On 24 Apr 2001, Havoc Pennington wrote:
>
> Jose Fernando Diago <[EMAIL PROTECTED]> writes:
> > You mean that I should offset the drawing coordinates like this:
> >
> > gdk_draw_line(GTK_LAYOUT(widget)->bin_window, widget->style->black_gc, xini, yini,
>xfin + layout->xoffset, yfin + layout->yoffset);
> >
>
> xoffset/yoffset are the position of the bin_window in the logical
> coordinate space of the entire scrollable area (i.e. the area defined
> by gtk_layout_set_size()).
Ok, I understand that. But I'm just wondering: what makes the xoffset and
yoffset to change it's value? From what I cant tell from my experience it
changes everytime I put or move something in the layout (am I right?) but
that's not a real explanation, is just an event that changes those
values.
>
> So say you want to have a line at (100, 100) in the large coordinate
> space (scrollable area). If xoffset, yoffset is currently (10, 10),
> then the bin_window is at 10,10 in the scrollable area. So you have to
> draw to (90,90) in the bin window. i.e. subtract the x/y offset from
> the logical coordinates.
>
> You need to offset both the start and end of the line (xini, yini as
> well as xfin, yfin).
>
> Havoc
>
Jose.
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