Re: GdkGC question

[Havoc Pennington <hp redhat com>]

Tom Aziz <tomazi caramail com> writes:
> I don't succed to draw lines of different colors (and 
> style).
> I need some help but it seems that nobody uses GDK drawing 
> features, and that there is no tutorial about this. It's 
> very sad because I want to use GDK for this, but if I can't 
> I will have to use another lib or another programming 
> langage with more documentation.

See the "scribble" example in the tutorial, and reference material in
the GDK chapter of http://developer.gnome.org/doc/GGAD/

> void
> drawing_init(GtkWidget *widget, gpointer data)
> {
>  lines1_GC = gdk_gc_new(widget->window);
>  lines2_GC = gdk_gc_new(widget->window);
>
>  color1 = g_new(GdkColor, 1);
>  color1->red = (gushort)(65535 * 1.00);
>  color1->green = (gushort)(65535 * 0.50);
>  color1->blue = (gushort)(65535 * 0.50);

here you have to allocate the color, using 
gdk_colormap_alloc_color (gtk_widget_get_colormap (widget), color1)

>  gdk_gc_set_foreground(lines1_GC, color1);
> /* same with color2 and lines2 */
> }

For line styles, you can change width and dashes and join style, etc.,
covered in doc/GGAD/

Havoc