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feat(snap): mark the parallel reference line + toggle it off on re-hover

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Two refinements to Parallel snap. The acquired reference now keeps a
point on the line and draws a ∥ marker there, so the user sees which line
the parallel is measured from. And dwelling on that same reference line
again removes it (toggle), matching how OTRACK tracking points clear;
dwelling on a different line switches the reference. Same-line detection
uses parallel direction plus perpendicular screen distance, so it holds
across zoom.

Refs #277

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-07-05 14:50:33 +03:00
commit 3bcb5a04c5
4 changed files with 114 additions and 43 deletions
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10
src/app/view/mod.rs
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@ -386,6 +386,15 @@ impl OpenCADStudio {
}
_ => None,
};
// The acquired Parallel-snap reference, marked on its line (#277).
let parallel_ref_marker: Option<iced::Point> =
match (otrack_proj, self.snapper.parallel_ref) {
(Some((view_rot, eye, ob)), Some((_, pt))) => {
let s = ost_project(pt, view_rot, eye, ob);
(s.x.is_finite() && s.y.is_finite()).then_some(s)
}
_ => None,
};
// Model-space pane dividers (none in paper / single-pane layouts).
let dividers = if !is_paper {
@ -437,6 +446,7 @@ impl OpenCADStudio {
ucs_icons,
ost_points,
otrack_line,
parallel_ref_marker,
!is_paper && self.show_viewcube,
dividers,
pane_move_rect,