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tweak rectangle bounding box computation

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This commit is contained in:
Paul Davis 2014-01-08 10:42:14 -05:00
parent 35d3a4a351
commit cf293d0593
1 changed files with 13 additions and 5 deletions
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18
libs/canvas/rectangle.cc
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@ -119,11 +119,19 @@ Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) con
void
Rectangle::compute_bounding_box () const
{
/* boundary is drawn inside our coordinates but expanded by 0.5 to get
* single-pixel drawing correct.
*/
Rect r = _rect.fix();
_bounding_box = boost::optional<Rect> (r.expand (_outline_width/2.0));
if (!_rect.empty()) {
Rect r = _rect.fix ();
/* our outlines are always inside our coordinates, but we have
* to ensure that our bounding box fully *contains* the
* rectangle
*
* XXX: or something like that, waffle.
*
*/
_bounding_box = r.expand (1.0);
}
_bounding_box_dirty = false;
}