Getting window coordinates of a GnomeCanvasItem

[Marc Mulcahy <marc mulcahy sun com>]

I am about half way through implementing accessibility support on 
libgnomecanvas, such that an assistive technology could at least traverse 
the higherarky of canvas items and get useful information from 
GnomeCanvasRichText, GnomeCanvasText, GnomeCanvasPixbuf, and 
GnomeCanvasWidget items.

What is the appropriate way to get the window-based and screen-based 
geometry of a GnomeCanvasItem derivative.  the correct approach appears to be:

gdouble world_x1, world_y1, world_x2, world_y2;
gdouble win_x1, win_y1, win_x2, win_y2;
GnomeCanvasItem *item;
...
gnome_canvas_item_get_bounds (item,
	&world_x1, &world_y1,
	&world_x2, &world_y2);
gnome_canvas_world_to_window (item->canvas,
	world_x1, world_y1,
	&win_x1, &win_y1);
...

Am I even close?

Our accessibility API returns geometry information as gints-- can win_x1 
and win_y1 be safely cast to gints?

Thanks,

Marc