[Glade-users] a question about GtkImage

[Tristan Van Berkom]

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

> Hello,
>    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.

Cheers,
                        -Tristan
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