Re: [gtk-list] newbie

[Eric Harlow <linuxgeek yahoo com>]

The problem is that while you say you don't want to use a pixmap and
copy it into the window, you're still drawing into the pixmap - not
the window.  This is why you don't see anything.  You should draw
directly into the window instead. 

 -Eric

---khosro@iglou.com wrote:
>
> 
> Hi all,
> 
> Newbie with a question:  I modified/simplified the example code,
provided
> with the gtk-tutorial.  My goal is to draw a simple window, in which 
> geometric figures are drawn sequentially, not stamped form a backing
pixmap. 
> Now, the window appears, but the line doesn't!  Can someone help me? 
> 
> TIA,
> 
> Khosro
> =================================================================
> here is the code:
> =================================================================
> 
> 
> /* GTK - The GIMP Toolkit
>  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh
MacDonald
>  *...
>  */
> 
> #include <gtk/gtk.h>
> 
> static GdkPixmap *pixmap = NULL;
> 
> void
> quit ()
> {
>   gtk_exit (0);
> }
> 
> int
> main (int argc, char *argv[])
> {
>   GtkWidget *window;
>   GtkWidget *drawing_area;
>   GtkWidget *vbox;
>   GtkWidget *widget;
>   GtkWidget *button;
> 
>   
>   gtk_init (&argc, &argv);
> 
>   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
> 
>   vbox = gtk_vbox_new (FALSE, 0);
>   gtk_container_add (GTK_CONTAINER (window), vbox);
> 
>   gtk_signal_connect (GTK_OBJECT (window), "destroy",
> 		      GTK_SIGNAL_FUNC (quit), NULL);
> 
>   /* Create the drawing area */
> 
>   drawing_area = gtk_drawing_area_new ();
>   gtk_drawing_area_size (GTK_DRAWING_AREA (drawing_area), 200, 200);
>   gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);
> 
>   
>   widget = drawing_area;
>   
>   pixmap = gdk_pixmap_new(widget->window,
> 			  widget->allocation.width,
> 			  widget->allocation.height,
> 			  -1);
>   
>   gdk_draw_rectangle (pixmap,
> 		      widget->style->white_gc,
> 		      TRUE,
> 		      0, 0,
> 		      widget->allocation.width,
> 		      widget->allocation.height);
> 
>   gdk_draw_line (pixmap,
>                  widget->style->black_gc,
>                  100, 50, 50, 100);               /** ??? ***/
> 
>   gdk_draw_pixmap(widget->window,
>                       widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
>                       pixmap,
>                       0,0,
>                       0,0,
>                       widget->allocation.width,
> 		      widget->allocation.height);
>       
> 
> 
>   /* .. And a quit button */
>   button = gtk_button_new_with_label ("Quit");
>   gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
> 
>   gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
> 			     GTK_SIGNAL_FUNC (gtk_widget_destroy),
> 			     GTK_OBJECT (window));
> 
>   
>   gtk_widget_show (drawing_area);
> 
>   gtk_widget_show (vbox);
> 
>   gtk_widget_show (button);
> 
>   gtk_widget_show (window);
> 
>   gtk_main ();
> 
>   return 0;
> }
> 
> 
> -- 
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/dev/null
> 
> 

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