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Problem solve.

The main issue here is mixing GTK2.0 and GTK3.0, a few changes had to be made on this code.

1º Here we read "draw" we must have "expose-event"

2º the arguments of do_drawing not have cairo_t *cr but GdKEventExpose *event

3º create in the do_drawing the next 2 lines:

cairo_t *cr; cr = gdk_cairo_create(widget->window);

These solved the entire problem.

Thanks.

Problem solve.

The main issue here is mixing GTK2.0 and GTK3.0, a few changes had to be made on this code.

1º Here we read "draw" we must have "expose-event"

2º the arguments of do_drawing not have cairo_t *cr but GdKEventExpose *event

3º create in the do_drawing the next 2 lines:

cairo_t *cr;
cr = gdk_cairo_create(widget->window);
gdk_cairo_create(widget->window);