP_OBSERVER_H
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#include <CGAL/license/Nef_2.h>
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#include <list>
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namespace CGAL {
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// TR is traits
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template <typename TR>
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class client_base
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{
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public:
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virtual void call(TR) const = 0;
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virtual ~client_base() {}
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};
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template <typename TR>
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class Event_hook
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{
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typedef client_base<TR>* p_client_base;
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typedef std::list< p_client_base > clientlist;
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protected:
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clientlist clients;
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public:
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Event_hook() : clients() {}
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~Event_hook() {
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while ( !clients.empty() ) {
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delete (*clients.begin());
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clients.pop_front();
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}
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}
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void operator()(TR t) const
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{ if ( clients.empty() ) return;
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for ( typename clientlist::const_iterator it=clients.begin();
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it != clients.end(); ++it )
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(*it)->call(t);
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}
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void attach(p_client_base psb)
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{ clients.push_back(psb); }
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};
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// TR is traits, OBS is observer
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template <class OBS, class TR>
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class client : public client_base<TR>
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{
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protected:
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OBS& obs_ref;
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void (OBS::* p_fnc)(TR);
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// pointer to member of Observer which works on an object of type TR
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public:
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client( OBS& obs, void (OBS::* p_fnc_init)(TR) ) :
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obs_ref(obs), p_fnc(p_fnc_init) {}
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void call(TR t) const
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{ (obs_ref.*p_fnc)(t); }
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};
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template <class OBS, class TR>
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inline void attach(Event_hook<TR>& h,
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OBS& obs, void (OBS::* p_fct)(TR t))
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{
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client<OBS,TR>* ps = new client<OBS,TR>(obs,p_fct);
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h.attach( (client_base<TR>*) ps);
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}
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/*{\Moptions outfile=sweep_observer.man}*/
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/*{\Manpage {sweep_observer}{GPS,VT}
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{Observing the plane sweep class}{Obs}}*/
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/*{\Mdefinition The data type |\Mname| provides an observer approach
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to the visualization of a sweep algorithm realized by |GPS =
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generic_sweep<T>| by means of an event mechanism. It allows to
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connect the events of an instance of |GPS| to the visualization
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operations provided by the traits class |VT|.}*/
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template <class GPS, class VT>
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class sweep_observer {
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VT vt;
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typedef typename GPS::TRAITS GPSTRAITS;
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typedef typename VT::VDEVICE VDEVICE;
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void post_init_animation(GPSTRAITS& gpst)
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{ vt.post_init_animation(gpst); }
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void pre_event_animation(GPSTRAITS& gpst)
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{ vt.pre_event_animation(gpst); }
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void post_event_animation(GPSTRAITS& gpst)
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{ vt.post_event_animation(gpst); }
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void post_completion_animation(GPSTRAITS& gpst)
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{ vt.post_completion_animation(gpst); }
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public :
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/*{\Mcreation 3cm}*/
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sweep_observer() : vt() {}
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/*{\Mcreate creates an object of type |VT| which can support a
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visualization device to visualize a sweep object of type |GPS|.}*/
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sweep_observer(GPS& gps);
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/*{\Mcreate creates an object of type |VT| which can support a
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visualization device to visualize a sweep object of type |GPS|
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and makes it an observer of |gps|.}*/
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/*{\Moperations 2cm 2cm}*/
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void attach(GPS& gps);
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/*{\Mop makes |\Mvar| an observer of |gps|.}*/
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VDEVICE& device()
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{ return vt.device(); }
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};
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/*{\Mexample
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A typical sweep observation based on |\Mname| looks like the following
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little program:
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\begin{Mverb}
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typedef generic_sweep<triang_sweep_traits> triang_sweep;
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triang_sweep Ts(...);
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sweep_observer< triang_sweep,
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cgal_window_stream_ts_visualization > Obs(Ts);
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Ts.sweep();
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\end{Mverb}
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This would visualize the sweep actions in the observer window by means
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of the visualization functions provided in
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|cgal_\-window_\-stream_\-ts_\-visualization|
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}*/
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template <class GPS, class VT>
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sweep_observer<GPS,VT>::
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sweep_observer(GPS& gps) : vt() { attach(gps); }
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template <class GPS, class VT>
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void
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sweep_observer<GPS,VT>::attach(GPS& gps)
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{
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CGAL::attach(gps.post_init_hook, *this,
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&sweep_observer::post_init_animation);
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CGAL::attach(gps.pre_event_hook, *this,
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&sweep_observer::pre_event_animation);
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CGAL::attach(gps.post_event_hook, *this,
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&sweep_observer::post_event_animation);
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CGAL::attach(gps.post_completion_hook, *this,
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&sweep_observer::post_completion_animation);
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}
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#ifdef THIS_IS_JUST_A_CONCEPT_DEFINITION
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/*{\Moptions outfile=vgps_concept.man}*/
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/*{\Manpage {GPS_visualization_concept}{}
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{Visualization of the generic plane sweep}{C}}*/
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class GPS_visualization_concept {
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/*{\Mdefinition |\Mtype| is the concept for the second template
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parameter |VT| of the sweep observer |sweep_observer<GPS,VT>| defined
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above. It provides the interface to adapt the sweep observation
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process to a visualization device. }*/
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/*{\Mtypes 5}*/
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typedef some_visualization_device VDEVICE;
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/*{\Mtypemember the visualization device}*/
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/*{\Mcreation 3}*/
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GPS_visualization_concept();
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/*{\Mcreate can be used to initialize and display the visualization
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device.}*/
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/*{\Moperations}*/
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void post_init_animation(GPS::TRAITS& gpst)
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/*{\Mop animation actions after the initialization of the sweep.}*/
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void pre_event_animation(GPS::TRAITS& gpst)
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/*{\Mop animation actions before each event handling.}*/
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void post_event_animation(GPS::TRAITS& gpst)
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/*{\Mop animation actions after each event handling.}*/
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void post_completion_animation(GPS::TRAITS& gpst)
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/*{\Mop animation actions after the completion phase of the sweep.}*/
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VDEVICE& device()
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/*{\Mop access operation to the visualization device.}*/
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/*{\Mtext Note that the entry point for visualization of the sweep
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is the access to an object |gpst| of type |GPS::TRAITS|. This is the
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sweep traits class triggering the sweep within the generic sweep
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framework and storing all status information of the sweep. Thereby it
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contains also all information necessary for visualization. |\Mvar|
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obtains access to this object at defined event points and can thereby
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analyze the status of |gpst| and trigger corresponding visualization
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actions via its visualization methods.}*/
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};
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#endif // THIS_IS_JUST_A_CONCEPT_DEFINITION
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} // namespace CGAL
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#endif // CGAL_SWEEP_OBSERVER_H
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