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drawing_area.cpp

Exemple d'utilisation des gtk_drawing_area

#define USE_NAMESPACE

#include <iostream>
#include <gtk++/gtkwindows.hpp>
#include <gtk++/gtkdrawingareas.hpp>
#include <gtk++/gdkwindows.hpp>

bool Dessine (GtkWidget* ZoneDessin, GdkEventExpose *Ev, lgtkpp::gtk_drawing_area* This)
{
  int i;
  lgtkpp::gdk_color Color;

  // La fenetre de dessin
  lgtkpp::gdk_window Window ((*(lgtkpp::gtk_widget*)This)->window);

  // On recupere la colormap de la zone de dessin
  lgtkpp::gdk_colormap Colormap = Window.GetColormap ();

  // On rend le fond de la fenetre blanc 
  Color = "white";
  Colormap.Alloc(Color);
  Window.SetBackground(Color);
  
  // On recupere le Gc par defaut
  lgtkpp::gdk_gc Gc = (Window.GetDrawable());

  // On alloue la couleur bleue pour le dessin
  Color.SetRed(0).SetGreen(0).SetBlue(65535);  
  Colormap.Alloc(Color);
  Gc.SetForeground(Color);
  Window.Clear();
  // Ligne de la zone de dessin 
  for (i=0; i < (*(lgtkpp::gtk_widget*)This)->allocation.width; i += 5)
    Window.Line(Gc, i, 0, (*(lgtkpp::gtk_widget*)This)->allocation.width - i,(*(lgtkpp::gtk_widget*)This)->allocation.height);
  for (i=0; i < (*(lgtkpp::gtk_widget*)This)->allocation.height; i += 5)
    Window.Line(Gc, 0, (*(lgtkpp::gtk_widget*)This)->allocation.height - i,(*(lgtkpp::gtk_widget*)This)->allocation.width, i);
    
  return true;
}

int main (int argc, char * argv[])
{

  // Initialisation des bibliotheques
  ::gtk_init(&argc, &argv);

  // Creation de la fenetre
  lgtkpp::gtk_window Fenetre;
  Fenetre.SetTitle ("Test Drawing Area");
  Fenetre.SignalConnect ("delete_event",GtkSignalFunc(gtk_exit), NULL);
  Fenetre.SignalConnect ("destroy",GtkSignalFunc(gtk_exit), NULL);

  // Creation et attachement de la zone de dessin
  lgtkpp::gtk_drawing_area ZoneDessin;
  Fenetre += ZoneDessin;
  ZoneDessin.SignalConnect("expose_event",GtkSignalFunc(Dessine), &ZoneDessin);

  // Affichage et boucle principale
  Fenetre.ShowAll();
  gtk_main();
  return EXIT_SUCCESS;
}

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