ardour/livetrax
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Fix lineset drawing for lines > 1px width

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This is a follow up to 248e37ac0c.

A line at 0 with 1px width should draw from 0.5 to 1.5
(cairo pixel offset). The same line with a width of 3px
is -0.5 to 2.5.

The self.intersection code calculates this correctly, subtracting
shift, the drawing code however incorrectly added it.

This fixes MIDI track grid/note offset as well as a bleed
below the track.
This commit is contained in:
Robin Gareus 2023-07-17 05:05:20 +02:00
parent 8a371bcaa2
commit f08299ea1e
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 5 additions and 5 deletions
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10
libs/canvas/line_set.cc
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@ -101,7 +101,7 @@ LineSet::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
for (auto const & l : _lines) {
Rect self;
const double shift = l.width * 0.5;
const double shift = l.width * 0.5 - 1;
if (_orientation == Horizontal) {
self = Rect (0, l.pos - (l.width/2.0), _extent, l.pos + (l.width/2.0));
@ -135,12 +135,12 @@ LineSet::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
if (_orientation == Horizontal) {
const double y = item_to_window (Duple (0, l.pos)).y;
context->move_to (intersection.x0, y + shift);
context->line_to (intersection.x1, y + shift);
context->move_to (intersection.x0, y - shift);
context->line_to (intersection.x1, y - shift);
} else {
const double x = item_to_window (Duple (l.pos, 0)).x;
context->move_to (x + shift, intersection.y0);
context->line_to (x + shift, intersection.y1);
context->move_to (x - shift, intersection.y0);
context->line_to (x - shift, intersection.y1);
}
context->stroke ();