[cairo] cairo_in_fill w/rotate?
psychon at znc.in
Sat Feb 6 08:10:25 CET 2016
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_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);
> 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_rectangle(cr, 0, 0, 100, 100);
l_hit = cairo_in_fill(cr, x, y);
- Captain, I think I should tell you I've never
actually landed a starship before.
- That's all right, Lieutenant, neither have I.
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