demo3.c

CGAL is a collaborative effort of several sites in Europe and Israel. The goal is to make the most i

// ============================================================================
//
// Copyright (c) 1997-2003 The CGAL Consortium
// This software and related documentation are part of the Computational
// Geometry Algorithms Library (CGAL).
// This software and documentation are provided "as-is" and without warranty
// of any kind. In no event shall the CGAL Consortium be liable for any
// damage of any kind. 
// ----------------------------------------------------------------------
//
// file          : main.C
// package       : Qt_widget
// author(s)     : Radu Ursu
// coordinator   : Laurent Rineau
//
// email         : [e-mail]
// www           : http://www.cgal.org
//
// ======================================================================


// 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 "cgal_types3.h"

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


#include <CGAL/IO/Qt_widget.h>
#include <CGAL/IO/Qt_widget_Polygon_2.h>
#include "Qt_widget_toolbar3.h"
#include <CGAL/IO/Qt_widget_standard_toolbar.h>
#include <CGAL/IO/Qt_help_window.h>
#include <CGAL/IO/Qt_widget_layer.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>



const QString my_title_string("Arrangement Demo with"
			      " CGAL Qt_widget");

//global flags and variables
int                 current_state;
std::list<Curve>    list_of_segments;
std::list<Cgal_Polygon>  list_of_polygons;

Arr                 arr;
bool                pl_valid=false;
Point               pl_point;

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


  void draw()
  {
    widget->lock();

    *widget << CGAL::GREEN;
    *widget << CGAL::LineWidth(1);
    std::list<Cgal_Polygon>::iterator itp = list_of_polygons.begin();
    while(itp!=list_of_polygons.end()){
      Cgal_Polygon::Edge_const_iterator eci = (*itp).edges_begin();
      Cgal_Polygon::Edge_const_iterator last_edge=(*itp).edges_end();
      last_edge--;
      while(eci != last_edge )
      {
	*widget << (*eci++);
      }
      itp++;
    }


    if(pl_valid && !(arr.halfedges_begin() == arr.halfedges_end()) ) 
    {
      *widget << CGAL::LineWidth(3);
      *widget << CGAL::YELLOW;

      Arr::Locate_type lt;
      Arr::Point temp_p(pl_point.x(),pl_point.y());
      Arr::Halfedge_handle e = arr.locate(temp_p, lt);
//      std::cout << "locate type " << lt << std::endl;
	
      //color the face on the screen
      Arr::Face_handle f=e->face();

	
      if (f->does_outer_ccb_exist()) 
      {
	Arr::Ccb_halfedge_circulator cc=f->outer_ccb();
	do {
	  CGAL::Polyline_2<Seg_traits>::const_iterator points_iter;
	  for (points_iter = cc->curve().begin();
               points_iter != cc->curve().end(); ) 
	  {
	    CGAL::Polyline_2<Seg_traits>::const_iterator source_point =
              points_iter;
	    points_iter++;
    	    CGAL::Polyline_2<Seg_traits>::const_iterator target_point =
              points_iter;
    
	    if (target_point == cc->curve().end())
	      break;
    
	    Segment s(*source_point, *target_point);
	    *widget << s;
	  }
	} while (++cc != f->outer_ccb());
	
      }

      Arr::Holes_iterator hit=f->holes_begin(),eit=f->holes_end();
      for (;hit!=eit; ++hit) 
      {
	Arr::Ccb_halfedge_circulator cc=*hit; 
	do 
	{
	  CGAL::Polyline_2<Seg_traits>::const_iterator points_iter;
	  for (points_iter = cc->curve().begin();
               points_iter != cc->curve().end(); ) 
	  {
	    CGAL::Polyline_2<Seg_traits>::const_iterator source_point =
              points_iter;
	    points_iter++;
    	    CGAL::Polyline_2<Seg_traits>::const_iterator target_point =
              points_iter;
    
	    if (target_point == cc->curve().end())
	      break;
    
	    Segment s(*source_point, *target_point);
	    *widget << s;
	  }
	} while (++cc != *hit);
      }
      *widget << CGAL::LineWidth(1);
    }

    widget->unlock();
  };	

  void mousePressEvent(QMouseEvent *e)
  {
    if(e->button() == Qt::MidButton)
    {
      pl_valid = false;

      if( list_of_polygons.empty() )
	return;

      NT x=static_cast<NT>(widget->x_real(e->x()));
      NT y=static_cast<NT>(widget->y_real(e->y()));

      Point p(x,y);
      NT min_dist=100000000;
      std::list<Cgal_Polygon>::iterator it_closest=NULL;
      std::list<Cgal_Polygon>::iterator pit = list_of_polygons.begin();

      Segment closest_segment;

      while(pit!=list_of_polygons.end())
      {
	Cgal_Polygon::Edge_const_iterator eit = (*pit).edges_begin();
	Cgal_Polygon::Edge_const_iterator last_edge=(*pit).edges_end();
	last_edge--;
	while(eit != last_edge )
	{
	  NT dist = CGAL::squared_distance( p, (*eit));
	  if( dist < min_dist)
	  {
	    min_dist = dist;
	    it_closest = pit;
	    closest_segment = (*eit);
	  }
	  eit++;
	}
	pit++;
      }
      


      Arr::Curve_iterator ci = arr.curve_node_begin();
      while(ci != arr.curve_node_end() )
      {
	bool found=false;

	CGAL::Polyline_2<Seg_traits>::const_iterator points_iter;
	for (points_iter = ci->curve().begin();
             points_iter != ci->curve().end(); ) 
	{
	  CGAL::Polyline_2<Seg_traits>::const_iterator source_point =
            points_iter;
	  points_iter++;
	  CGAL::Polyline_2<Seg_traits>::const_iterator target_point =
            points_iter;
	    
	  if (target_point == ci->curve().end())
	    break;
	    
	  Segment s(*source_point, *target_point);
	  if(s == closest_segment)
	  {
	    arr.remove_curve(ci);
	    found=true;
	    break;
	  }
	}
	if(found)
	  break;

	ci++;
      }

      list_of_polygons.erase( it_closest );
//      list_of_covering.clear();
//      list_of_segments.clear();
      
      (*widget).redraw();
    }
  }; 
  
};//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 polylines", this,
				SLOT(gen_segments()), 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_segments);	
  
    *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_segments.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)
  {
    pl_valid = false;


    Cgal_Polygon pol;
    if(CGAL::assign(pol,obj))
    {
      list_of_polygons.push_back(pol);

      std::vector<Point> pts;

      Cgal_Polygon::Edge_const_iterator eci = pol.edges_begin();
      while(eci != pol.edges_end() )
      {
	Curve c= *eci++;
	Seg_traits ST;
	pts.push_back( ST.curve_source(c) );
      }

      Traits::Curve_2 pol( pts.begin(), pts.end() );
      arr.insert( pol );
      something_changed();
    }

    Point p;
    if(CGAL::assign(p,obj)) {

      pl_point = p;
      pl_valid = true;
      
      something_changed();
    }

  };

  void about()
  {
    QMessageBox::about( this, my_title_string,
		"This is a demo for the Arrangement package\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_segments()
  {
    stoolbar->clear_history();
    widget->set_window(-1.1, 1.1, -1.1, 1.1); 

    // send resizeEvent only on show.
    std::list<Point> list_of_points;
    CGAL::Random_points_in_square_2<Point> g(1);
    for(int count=0; count<5; count++) 
    {
      list_of_points.clear();
      for(int i=0; i<5; i++)
      {
	list_of_points.push_back(*g++);
      }
      CGAL::Polyline_2<Seg_traits> p(list_of_points.begin(),
                                     list_of_points.end() );

      Cgal_Polygon pol(list_of_points.begin(), list_of_points.end() );
      
      list_of_polygons.push_back(pol);

      arr.insert(p);
    }

    pl_valid = false;

    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 "demo3.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);
  widget.show();
  current_state = -1;
  return app.exec();
}

#endif // CGAL_USE_QT