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slight code tidy for Line::render() ... don't use 0.5 pixel adjustment if the line width > 1.0

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This commit is contained in:
Paul Davis 2014-02-12 15:26:53 -05:00
parent e247103a7e
commit f5499d206a
1 changed files with 10 additions and 4 deletions
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14
libs/canvas/line.cc
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@ -60,11 +60,17 @@ Line::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) cons
Duple p0 = item_to_window (Duple (_points[0].x, _points[0].y));
Duple p1 = item_to_window (Duple (_points[1].x, _points[1].y));
/* See Cairo FAQ on single pixel lines to understand why we add 0.5
*/
if (_outline_width <= 1.0) {
/* See Cairo FAQ on single pixel lines to understand why we add 0.5
*/
const Duple half_a_pixel (0.5, 0.5);
p0 = p0.translate (half_a_pixel);
p1 = p1.translate (half_a_pixel);
}
context->move_to (p0.x + 0.5, p0.y + 0.5);
context->line_to (p1.x + 0.5, p1.y + 0.5);
context->move_to (p0.x, p0.y);
context->line_to (p1.x, p1.y);
context->stroke ();
}