On Mon, 2008-05-26 at 22:45 +0200, J.M. Maurer wrote:
>
> On Mon, 2008-05-26 at 22:03 +0200, Robert Staudinger wrote:
> > On Mon, May 26, 2008 at 6:55 PM, J.M. Maurer <uwog@uwog.net> wrote:
> >
> > [...]
> >
> > > I don't think this is actually correct. If you do x1 + width = x2, then
> > > your x2 is 1 pixel too big. For example, left pos x1 = 0, width = 10,
> > > then x2 should be 9, not 10. So you need an additional -1. Same case for
> > > y2.
> > >
> > > We have this mistake all over the code. No need to spread it any
> > > further :)
> >
> > http://cairographics.org/FAQ/#sharp_lines
> >
> > It seems both of us are not quite correct.
>
> That example is weird too:
>
> cairo_move_to (cr, 10, 10);
> cairo_line_to (cr, 20, 10);
> cairo_set_line_width (cr, 1);
> cairo_stroke (cr);
>
> The user expects 10 pixels in one row to be affected,
>
> I would expect 11 pixels to be affected (10-19 would be 10 pixels).
If course ignore the vertical 'affection' of 2 pixels, which is
explained in your link, and makes sense.
Marc
Received on Mon May 26 22:58:31 2008
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