<div dir="ltr">The tricks of cairo. The save/restore worked fine. Thanks for the help. </div><div class="gmail_extra"> <div class="gmail_quote">On Sat, Feb 6, 2016 at 12:10 AM, Uli Schlachter <<a href="mailto:psychon@znc.in" target="_blank">psychon@znc.in</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Am 06.02.2016 um 06:15 schrieb Mark Olesen: > Is cairo_in_fill supposed to work with rotation? > The following code gets hits on the un-rotated rectangle. > It's like the rotation is ignored. Thanks in advance. > [...] > cairo_new_path(cr); > cairo_rotate(cr, 45.0); // ROTATION SEEMS TO BE IGNORED > cairo_rectangle(cr, 0.0, 0.0, 100.0, 100.0); > > // only gets hits on un-rotated rectangle > l_hit = cairo_in_fill(cr, (*event).x, (*event).y); > printf("rect hit=%d %lf %lf\n", l_hit, (*event).x, (*event).y); > > cairo_destroy(cr); > > return 1; > } [...] cairo_in_fill() gets a point in user coordinates. That means that the point is rotated, too, before the hit test. Either undo the rotation with cairo_rectangle(cr, -45.0) (what a weird angle....) or via: cairo_save(cr); cairo_rotate(cr, 45); cairo_rectangle(cr, 0, 0, 100, 100); cairo_restore(cr); l_hit = cairo_in_fill(cr, x, y); Cheers, Uli -- - Captain, I think I should tell you I've never actually landed a starship before. - That's all right, Lieutenant, neither have I. </blockquote></div> </div>