// Copyright (c) 2002  ETH Zurich (Switzerland).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you may redistribute it under
// the terms of the Q Public License version 1.0.
// See the file LICENSE.QPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $Source: /CVSROOT/CGAL/Packages/Min_ellipse_2/demo/Min_ellipse_2/min_ellipse_2.C,v $
// $Revision: 1.4.4.1 $ $Date: 2004/12/19 15:38:06 $
// $Name:  $
//
// Author(s)     : Radu Ursu

// if QT is not installed, a message will be issued in runtime.
#ifndef CGAL_USE_QT
#include <iostream>


int main(int, char*)
{

  std::cout << "Sorry, this demo needs QT...";
  std::cout << std::endl;

  return 0;
}

#else

#include <fstream>
#include <stack>
#include <set>
#include <string>

#include <CGAL/basic.h>
#include <CGAL/Cartesian.h>
#include <CGAL/Min_ellipse_2.h>
#include <CGAL/Min_ellipse_2_traits_2.h>
#include <CGAL/point_generators_2.h>


#include <CGAL/IO/Qt_widget.h>
#include <CGAL/IO/Qt_widget_Optimisation_ellipse_2.h>
#include <CGAL/IO/Qt_widget_standard_toolbar.h>
#include <CGAL/IO/Qt_help_window.h>
#include <CGAL/IO/Qt_widget_layer.h>
#include <CGAL/IO/pixmaps/demoicon.xpm> 
#include "Qt_widget_toolbar.h"

#include <qplatinumstyle.h>
#include <qapplication.h>
#include <qmainwindow.h>
#include <qstatusbar.h>
#include <qfiledialog.h>
#include <qmessagebox.h>
#include <qpopupmenu.h>
#include <qmenubar.h>
#include <qtoolbutton.h>
#include <qtoolbar.h>
#include <qfiledialog.h>
#include <qtimer.h>

typedef double                          Coord_type;
typedef CGAL::Cartesian<Coord_type>     Rep;

typedef CGAL::Point_2<Rep>              Point_2;
typedef CGAL::Segment_2<Rep>            Segment;
typedef CGAL::Min_ellipse_2_traits_2< Rep >
                                        Traits;
typedef  CGAL::Min_ellipse_2< Traits >  Min_ellipse;



const QString my_title_string("Minimum ellipse Demo with"
			      " CGAL Qt_widget");

//global flags and variables
int current_state;
std::list<Point_2>	  list_of_points;


class Qt_layer_show_ch : public CGAL::Qt_widget_layer
{
public:
	
  Qt_layer_show_ch(){};


  void draw()
  {
    widget->lock();
    *widget << CGAL::PointSize(3);
    *widget << CGAL::GREEN;
    std::list<Point_2>::iterator itp = list_of_points.begin();
    while(itp!=list_of_points.end())
    {
      *widget << (*itp++);
    }
    *widget << CGAL::PointSize(2);// << CGAL::PointStyle(CGAL::PIXEL);
    *widget << CGAL::RED;
    Min_ellipse min_ell;
    min_ell.insert(list_of_points.begin(),list_of_points.end());
    *widget << min_ell.ellipse();

    widget->unlock();
  };	
  
};//end class 

class MyWindow : public QMainWindow
{
  Q_OBJECT
public:
  MyWindow(int w, int h){
    widget = new CGAL::Qt_widget(this);
    setCentralWidget(widget);
    
    //create a timer for checking if somthing changed
    QTimer *timer = new QTimer( this );
    connect( timer, SIGNAL(timeout()),
           this, SLOT(timer_done()) );
    timer->start( 200, FALSE );

    // file menu
    QPopupMenu * file = new QPopupMenu( this );
    menuBar()->insertItem( "&File", file );
    file->insertItem("&New", this, SLOT(new_instance()), CTRL+Key_N);
    file->insertItem("New &Window", this, SLOT(new_window()), CTRL+Key_W);
    file->insertSeparator();
    file->insertItem("Print", widget, SLOT(print_to_ps()), CTRL+Key_P);
    file->insertSeparator();
    file->insertItem( "&Close", this, SLOT(close()), CTRL+Key_X );
    file->insertItem( "&Quit", qApp, SLOT( closeAllWindows() ), CTRL+Key_Q );

    // drawing menu
    QPopupMenu * draw = new QPopupMenu( this );
    menuBar()->insertItem( "&Draw", draw );
    draw->insertItem("&Generate points", this,
				SLOT(gen_points()), CTRL+Key_G );

    // help menu
    QPopupMenu * help = new QPopupMenu( this );
    menuBar()->insertItem( "&Help", help );
    help->insertItem("How To", this, SLOT(howto()), Key_F1);
    help->insertSeparator();
    help->insertItem("&About", this, SLOT(about()), CTRL+Key_A );
    help->insertItem("About &Qt", this, SLOT(aboutQt()) );

    //the standard toolbar
    stoolbar = new CGAL::Qt_widget_standard_toolbar (widget, this, "ST");
    //the new tools toolbar
    newtoolbar = new Tools_toolbar(widget, this, &list_of_points);	
  
    *widget << CGAL::LineWidth(2) << CGAL::BackgroundColor (CGAL::BLACK);
  
    resize(w,h);
    widget->set_window(-1, 1, -1, 1);
    widget->setMouseTracking(TRUE);
	
    //connect the widget to the main function that receives the objects
    connect(widget, SIGNAL(new_cgal_object(CGAL::Object)), 
      this, SLOT(get_new_object(CGAL::Object)));

    //application flag stuff
    old_state = 0;

    //layers
    widget->attach(&testlayer);
  };

private:
  void something_changed(){current_state++;};
  
public slots:
  void new_instance()
  {
    widget->lock();
    list_of_points.clear();
    stoolbar->clear_history();
    widget->set_window(-1.1, 1.1, -1.1, 1.1);
		// set the Visible Area to the Interval
    widget->unlock();
    something_changed();
  }

private slots:
  void get_new_object(CGAL::Object obj)
  {
    Point_2 p;
    if(CGAL::assign(p,obj)) {
      list_of_points.push_back(p);
      something_changed();
    }
  };

  void about()
  {
    QMessageBox::about( this, my_title_string,
		"This is a demo for Minimum ellipse\n"
  		"Copyright CGAL @2003");
  };

  void aboutQt()
  {
    QMessageBox::aboutQt( this, my_title_string );
  }

  void howto(){
    QString home;
    home = "help/index.html";
    CGAL::Qt_help_window *help = new 
      CGAL::Qt_help_window(home, ".", 0, "help viewer");
    help->resize(400, 400);
    help->setCaption("Demo HowTo");
    help->show();
  }

  void new_window(){
    MyWindow *ed = new MyWindow(500, 500);
    ed->setCaption("Layer");
    ed->stoolbar->clear_history();
    ed->widget->set_window(-1.1, 1.1, -1.1, 1.1);
    ed->show();
    something_changed();
  }

  void timer_done()
  {
    if(old_state!=current_state){
      widget->redraw();
      old_state = current_state;
    }
  }	

  void gen_points()
  {
    stoolbar->clear_history();
    widget->set_window(-1.1, 1.1, -1.1, 1.1); 
		// set the Visible Area to the Interval

    // send resizeEvent only on show.
    CGAL::Random_points_in_disc_2<Point_2> g(1);
    for(int count=0; count<200; count++) {
      list_of_points.push_back(*g++);
    }
    something_changed();
  }
	
	

private:
  CGAL::Qt_widget        *widget;
  CGAL::Qt_widget_standard_toolbar
                         *stoolbar;
  Tools_toolbar          *newtoolbar;
  int                    old_state;
  Qt_layer_show_ch       testlayer;
};

#include "min_ellipse_2.moc"


int
main(int argc, char **argv)
{
  QApplication app( argc, argv );
  MyWindow widget(500,500); // physical window size
  app.setMainWidget(&widget);
  widget.setCaption(my_title_string);
  widget.setMouseTracking(TRUE);
#if !defined (__POWERPC__)
  QPixmap cgal_icon = QPixmap((const char**)demoicon_xpm);
  widget.setIcon(cgal_icon);
#endif
  widget.show();
  current_state = -1;
  return app.exec();
}

#endif // CGAL_USE_QT