CGAL users discussion list

[Mahmood Naderan <>]

Hi,
How can I create two independent QT window? Here is what I wrote:
in the main():
          QApplication app (argc, argv);
  
          myProgram *w = new myProgram (....);
          app.setMainWidget (w);
          w->show();
          return (app.exec());
In the constructor of myProgram class, I wrote:
         // Create first window. 
         widget = new CGAL::Qt_widget(this);
         widget->resize (INIT_WIDTH, INIT_HEIGHT);
         widget->set_window (x_min, x_max, y_min, y_max);
         connect(widget, SIGNAL(redraw_on_back()), this, SLOT(redraw_win()));
         connect(widget, SIGNAL(s_mousePressEvent(QMouseEvent*)), this, 
SLOT(mousePressEvent (QMouseEvent*)));
         setCentralWidget(widget);
         redraw_win();
         // create second window
         mWid = new CGAL::Qt_widget(this);
         mWid->resize (INIT_WIDTH, INIT_HEIGHT);
         mWid->set_window (x_min, x_max, y_min, y_max);
         connect(mWid, SIGNAL(redraw_on_back()), this, 
SLOT(redraw_winMahmood()));
         connect(mWid, SIGNAL(s_keyPressEvent(QKeyEvent*)),  this, 
SLOT(keyPressEvent(QKeyEvent*)));
         redraw_winMahmood();
functions for second window are:
        void keyPressEvent(QKeyEvent *e)
        {
            mWid->redraw();
        }
        void redraw_winMahmood()
        {    // based on CGAL manual
            typedef CGAL::Cartesian<int> Rep;
            typedef CGAL::Point_2<Rep> Point_2;
            typedef CGAL::Segment_2<Rep> Segment;
            mWid->resize(600, 600);
            mWid->set_window(0, 600, 0, 600);
            mWid->show();
            mWid->lock();
            *mWid << CGAL::BackgroundColor(CGAL::ORANGE) << CGAL::RED;
            *mWid << Segment(Point_2(100,100), Point_2(400,400));
            mWid->unlock();
        }
 
The first window functions are ok; I mean if I only have the first window, it 
works. The problem is when I add second window, after I press a key (because 
there should be a key event in order to create second window), strangly the 
first window closes!!!
What is wrong with it?

-------------------
Mahmood Naderan
http://ce.sharif.edu/~m_naderan



      
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