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feat: ellipse arc endpoint snap and LWPolyline arc midpoint grips

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Partial ellipse arcs now populate key_vertices with both endpoints so
Endpoint snap works correctly. LWPolyline arc segments (bulge ≠ 0) get
a diamond grip at the arc midpoint; dragging it recomputes the segment
bulge via circumcircle of start/mid/end, giving interactive arc editing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-04-27 02:22:51 +03:00
commit 6fd740e38f
2 changed files with 114 additions and 5 deletions
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8
src/entities/ellipse.rs
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@ -96,11 +96,17 @@ fn to_truck(ell: &Ellipse) -> TruckEntity {
let v_start = builder::vertex(*ctrl_pts.first().unwrap());
let v_end = builder::vertex(*ctrl_pts.last().unwrap());
let edge = Edge::new(&v_start, &v_end, Curve::BSplineCurve(bspline));
let pt_start = ctrl_pts.first().unwrap();
let pt_end = ctrl_pts.last().unwrap();
let key_vertices = vec![
[pt_start.x as f32, pt_start.y as f32, pt_start.z as f32],
[pt_end.x as f32, pt_end.y as f32, pt_end.z as f32],
];
TruckEntity {
object: TruckObject::Curve(edge),
snap_pts: vec![(center_v3, SnapHint::Center)],
tangent_geoms: vec![],
key_vertices: vec![],
key_vertices,
}
}
}