[Glade-users] a question about GtkImage

2008/1/16 wubei83 <wubei83 at 163.com>:

   I need some information about GtkImage .In my application, I attach a
GtkImage in the GtkTable which is attached in the top window. The program
is as follows:

     GtkWidget *image;
     image = create_pixmap (image,"sine.png");
     pix1 = gtk_image_get_pixbuf (GTK_IMAGE(image));
     pix2 = gdk_pixbuf_scale_simple(pix1, 205, 82, GDK_INTERP_BILINEAR);
     gtk_image_set_from_pixbuf (GTK_IMAGE(image), pix2);
     g_object_unref (pix2);
     gtk_widget_show (image);
     gtk_table_attach (GTK_TABLE(table), image, 3, 16, 0, 8,
     (GtkAttachOptions) (GTK_EXPAND | GTK_SHRINK | GTK_FILL),
    (GtkAttachOptions) (GTK_EXPAND | GTK_SHRINK | GTK_FILL), 0, 0);

    Now, I want to realize the function that when I click the button,
there will be a arrow displayed on the fixed pisition of the image. But I do
not know how to do.
    Any information is appreciated. Thanks.

Sure, you should probably be using a GtkDrawingArea widget, handle the
expose event and start by blitting on the background image (possibly from
a prefabricated GdkPixmap), and then using cairo drawing routines to
draw shapes and lines onto your drawing area.

I think the scribble example in the gtk+ sources should be a good start
for you.

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