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tweak canvas rect drawing to correctly place bottom edge of rectangle inside the bounds (cairo works in mysterious ways)

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This commit is contained in:
Paul Davis 2014-02-25 11:35:00 -05:00
parent d81caf0680
commit 737aae908a
1 changed files with 2 additions and 8 deletions
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10
libs/canvas/rectangle.cc
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@ -97,16 +97,10 @@ Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) con
context->line_to (self.x1, self.y0 + 0.5);
}
/* in theory, you'd expect us to adjust these two by
* MINUS 0.5 pixels. But the way that Cairo apparently
* does rounding can lead that approach to draw on the
* wrong pixel coordinate. So we add 0.5 even here.
*/
if (_outline_what & BOTTOM) {
/* horizontal line: move y-coordinate by 0.5 pixels */
context->move_to (self.x0, self.y1 + 0.5);
context->line_to (self.x1, self.y1 + 0.5);
context->move_to (self.x0, self.y1 - 0.5);
context->line_to (self.x1, self.y1 - 0.5);
}
if (_outline_what & RIGHT) {